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Lennox International Inc. DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE Furnace User Manual

1. EN NOTE Single EI venting with zero uos lengths are assumed to have no elbows in the vent system For all other vent configurations the vent system is assumed to have two 90 elbows For each additional 90 elbow or equivalent for example two 45 elbows equal one 90 elbow beyond two the maximum capacity listed in the venting table should be reduced by 10 percent 0 90 x maxi mum listed capacity Y 377 367 351 337 322 587 5 5 S d Bs sss a ae d Page 18 TABLE 4 Capacity of Type B Double Wall Vents with Single Wall Metal Connectors Serving a Single Category Appliance Vent and Connector Diameter D inches ee ana pese em 3 L feet Appliance Input Rating in Thousands of Btu Per Hour F Ce w u e e Los u j w u ee s s m s P J 791 195 191 958 s w s 7 r ww 38 z j a 58758 139 7 m J s s 0 p BEEN BE ao e ws ea 7 ww NR NOTE Single appliance venting ws zero God lengths are assumed to have no the vent system For all other
2. 2 Once the control receives a signal that the low pres c sure switch has closed the Combustion air dicor be When the thermostat heating demand is satisfied the gins a 15 second pre purge in low speed combustion air inducer begins a 5 second low speed NOTE If the low fire pressure switch does not close post purge The field selected indoor blower off delay the combustion air inducer will switch to high fire After dte The blower operates at the low fire a 15 second pre purge the high fire pressure switch vet NN IS will close and the unit will begin operation on high fire 7 When the combustion air post purge period is com After 10 to 20 seconds of high fire operation the unit plete the inducer the HUM contacts as well as the will switch to low fire 120V ACC terminals are de energized The indoor 3 After the pre purge is complete a 20 second initial ig blower is de energized at the end of the off delay nitor warm up period begins The combustion air in ducer continues to operate at low speed HEATING OPERATION WITH TWO STAGE THERMOSTAT ES 1 15 35 39 30 80 S SEC blower ON Pre Purge Trial For blower Post off OFF Ignitor Warm up Ignition on delay Purge delay 1 stg heat demand low speed CAI ignitor low fire gas valve indoor blower low heat 2 stg heat demand 30 seconds RECOGNITION PERIOD high speed CAI high fire gas valve indoor blower h
3. DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1300 1420 18 1250 1335 12 1185 1285 6 1145 1240 Factory Default 1070 1170 6 1015 1100 12 970 1035 18 880 980 COOLING 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm DIP Switch Settings Low Medium Low Medium High High Low Medium Low Medium High High E 616 755 846 980 1018 1197 1291 1399 Factory Default 571 698 767 886 909 1083 1197 1284 489 627 681 812 834 968 1081 1179 SINGLE SIDE RETURN AIR 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1305 1425 18 1250 1350 12 1195 1290 6 1135 1230 Factory Default 1070 1165 6 995 1100 12 995 1030 18 870 960 COOLING 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm DIP Switch Settings Low Medium Low Medium High 2High Low Medium Low Medium High 2High 611 830 971 995 1160 1274 1376 Factory Default 575 674 748 870 889 1075 1160 1270 519 604 691 786 808 952 1056 1147 1 Cooling and heating speeds are based on a combination o Settings Factory default setting DIP sw
4. A INDOOR EQUIPMENT GREEN WHITE YELOW RED NON COMMUNICATING OUTDOOR AIR CONDITIONING UNIT 1 OR 2 STAGE OOOO OUTDOOR EQUIPMENT ooo oooo 00 02 YL 2STG ONLY BL LSOM ONLY OUTDOOR EQUIPMENT 1 N CLIP ON BOARD LINK W915 Y1 TO Y2 FOR TWO STAGE OPERATION DADAAN NOTE On communicating systems extra wires must terminate on the C icomfort terminal strip RSBus Use an additional wire and come off C terminal and wire nut all the extra wires together Termination on the outdoor control must match the indoor control icomfort Integrated Control Outdoor Unit icomfort Touch FIGURE 30 Page 27 Optional Accessories for use with any icomfort Touch System NOTE icomfort Touch THERMOSTAT SENSES HUMIDITY amp CONTROLS HUM CONTACTS TO CYCLE HUMIDIFIER 120V CONNECTIONS BASED ON DEMAND NO OTHER CONTROL OR HUMIDIS TAT REQUIRED Vues OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HU MIDIFIER IF NOT ALREADY IN THE SYSTEM FOR OTHER FUNCTIONS BUILT INTO ALL icomfort by Lennox OUT DOOR UNITS T HUM CONTACT IS 120VAC CLOSED ANYTIME N HUMIDIFIER HUMIDITY DEMAND IS PRESENT FURNACE ONLY T OTHER 120VAC ACC OUTPUT IS 120VAC AIR ENERGIZED ANYTIME NEUTRAL N CLEANER BLOWER IS RUNNING icomfort ENAB
5. _ 875 980 1070 1255 1260 1400 1560 1815 SINGLE SIDE RETURN AIR 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1640 1805 18 1560 1715 12 1480 1630 6 1400 1545 Factory Default 1325 1455 6 1245 1370 12 1165 1280 18 1085 1195 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm Low Medium Low Medium High 2 High Low Medium Low Medium High High 1020 1160 1285 1550 1505 1690 1855 2125 Factory Default 940 1050 1155 1400 1375 1525 1685 1935 835 945 1020 1250 1235 1380 1505 1730 1 Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control Refer to Installation Instructions for specific DIP Switch Settings Factory default setting NOTES The effect of static pressure is included in air volumes shown First stage HEAT is approximately 91 of the same second stage HEAT First stage COOL two stage air conditioning units only is approximately 7096 of the same second stage COOL speed position Continuous Fan Only speed is selectable at 28 3896 70 and 100 of the selected second stage cooling speed minimum 500 cfm Lennox Harmony III Zone Control Applications Minimum blower speed is 485 cfm
6. Air Handler Unit Dampers open during cooling operation only Heating Unit Installed Upstream of Cooling Unit Evaporator FIGURE 1 When installed this furnace must be electrically grounded according to local codes In addition in the United States installation must conform with the current National Elec tric Code ANSI NFPA No 70 The National Electric Code ANSI NFPA No 70 is available from the following ad dress National Fire Protection Association 1 Battery March Park Quincy MA 02269 NOTE This furnace is designed for a minimum continu ous return air temperature of 60 F 16 C or an intermit tent operation down to 55 F 13 C dry bulb for cases where a night setback thermostat is used Return air tem perature must not exceed 85 F 29 C dry bulb The SL280UHV furnace may be installed in alcoves clos ets attics basements garages and utility rooms in the up flow or horizontal position This furnace is not designed for installation in mobile homes recreational vehicles or outdoors Never use an open flame to test for gas leaks Check all connections using a commercially available soap solution made specifically for leak detection Use of Furnace as Construction Heater Lennox does not recommend the use of SL280UHV units as a construction heater during any phase of construction Very low return air temperatures harmful vapors and op eration of the unit with clogged or mis
7. OTHER APPLIANCE NOTE 1 Refer to the provided venting tables for installations Refer to the capacity requirements shown in the provided venting tables FIGURE 23 Page 15 Common Venting Using Tile Lined Interior Masonry Chimney and Combined Vent Connector P d MINIMUM LENGTH AS SHORT AS PRACTICAL Pus FOR MAXIMUM LENGTH SEE NOTE TO LEFT NOTE Refer to provided venting tables for installations INTERIOR TILE LINED MASONRY CHIMNEY NOTE the chimney must be properly OTHER APPLIANCE aiffr ow sized per provided venting tables or lined with listed metal lining system VENT EX E CONNECTOR PERMANENTLY SEALED FIREPLACE OPENING FIGURE 24 DO NOT insulate the space between the liner and the chimney wall with puffed mica or any other loose gran ular insulating material AIMPORTANT SINGLE appliance venting of a fan assisted furnace into a tile lined masonry chimney interior or outside wall is PROHIBITED The chimney must first be lined with either type B1 vent or an insulated single wall flexible vent lining system which has been sized ac cording to the provided venting tables and the vent pipe manufacturer s instructions A fan assisted furnace may be commonly vented into an existing lined masonry chimney if the following conditions are met The chimney is currently serving at
8. LSOM Compressor low voltage Page 66 Required amount of current is not passing through Start current transformer Clears the error after cur rent is sensed in START sensor or after power re set Required amount of current is not passing through Run current transformer Clears the error after cur rent is sensed in RUN sensor or 1 normal compres sor run cycle or after power reset Compressor runs continuously Clears the error after 1 normal compressor run cycle or after power reset Secondary voltage is below 18VAC After 10 min utes operation is discontinued Clears the code after voltage is higher than 20 VAC for 2 seconds or after power reset Program Unit Capacity Size Mode and capacity If three horizontal bars are displayed followed by continuous E203 furnace control does not recognize unit size code Configure per the following Power Up Number displayed represents by integrated control unit size code furnace model 3 Furnace control in IDLE mod lt No heating cooling or indoor 5 gt operation To enter Program Unit Capacity Size push and hold button next to 7 segment LED display Turn room thermostat to OFF until solid P symbol appears Release button IMPORTANT Field replacement controls may need to be manually configured to validate furnace unit size code UNIT SIZE UNIT SIZE CODE FURNACE MODEL CODE FURNACE MODEL A
9. Refer to tables for corresponding cfm values TABLE 13 Cooling Mode Blower Speeds tow O MediumLow Of On Switches 7 and 8 Cooling Blower Speed Adjustment The unit is shipped from the factory with the dip switches positioned for NORMAL no adjustment The dip switches may be positioned to adjust the blower speed by 10 or 10 to better suit the application Table 14 below provides blower speed adjustments that will result from different switch settings Refer to tables for corresponding cfm val ues TABLE 14 Cooling Blower Speed Adjustment Adjustment Switch7 Switchs 10 approx Factory Default 10 approx Of On Switches 9 and 10 Cooling Mode Blower Speed Ramping Blower speed ramping may be used to en hance dehumidification performance The switches are factory set at option A which has the greatest effect on de humidification performance Table 15 provides the cooling mode blower speed ramping options that will result from different switch settings The cooling mode blower speed ramping options are detailed on the next page NOTE The off portion of the selected ramp profile also ap plies during heat pump operation in dual fuel applications Page 36 TABLE 15 Cooling Mode Blower Speed Ramping Ramping Option Switch9 Switch 10 A Factory p up C on p Om i Ramping Option A Factory Selection e Motor runs at 50 for 30 seconds e Motor then r
10. 1 Vent diameter recommendations and maximum allow able piping runs are found in the provided venting tables 2 In no case should the vent or vent connector diameter be less than the diameter specified in the provided venting tables 3 The minimum vent capacity determined by the sizing tables must be less than the low fire input rating and the maximum vent capacity must be greater than the high fire input rating 4 Single appliance vents If the vertical vent or tile lined chimney has a larger diameter or flow area than the vent connector use the vertical vent diameter to de termine the minimum vent capacity and the vent connector diameter to determine the maximum vent capacity The flow area of the vertical vent however shall not exceed 7 times the flow area of the listed ap pliance categorized vent area drafthood outlet area or flue collar area unless designed according to approved engineering methods Multiple appliance vents The flow area of the largest section of vertical vent or chimney shall not exceed 7 times the smallest listed appliance categorized vent area drafthood outlet area or flue collar area unless de signed according to approved engineering methods 1 Page 16 6 The entire length of single wall metal vent connector shall be readily accessible for inspection cleaning and replacement 7 Single appliance venting configurations with zero lat eral lengths tables 3 and 4 are assumed to have
11. 9 s MANIFOLD PRESSURE GAS VALVE SHOWN IN ON POSITION FIGURE 36 8 Move gas valve switch to ON position Do notforce See figure 35 or 36 9 Replace the upper access panel 10 Turn on all electrical power to to the unit 11 Set the thermostat to desired setting NOTE When unit is initially started steps 1 through 11 may need to be repeated to purge air from gas line Page 51 12 If the appliance will not operate follow the instructions Turning Off Gas to Unit and call your service techni cian or gas supplier Turning Off Gas to Unit 1 Setthe thermostat to the lowest setting 2 Turn off all electrical power to the unit if service is to be performed 3 Remove the upper access panel 4 Move gas valve switch to OFF position Do notforce See figure 35 or 36 5 Replace the upper access panel Failure To Operate If the unit fails to operate check the following 1 Is the thermostat calling for heat 2 Are access panels securely in place 3 Is the main disconnect switch closed 4 15 there blown fuse or tripped circuit breaker 5 Is the filter dirty or plugged Dirty or plugged filters will cause the limit control to shut the unit off 6 Is gas turned on at the meter 7 15 the manual main shut off valve open 8 Is the internal manual shut off valve open 9 Is the unit ignition system in lock o
12. AIRFLOW COVER BOTH Maximum UNITAND RETURN SIDE RETURN AIR BASE 7 1 4 2 9 AIR OPENINGS OPENINGS 184 148 Either Side FA 23 4 1 2 368 A Width OPTIONAL 584 17 1 2 446 B Width 50w98 RETURN AIR BASE 26 7 8 21 533 C Width 50W99 683 24 1 2 622 D Width 51W00 SIDE VIEW NOTE Optional Side Return Air Filter Kits are not for use with Optional Return Air Base 1 Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet Minimum unit side return air opening dimensions for units requiring 1800 cfm or more of air W x H 23 x 11 in 584 x 279 mm The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown Side return air openings must be cut in the field There are cutting guides stenciled on the cabinet for the side return air opening The size of the opening must not extend beyond the markings on the furnace cabinet 2 To minimize pressure drop the largest opening height possible up to 14 inches is preferred FIGURE 9 Page 10 Removing the Bottom Panel Remove the two screws that secure the bottom cap to the furnace Pivot the bottom cap down to release the bottom panel Once the bottom panel has been removed reinstall the bottom cap See figure 10 Removing the Bottom Panel Bottom Cap Horizontal Application Installation C
13. E 205 Gas valve control relay contact shorted Check wiring on control and gas valve If wiring is correct replace control E 206 Gas valve second stage relay failure Furnace will operate on 18 stage for remainder of the heating demand Will clear after fault recovered If unable to operate 2nd stage replace control E 207 Hot surface ignitor sensed open Refer to troubleshooting See Page 68 Measure resistance of hot surface ignitor Replace if open or not within specified range found in Resumes normal operation after fault is cleared Page 62 Integrated Control Diagnostic Codes continued Diagnostic Codes Status of Equipment Action Required to Clear and Recover E223 Low pressure switch failed open Check pressure inches w c of low pressure switch closing on heat call Measure operating pressure inches w c Inspect vent and combustion air in ducer for correct operation and restriction Re sumes normal operation after fault is cleared Measure operating pressure inches w c Inspect vent and combustion air inducer for correct opera tion and restriction Resumes normal operation after 224 Low pressure switch failed closed Refer to troubleshooting See Check operation of low pressure switch to see if it is Page 68 stuck closed on heat call longer than 150 seconds fault is cleared E225 High pressure switch failed open Refer to troubleshooting See Check pressure inches w c of high
14. Page 45 BLOWER DATA SL280UH110V60C BLOWER PERFORMANCE less filter SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1635 1800 18 1555 1710 12 1475 1625 6 1395 1535 Factory Default 1320 1450 6 1240 1365 12 1160 1275 18 1080 1190 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm po Low Medium Low Medium High 2 High Low Medium Low Medium High High 1085 1160 1270 1490 1595 1660 1840 215 Factory Default 1010 1040 1160 1375 1470 1535 1655 1940 _ 900 955 1025 1205 1315 1365 1510 1735 Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control Refer to Installation Instructions for specific DIP Switch Settings Factory default setting NOTES The effect of static pressure is included in air volumes shown First stage HEAT is approximately 91 of the same second stage HEAT First stage COOL two stage air conditioning units only is approximately 7096 of the same second stage COOL speed position Continuous Fan Only speed is selectable at 28 38 70 and 100 of the selected second stage cooling speed minimum 500 cfm Lennox Harmony III Zone Control Applications Minimum blo
15. 1305 1635 1525 1600 1840 2255 Factory Default 960 1005 1175 1480 1355 1435 1635 2035 _ 845 925 1050 1340 1240 1315 1520 1850 1 Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control Refer to Installation Instructions for specific DIP Switch Settings 2 Factory default setting NOTES The effect of static pressure is included in air volumes shown First stage HEAT is approximately 91 of the same second stage HEAT First stage COOL two stage air conditioning units only is approximately 70 of the same second stage COOL speed position Continuous Fan Only speed is selectable at 28 38 70 and 100 of the selected second stage cooling speed minimum 500 cfm Lennox Harmony III Zone Control Applications Minimum blower speed is 426 cfm Page 47 BLOWER DATA SL280UH135V60D BLOWER PERFORMANCE less filter SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1840 2025 18 1750 1925 12 1660 1830 6 1575 1730 Factory Default 1485 1630 6 1395 1535 12 1305 1435 18 1215 1340 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm po Low Medium Low Medium High 2 High L
16. 20 TABLE 7 Vent Connector Capacity Type B Double Wall Vents with Single Wall Metal Connectors Serving Two or More Category Appliances Vent and Connector Diameter D inches Lateral Lar pur amen _ cz j ipeo 7 Appliance Input Rating in Thousands of Btu Per Hour MAX MAX wa 1 19 25 s t p 2 e 250 10 25 puro c qoem n ws m5 82 252 t 29 2 s s rs t 3 NOTE Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system For all other vent configurations the vent system is assumed to have two 90 elbows For each additional 90 elbow or equivalent for example two 45 elbows equal one 90 elbow beyond two the maximum capacity listed in the venting table should be reduced by 10 percent 0 90 x maxi mum listed capacity TABLE 8 Common Vent Capacity Type B Double Wall Vents with Single Wall Metal Connectors Serving Two or More Category Appliances Common Vent Diameter D inches Appliance Input Rating in Thousands of Btu Per Hour Page 21 Removal of the Furnace from Common Vent In the event that an existing furnace is removed from a venting system commonly run with separate gas ap pliances the venting system is likely to be too large to properly vent the remaining attached appliances Conduct the follow
17. 25 Repeat steps 24 and 26 until no leaks are detected Remove 5 screws if necessary either side of cabinet 26 Replace access panel FIGURE 41 Page 58 Planned Service The following items should be checked during an annual inspection Power to the unit must be shut off for the service techni cian s safety Fresh air grilles and louvers on the unit and in the room where the furnace is installed Must be open and unob structed to provide combustion air Burners Must be inspected for rust dirt or signs of water Vent pipe Must be inspected for signs of water damaged or sagging pipe or disconnected joints Unit appearance Must be inspected for rust dirt signs of water burnt or damaged wires or components Blower access panel Must be properly in place and pro vide a seal between the return air and the room where the furnace is installed Return air duct Must be properly attached and provide an air seal to the unit Operating performance Unit must be observed during operation to monitor proper performance of the unit and the vent system Combustion gases Flue products must be analyzed and compared to the unit specifications Problems detected during the inspection may make it nec essary to temporarily shut down the furnace until the items can be repaired or replaced Instruct the homeowners to pay attention to their furnace Situations can arise between annual furnace in spections t
18. 5 If second stage heat is required the thermostat sec ond stage heat contacts close and send a signal to the integrated control The integrated control initiates a 30 second second stage recognition delay 6 At the end of the recognition delay the integrated con trol energizes the combustion air inducer at high speed The control also checks the high fire second stage pressure switch to make sure it is closed The high fire second stage gas valve is energized and the indoor blower motor is energized for operation at the high fire heating speed 7 When the demand for high fire second stage heat is satisfied the combustion air inducer is switched to the low fire heating speed and the high fire second stage gas valve is de energized The low fire first stage gas valve continues operation The indoor blower motor is switched to the low fire heating speed When the thermostat demand for low fire first stage heat is satisfied the gas valve is de energized and the field selected indoor blower off delay begins The combustion air inducer begins a 5 second post purge period 9 When the combustion air post purge period is com plete the inducer the HUM contacts as well as the 120V ACC terminals are de energized The indoor blower is de energized at the end of the off delay 1 Page 54 Applications Using A Single Stage Thermostat See figure 38 for ignition control sequence B Heating Sequence Integra
19. FAN INDOOR BLOWER 2 SECOND ON DELAY ENERGIZE INDOOR BLOWER LOW COOLING MODE MAINTAIN INDOOR BLOWER LOW COOLING MODE ENERGIZE 2ND STAGE COOLING CONTACTOR COMPRESSOR amp FAN MAINTAIN INDOOR BLOWER HIGH COOLING MODE DE ENERGIZE 2ND STAGE COOLING CONTACTOR COMPRESSOR amp FAN ENERGIZE AND MAINTAIN INDOOR BLOWER AT LOW COOLING MODE DE ENERGIZE 1ST STAGE COOLING CONTACTOR NcoNrROL WILL NOT RESPOND TO A 2ND STAGE COOLING REQUEST UNLESS A 1ST STAGE COMPRESSOR amp FAN COOLING REQUEST IS ACTIVE INDOOR BLOWER LOW COOLING MODE AND HIGH COOLING MODE HAVE SPECIFIC ON OFF DE ENERGIZE INDOOR AND SPEED RAMPING PROFILES THE SPECIFIC PROFILE IS SELECTED USING THE BLOWER A DIP SWITCHES ON THE CONROL Page 71 Troubleshooting Continuous Fan Sequence of Operation CALL FOR FAN CALL FOR FAN INDOOR BLOWER CONTINUOUS FAN MAINTAIN INDOOR BLOWER AT CONTINUOUS FAN REQUEST FOR COOLING Un TS 2 GO CALL FOR COOLING CONTINUOUS FAN REQUEST FOR HEAT INDOOR BLOWER OFF RECEIVED O GO TO CALL FOR 1ST STAGE HEAT DE ENERGIZE INDOOR BLOWER Page 72
20. O on the integrated control W951 must be cut when the furnace is installed in applications which include a heat pump unit and a thermostat which features dual fuel use If the link is left intact terminal O will remain ener gized eliminating the HEAT MODE in the heat pump On Board Link W915 2 Stage Compr Y1 to Y2 On board link W915 is a clippable connection between ter minals Y1 and Y2 on the integrated control W915 must be cut if two stage cooling will be used If the Y1 to Y2 link is not cut the outdoor unit will operate in second stage cooling only Diagnostic LED Figure 34 The seven segment diagnostic LED displays operating status target airflow error codes and other information The table beginning on Page 60 lists diagnostic LED codes Diagnostic Push Button Figure 34 The diagnostic push button is located adjacent to the seven segment diagnostic LED This button is used to en able the Error Code Recall E mode and the Flame Signal F mode Press the button and hold it to cycle through a menu of options Every five seconds a new menu item will be displayed When the button is released the displayed item will be selected Once all items in the menu have been displayed the menu resumes from the beginning until the button is released Error Code Recall Mode Select E from the menu to access the most recent 10 error codes Select c from the Error Code Recall menu to clear all error codes Button must be p
21. Side SIDE RETURN 9 1 8 232 Right 2 AIR FILTER KIT 8 5 8 219 Left 5 Ither oide Either Side s 838 H NG 5 3 8 137 Right ase e oa ELECTRICAL INLET 2 3 4 70 Left o Either Side 14 3 4 23 1 1 2 ERES 16 584 G9 406 T h 1 Side Return ince Air Opening AIR FLOW 4 y Y m Either Side 5 8 3 4 16 1 15 16 49 19 Bottom Return Air Opening 3 1 4 23 1 2 83 597 FRONT VIEW Bottom Return SIDE VIEW in A B D Model No SL280UH070V36A 14 1 2 13 3 8 SL280UH090V36B SL280UH090V60C SL280UH135V60D 24 12 622 23 3 8 546 Page 2 Parts Arrangement HEAT EXCHANGER COMBUSTION AIR INDUCER COMBUSTION AIR INDUCER PRESSURE SWITCH CABINET GAS VALVE ROLLOUT SWITCH BURNER BOX INNER BLOWER ACCESS PANEL 5 E o x 5 8 Q o 5 69 o o lt transformer and circuit breaker ACCESS PANEL BLOWER ASSEMBLY FIGURE 1 Page 3 SL280UHV Gas Furnace The SL280UHV gas furnace is equipped with a two stage variable speed integrated control the control is compat ible with Communicating thermostats icomfort Touch Non comunicating thermostats ComfortSense or other conventional thermostats Control systems Harmony III Zone Control System non communicating Each SL280UHV u
22. call for heat thermostat first stage contacts close sending a signal to the integrated control The inte grated control runs a self diagnostic program and checks high temperature limit switches for normally closed contacts and pressure switches for normally open contacts The combustion air inducer is ener gized at low speed 2 Once the control receives a signal that the low pres sure switch has closed the combustion air inducer be gins a 15 second pre purge in low speed NOTE If the low fire pressure switch does not close the combustion air inducer will switch to high fire After a 15 second pre purge the high fire pressure switch will close and the unit will begin operation on high fire After 10 to 20 seconds of high fire operation the unit will switch to low fire After the pre purge is complete a 20 second initial ig nitor warm up period begins The combustion air in ducer continues to operate at low speed 4 After the 20 second warm up period has ended the gas valve is energized on low fire first stage and ignition oc curs At the same time the control module sends a sig nal to begin an indoor blower 30 second ON delay When the delay ends the indoor blower motor is ener gized on the low fire heating speed the HUM contacts close energizing the humidifier and 120V ACC termi nal is energized The furnace will continue this opera tion as long as the thermostat has a first stage heating demand 1
23. fac tors such as length of run number of fittings and fur nace rating to avoid excessive pressure drop Table 9 lists recommended pipe sizes for typical applications 1 The gas piping must not run in or through air ducts clothes chutes gas vents or chimneys dumb waiters or elevator shafts 4 The piping should be sloped 1 4 inch 6 4 mm per 15 feet 4 57 m upward toward the meter from the fur nace The piping must be supported at proper intervals every 8 to 10 feet 2 44 to 3 01 m with suitable hang ers or straps Install a drip leg in vertical pipe runs to the unit 5 A 1 8 N P T plugged tap or pressure post is located on the gas valve to facilitate test gauge connection See figures 35 and 36 6 In some localities codes may require the installation of a manual main shut off valve and union furnished by the installer external to the unit The union must be of the ground joint type AIMPORTANT Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petro leum gases NOTE If emergency shutoff is necessary shut off the main manual gas valve and disconnect main power to the fur nace The installer should properly label these devices TABLE 9 Gas Pipe Capacity 3 m3 hr Nominal Iron Pipe Size inches mm Internal Diameter inches mm 17 75 3 4 824 360 250 200 170 151 138 125 118 110 19 05 20 930 10 19 7 08
24. flow restricted below the minimum Check for dirty filter and air flow restriction Check E290 lgnitor circuit fault Failed ignitor or triggering circuitry Measure resistance of hot surface ignitor Replace if blower performance 1 hour soft lockout Cleared when heat call finishes successfully assembly does not operate or meet performance standards 1 hour soft lockout Clears after circula E292 Indoor blower motor unable to start due to obstructed wheel seized Indoor blower motor unable to start seized bear bearings ing stuck wheel etc Replace motor or wheel if tor successfully starts performance standards Clears after inducer current is sensed to be in range after the ignition following 294 Combustion air inducer over current Check combustion blower bearings wiring and amps Replace if does not operate or does not meet the soft lockout or reset and amps Replace if necessary Cleared after E295 blower motor temperature is too high Indoor blower motor over temperature motor tripped on internal protector Check motor bearings blower demand is satisfied place sensor if necessary Cleared in Communicat ing mode 30 seconds after fault recovered In Non Communicating mode Cleared after the current E310 Discharge error temperature sensor failure Only shown if shorted or Compare outdoor sensor resistance to temperature out of range resistance charts in installation instructions Re hea
25. handler Clears after fault recovered E 116 High 24V 24 Volt Power High Range is 18 to 30 volts Check and correct voltage Check for proper line voltage 120V 240V etc to equipment Clears when con trol senses proper voltage E 117 Poor ground detected Warning only Provide proper grounding for unit Check for proper earth ground to the system Warning only will clear 30 seconds after fault recovered E 120 Unresponsive device Communication only Usually caused by delay in outdoor unit responding to indoor unit poling Recycle power Check all wir ing connections Cleared after unresponsive device responds to any inquiry E 124 Active communicating thermostat signal missing for more than 3 min Equipment lost communication with the thermostat utes Check four wiring connections ohm wires and cycle power at the thermostat Alert stops all services and waits for heartbeat message from thermostat sub net controller Cleared after valid thermostat sub net controller message is received E 125 Control failed self check internal error failed hardware Will restart if Hardware problem on the control Cycle power on error control Replace if problem prevents service and is recovers Integrated control not communicating Covers hardware errors persistent Critical alert Cleared 300 seconds after flame sense circuit faults pin shorts etc fault recovered E 126 Control internal communication problem Hardwa
26. in this manual were extracted from the National Fuel Gas Code NFPA 54 ANSI 2223 1 and are provided as a guide for proper vent installation Proper ap plication termination construction and location of vents must conform to local codes having jurisdiction In the ab sence of local codes the NFGC serves as the defining doc ument Refer to the tables and the venting information contained in these instructions to properly size and install the venting system AIMPORTANT Once the venting system is installed attach the Dis connected Vent warning sticker to a visible area of the plenum near the vent pipe See figure 22 The warning sticker is provided in the bag assembly Or der kit 66W04 for additional stickers AWARNING Asphyxiation hazard The exhaust vent for this fur nace must be securely connected to the furnace flue transition at all times VENT CONNECTION DISCONNECTED VENT WARNING STICKER VENT PIPE min 6 length FIGURE 22 Use self drilling sheet metal screws or a mechanical fas tener to firmly secure the vent pipe to the round collar of the flue transition If self drilling screws are used to attach the vent pipe it is recommended that three be used Drive one self drilling screw through the front and one through each side of the vent pipe and collar See figures 19 21 and 22 Install the first vent connector elbow at a minimum of six inches 152 mm from the furnace vent o
27. is positioned for SINGLE stage thermostat use Switches 3 and 4 Blower Off Delay The blower on delay of 30 seconds is not adjustable The blower off delay time that the blower operates after the heating demand has been satisfied can be adjusted by moving switches 3 and 4 on the integrated control The unit is shipped from the factory with a blower off delay of 90 seconds The blower off delay affects comfort and is adjustable to satisfy individ ual applications Adjust the blower off delay to achieve a supply air temperature between 90 and 110 F at the exact moment that the blower is de energized Longer off delay settings provide lower supply air temperatures shorter set tings provide higher supply air temperatures Table 12 pro vides the blower off timings that will result from different Switch settings TABLE 12 Blower Off Delay Switch Settings m mes em Seconds 6 C On Of O On 180 On O k Indoor Blower Operation DIP Switch Settings Switches 5 and 6 Cooling Mode Blower Speed The unit is shipped from the factory with the dip switches posi tioned for high speed 4 indoor blower motor operation during the cooling mode Table 13 provides the cooling mode blower speeds that will result from different switch settings Switches 5 and 6 set the blower cfm for second stage cool The integrated control automatically ramps down to 70 of the second stage cfm for first stage cfm
28. is present but compressor is not running Check power to outdoor unit Clears vice is removed or after power reset error after 30 consecutive normal run cycles or power reset Also monitors low pressure switch E401 LSOM Compressor long run cycle or low system pressure Compressor ran more than 18 hours to satisfy a single thermostat demand Critical Alert Clears the trips pressor overloaded Clears the error after 4 consec E402 LSOM Outdoor unit system pressure trip Discharge or suction pressure out of limits or com utive normal compressor run cycles door unit pressure trip thermostat demand Clears the error after 4 consec E403 LSOM Compressor short cycling Running less than 4 minutes Out Compressor runs less than 3 minutes to satisfy a utive normal run cycles or power reset less than 4 minutes short bearings are seized excessive liquid refriger ant etc Clears the error after 4 consecutive normal 404 LSOM Compressor rotor locked Compressor short cycling Running Compressor rotor locked up due to run capacitor run cycles or after power reset tion open fuse etc Clears the error after 1 normal E405 LSOM Compressor open circuit Compressor circuit open due to power disconnec compressor run cycle Page 65 Integrated Control Diagnostic Codes continued LSOM Compressor open start circuit LSOM Compressor open run circuit LSOM Compressor contactor is welded
29. it Placing the furnace into operation SL280UHV units are equipped with an automatic ignition system Do not attempt to manually light burners on these furnaces Each time the thermostat calls for heat the burners will automatically light The ignitor does not get hot when there is no call for heat on units with an automatic ignition system AWARNING If you do not follow these instructions exactly a fire or explosion may result causing property damage personal injury or death Gas Valve Operation Figures 35 and 36 1 STOP Read the safety information at the beginning of this section 2 Setthe thermostat to the lowest setting 3 Turn off all electrical power to the unit 4 This furnace is equipped with an ignition device which automatically lights the burners Do not try to light the burners by hand 5 Remove the upper access panel 6 Move gas valve switch to OFF position Do not force See figure 35 or 36 7 Wait five minutes to clear out any gas If you then smell gas STOP Immediately call your gas supplier from a neighbor s phone Follow the gas suppliers instruc tions If you do not smell gas go to next step WHITE RODGERS GAS VALVE HIGH FIRE ADJUSTMENT MANIFOLD SCREW under cap INLET PRESSURE POST PRESSURE TAP GAS VALVE SHOWN IN ON POSITION FIGURE 35 HONEYWELL GAS VALVE HIGH FIRE ADJUSTING SCREW INLET PRESSURE TAP under cap ON SIDE US
30. no elbows in the vent system For all other vent configura tions the vent system is assumed to have two 90 el bows For each additional 90 elbow or equivalent for example two 45 elbows equal one 90 elbow beyond two the maximum capacity listed in the venting table should be reduced by 1096 0 90 x maximum listed ca pacity 8 The common venting tables 5 6 7 and 8 were gen erated using a maximum horizontal vent connector length of 1 1 2 feet 46 m for each inch 25 mm of connector diameter as follows TABLE 2 Connector Diameter Maximum Horizontal inches mm Connector Length feet m 3 76 4 1 2 1 37 4 102 6 1 83 5 127 7 1 2 2 29 6 152 9 2 74 7 178 10 1 2 3 20 9 If the common vertical vent is offset the maximum common vent capacity listed in the common venting tables should be reduced by 20 the equivalent of two 90 elbows 0 80 x maximum common vent capacity The horizontal length of the offset shall not exceed 1 1 2 feet 46 m for each inch 25 mm of common vent diameter 10 The vent pipe should be as short as possible with the least number of elbows and angles required to com plete the job Route the vent connector to the vent us ing the shortest possible route 11 A vent connector shall be supported without any dips or sags and shall slope a minimum of 1 4 inch 6 4 mm per linear foot 305 mm of connector back toward the appliance 12 Vent connectors shall be fir
31. plate qx e T A make up box collector box Disconnect pressure switch hose from barbed fitting on the pres sure switch assembly Remove pressure switch assembly 1 Screw and cut wire tie to free pressure switch wires Re install pressure switch on the other side of orifice plate and re connect pressure switch hose Re secure pressure switch wires by either pulling excess wires through the blower compartment and securing with supplied wire tie or coil excess wire and secure to the gas manifold FIGURE 18 HORIZONTAL LEFT POSITION Side Vent Discharge pressure switch flue transition make up box collector box Disconnect pressure switch hose from barbed fitting on the pressure switch assembly Remove pressure switch assembly 1 screw and cut wire tie to free pressure switch wires Re install pressure switch on the other side of orifice plate and re connect pressure switch hose Re secure pressure switch wires by either pulling excess wires through the blower compartment and securing with supplied wire tie or coil excess wire and secure to the gas manifold FIGURE 19 Page 14 HORIZONTAL RIGHT POSITION T
32. return air temperatures have stabilized check the temperature rise If necessary adjust the heating blower speed to maintain the temperature rise within the range shown on the unit nameplate Increase the blower speed to decrease the temperature rise Decrease the blower speed to increase the temperature rise Failure to properly adjust the temperature rise may cause erratic limit operation Thermostat Heat Anticipation Set the heat anticipator setting if adjustable according to the amp draw listed on the wiring diagram that is attached to the unit NOTE Do not secure the electrical conduit directly to the air ducts or structure Heating Sequence of Operation Electronic Ignition The two stage variable speed integrated control used in SL280UHV units has an added feature of an internal Watch guard control The feature serves as an automatic reset de vice for ignition control lockout caused by ignition failure Af ter one hour of continuous thermostat demand for heat the Watchguard will break and remake thermostat demand to the furnace and automatically reset the control to begin the ignition sequence NOTE The ignition control thermostat selection DIP switch is factory set in the WO STAGE position Applications Using a Two Stage Thermostat See figure 37 for ignition control sequence A Heating Sequence Integrated Control Thermostat Selection DIP Switch 1 OFF in Two Stage Position Factory Setting 1 On a
33. solid c clears the error history Must press button while flashing c is displayed to clear error codes When the solid F is displayed the control enters the Flame Signal Mode The Flame Signal Mode is exited with power cycle reset by pressing and holding the push button until horizontal line are displayed after 10 minutes of entering flame signal mode Diagnostic Codes Status of Equipment Action Required to Clear and Recover Idle mode Decimal blinks at 1 Hertz 0 5 second ON 0 5 second OFF Cubic feet per minute cfm setting for indoor blower 1 second ON 0 5 second OFF cfm setting for current mode displayed Cooling stage 1 second ON 0 5 second OFF 1 or 2 displayed Pause cfm setting displayed Pause Repeat codes Dehumidification mode 1 second ON 1 second OFF cfm setting dis played Pause Repeat Codes Heat pump stage 1 second ON 0 5 second OFF of input rate dis played Pause cfm setting Pause Repeat codes Gas Heat Stage 1 second ON 0 5 second OFF 1 or 2 displayed Pause cfm setting displayed Pause Repeat codes Blinking during ignition Defrost mode Discharge Air Temperature Page 60 Integrated Control Diagnostic Codes continued Diagnostic Codes Status of Equipment Action Required to Clear and Recover Device communication problem No other devices on RS BUS Commu Equipment is unable to communicate Indicates nication numerous mes
34. step 10 if removed See figure 41 15 units only replace inserst 11 Back wash using steam Begin from the burner opening 16 Reinstall collector box and combustion air assembly on each clam Steam must not exceed 275 F Reinstall all screws to the collector box and combustion air inducer Failure to replace all screws may cause 12 To dean burners run a vacuum cleaner with a soft brush leaks Inspect gaskets for any damage and replace if attachment over the face of burners Visually inspect in side the burners and crossovers for any blockage necessary caused by foreign matter Remove any blockage Figure 17 Reinstall burner box manifold assembly and burner box 39 shows burner detail cover Page 57 SL280UHV NOX INSERTS 18 Reconnect all wires 19 Reconnect top cap and vent pipe to combustion air in ducer outlet 20 Reconnect gas supply piping 21 Turn on power and gas supply to unit 22 Set thermostat and check for proper operation 23 Check all piping connections factory and field for gas leaks Use a leak detecting solution or other preferred means A CAUTION Some soaps used for leak detection are corrosive to certain metals Carefully rinse piping thoroughly af ter leak test has been completed Do not use matches candles flame or other sources of ignition to check for gas leaks 24 If aleakis detected shut gas and electricity off and repair leak FIGURE 40
35. the blocking effect of louvers grilles or screens must be considered If the design and free area of protective cov ering is not known for calculating the size opening required it may be assumed that wood louvers will have 20 to 25 per cent free area and metal louvers and grilles will have 60 to 75 percent free area Louvers and grilles must be fixed in the open position or interlocked with the equipment so that they are opened automatically during equipment operation Page 7 CHIMNEY OR GAS VENT EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE Inlet Air from Crawlspace and Outlet Air to Ventilated Attic VENTILATION LOUVERS Each end of attic FURNACE VENTILATION LOUVERS For unheated crawl space WATER HEATER NOTE The inlet and outlet air openings shall each have a free area of at least one square inch 645 mm per 4 000 Btu 1 17 kW per hour of the total input rating of all equipment in the enclosure EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE CHIMNEY All Air Through Ventilated Attic OR GAS VENTILATION LOUVERS Each end of attic FURNACE INLET AIR Ends 12 in AT above bottom WATER HEATER NOTE The inlet and outlet air openings shall each have a free area of at least one square inch 645 mm per 4 000 Btu 1 17 kW per hour of the total input rating of all equip ment in the enclosure FIGURE 4 FIGURE 3 EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE WATER HEATER
36. the thermostat is set to FAN ON the indoor blower will run continuously at a field selectable per centage of the second stage cooling speed when there is no cooling or heating demand The factory default setting is 38 of cool speed 2 When the SL280UHV is running in the heating mode the indoor blower will run on the heating speed desig nated by the positions of DIP switches 11 12 and 13 First stage heating will run at 9196 heat speed 3 When there is a cooling demand the indoor blower will run on the cooling speed designated by the positions of DIP switches 5 and 6 First stage cooling will run at 70 cool speed Communicating NOTE When the SL280UHV is used with icomfort Touch thermostat proper indoor blower speed selec tions are made by the communicating thermostat 1 When the thermostat is set to FAN ON the indoor blower will run at setting determined during system configuration 2 When there is a heating demand the fan will run on heating speeds for firing rate 3 When there is a cooling demand the fan will run on the first stage and second stage cooling speed set using the icomfort Touch thermostat in the installer setup mode The factory default is based upon 400 CFM a ton Generator Use Voltage Requirements The following requirements must be kept in mind when specifying a generator for use with this equipment The furnace requires 120 volts Range 102 volts to 132 volts
37. the unit according to local codes or in the absence of local codes according to the current National Electric Code ANSI NFPA No 70 A green ground wire is provided in the field make up box NOTE The SL280UHV furnace contains electronic components that are polarity sensitive Make sure that the furnace is wired correctly and is properly grounded 7 One line voltage ACC 1 4 spade terminal is provided on the furnace integrated control Any electronic air cleaner or other accessory rated up to one amp can be connected to this terminal with the neutral leg of the cir cuit being connected to the one of the provided neutral terminals See figure 34 for control configuration This terminal is energized when the indoor blower is operat ing Page 25 8 An unpowered normally open dry set of contacts with a 1 4 spade terminal HUM are provided for humidifi er connections and may be connected to 24V or 120V Any humidifier rated up to one amp can be connected to these terminals In 120V humidifier applications the neutral leg of the circuit can be connected to one of the provided neutral terminals This terminal is energized in the heating mode 9 Install the room thermostat according to the instruc tions provided with the thermostat See table 11 for field wiring connections in varying applications If the furnace is being matched with a heat pump refer to the instruction packaged with the dual fuel thermostat Thermo
38. 0 cu bic feet 1 42 m3 per 1 000 Btu 29 kW per hour of the combined input rating of all appliances installed in that space This definition includes furnace closets or small equipment rooms When the furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space contain ing the furnace the return air must be handled by ducts which are sealed to the furnace casing and which terminate outside the space containing the furnace This is especially important when the furnace is mounted on a platform in a confined space such as a closet or small equipment room Even a small leak around the base of the unit at the platform or at the return air duct connection can cause a potentially dangerous negative pressure condition Air for combustion and ventilation can be brought into the confined space either from inside the building or from outside EQUIPMENT IN CONFINED rt SPACE ALL AIR FROM INSIDE OR GAS VENT OPENINGS To Adjacent Room FURNACE c NOTE Each opening shall have a free area of at least one square inch 645 mm per 1 000 Btu 29 kW per hour of the total input rat ing of all equipment in the enclosure but not less than 100 square inches 64516 mm FIGURE 2 Air from Inside If the confined space that houses the furnace adjoins a space categorized as unconfined air can be brought in by providing two permanent openings between the two spaces Each opening must hav
39. 1 0 in w g Cooling External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1255 1425 18 1235 1355 12 1170 1290 6 1110 1220 Factory Default 1045 1150 6 980 1080 12 920 1010 18 855 945 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm pid Low Medium Low Medium High 2 High Low Medium Low Medium High 2 High 660 905 1030 1175 985 1290 1495 1675 Factory Default 600 760 930 1045 905 1125 1345 1525 _ 535 700 850 970 815 1040 1225 1385 Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control Refer to Installation Instructions for specific DIP Switch Settings Factory default setting NOTES The effect of static pressure is included in air volumes shown First stage HEAT is approximately 91 of the same second stage HEAT First stage COOL two stage air conditioning units only is approximately 7096 of the same second stage COOL speed position Continuous Fan Only speed is selectable at 28 38 70 and 100 of the selected second stage cooling speed minimum 500 cfm Lennox Harmony III Zone Control Applications Minimum blower speed is 455 cfm Page 42 BLOWER DATA SL280UH090V60C BLOWER PERFORMANCE less filter BOTTOM RETURN AIR RETURN AIR FROM BOTH SIDES OR RETURN AIR FROM BOTTOM AND ONE SID
40. 5 66 4 81 4 28 3 91 8 54 3 34 3 11 680 465 375 320 285 260 240 220 205 195 26 919 25 13 17 10 62 9 06 8 07 7 36 6 80 6 23 5 80 5 52 1 1 4 1 380 1400 950 770 660 580 530 490 460 430 400 31 75 35 052 39 64 26 90 21 80 18 69 16 42 15 01 13 87 13 03 12 18 11 33 1 1 049 25 4 26 645 2 2 067 3950 2750 2200 1900 1680 1520 1400 1300 1220 50 8 52 502 111 85 77 87 62 30 53 80 47 57 43 04 39 64 36 81 84 55 2 1 2 2 469 6300 4350 3520 3000 2650 2400 2250 2050 1950 1850 63 5 67 713 178 39 123 17 99 67 84 95 75 04 67 96 63 71 58 05 55 22 52 38 1 1 2 1 610 2100 460 1180 990 900 810 750 690 650 620 Length of Pipe feet m 10 20 30 40 50 60 70 80 90 100 3 048 6 096 9 144 12 192 15 240 18 288 21 336 24 384 27 432 30 480 1 2 622 175 120 97 82 73 66 61 57 53 50 12 7 17 799 4 96 340 275 2 32 2 07 1 87 1 73 1 61 1 50 1 42 3 3 54 3 3 11 1 42 103 2 92 1150 32 56 3 3 068 11000 7700 6250 5300 4750 4300 3900 3700 3450 3250 76 2 77 927 811 48 218 03 176 98 150 07 134 50 121 76 110 43 104 77 97 69 92 03 NOTE Capacity given in cubic feet m of gas per hour and based on 0 60 specific gravity gas Page 23 Left Side Pipi
41. AT PRESSURE SWITCH 128 LOW HEAT SENSOR PRESSURE SWITCH SWITCH Dee eg UE GO SEVEN 1 21 1 ROOM THERMOSTAT ACC segment NEUTRALS TRANSFORMER SECONDARY 12345678 LED A92 LIMIT 00000000 lel INTEGRATED DIAGNOSTIC 11121314 15 PUSH II BUTTON TB78 A O SENSOR C DISCHARGE r OUTDOOR AIR OUTDOOR Q UNIT C TB82 Y1 RS BUS l LINK C B8 R J CIRCUIT BREAKER PEE EE A 5 5 0059099 l C l C TERMINAL BOARD 1 OUTDOOR INDOOR A USE COPPER CONDUCTORS ONLY FIELD INSTALLED CLASS 24V FIELD INSTALLED LINE VOLTAGE FIGURE 33 Page 34 Integrated Control 7 SEGMENT LED FLAME SENSE DIAGNOSTIC PUSH BUTTON DIP SWITCHES OUTDOOR AIR SENSOR TERMINALS DISCHARGE AIR SENSOR TERMINALS TB83 COMMUNICATING OUTDOOR EQUIPMENT TB84 COMMUNICATING INDOOR THERMOSTAT RS BUS LINK TB82 future use I DATA HIGH CONNECTION DATA LOW CONNECTION RS BUS OUTDOOR TB83 R 24VAC DATA HIGH CONNECTION DATA LOW CONNECTION 24VAXC COMMON RS BUS INDOOR TB84 R 24VAC DATA HIGH CONNECTION DATA LOW CONNECTION C 24VAXC COMMON 1 4 QUICK CONNECT TERMINALS HUM UNPOWERED NORMALLY OPEN DRY CONTACTS XMFR 120 VAC OUTPUT TO TRANSFORMER LI 120 VAC INPUT TO CONTROL ACC 120 VAC OUTPUT TO OPTIONAL ACCESSORY NEUTRALS 120 VAC NEUTRAL HS CAI NEUTRAL INDOOR BLOWER CONNE
42. CTOR 12 LOW VOLTAGE CONNECTOR W915 Y1 TO Y2 2 STAGE COMPR W951 RTO HEAT PUMP W914 R TO DS DEHUM OR HARMONY NON COMMUNICATINGA 24V TERMINALS THERMOSTAT CONNECTIONS TB1 DS DEHUMIDIFICATION SIGNAL W2 HEAT DEMAND FROM 2ND STAGE T STAT W1 HEAT DEMAND FROM 1ST STAGE T STAT R CLASS 2 VOLTAGE TO THERMOSTAT G MANUAL FAN FROM T STAT C THERMOSTAT SIGNAL GROUND CONNECTED TO TRANSFORMER GRD TR amp CHASIS GROUND GRD Y1 THERMOSTAT 1ST STAGE COOL SIGNAL Y2 THERMOSTAT 2ND STAGE COOL SIGNAL O THERMOSTAT SIGNAL TO HEAT PUMP REVERSING VALVE DH DEHUMIDIFICATION OUTPUT COMMUNICATING THERMOSTAT ONLY L USE ONLY WITH A COMMUNICATING THERMOSTAT AND A NON COMMUNICATING OUTDOOR UNIT FIGURE 34 Page 35 Integrated Control DIP Switch Settings Conventional Thermostat non communi cating SL280UHV units are equipped with a two stage variable speed integrated control This control manages ignition timing heating mode fan off delays and indoor blower speeds based on selections made using the control dip switches and jumpers The control includes an internal watchguard feature which automatically resets the ignition control when it has been locked out After one hour of con tinuous thermostat demand for heat the watchguard will break and remake thermostat demand to the furnace and automatically reset the control to relight the furnace Note All icomfort settings are set at the icomfort
43. Continued CALL FOR SECOND STAGE HEAT FOR 2ND STAGE HEAT HIGH FIRE A SINGLE STAGE 2 STAGE THERMOSTAT THERMOSTAT RECOGNITION DELA 30 SECONDS ON DELAY ONLY FOR 1S EXPIRED EXPIRED REQUEST FOR 2ND STAGE HEAT INDUCER SWITCHED TO HIGH SPEED PRESSURE SWITC NO INDUCER SWITCHED 5 MINUTE DELAY A CLOSED WITHIN 10 TO LOW SPEED ERROR CODE FLASHES 2ND STAGE GAS VALVE ENERGIZED INDOOR BLOWER ENERGIZED ON HIGH HEAT SPEED CALL FOR HEAT SATISFIED A SYSTEM WILL ALWAYS LIGHT ON LOW FIIRE EVEN IF 2ND STAGE HEAT IS IN PLACE A WHEN USED WITH A SINGLE STAGE THERMOSTAT SET SW1 TO THE ON POSITION IN DIP SWITCH S4 A IF THE HIGH FIRE PRESSURE SWITCH DOES NOT CLOSE WITHIN 5 ATTEMPTS THE SYSTEM WILL OPERATE AT LOW FIRE FOR THE REMAINDER OF THE CALL FOR HEAT REQUEST Page 69 Troubleshooting Heating Sequence of Operation Continued CALL FOR HEAT SATISFIED FIRST STAGE HEAT SECOND STAGE HEAT RUN MODE 1ST OR 2ND STAGE CALL FOR HEAT ALL INPUTS MONITORED LIMIT PRESSURE CALL FOR HEAT COOL FLAME LEVEL ND STAG CALL FOR HEAT SATISFIED 1ST STAG CALL FOR HEAT SATISFIED INDUCER OFF AFTER 5 SECOND POST PURGE INDOOR BLOWER OFF AFTER FIELD SELECTABLE OFF DELAY Page 70 Troubleshooting Cooling Sequence of Operation Continued CALL FOR COOLING 1ST STAGE COOLING REQUEST RECEIVED WAIT FOR COMPRESSOR TIMED OFF DELAY TO EXPIRE ENERGIZE 1ST STAGE COOLING CONTACTOR COMPRESSOR amp
44. D on PRECISION MODE operates independent of a Y1 thermostat demand Normal Opera Dehumidification 2 Jon Jon Comments Dehumidification mode begins when humidity is 70 greater than set point 2 2 call ComfortSense 7000 thermostat will try to MT maintain room humidity Dehumidification 1 On On On On 0 i 70 setpoint by allowing the call ONLY ante room space to maintain a cooler room thermostat setpoint ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING BASIC MODE only active on a Y1 thermostat demand Norman oper 4 on on On Acceptable High 100 ComfortSense 7000 ien thermostat energizes Y2 Dehumidification 0 and de energizes D on a PRECISION MODE operates independent of a Y1 thermostat demand Normal Opera 24 x Ben midificati begins when humidity is Dehumidification 0 4 ComfortSense 7000 call ONLY 1 On On On On Demand VAC High 70 thermostat will try to maintain room humidity Jumpers at indoor unit with a two stage outdoor unit setpoint by allowing the Cut factory jumper from Y1 to Y2 or cut W915 Y1 to Y2 room space to maintain a With Condensing unit Cut W914 R to DS on SureLight control cooler room thermostat With Heat Pump Cut W914 R to DS amp W951 R to O on SureLight control setpoint gag Dave Lennox ComfortSense 7000 thermostat to use for this application Y2081 4 heat 2 cool Norma
45. E 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1420 1565 18 1355 1490 12 1285 1415 6 1215 1335 Factory Default 1145 1260 6 1080 1185 12 1010 1110 18 940 1035 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm po Low Medium Low Medium High 2 High Low Medium Low Medium High High 1110 1205 1420 1680 1575 1740 2000 2305 Factory Default 1005 1100 1280 1545 1440 1595 1820 2125 890 1015 1125 1380 1295 1450 1610 1930 SINGLE SIDE RETURN AIR 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1360 1500 18 1295 1425 12 1230 1355 6 1165 1280 Factory Default 1100 1210 6 1030 1135 12 965 1065 18 900 990 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm pii Low Medium Low Medium High High Low Medium Low Medium High High 1050 1165 1335 1620 1515 1680 1915 2225 Factory Default 955 1060 1215 1480 1390 1545 1735 2060 _ 840 945 1090 1290 1220 1385 1580 1825 1 Cooling and heating speed
46. LED SL280UHV FURNACE 24 HUMIDIFIER CONNECTIONS HCWB2 HCWBS HCWP3 24VAC 2 HUMIDIFIER Discharge Air Sensor Required for even heat u DISCHARGE AIR SENSOR CS 7000 48G95 RELAY 17742 THERMOSTAT 120VAC Bowes 2 Dp 512 HUMIDIFIER CONVENTIONAL NON COMMUNI r aN 240VAC STEAM 4 CATING SYSTEM HUMIDIFIER TIT poles pce COMMUNICATING SYSTEM icomfort Touch THERMOSTAT GREEN S WHITE YELLOW RED RSBus OUTDOOR AIR SENSOR 120 43995 RELAY n OUTDOOR EQUIPMENT INDOOR EQUIPMENT 4 13 Maximum total length of all con nections on the RSBus is limited to 1500ft Wire gauge of 24V IN RSBus wire is 18 PURPLE JUMPE N C T10 N C t 000 R e T11 HUM COM 4 T12 N O i 6 pz wen LEO 24V IN jumper not used in non HRV3 OR ERV3 communicating configuration E RED e 2000 000000000000 BLACK INvOPR EQUP C CR icomfort ENABLED HUMIDITROL EDA ON SL280UHV FURNACE In an icomfort by Lennox system neither furnace nor air handler trans former will have adequate VA to power 24V UV light applicatio
47. LENNOX 2011 Lennox Industries Inc Dallas Texas USA i UPFLOW AIR FLOW HORIZONTAL LEFT HORIZONTAL RIGHT AWARNING Improper installation adjustment alteration service or maintenance can cause property damage person al injury or loss of life Installation and service must be performed by a licensed professional installer or equivalent service agency or the gas supplier INSTALLATION INSTRUCTIONS SL280UHV DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE UPFLOW HORIZONTAL AIR DISCHARGE Technical Publications Litho U S A 506763 01 06 2011 Supersedes 03 2011 THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE This a safety alert symbol and should never be ignored When you see this symbol on labels or in manuals be alert to the potential for personal injury or death ACAUTION As with any mechanical equipment personal injury can result from contact with sharp sheet metal edges Be careful when you handle this equipment NOTICE A thermostat is not included and must be ordered separately e The Lennox icomfort Touch thermostat must be used in communicating applications e non communicating applications the Lennox ComfortSense 7000 thermostat may be used as well as other non communicating thermostats In all cases setup is critical to ensure proper sys tem operation Field wiring for both communicating and non com municating applications is illu
48. OR MAKE UP BOX INSTALLATION Right Side FIGURE 29 Refer to figure 33 for unit field wiring See figures 30 and 31 for icomfort Touch thermostat wiring in communicating applications Table 11 shows DIP switch and on board link settings for non communicating thermostat applications Typical wiring schematic is shown in figure 32 1 The power supply wiring must meet Class restric tions Protected by either a fuse or circuit breaker se lect circuit protection and wire size according to unit nameplate NOTE Unit nameplate states maximum current draw Maximum over current protection allowed is shown in table 10 TABLE 10 Maximum Over Current SL280UH Model Protection Amps 070V36A 09036B 15 0 090V48B 090V60C 110V60C 135V60D 2 2 Holes are on both sides of the furnace cabinet to facili tate wiring 3 Install a separate properly sized disconnect switch near the furnace so that power can be turned off for servicing 4 Before connecting the thermostat or the power wiring check to make sure the wires will be long enough for servicing at a later date Remove the blower access panel to check the length of the wire 5 Complete the wiring connections to the equipment Use the provided unit wiring diagram and the field wir ing diagrams shown in table 11 and figure 33 Use 18 gauge wire or larger that is suitable for Class ll ra ting for thermostat connections 1 Electrically ground
49. P a C AG gt o uz o Bot lt x UL gt Uh FURNACE TERM STRIP Wiring Connections HEAT PUMP outdoor sensor HEAT PUMP TABLE 11 SL280 Field Wiring Applications With Conventional Thermostat Continued DIP Switch 1 Thermostat Thermostat On Board Links Must Be Cut To Select Wiring Connections Heating System Options Stages Dual Fuel FURNACE HEAT PUMP Single Stage TERM STRIP Heat Pump CUT ON BOARD LINK ComfortSense 951 7000 177240 PME thermostat w dual fuel capa bilities Capable of 2 stage gas heat control w dehu midification control HARMONY outdoor sensor Dual Fuel FURNACE HEAT PUMP Two Stage CUT ON BOARD LINK TERM STRIP w915 e CUT FR Heat Pump 2 STAGE COMPR SELECTION ComfortSense 7000 L7724U CUT ON BOARD LIN W951 thermostat w HEAT dual fuel capa PUMP bilities CUT ON BOARD LINK Capable of 2 914 stage gas heat control w dehu HARMONY midification Y2 6 out blue loutdoor sensor Connect W1 to W1 ONLY if using defrost tempering kit 67M41 NOTE Do NOT make a wire connection between the room thermostat L terminal and the L terminal of the SL280 integrated control Page 32 120V ACC IF USED 1 ROOM THERMOSTAT 0900009 OUTDOOR 1 UNIT 4 S51 DOOR INTERLOCK ZX ROLLOUT INTERLOCK COMBUSTION AIR BLOWER MOTOR R33 IGNITOR SL280UHV Schematic
50. PICAL SYSTEM SHOWN FOR 2 HEAT 2 COOL WITH A CONVENTIONAL THERMOSTAT SEE INSTALLATION INSTRUCTIONS FOR CONNECTIONS TO OTHER EQUIPMENT AND ACCESSORIES A92 INTEGRATED CONTROL INDOOR WARNING Program unit capacity size Character on 7 Furnace Circulator segmentLED Model Motor Size w dot ON ___ gt _____ 6 12 C osoxvass 1HP 060066 ue A DIP SWITCH FACTORY DEFAULT IS FOR A TWO STAGE THERMOSTAT FIELD SUPPLIED ACC WIRE USE COPPER CONDUCTORS ONLY A DISCHARGE AND OUTDOOR AIR TERMINALS ARE FOR icomfort USE ONLY THERMOSTAT CONNECTIONS ARE FOR NON COMMUNICATING SYSTEM ONLY REFER TO icomfort INSTALLATION INSTRUCTIONS FOR COMMUNICATING SYSTEMS DH AND L TERMINALS ARE ONLY USED WITH icomfort THERMOSTAT 51 ROOM THERMOSTAT A HEAT COOL TWOSTAGE INDOOR EQUIPMENT OUTDOOR EQUIPMENT A OUTDOOR DISCHARGE AIR SENSOR ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES GROUND LINE VOLTAGE FIELD INSTALLED CLASS 1 VOLTAGE FIELD WIRING NOTE IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT MUST BE REPLACED WITH WIRE OF LIKE SIZE DENOTES OPTIONAL COMPONENTS RATING INSULATION THICKNESS AND TERMINATION FIGURE 32 Page 33 TYPICAL SL280UHV FIELD WIRING DIAGRAM 120V ACC 10 IF USED PRIMARY COMBUSTION AIR GAS J84 INDUCER MOTOR LIMIT P84 HIGH HE
51. RREZE SYSTEM WIRING 5 PASS INDOOR BLOWER MOTOR COMMON WIRE THROUGH CURRENT LOOP SL280UHV FURNACE icomfort FIGURE 31 Page 28 TABLE 11 SL280 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On Board Links See figure 34 x is On Board Links Must Cut Select ermosta System Options Heating Stages Wiring Connections 1 Heat 1 Cool FURNACE OUTDOOR NOTE Use DIP TERM STRIP UNIT switch 2 to set second stage heat ON delay DO NOT CUT ANY OFF 7 minutes ON BOARD LINKS ON 12 minutes 1 Heat 2 Cool FURNACE OUTDOOR TERM STRIP UNIT NOTE Use DIP switch 2 to set gt second stage 2 aa 5 heat ON delay CUT ON BOARD LINK 7 W915 ON 12 minutes 2 STAGE 9 COMPR F Oa 9 1 Heat 2 Cool CUT ON BOARD LINK FURNACE OUTDOOR with t stat with W915 TERM STRIP UNIT humidity control 2 STAGE COMPR NOTE Use DIP switch 2 to set second stage heat ON delay OFF 7 minutes ON 12 minutes Not required on all units Page 29 TABLE 11 SL280 Field Wiring Applications With Conventional Thermostat Continued DIP Switch Settings and On Board Links See figure 34 DIP Switch 1 Thermostat Thermostat Heating Stages On Board Links Must Be Cut To Select Wirina C S
52. SL280UH070V36A A SL280DF070V36A SL280UH090V36B b SL280DF090V48B SL280UH090V48B SL280DF090V60C d Solid stars SL280UH090V60C SL280DF110V60C T 4 T oomen LED Z l N SL280UH110V60C SL280UH135V60D When the correct unit size code is displayed release button Selected code will flash for 10 second period During that period press and hold push button for 5 seconds Integrated control will store code in memory and will automatically exit Program Unit Capacity Size Mode and reset If second period expires or push button is held less than five seconds control will automatically exit Program Capacity Size Mode and go into IDLE mode without storing unit size code If this happens programming function must be repeated Verify that selected unit size code is correct E and stored in non volatile memory by cycling the 24 volt power to the furnace control At 24 volt power up of the furnace control the 7 segment LED will display a unit size code If three horizontal bars display board does not recognize unit size code Programming function must be repeated Push and hold button Integrated control will display unit size code number for each furnace model for three seconds FINISHED Page 67 Troubleshooting Heating Sequence of Operation CALL FOR FIRST STAGE HEAT CALL FOR 1ST STAGE HEAT LOW FIRE INDOOR BLOWER OFF AFTER HEA
53. T FAN OFF DELAY LOW HEAT SPEED INDOOR BLOWER OFF ERROR INDOOR AFTER HEAT FAN _ WATCHGUARD CODE BLOWER OFF DELAY LOW gt ERROR CODE FLASHES ON LOW HEAT HEAT SPEED FLASHES SPEED ROLLOUT ERROR CALL DE ENERGIZE CODE FOR HEAT CIRCUITS 2 GAS VALVE INDOOR BLOWER FLAsHES ENDS ON LOW HEAT P D INDUCER OFF AFTER POST ERROR CODE PURGE FLASHES AFTER 5 SECONDS INDOOR BLOWER LOW PRESSURE SWITCH OPENS OFF AFTER HEAT OFF DELAY HARD LOCKOUT ERROR CODE FLASHES SECONDS INDUCER WAS INDUCER TO OW amp HIGH TURNED ONZ PRESSURE SWITC CLOSED WITHIN 30 FLASHES SECONDS PRE PURGE 15 SECONDS WAIT BLOWER INTERPURGE 5 MINUTES OFF AFTER H S 1 ON 20 SECONDS 15 SECONDS ERROR CODE FLASHES HEAT FAN 1ST STAGE GAS VALVE ENERGIZED IGNITION TRIAL HEAT FAN ON BEGINS ON TIMER STARTED POSTPURGE INDUCER WATCHGUARD 5 SECONDS ERROR CODE FLASHES YES H S I OFF WATCHGUARD LOCKOUT AUTOMATICALLY RESETS AFTER ONE HOUR INDOOR BLOWER ON 30 SEC A HARD LOCKOUT REQUIRES THERMOSTAT RESET OR CYCLING OF POWER TO RESET THE LOCKOUT LOW HEAT SPEED A IN CASE HIGH SPEED INDUCER IS RUNNING AT THE TIME THE GAS VALVE GETS ENERGIZED 2ND STAGE GAS VALVE IS ENERGIZED INSTEAD OF 1ST STAGE 20 SECONDS AFTER FLAME IS SENSED INDUCER SWITCHES TO LOW SPEED AND GAS VALVE SWITCHES TO 1ST STAGE CALL FOR HEAT SATISFIED Page 68 Troubleshooting Heating Sequence of Operation
54. Touch thermostat See icomfort installation instruction In icom fort communication system all DIP switch and clippable link settings are ignored For conventional thermostats pro ceed with DIP switch and clippable link settings as outlined in the following Heating Operation DIP Switch Settings Switch 1 Thermostat Selection This unit may be used with either a single stage or two stage thermostat The thermostat selection is made using a DIP switch which must be properly positioned for the particular application The DIP switch is factory positioned for use with a two stage thermostat If a single stage thermostat is to be used the DIP switch must be repositioned Select OFF for two stage heating operation con trolled by a two stage heating thermostat factory set ting b Select ON for two stage heating operation con trolled by a single stage heating thermostat This set ting provides a timed delay before second stage heat is initiated Switch 2 Second Stage Delay Used with Single Stage Thermostat Only This switch is used to deter mine the second stage on delay when a single stage ther mostat is being used The switch is factory set in the OFF position which provides a 7 minute delay before second stage heat is initiated If the switch is toggled to the ON position it will provide a 12 minute delay before second stage heat is initiated This switch is only activated when the thermostat selector jumper
55. Wiring Diagram BURNERS COMBUSTION AIR INDUCER MOTOR E O O FLAME FLAME SWITCH SENSOR VEW T SEVEN HUM SEGMENT 12345678 LED 00010 B DIAGNOSTIC 9101112131415 PUSH 0 eros TB78 A SENSOR DISCHARGE OUTDOORAIR Rs Bus TB82 H LINK t TB84 l c R OUTDOOR INDOOR A92 INTEGRATED CONTROL A92 INTEGRATED CONTROL IGNITOR FLAME ROLLOUT SWITCH A92 INTEGRATED CONTROL CIRCUIT BREAKER TERMINAL BOARD 102 HIGH HEAT 128 LOW HEAT PRESSURE SWITCH PRESSURE SWITCH 102 HIGH HEAT PRESSURE SWITCH 5128 LOW HEAT PRESSURE SWITCH 521 SECONDARY LIMIT BLOWER SPEED CHART SECONDARY LIMITS USED te ii HUM TO L ATIFC HARMONY FROM DS TO R AT A92 CONTROL BOARD WHEN USED WITH Comfortsense g 7000 THERMOSTAT CUT W951 JUMPER FROM O TO R LABELED HEAT PUMP AT A92 CONTROL BOARD WHEN USED FOR DUAL FUEL APPLICATIONS JUMPER W915 FROM Y1 TO Y2 IS FACTORY INSTALLED AT A92 CONTROL BOARD LEAVE IN FOR ONE STAGE COOL THERMOSTAT CUT JUMPER Y1 TO Y2 FOR TWO STAGE COOL THERMOSTAT A L13 USED ON 1HP ONLY CUT W914 JUMPER LABELED DEHUM OR A THERMOSTAT HEAT ANTICIPATION SETTING 65 HONEYWELL VALVE 43 AMP WHITE RODGERS VALVE NOTE SEE INSTALLATION INSTRUCTIONS FOR PROCEDURE TO SET CORRECT BLOWER SPEED FOR SPECIFIC COOLING TONNAGE BEING APPLIED AND HEATING TEMPERATURE RISE DESIRED TY
56. ace when the blower and burners are operating Gas fumes which could contain carbon monoxide can be drawn into living space resulting in personal inju ry or death This unit is not equipped with a filter or rack A field pro vided high velocity filter is required for the unit to operate properly Table 1 lists recommended filter sizes A filter must be in place any time the unit is operating TABLE 1 Furnace Cabinet Width Side Return Bottom Return 14 1 2 16 X 25 X 1 1 14 X25 X 1 1 17 1 2 16X25 X1 1 16X25 X1 1 16 25 1 1 20 25 1 1 24 1 2 16 X 25X 1 2 24 X 25 X 1 1 Duct System Use industry approved standards such as those pub lished by Air Conditioning Contractors of America or Ameri can Society of Heating Refrigerating and Air Conditioning Engineers to size and install the supply and return air duct system This will result in a quiet and low static system that has uniform air distribution NOTE Do not operate the furnace in the heating mode with an external static pressure that exceeds 0 8 inches w c Higher external static pressures may cause erratic lim it operation Supply Air Plenum If the furnace is installed without a cooling coil a removable access panel must be installed in the supply air duct The access panel should be large enough to permit inspection either by smoke or reflected light of the heat exchanger for leaks after the furnace is installed The furnace access pa
57. and heating speeds are based on a combination of DIP switch settings on the furnace control Refer to Installation Instructions for specific DIP Switch Settings Factory default setting NOTES The effect of static pressure is included in air volumes shown First stage HEAT is approximately 91 of the same second stage HEAT First stage COOL two stage air conditioning units only is approximately 7096 of the same second stage COOL speed position Continuous Fan Only speed is selectable at 28 38 7096 and 100 of the selected second stage cooling speed minimum 500 cfm Lennox Harmony III Zone Control Applications Minimum blower speed is 480 cfm Page 44 BLOWER DATA SL280UH110V60C BLOWER PERFORMANCE less filter BOTTOM RETURN AIR RETURN AIR FROM BOTH SIDES OR RETURN AIR FROM BOTTOM AND ONE SIDE 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1690 1855 18 1605 1765 12 1525 1675 6 1445 1585 Factory Default 1360 1495 6 1280 1405 12 1200 1315 18 1115 1230 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm Low Medium Low Medium High High Low Medium Low Medium High High 1060 1220 1330 1565 1535 1710 1910 2210 Factory Default 970 1075 1180 1430 1400 1565 1715 2015
58. any mechanical equipment personal injury can result from contact with sharp sheet metal edges Be careful when you handle this equipment Certifications SL280UHV units are CSA International certified to ANSI Z21 47 In the USA installation of gas furnaces must conform with local building codes In the absence of local codes units must be installed according to the current National Fuel Gas Code ANSI Z223 1 The National Fuel Gas Code is available from the following address American National Standards Institute Inc 11 West 42nd Street New York NY 10036 Clearances Adequate clearance must be made around the air open ings into the vestibule area In order to ensure proper unit operation combustion and ventilation air supply must be provided according to the current National Fuel Gas Code Vent installations must be consistent with the venting tables in this instruction and applicable provisions of local building codes This furnace is CSA International certified for installation clearances to combustible material as listed on the unit nameplate and in the tables in figures 7 and 11 Accessibility and service clearances must take precedence over fire protection clearances NOTE For installation on combustible floors the furnace shall not be installed directly on carpeting tile or other combustible material other than wood flooring Installed Locations For installation in a residential garage the furnace must be insta
59. asher must be removed before the furnace is placed into opera tion After the bolt and washer have been removed the rig id leg will not touch the blower housing SL280UHV07036A and SL280UHV09036B WITH 1 2 HP BLOWER MOTOR RIGID LEG remove shipping bolt and washer FIGURE 6 Upflow Applications Allow for clearances to combustible materials as indicated on the unit nameplate Minimum clearances for closet or al cove installations are shown in figure 7 Upflow Application Installation Clearances Top Left Side Right Side AIR FLOW Bottom Type of Vent ee ont 2 1 4 in 57 mm 2 1 4 57 mm Front clearance in alcove installation must be 24 in 610 mm Maintain a minimum of 24 in 610 mm for front service access 3 1 4 in if single wall vent pipe is used For installation a combustible floor do not install the furnace directly on carpeting tile or other combustible materials other than wood flooring TLeft side requires 3 inches if a single wall vent is used on 14 1 2 inch cabinets or 2 in if a single wall vent is used on 17 1 2 in cabi nets FIGURE 7 Page 9 Return Air Upflow Applications Single Side Return Air with transition and filter Return air can be brought in through the bottom or either side of the furnace installed in an upflow application If the furnace is installed on a platform with bottom return make an airtight seal b
60. at secure the combustion air in ducer pressure switch assembly to the collector box Carefully remove the combustion air inducer to avoid damaging blower gasket If gasket is damaged it must be replaced to prevent leakage 5 Remove the collector box located behind the combus tion air inducer Be careful with the collector box gas ket If the gasket is damaged it must be replaced to prevent leakage 6 Disconnect gas supply piping Remove the screw se curing the burner box cover and remove cover Re move the four screws securing the burner manifold as sembly to the vestibule panel and remove the assembly from the unit 7 Remove screws securing burner box and remove burner box 8 NOX units only Remove screw securing NOX insert Remove NOX insert See figure 40 Page 56 SL280UHV BURNER COMBUSTION AIR INDUCER ASSEMBLY amp HEAT EXCHANGER REMOVAL 00000000 66000000 heat exchanger burners manifold and gas valve Cross over FIGURE 39 9 Remove screws from both sides top and bottom of 13 To clean the combustion air inducer visually inspect and vestibule panel using a wire brush clean where necessary Use com 10 Remove heat exchanger It may be necessary to pressed air to clean off debris and any rust spread cabinet side to allow more room If so remove 14 Reinstall heat exchanger in vestibule Replace the five screws from the left side or right side of cabinet five screws in the cabinet from
61. ated control with non communicating Operation stopped Y1 relay Stage 1 failed Pilot E313 Indoor or outdoor unit capacity mismatch Communication only Incorrect indoor outdoor capacity code selected Check for proper configuring in installation instruc outdoor unit relay contacts did not close or the relay coil did not energize no input back to IFC chip Critical Alert Cleared after reset and Y 1 input sensed outdoor unit not close or the relay coil did not energize no input back to IFC chip Critical Alert Cleared after reset 348 No 24 Volt output on Y2 of integrated control with non communicating Y2 relay Stage 2 failed Pilot relay contacts did and Y1 input sensed cating outdoor unit Dual fuel module required for heat pump application place link or hard wire Applicable in non communi cating mode Critical Alert E370 switch sensed open for 2 minutes Control sees the loss of 24VAC for 2 minutes Ter minate all services and wait for interlock switch to E 349 No 24 Volts between R amp O on integrated control with non communi Configuration link R to O needs to be restored Re close The alarm will clear when 24VAC is continu ously sensed on DS terminal for a minimum of 10 Seconds or on a power reset the error after current is sensed in both RUN and START sensors for at least 2 seconds or after ser E400 LSOM Compressor internal overload tripped Thermostat demand 1
62. change implies the display will continue to show whatever is currently being displayed for normal operation blinking decimal active error code heat state etc After the P is selected by releasing the push button the integrated control will start flashing the P on display for 90 seconds If push button is pressed again and held during that time the control will start to display characters corresponding to different variable speed furnace models for 3 seconds each While the wanted character model is displayed push button has to be released Selected option will flash display for 10 seconds and during that time push button has to be pressed and held for 5 seconds Once control accepts new setting it will store data in non volatile memory and reset itself If 10 sec onds expires or push button is held less than 5 seconds control will exit filed test mode and go in idle without programming the unit size Integrated Control Diagnostic Codes Press the diagnostic push button and hold it to cycle through a menu of options Every five seconds a new menu item will be displayed Release the button when the desired mode is displayed When a solid P is displayed the furnace capacity size is programmed When the solid E is displayed the control enters the Diagnostic Recall Alarm History Diagnostic Recall mode menu options No change displaying error history remains in Diagnostic Recall mode solid exits Diagnostic Recall mode and
63. city Size Mode 67 Troubleshooting 68 506763 01 LUNA RAE Unit Dimensions inches mm NOTE 60C and 60D units that require air volumes over 1800 cfm 3 1 8 79 850 L s must have one of the following 1 Return air from single side transition will accommodate 20 x 25 x1 in 508 x 635 x 25 cleanable air filter Required to maintain proper air jon velocity 2 Single side return air with optional RAB Return E Air Base SUPPLY AIR 3 Return air from bottom and one side 4 Return air from both sides FLUE AE 1010 5 Return air from bottom Top i n See blower performance tables for additional information 00000 2Flue outlet may be horizontal but furnace must be ee vented vertically external side return air filter kit cannot be used _ with the optional RAB Return Air Base 3 OPTIONAL EXTERNAL a T SIDE RETURN 603 AIR FILTER KIT 25 Either Side 635 TOP VIEW 1 1 2 38 _ 27 3 4 B 9 16 14 Front Panel 705 l 3 1 4 83 i 3 76 Right 19 7 16 9 16 7 178 Left 494 14 F 3 OPTIONAL Q FLUE OUTLET EXTERNAL yq Either
64. ctions Turn on the appliance that is being inspected Adjust the thermostat so that the appliance operates continuously 5 After the main burner has operated for 5 minutes test for leaks of flue gases at the draft hood relief opening Use the flame of a match or candle or smoke from a cigarette cigar or pipe 6 After determining that each appliance connected to the common venting system is venting properly step 3 return all doors widows exhaust fans fireplace damp ers and any other gas burning appliances to their pre vious mode of operation N If a venting problem is found during any of the preced ing tests the common venting system must be modi fied to correct the problem Resize the common venting system to the minimum vent pipe size determined by using the appropriate tables in Appendix G These are in the current stan dards of the National Fuel Gas Code ANSI Z223 1 Page 22 CAUTION If a flexible gas connector is required or allowed by the authority that has jurisdiction black iron pipe shall be installed at the gas valve and extend outside the furnace cabinet The flexible connector can then be added between the black iron pipe and the gas supply line Gas Supply 1 This unit is shipped standard for left or right side instal lation of gas piping or top entry in horizontal applica tions Connect the gas supply to the piping assembly 2 When connecting the gas supply piping consider
65. e Conversion Kits LP Propane Natural Gas to to LP Propane Kit Natural Gas LP Propane Natural Gas to to LP Propane Kit Natural Gas Kit 7501 7501 7501 10 000 ft 0 7500 ft 10 000 ft 0 7500 ft 10 000 ft 0 7500 ft 10 000 ft 0 7500 ft 73W37 51W02 73W38 69W79 070 77W05 77W07 77W11 77W09 High Altitude Natural Gas Orifice Kit High Altitude Natural Gas Orifice Kit 73W37 51W02 73W38 69W79 77W05 77W07 77W11 77W09 73W37 51W02 73W38 69W79 77W05 77W07 77W11 77W09 135 73W37 51W02 73W38 69W79 77W05 77W07 77W11 77W09 Page 53 Other Unit Adjustments Primary and Secondary Limits The primary limit is located on the heating compartment vestibule panel The secondary limits if equipped are lo cated in the blower compartment attached to the back side of the blower These auto reset limits are factory set and re quire no adjustment Flame Rollout Switches Two These manually reset switches are located on or inside of the burner box If tripped check for adequate combustion air before resetting Pressure Switches The pressure switch assembly includes two switches is located in the heating compartment adjacent to the com bustion air inducer These switches check for proper com bustion air inducer operation before allowing ignition trial The switches are factory set and require no adjustment Temperature Rise Place the unit into operation with a second stage heating demand After supply and
66. e a minimum free area of 1 square inch 645 mm per 1 000 Btu 29 kW per hour of total input rating of all gas fired equipment in the confined space Each opening must be at least 100 square inches 64516 mm One opening shall be within 12 inches 305 mm of the top of the enclosure and one opening within 12 inches 305 mm of the bottom See figure 2 Air from Outside If air from outside is brought in for combustion and ventila tion the confined space must have two permanent open ings One opening shall be within 12 inches 305 mm of the top of the enclosure and one opening within 12 inches 305 mm of the bottom These openings must communicate di rectly or by ducts with the outdoors or spaces crawl or at tic that freely communicate with the outdoors or indirectly through vertical ducts Each opening shall have a minimum free area of 1 square inch 645 mm per 4 000 Btu 1 17 kW per hour of total input rating of all equipment in the en closure See figures 3 and 4 When communicating with the outdoors through horizontal ducts each opening shall have a minimum free area of 1 square inch 645 mm 2 000 Btu 56 kW per total input rating of all equipment in the enclosure See figure 5 When ducts are used they shall be of the same cross sec tional area as the free area of the openings to which they connect The minimum dimension of rectangular air ducts shall be no less than 3 inches 75 mm In calculating free area
67. e blower motors are prelubricated for extended bearing life No further lubrication is needed AWARNING The blower access panel must be securely in place when the blower and burners are operating Gas fumes which could contain carbon monoxide can be drawn into living space resulting in personal inju ry or death Filters All SL280UHV filters are installed external to the unit Fil ters should be inspected monthly Clean or replace the fil ters when necessary to ensure that the furnace operates properly Replacement filters must be rated for high veloc ity airflow Table 1 lists recommended filter sizes Flue And Chimney 1 Check flue pipe chimney and all connections for tight ness and to make sure there is no blockage 2 Check unit for proper draft Electrical 1 Check all wiring for loose connections 2 Check for the correct voltage at the furnace furnace operating Correct voltage is 120VAC 10 3 Check amp draw on the blower motor with inner blow er panel in place Unit Nameplate Actual Cleaning the Heat Exchanger and Burners NOTE Use papers or protective covering in front of the fur nace during cleaning 1 Turn off both electrical and gas power supplies to fur nace 2 Remove flue pipe and top cap some applications top cap can remain from the unit 3 Label the wires from gas valve rollout switches prima ry limit switch and make up box then disconnect them 4 Remove the screws th
68. e switch to see if it is to the pressure switch opening stuck closed on heat call Check pressure inches w c of high pressure switch closing on heat call Measure operating pressure inches w c Inspect vent and combustion air inducer for correct opera tion and restriction Clears when heat call finishes successfully to flame failure diagnostics or field installed mode Clean or replace sensor Measure voltage of neutral to ground to en sure good unit ground Clears when heat call finish E273 Soft lockout Exceeded maximum number of recycles Last recycle due Check micro amperes of flame sensor using control es successfully failed due to the limit circuit opening or limit remained open longer than rate and air flow Check for blockage Clears when 3 minutes heat call finishes successfully E275 Softlockout Flame sensed out of sequence Flame signal is gone Shut off gas Check for gas valve leak 1 hour soft lockout Clears when flame has been proven stable 276 Watchguard calibration failure Unable to perform pressure switch calibration Check vent system and pressure switch wiring con E274 Soft lockout Exceeded maximum number of recycles Last recycle Shut down system 1 hour soft lockout Check firing nections 1 hour soft lockout Clears when calibra tion has finished successfully open or not within specifications 1 hour soft lock out Clears when flame has been proven stable E291 Heatair
69. ece as a cover plate to patch unused opening on cabinet UPFLOW POSITION Left Side Vent Discharge cover plat collector box rS 3 pressure switch vent pipe make up a lt jt s y 2 flue transition AIR FLOW Gas supply piping must be brought into the unit from the right side in order to accommodate the flue pipe Remove make up box assembly 2 screws and cut wire tie to free make up box wires Re install make up box on other side of cabinet Re secure make up box wires either pulling excess wires through the blower compartment and securing with supplied wire tie or coil excess wire and secure to the gas manifold FIGURE 16 UPFLOW POSITION Right Side Vent Discharge cover plate collector box 51 T T pressure e Switch 4 flue transition vent pipe Ma AIR t FLOW Pressure switch tubing may be too long Cut to fit then re attach to barbed fitting on pressure switch Tubing must not be allowed to sag FIGURE 17 Page 13 Horizontal Position HORIZONTAL LEFT POSITION Top Vent Discharge vent pipe lt gt pressure switch e 1 e flue gt transition E cover
70. ehumidification 0 i and de energizes D on a PRECISION MODE operates independent of a Y1 thermostat demand 24 Dehumidificati ee Jes when humidity is mum 7000 Dehumidinicatiori 1 On On On Demand High 70 thermostat will try to call ONLY pas m maintain room humidity setpoint by allowing the Jumpers at indoor unit with a single stage outdoor unit room space to maintain a With Condensing unit Cut W914 R to DS on SureLight control cooler room thermostat With Heat Pump Cut W914 R to DS amp W951 R to O on SureLight control setpoint Dave Lennox ComfortSense 7000 thermostat to use for this application Y2081 4 heat 2 cool Dehumidification blower speed is 7096 of COOL speed for all units In Precision mode ComfortSense9 7000 thermostat will maintain room temperature up to 2 F 1 2 C cooler than room setting Page 49 TABLE 19 OPERATING SEQUENCE SL280UHV Non Communicating Thermostat with Humidity Control Feature and Two Speed Outdoor Unit OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE Thermostat Demand Relative Humidity System S Compressor NO CALL FOR DEHUMIDIFICATION Normal Opera 24 x N 24 blower follow thermostat ormal Opera demand ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING BASIC MODE only active on a Y1 thermostat demand PRIRA c E On On Acceptable 24 70 ComfortSense 7000 lon thermostat energizes Y2 Dehumidification 0 wx and de energizes
71. ese instructions are intended as a general guide and do not supersede local codes in any way Consult authorities having jurisdiction before installation In addition to the requirements outlined previously the fol lowing general recommendations must be considered when installing a SL280UHV furnace Page 5 e Place the furnace as close to the center of the air dis tribution system as possible The furnace should also be located close to the chimney or vent termination point e Do not install the furnace where drafts might blow direct ly into it This could cause improper combustion and un safe operation e Do not block the furnace combustion air openings with clothing boxes doors etc Air is needed for proper combustion and safe unit operation e When the furnace is installed in an attic or other insu lated space keep insulation away from the furnace NOTE The Commonwealth of Massachusetts stipu lates these additional requirements e Gas furnaces shall be installed by a licensed plumb er or fitter only e The gas cock must be T handle type e When a furnace is installed in an attic the passage way to and service area surrounding the equipment shall be floored AWARNING Product contains fiberglass wool Disturbing the insulation in this product during installation maintenance or repair will expose you to fiberglass wool Breathing this may cause lung cancer Fiberglass wool is known to the State of Cal ifor
72. etween the bottom of the furnace and the platform to ensure that the furnace operates properly and safely The furnace is equipped with a removable bottom 20 X 25 X 1 panel to facilitate installation 508mm X635mm X 25mm Markings are provided on both sides of the furnace cabinet Cleanable Filter for installations that require side return air Cut the furnace 1 cabinet at the maximum dimensions shown on page 2 NOTE 60C and 60D units that require air volumes over 1800 cfm 850 L s must have one of the following x Return Air 1 Return air from single side with transition which will Plenum accommodate 20 x 25 x 1 in 508 x 635 x 25 mm clean able air filter Required to maintain proper air velocity See figure 8 2 Return air from single side with optional RAB Return Air Base See figure 9 Transition 3 Return air from bottom and one side 4 Return air from both sides 5 Return air from bottom FIGURE 8 Refer to Engineering Handbook for additional information Optional Return Air Base Upflow Applications Only For use with A B C and D cabinets FURNACE loss IF BASE 123 68 IS USED i Rn HB BaBEdEEEBU WITHOUT Maximum Minimum PES i IAQ CABINET 1 279 Maximum 1 4 RETURN AIR 1 Unit side return air 4 856 MEL PLENUM Opening Overall MUST
73. furnace operates at 60 Hz 5 Range 57 Hz to 63 Hz e furnace integrated control requires both correct polarity and proper ground Both polarity and proper grounding should be checked before attempting to op erate the furnace on either permanent or temporary power e Generator should have a wave form distortion of less than 596 THD total harmonic distortion Page 26 icomfort Touch Thermostat with SL280UHV icomfort Touch Thermostat with SL280UHV and Non Communicating Outdoor Unit and icomfort ENABLED Outdoor Unit icomfort Touch Thermostat icomfort Touch Thermostat icomfort Enabled SL280UHV Indoor Furnace icomfort Enabled SL280UHV Indoor Furnace Non Communicating Outdoor Air Conditioner icomfort Enabled Outdoor Air Conditioner or Heat Pump icomfort ENABLED icomfort SL280UHV ENABLED FURNACE SL280UHV FURNACE OPTIONAL DISCHARGE AIR SENSOR ow OPTIONAL DISCHARGE AIR SENSOR ES OPTIONAL OUTDOOR OPTIONAL AIR SENSOR OUTDOOR AIR SENSOR e _ icomfort Touch amp THERMOSTAT of gs S DISCHARGE AIR SENSOR icomfort Touch THERMOSTAT c SH GREEN QO OUTDOOR AIR SENSOR 2200 QQ QO OUTDOOR DISCHARGE AIR SENSOR AIR SENSOR a WHITE i4 YELLOW x RED vm WHITE i Venton S RED R icomfort ENABLED OUTDOOR AIR CONDITIONING OR HEAT PUMP UNIT INDOOR EQUIPMENT
74. gas valve must be disconnected and isolated See figure 27 Gas ACAUTION valves can be damaged if subjected to pressures greater than 1 2 psig 3 48 kPa 14 inches w c Some soaps used for leak detection are corrosive to MANUAL MAIN ISOLATE certain metals Carefully rinse piping thoroughly af SHUT OFF VALVE GAS VALVE ter leak test has been completed Do not use matches candles flame or other sources of ignition to check for gas leaks The furnace must be isolated by closing its individual manual shut off valve and disconnecting from from the gas WILL NOT HOLD NORMAL TEST FURNACE PRESSURE 1 8 NPT PLUG CAP FIGURE 27 Page 24 ELECTROSTATIC DISCHARGE ESD Precautions and Procedures 4 CAUTION Electrostatic discharge can affect elec tronic components Take precautions to neutralize electrostatic charge by touching your hand and tools to metal prior to handling the control The unit is equipped with a field make up box on the left hand side of the cabinet The make up box may be moved to the right side of the furnace to facilitate installation If the make up box is moved to the right side clip the wire ties that bundle the wires together The excess wire must be pulled into the blower compartment Secure the excess wire to the existing harness to protect it from damage INTERIOR MAKE UP BOX INSTALLATION Leftside To FIGURE 28 INTERI
75. hat may result in unsafe operation For instance items innocently stored next to the furnace may obstruct the combustion air supply This could cause incomplete combustion and the production of carbon monoxide gas Repair Parts List The following repair parts are available through independent Lennox dealers When ordering parts include the complete furnace model number listed on the CSA International nameplate Example SL280UH070V364A All service must be performed by a licensed professional installer or equivalent service agency or gas supplier Cabinet Parts Upper access panel Blower panel Top cap Control Panel Parts Transformer Two stage variable speed integrated control Door interlock switch Circuit breaker Blower Parts Blower wheel Blower housing Motor Motor electronics Power choke 1 hp only Motor mounting frame Motor capacitor Blower housing cutoff plate Heating Parts Flame Sensor Heat exchanger assembly Gas manifold Two speed combustion air inducer Two stage gas valve Main burner cluster Main burner orifices Pressure switch Ignitor Primary limit control Flame rollout switch Secondary limit Page 59 Integrated Control Diagnostic Modes Display Action when button released No change idle Remain in idle mode Solid E Enter diagnostic recall mode Solid D Discharge Air Installed Solid F Enter flame signal mode Solid P variable speed only Program unit capacity size Unit Code No
76. he factory Mounting Screws Location mounting screws mounting screw FIGURE 14 UPFlow Position UPFLOW POSITION Top Vent Discharge vent pipe flue transition pressure switch make up box d collector box q AIR FLOW FIGURE 15 AIMPORTANT The unit will not vent properly with the flue transition pointed down in the 6 o clock position The combustion air inducer may be rotated clock wise or counterclockwise by 90 to allow for top or side vent discharge in all applications When the unit is installed the flue transition must be in the 9 o clock 12 o clock or 3 o clock position If necessary reposition the combustion air inducer pres sure switch and or make up box as needed per the follow ing steps and see figures 15 through 21 1 Remove the four mounting screws figure 14 which secure the combustion air inducer pressure switch assembly to the orifice plate Lift and rotate the assem bly 90 degrees clockwise or counter clockwise to either the 3 o clock position or to 9 o clock position and re se cure with four screws Gasket should be left in place 2 Use tin snips to cut preferred opening on the cabinet for repositioning the flue outlet Use the cut out pi
77. hreaded plug on the inlet side of the gas valve provides access to the supply pressure tap Remove the threaded plug install a field provided barbed fitting and connect a manometer to measure supply pressure See table 22 for supply line pressure Replace the threaded plug after mea surements have been taken Manifold Pressure NOTE Pressure test adapter kit 10L34 is available from Lennox to facilitate manifold pressure measurement 1 Connect test gauge to manifold pressure post figure 35 or tap figure 36 on gas valve 2 Ignite unit on high fire and let run for 5 minutes to allow for steady state conditions 3 After allowing unit to stabilize for 5 minutes record manifold pressure and compare to value given in table 22 4 If necessary make adjustments Figures 35 and 36 show location of high fire adjustment screw 5 If an adjustment is made on high fire re check man ifold pressure on low fire Do not adjust low fire man ifold pressure low fire manifold pressure is more than 1 2 above or below value specified in table 22 replace valve Proper Combustion Furnace should operate minimum 15 minutes with correct manifold pressure and gas flow rate before checking com bustion Table 21 shows acceptable combustion for ALL SL280UHV models The maximum carbon monoxide read ing should not exceed 50 ppm TABLE 21 High Fire 6 8 7 4 7 5 9 0 42 57 50 60 Page 52 High Altitude The manifold pres
78. igh heat Conventional thermostat 30 seconds icomfort Touch thermostat set for 30 adjustable 15 to 45 seconds FIGURE 37 HEATING OPERATION WITH SINGLE STAGE THERMOSTAT 15 35 39 on Pre Purge Ignitor Warm up Trial ma 5 SEC Post off blower blower on delay OFF Ignition heat demand low speed CAI ignitor low fire gas valve indoor blower low heat 30 Purge delay 7 or 12 minutes after heating demand begins furnace switches to high fire depends on settin high speed CAI high fire gas valve indoor blower high heat Conventional thermostat 30 seconds icomfort Touch thermostat set for 30 adjustable 15 to 45 seconds FIGURE 38 Page 55 A WARNING ELECTRICAL SHOCK FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in dangerous operation serious injury death or property damage Improper servicing could result in dangerous opera tion serious injury death or property damage Before servicing disconnect all electrical power to furnace When servicing controls label all wires prior to dis connecting Take care to reconnect wires correctly Verify proper operation after servicing At the beginning of each heating season a qualified techni cian should check the system as follows Blower Check the blower wheel for debris and clean if necessary Th
79. ing test while each appliance is operat ing and the other appliances which are not operating re main connected to the common venting system If the venting system has been installed improperly you must correct the system as indicated in the general venting re quirements section WARNING CARBON MONOXIDE POISONING HAZARD Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon mon oxide poisoning or death The following steps shall be followed for each ap pliance connected to the venting system being placed into operation while all other appliances connected to the venting system are not in operation 1 Seal any unused openings in the common venting sys tem 2 Inspect the venting system for proper size and horizontal pitch Determine that there is no blockage restriction leakage corrosion or other deficiencies which could cause an unsafe condition 3 Close all building doors and windows and all doors be tween the space in which the appliances remaining connected to the common venting system are located and other spaces of the building Turn on clothes dry ers and any appliances not connected to the common venting system Turn on any exhaust fans such as range hoods and bathroom exhausts so they will oper ate at maximum speed Do not operate a summer ex haust fan Close fireplace dampers 4 Follow the lighting instru
80. ional Fuel Gas Code ANSI Z223 1 This reprinted material is not the complete and official posi tion of the ANSI on the referenced subject which is repre sented only by the standard in its entirety ACAUTION Do not install the furnace in a corrosive or contami nated atmosphere Meet all combustion and ventila tion air requirements as well as all local codes ACAUTION Insufficient combustion air can cause headaches nausea dizziness or asphyxiation It will also cause excess water in the heat exchanger resulting in rust ing and premature heat exchanger failure Excessive exposure to contaminated combustion air will result in safety and performance related problems Avoid exposure to the following substances in the combus tion air supply Permanent wave solutions Chlorinated waxes and cleaners Chlorine base swimming pool chemicals Water softening chemicals De icing salts or chemicals Carbon tetrachloride Halogen type refrigerants Cleaning solvents such as perchloroethylene Printing inks paint removers varnishes etc Hydrochloric acid Cements and glues Antistatic fabric softeners for clothes dryers Masonry acid washing materials All gas fired appliances require air for the combustion pro cess If sufficient combustion air is not available the fur nace or other appliances will operate inefficiently and un safely Enough air must be provided to meet the needs of all fuel burning appliances and appliance
81. itch settings on the furnace control Refer to Installation Instructions for specific DIP Switch NOTES The effect of static pressure is included in air volumes shown First stage HEAT is approximately 91 of the same second stage HEAT First stage COOL two stage air conditioning units only is approximately 7096 of the same second stage COOL speed position Continuous Fan Only speed is selectable at 28 38 70 and 100 of the selected second stage cooling speed minimum 500 cfm Lennox Harmony III Zone Control Applications Minimum blower speed is 455 cfm Page 40 BLOWER DATA SL280UH090V48B BLOWER PERFORMANCE less filter BOTTOM RETURN AIR 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1280 1410 18 1220 1340 12 1155 1270 6 1095 1205 Factory Default 1035 1195 6 970 1070 12 910 1000 18 845 930 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm po Low Medium Low Medium High High Low Medium Low Medium High High 670 890 1040 1210 1030 1335 1550 1755 Factory Default 605 815 965 1090 940 1205 1405 1 600 525 690 850 985 795 1060 1260 1435 SINGLE SIDE RETURN AIR 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling Externa
82. l Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1280 1410 18 1220 1340 12 1155 1270 6 1095 1205 Factory Default 1035 1195 6 970 1070 12 910 1000 18 845 930 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm Low Medium Low Medium High High Low Medium Low Medium High High 640 900 1015 1175 1005 1295 1500 1670 Factory Default 570 780 930 1040 895 1160 1345 1500 530 700 810 955 795 1050 1210 1405 1 Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control Refer to Installation Instructions for specific DIP Switch Settings Factory default setting NOTES The effect of static pressure is included in air volumes shown First stage HEAT is approximately 9196 of the same second stage HEAT First stage COOL two stage air conditioning units only is approximately 7096 of the same second stage COOL speed position Continuous Fan Only speed is selectable at 28 38 70 and 100 of the selected second stage cooling speed minimum 500 cfm Lennox Harmony III Zone Control Applications Minimum blower speed is 455 cfm Page 41 BLOWER DATA SL280UH090V48B BLOWER PERFORMANCE less filter SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE 0 through 0 8 in w g Heating and 0 through
83. l operation first stage cooling blower speed is 70 COOL speed Dehumidification blower speed is reduced to 70 of COOL In Precision mode ComfortSense 7000 thermostat will maintain room temperature up to 2 F 1 2 C cooler than room setting Page 50 Unit Start Up FOR YOUR SAFETY READ BEFORE LIGHTING AWARNING Do not use this furnace if any part has been underwa ter Immediately call a licensed professional service technician or equivalent to inspect the furnace and to replace any part of the control system and any gas control which has been under water AWARNING If overheating occurs or if gas supply fails to shut off shut off the manual gas valve to the appliance before shutting off electrical supply A CAUTION Before attempting to perform any service or mainte nance turn the electrical power to unit OFF at dis connect switch AWARNING During blower operation the ECM motor emits ener gy that may interfere with pacemaker operation In terference is reduced by both the sheet metal cabinet and distance BEFORE LIGHTING smell all around the appliance area for gas Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor The gas valve on the SL280UHV unit will be equipped with a gas control switch Use only your hand to move the switch Never use tools If the switch will not turn or if the control switch will not move by hand do not try to repair
84. learances Bottom Vent Connector pow pue Front 2 1 4 in 57 mm 2 14 in 57 mm om m s _ Front clearance in alcove installation must be 24 in 610 mm Maintain a minimum of 24 in 610 mm for front service access 3 1 4 in if single wall vent pipe is used For installations on a combustible floor do not install the furnace directly on carpeting tile or other combustible materials other than wood flooring FIGURE 11 Horizontal Applications The SL280UHV furnace can be installed in horizontal ap plications Order kit number 51W10 or use equivalent from Lennox Allow for clearances to combustible materials as indicated on the unit nameplate Minimum clearances for closet or al cove installations are shown in figure 11 This furnace may be installed in either an attic or a crawl space Either suspend the furnace from roof rafters or floor joists as shown in figure 12 or install the furnace on a platform as shown in figure 13 Typical Horizontal Application Unit Suspended in Attic or Crawlspace Bracket 3 16 inch FIGURE 12 NOTE Heavy gauge perforated sheet metal straps may be used to suspend the unit from roof rafters or ceiling joists When straps are used to suspend the unit in this way support must be provided for both the ends The straps must not interfere with the plenum or exhaust pip ing installation Cooling coils and supply and return air plen
85. least one drafthood equipped appliance The vent connectors and chimney are sized according to the provided venting tables If type B1 double wall vent is used inside a chimney no oth er appliance can be vented into the chimney The outer wall of type B1 vent pipe must not be exposed to flue products A type B1 vent or masonry chimney liner shall terminate above the roof surface with a listed cap or a listed roof as sembly according to the terms of their respective listings and the vent manufacturer s instructions When inspection reveals that an existing chimney is not safe for the intended purpose it shall be rebuilt to conform to nationally recognized standards lined or relined with suitable materials or replaced with a gas vent or chimney suitable for venting SL280UHV series units The chimney passageway must be checked periodically to ensure that it is clear and free of obstructions Do not install a manual damper barometric draft regulator or flue restrictor between the furnace and the chimney Never connect a Category appliance to a chimney that is servicing a solid fuel appliance If a fireplace chimney flue is used to vent this appliance the fireplace opening must be permanently sealed A type B or listed chimney lining system that passes through an unused masonry chimney flue is not considered to be exposed to the outdoors General Venting Requirements Vent all SL280UHV furnaces according to these instruc tions
86. lled so that the burner s and the ignition source are located no less than 18 inches 457 mm above the floor The furnace must be located or protected to avoid physical damage by vehicles When a furnace is installed in a public garage hangar or other building that has a haz ardous atmosphere the furnace must be installed accord ing to recommended good practice requirements and cur rent National Fuel Gas Code Page 4 Temperature Rise NOTE Furnace must be adjusted to obtain a temperature rise high and low fire within the range s specified on the unit nameplate Failure to do so may cause erratic limit operation and may result in premature heat exchanger failure This SL280UHV furnace must be installed so that its elec trical components are protected from water Installed in Combination with a Cooling Coil When this furnace is used with cooling units it shall be installed in parallel with or on the upstream side of cooling units to avoid condensation in the heating compartment See figure 1 With a parallel flow arrangement a damper or other means to control the flow of air must adequately pre vent chilled air from entering the furnace If the damper is manually operated it must be equipped to prevent operation of either the heating or the cooling unit unless it is in the full HEAT or COOL setting See figure 1 Heating Unit Installed Parallell to Air Handler Unit Dampers open during heating operation only le
87. lll OUTLET AIR INLET AIR NOTE Each air duct opening shall have a free area of at least one square inch 645 mm per 2 000 Btu 59 kW per hour of the total input rating of all equipment in the enclosure If the equipment room is located against an outside wall and the air openings communicate directly with the outdoors each open ing shall have a free area of at least one square inch 645 mm per 4 000 Btu 1 17 kW per hour of the total input rating of all other equipment in the enclosure FIGURE 5 Page 8 Setting Equipment AWARNING Do not install the furnace on its front or its back Do not connect the return air ducts to the back of the fur nace Doing so will adversely affect the operation d the safety control devices which could result in per sonal injury or death The SL280UHV gas furnace can be installed as shipped in either the upflow position or the horizontal position Select alocation that allows for the required clearances that are listed on the unit nameplate Also consider gas supply connections electrical supply vent connection and installation and service clearances 24 inches 610 mm at unit front The unit must be level NOTE Units with 1 2 hp blower motors are equipped with three flexible legs and one rigid leg See figure 6 The rigid leg is equipped with a shipping bolt and a flat white plastic washer rather than the rubber mounting grommet used with a flexible mounting leg The bolt and w
88. mly attached to the furnace flue collar by self drilling screws or other approved means except vent connectors of listed type B vent material which shall be assembled according to the manufacturer s instructions Joints between sections of single wall connector piping shall be fastened by Screws or other approved means 13 When the vent connector used for Category ap pliances must be located in or pass through a crawl space attic or other areas which may be cold that por tion of the vent connector shall be constructed of listed double wall type B vent material or material having equivalent insulation qualities 14 All venting pipe passing through floors walls and ceil ings must be installed with the listed clearance to com bustible materials and be fire stopped according to lo cal codes In absence of local codes refer to NFGC 2223 1 15 No portion of the venting system can extend into pass through any circulation air duct or plenum 16 Vent connectors serving Category appliances shall not be connected to any portion of mechanical draft systems operating under positive pressure such as Category III or IV venting systems 17 If vent connectors are combined prior to entering the common vent the maximum common vent capacity listed in the common venting tables must be reduced by 1096 the equivalent of one 90 elbow 0 90 x maximum common vent capacity 18 The common vent diameter must always be at least a
89. nel must always be in place when the furnace is operat ing and it must not allow leaks into the supply air duct sys tem Return Air Plenum NOTE Return air must not be drawn from a room where this furnace or any other gas fueled appliance i e water heater or carbon monoxide producing de vice i e wood fireplace is installed When return air is drawn from a room a negative pres sure is created in the room If a gas appliance is operating in a room with negative pressure the flue products can be pulled back down the vent pipe and into the room This reverse flow of the flue gas may result in incomplete com bustion and the formation of carbon monoxide gas This toxic gas might then be distributed throughout the house by the furnace duct system In upflow applications the return air can be brought in through the bottom or either side of the furnace If a fur nace with bottom return air is installed on a platform make an airtight seal between the bottom of the furnace and the platform to ensure that the unit operates properly and safely Use fiberglass sealing strips caulking or equiva lent sealing method between the plenum and the furnace cabinet to ensure a tight seal If a filter is installed size the return air duct to fit the filter frame Page 12 A 4 inch diameter flue transition is factory installed on the combustion air inducer outlet of all models Figure 15 shows the combustion air inducer as shipped from t
90. ng MANUAL Standard AUTOMATIC AIN SHUT OFF MANUAL GAS VALVE VALVE MAIN SHUT OFF With 1 8 in NPT VALVE a AUTOMATIC Plugged Tap With 1 8 in NPT GAS VALVE Shown Plugged Tap Shown GROUND JOINT UNION DRIP LEG lt Di GROUND JOINT UNION Chm __ 6 Right Side Piping PROVIDED Alternate DRIP LEG AND INSTALLED EE UI S NOTE BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET FIGURE 25 Horizontal Applications Possible Gas Piping Configurations MANUAL MAIN SHUT OFF valve MANUAL MAIN SHUT OFF C GROUND JOINT UNION Horizontal Application Left Side Air Discharge GROUND JOINT UNION a DRIP LEG DRIP LEG MANUAL mm MAIN SHUT OFF L lt VALVE FIELD PROVIDED GROUND INSTALLED JOINT Horizontal Application w Right Side Air Discharge NOTE BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET DRIP LEG FIGURE 26 Leak Check supply system the during any pressure testing of the gas After gas piping is completed carefully check all piping supply system at pressures less than or equal to 1 2 psig connections factory and field installed for gas leaks Use 3 48 kPa 14 inches w c a leak detecting solution or other preferred means NOTE If emergency shutoff is necessary shut off the main manual gas valve and disconnect the main power to the furnace The installer should properly label these devices When testing pressure of gas lines
91. nia to cause cancer Fiberglass wool may also cause respiratory skin and eye irritation To reduce exposure to this substance or for further information consult material safety data sheets available from address shown below or contact your supervisor Lennox Industries Inc P O Box 799900 Dallas TX 75379 9900 Combustion Dilution amp Ventilation Air In the past there was no problem in bringing in sufficient out door air for combustion Infiltration provided all the air that was needed In today s homes tight construction practices make it necessary to bring in air from outside for combus tion Take into account that exhaust fans appliance vents chimneys and fireplaces force additional air that could be used for combustion out of the house Unless outside air is brought into the house for combustion negative pressure outside pressure is greater than inside pressure will build to the point that a downdraft can occur in the furnace vent pipe or chimney As a result combustion gases enter the liv ing space creating a potentially dangerous situation In the absence of local codes concerning air for combus tion and ventilation use the guidelines and procedures in this section to install SL280UHV furnaces to ensure effi cient and safe operation You must consider combustion air needs and requirements for exhaust vents and gas piping A portion of this information has been reprinted with per mission from the Nat
92. nit is shipped ready for installation in the upflow or horizontal position left or right The furnace is shipped with the bottom panel in place The bottom pan el must be removed if the unit is to be installed in a horizon tal application The panel may also be removed in upflow applications Shipping and Packing List Package 1 of 1 contains 1 Assembled SL280UHV unit 1 Bag assembly containing the following 2 Screws 1 Snap bushing 1 Snap plug 1 Wire tie 1 Vent warning label 1 Owner s manual and warranty card The following items may be ordered separately 1 Thermostat 1 Suspension Kit for horizontal installations 1 Propane LP changeover kit 1 Return air base 1 High altitude kit 1 Side filter kit Check equipment for shipping damage If you find any damage immediately contact the last carrier Safety Information DANGER Danger of explosion There are circumstances in which odorant used with LP propane gas can lose its scent In case of a leak LP propane gas will settle close to the floor and may be difficult to smell An LP propane leak detector should be installed in all LP applications AWARNING Improper installation adjustment alteration service or maintenance can cause property damage person al injury or loss of life Installation and service must be performed by a licensed professional installer or equivalent service agency or the gas supplier A CAUTION As with
93. ns An additional transformer for UV light icomfort Touch applications is required THERMOSTAT icomfort ENABLED OUTDOOR AIR CONDITIONING OR HEAT PUMP UNIT DEHUMIDIFIER CONTROL ENABLED o L SL280UHV FURNACE OUTDOOR UNIT icomfort CONDENSATE overrLow POWER COMPANY INTERRUPTION SYSTEMS HCWH 2 420vAC ARE WIRED SAME AS OVERFLOW SWITCH AUXILIARY made DEHUMIDIFIER OVAH 2 L HVAC EQUIPMENT 4989 JO JH HEPA BYPASS FILTER X2680 HEPA INTERLOCK KIT STANDARD 1 OR2 gt PASS INDOOR BLOWER STAGE AC OR HP UNIT MOTOR COMMON WIRE THROUGH CURRENT LOOP SEE HEPA INTERLOCK KIT NON COMMUNICATING FOR INSTALLATION DE CONDENSATE SYSTEM WIRING TAILS OVERFLOW SWITCH ENABLED SL280UHV FURNACE icomfort OTHER OUTDOOR CONNECTIONS REMAIN THE SAME REFER TO LVCS VENTILATION CONTROL SYSTEM SPECIFIC DIAGRAM SEE LVCS VENTILATION NSTRUCTIONS FOR DAMPER amp SENSOR WIRING 26L56 CURRENT 2 STAGE FURNACE SENSING RELAY KIT S ee ENABLED DOS los lt Le COMMUNICATING 2 oi
94. nsed out of sequence Flame still present Shut off gas Check for gas valve leak Replace if necessary Alert clears when fault is recovered E250 Limit switch circuit open Refer to troubleshooting Check for proper firing rate on furnace Ensure there is no blockage in heater Check for proper air 240 Low flame current Run mode Refer to troubleshooting See Page 68 Check micro amperes of flame sensor using control flow If limit not closed within 3 minutes unit will go into 1 hour soft lockout Resumes normal operation after fault is cleared E252 Discharge air temperature too high gas heat only Check temperature rise air flow and input rate Cleared when heat call is finished E270 Soft lockout Exceeded maximum number of retries No flame current Check for proper gas flow Ensure that ignitor is sensed lighting burner Check flame sensor current Clears when heat call finishes successfully to the pressure switch opening closing on heat call Measure operating pressure inches w c Inspect vent and combustion air in ducer for correct operation and restriction Clears 271 Soft lockout Exceeded maximum number of retries Last retry failed due Check pressure inches w c of low pressure switch when heat call finishes successfully Page 63 Integrated Control Diagnostic Codes continued E272 Softlockout Exceeded maximum number of recycles Last recycle due Check operation of low pressur
95. op Vent Discharge vent pipe flue 4 pressure switch cover plate collector box e make up box Gas supply piping must be brought into the unit from the bottom in order to accommodate the flue pipe Remove make up box assembly 2 screws and cut wire tie to free make up box wires Re install make up box on other side of cabinet Re secure make up box wires by either pulling excess wires through the blower compartment and securing with supplied wire tie or coil excess wire and secure to the gas manifold FIGURE 20 HORIZONTAL RIGHT POSITION Side Vent Discharge pressure switch 8 AP o sats amp D 2 flue transition collecto box make up box The SL280UHV series units are classified as fan assisted Category furnaces when vertically vented according to the latest edition of National Fuel Gas Code NFPA 54 ANSI Z223 1 in the USA A fan assisted Category fur nace is an appliance equipped with an integral mechanical means to either draw or force combustion products through the combustion chamber and or heat exchanger The SL280UHV is not approved for use with horizontal venting NOTE Use these instructions as a guide They do not su persede local codes This furnace must be vented accord ing to all local codes these installation instructions and the provided venting tables in these instructions The venting tables
96. or Switches 14 and 15 Continuous Blower Speed Table 17 provides continuous blower speed adjustments that will result from different switch settings TABLE 17 Continuous Blower Speed Continuous Blower Speed 28 of High Cool Speed 3896 of High Cool Speed Factory 7096 of High Cool Speed 10096 of High Cool Speed Page 37 On Board Links Note In icomfort systems with a conventional outdoor unit non communicating the on board clippable links must be set to properly configure the system AWARNING Carefully review all configuration information pro vided Failure to properly set DIP switches jumpers and on board links can result in improper operation On Board Link W914 Dehum or Harmony R to DS On board link W914 is a clippable connection between ter minals R and DS on the integrated control W914 must be cut when the furnace is installed with either the Harmony IIl zone control or a thermostat which features humidity control If the link is left intact the PMW signal from the Har mony III control will be blocked and also lead to control damage Refer to table 18 for operation sequence in ap plications including SL280UHV a thermostat which fea tures humidity control and a single speed outdoor unit Table 19 gives the operation sequence in applications with a two speed outdoor unit On Board Link W951 Heat Pump R to O On board link W951 is a clippable connection between ter minals R and
97. ow Medium Low Medium High High 1035 1105 1285 1610 1530 1610 1825 2240 Factory Default 955 1005 1145 1430 1365 1450 1650 2040 860 935 1050 1295 1225 1310 1515 1850 Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control Refer to Installation Instructions for specific DIP Switch Settings Factory default setting NOTES The effect of static pressure is included in air volumes shown First stage HEAT is approximately 91 of the same second stage HEAT First stage COOL two stage air conditioning units only is approximately 7096 of the same second stage COOL speed position Continuous Fan Only speed is selectable at 28 38 70 and 100 of the selected second stage cooling speed minimum 500 cfm Lennox Harmony III Zone Control Applications Minimum blower speed is 495 cfm Page 48 TABLE 18 OPERATING SEQUENCE SL280UHV Non Communicating Thermostat with Humidity Control Feature and Single Speed Outdoor Unit OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE Thermostat Demand Demand Relative Relative Humidity seins sep E T TT 3 Comments Condition Y1 Status sor NO CALL FOR DEHUMIDIFICATION 24 Compressor and indoor Normal Operation 1 On Acceptable VAC High 100 blower follow thermostat demand BASIC MODE only active on a Y1 thermostat demand Normal Operation 1 On On Acceptable AC High 10096 ComfortSense 7000 thermostat energizes Y1 D
98. placed filters will dam age the unit SL280UHV units be used for heating of buildings structures under construction if the following conditions are met e The vent system must be permanently installed per these installation instructions e A room thermostat must control the furnace The use of fixed jumpers that will provide continuous heating is not allowed e The return air duct must be provided and sealed to the furnace e Return air temperature range between 60 F 16 C and 80 F 27 C must be maintained e Air filters must be installed in the system and must be maintained during construction e Air filters must be replaced upon construction comple tion e The input rate and temperature rise must be set per the furnace rating plate e One hundred percent 10096 outdoor air must be pro vided for combustion air requirements during construc tion Temporary ducting may supply outdoor air to the furnace Do not connect duct directly to the furnace Size the temporary duct following these instructions in section for Combustion Dilution and Ventilation Air in a confined space with air from outside e The furnace heat exchanger components duct system air filters and evaporator coils must be thoroughly cleaned following final construction clean up e All furnace operating conditions including ignition in put rate temperature rise and venting must be verified according to these installation instructions Th
99. pressure Page 68 Switch closing on heat call Measure operating pres sure inches w c Inspect vent and combustion air inducer for correct operation and restriction Re sumes normal operation after fault is cleared Page 68 heat call Measure operating pressure inches w c Inspect vent and combustion air inducer for correct operation and restriction Resumes normal opera E226 High pressure switch failed closed Refer to troubleshooting See Check operation of high pressure switch closing on tion after fault is cleared troubleshooting See Page 68 closing on heat call Measure operating pressure inches w c Inspect vent and combustion air in ducer for correct operation and restriction Re 227 Low pressure switch open during trial for ignition or run mode Refer to Check pressure inches w c of low pressure switch sumes normal operation after fault is cleared 228 Combustion air inducer calibration failure Unable to perform pressure switch calibration Check vent system and pressure switch wiring con nections Resumes normal operation after fault is cleared E229 Ignition on high fire IFC switched to high fire ignition because low fire pressure switch did not close in allowed time No action is needed diagnostics or field installed mode Clean or replace sensor Measure voltage of neutral to ground to en sure good unit ground Alert clears after current heat call has been completed 241 Flame se
100. r fault recovered E 200 Hard lockout Rollout circuit open or previously open Correct cause of rollout trip or replace flame rollout Switch Test furnace operation Cleared after fault recovered E201 Indoor blower communication failure Unable to communicate with blow Indoor blower communication failure including pow er motor er outage Lost communication with indoor blower motor Possible causes motor not powered loose wiring Problem may be on control or motor side Cleared after fault recovered Furnace Air Handler on configuration guide or in installation instructions Cleared after the correct match is detected following a reset Remove ther mostat from system while applying power and re programming 203 Appliance capacity size is NOT programmed Invalid unit codes refer to No appliance capacity code selected Check for 202 Indoor blower motor mis match Indoor motor horsepower does not Incorrect appliance capacity code selected Check match unit capacity See Page 67 for proper configuring under Unit Size Codes for configuration flow chart See Page 67 proper configuring under Unit Size Codes for Fur nace on configuration guide or in installation instruc tions Critical Alert Cleared after valid unit code is read following a reset Remove thermostat from system while applying power and reprogramming E 204 Gas valve mis wired Check gas valve operation and wiring Clears when repaired
101. re problem on the control Cycle power on control Replace if problem prevents service and is persistent Cleared 300 seconds after fault recov ered Page 61 Integrated Control Diagnostic Codes continued E 131 Corrupted control parameters Verify configuration of system Communi Reconfigure the system Replace control if heating cating only or cooling is not available Only applicable in the communicating mode not in startup Exit from Com missioning and Execute Set Factory Default mode Control will still operate on default parameter set tings E 180 Outdoor air temperature sensor failure Only shown if shorted or out of Compare outdoor sensor resistance to temperature range resistance charts in unit installation instructions Replace sensor pack if necessary At beginning of any configuration furnace or air handler control will sense outdoor air and discharge air temperature ate feature will be set as installed and that could sensor s If detected reading in range appropri be seen in About screen In normal operation after control recognizes sensors alarm will be sent if valid temperature reading is lost To get rid of set ting and alarm redo configuration and make sure that temperature sensor is marked as not installed in Indoor Unit About screen When Indoor unit con trol is replaced thermostat will tell new control if temperature sensor is in system or not Clears 30 seconds afte
102. ressed a second time while c is flashing to confirm command to delete codes Press the button until a solid is displayed to exit the Error Code Recall mode Flame Signal Mode Select F from the menu to access the flame signal mode The integrated control will display the flame current on 7 segment LED in in micro amps uA Flame signal mode is exited after the following e Power is reset e Pressing and holding push button until 3 horizontal lines are displayed e 10 minutes of entering the flame sense mode Page 38 BLOWER DATA SL280UH070V36A BLOWER PERFORMANCE less filter BOTTOM RETURN AIR 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1045 1145 18 985 1080 12 940 1035 6 880 960 Factory Default 850 925 6 785 875 12 745 815 18 680 745 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm Seti Low Medium Low Medium High 2 High Low Medium Low Medium High High 781 819 872 981 1045 1139 1219 1372 Factory Default 695 734 797 883 943 1005 1114 1260 _ 645 674 720 815 847 922 991 1144 SINGLE SIDE RETURN AIR 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range HEATING Hea
103. s large as the largest vent connector diameter 19 In no case shall the vent connector be sized more than two consecutive table size diameters over the size of the draft hood outlet or flue collar outlet 20 Do not install a manual damper barometric draft regu lator or flue restrictor between the furnace and the chimney 21 When connecting this appliance to an existing dedi cated or common venting system you must inspect the venting system s general condition and look for signs of corrosion The existing vent pipe size must conform to these instructions and the provided venting tables If the existing venting system does not meet these re quirements it must be resized Page 17 TABLE 3 Capacity of Type B Double Wall Vents with Type B Double Wall Connectors Serving a Single Category Appliance Vent and Connector Diameter D inches omn J Appliance Input Rating in Thousands of Btu Per Hour 0 78 dp D9 cp nef cape cero a mis see pos wer worn oes mcm ii s CELERE 0 2 E a am 20 ges 2 92 ipo c SEE cw ee 2255 4 6 er 175 Ls 99959 288 ee 0 10 T 491 0 um 32 502 Cas ae 12 2 E E E
104. s are based on a combination of DIP switch settings on the furnace control Refer to Installation Instructions for specific DIP Switch Settings 2 Factory default setting NOTES The effect of static pressure is included in air volumes shown First stage HEAT is approximately 91 of the same second stage HEAT First stage COOL two stage air conditioning units only is approximately 70 of the same second stage COOL speed position Continuous Fan Only speed is selectable at 28 38 70 and 100 of the selected second stage cooling speed minimum 500 cfm Lennox Harmony III Zone Control Applications Minimum blower speed is 480 cfm Page 43 BLOWER DATA SL280UH090V60C BLOWER PERFORMANCE less filter SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1360 1495 18 1290 1420 12 1225 1350 6 1160 1275 Factory Default 1095 1205 6 1030 1130 12 965 1060 18 900 990 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm po Low Medium Low Medium High 2 High Low Medium Low Medium High High 1050 1190 1380 1615 1515 1715 1930 2240 Factory Default 970 1090 1245 1485 1380 1560 1755 2070 880 985 1095 1285 1215 1400 1580 1830 Cooling
105. s such as exhaust fans which force air out of the house When fireplaces ex haust fans or clothes dryers are used at the same time as the furnace much more air is necessary to ensure proper combustion and to prevent a downdraft Insufficient air causes incomplete combustion which can result in carbon monoxide In addition to providing combustion air fresh outdoor air dilutes contaminants in the indoor air These contami nants may include bleaches adhesives detergents sol vents and other contaminants which can corrode furnace components The requirements for providing air for combustion and ven tilation depend largely on whether the furnace is installed in an unconfined or a confined space Page 6 Unconfined Space An unconfined space is an area such as a basement or large equipment room with a volume greater than 50 cubic feet 1 42 m3 per 1 000 Btu 29 kW per hour of the com bined input rating of all appliances installed in that space This space also includes adjacent rooms which are not separated by a door Though an area may appear to be un confined it might be necessary to bring in outdoor air for combustion if the structure does not provide enough air by infiltration If the furnace is located in a building of tight construction with weather stripping and caulking around the windows and doors follow the procedures in the air from outside section Confined Space A confined space is an area with a volume less than 5
106. sage errors In most cases errors are System related to electrical noise Make sure high voltage power is separated from RSBus Check for mis wired and or loose connections between the stat indoor unit and outdoor unit Check for a high volt age source of noise close to the system Fault clears after communication is restored E 110 Low line voltage Line Voltage Low Voltage lower than nameplate rating Check power line voltage and correct Alarm clears 5 seconds after fault recovered E111 Line voltage polarity reversed Reverse line power voltage wiring System resumes normal operation 5 seconds after fault recovered Ground not detected System shuts down Provide proper earth ground System resumes normal operation 5 seconds after fault recovered 113 High line voltage Line Voltage High Voltage higher than nameplate rating Provide power voltage within proper range System resumes normal operation 5 seconds after fault recovered E 114 Line voltage frequency out of range No 60 Hertz Power Check voltage and line power frequency Correct voltage and frequency problems System resumes normal operation 5 seconds after fault recovered 115 Low 24V Control will restart if the error recovers 24 Volt Power Low Range is 18 to 30 volts Check and correct voltage Check for additional power rob bing equipment connected to system May require installation of larger VA transformer to be installed in furnace air
107. stat Selection ACAUTION Field wiring for both communicating and non com municating applications is illustrated in diagrams which begin on Page 27 Non Communicating In non communicating applications the SL280UHV is de signed to operate in a SINGLE STAGE mode or TWO STAGE mode using a conventional thermostat For optimal performance in non communicating applica tions Lennox recommends use of a ComfortSense 7000 high quality electronic digital thermostat or any other with adjustable settings for 1st stage 2nd stage on off differen tials and adjustable stage timers Lennox recommends the following two stage thermostat settings First heat stage differential set to 1 2 to 1 degree F second heat stage differential set to 1 2 or 1 degree F second heat stage upstage timer disabled or set to maximum 1 hr mini mum Communicating In communicating applications the icomfort Touch ther mostat must be used Refer to the instructions provided with the thermostat for installation set up and operation In communicating system all unused thermostat wire in the wire bundle needs to be terminated inside and out The ex tra wires can terminate on the C terminal of the icomfort communication terminal strip RSBus Using an addition al wire come off C terminal and wire nut all the extra wires together Termination on the outdoor control must match the indoor control Indoor Blower Speeds Non Communicating 1 When
108. strated in diagrams which begin on Page 27 Table of Contents Unit Dimensions 2 Parts Arrangement 3 SL280UHV Gas Furnace 4 Shipping and Packing 4 Safety Information 4 Use of Furnace as a Construction Heater 5 General be kdo ke amas 5 Combustion Dilution amp Ventilation Air 6 Setting 9 Filters nerdy ata TITRE 12 Duct System 12 Venting 13 Gas PIPING hy 23 06 11 Electrical 25 Integrated Control Settings 36 Blower Performance Data 39 Unit Start Up siraan au u s ua au wu UQ us A 51 Gas Pressure Adjustment 52 Proper Combustion 52 High Altitude 53 Other Unit Adjustments 54 Heating Sequence of Operation 54 E gor todo 56 Planned Service 59 Repair Parts List 59 Integrated Control Diagnostic Codes 60 Program Unit Capa
109. sure gas orifice and pressure switch may require adjustment or replacement to ensure proper For safety shut unit off and remove manometer as operation at higher altitudes Tables 22 through 25 shows soon as an accurate reading has been obtained manifold pressure pressures switch and gas conversion Take care to replace pressure tap plug kits at all altitudes AIMPORTANT TABLE 22 Manifold Pressure Settings Manifold Manifold Manifold Supply Line Orifice Size Pressure in wg Pressure in wg Pressure in wg Pressure Orifice Size 7501 0 4500 ft 4501 7500 ft 7501 10 000 ft 2 in w g 0 7500 ft 10 000 ft Low Low Low mme mu pes Der pao rer ps pw p Pew 97 149 4s o 4 6 Natural 063 055 1 7 3 5 1 5 3 2 1 7 3 5 4 5 13 0 LP propane 039 10 0 4 9 10 0 4 9 10 0 11 0 13 0 Natural 063 055 1 7 3 5 1 6 2 8 1 7 3 5 4 5 13 0 s 5r 48 o 4s o to no 186 1 This is the only permissible derate for these units 110 2 Natural gas high altitude orifice kit required 3 A natural to L P propane gas changeover kit is necessary to convert this unit Refer to the changeover kit installation instruction for the conversion procedure NOTE Units may be installed at altitudes up to 4500 ft above sea level without modifications TABLE 23 High Altitude Pressure Switch Kits TABLE 24 TABLE 25 Honeywell Gas Valve Conversion Kits White Rodgers Gas Valv
110. t call is completed duct system To clear replace filter if needed or re pair add duct 2 stage controls will reduce firing rate to 18t stage Clears when heat call finishes success fully E311 Heat rate reduced to match indoor blower air flow Warning Only Furnace blower in cutback mode due to restricted airflow Reduce firing rate every 60 seconds to match available CFM Check filter and Page 64 Integrated Control Diagnostic Codes continued Diagnostic Codes Status of Equipment Action Required to Clear and Recover E312 Restricted air flow in cooling or continuous fan mode is lower than cfm Warning Only Restricted airflow Indoor blower is setting running at a reduced CFM Cutback Mode The variable speed motor has pre set speed and torque limiters to protect the motor from damage caused by operating outside of design parameters 0 to 0 8 W C total external static pressure Check filter and duct system To clear replace filter if needed or re pair add duct Cleared after the current service de mand is satisfied tions Alarm is just a warning The system will oper ate but might not meet efficiency and capacity pa rameters Alarm will clear when commissioning is exited Cleared after commissioning is complete E331 Global network connection Communication link problem For Future Use E334 Relay Y1 stuck on interated control Replace integrated control E 347 No 24 Volt output on Y1 of integr
111. ted Control Thermostat Selection DIP Switch 1 ON in Single Stage Position NOTE In these applications two stage heat will be initi ated by the integrated control if heating demand has not been satisfied after the field adjustable period 7 or 12 min utes 1 On a call for heat thermostat first stage contacts close sending a signal to the integrated control The inte grated control runs a self diagnostic program and checks high temperature limit switches for normally closed contacts and pressure switches for normally open contacts The combustion air inducer is ener gized at low speed After the 20 second warm up period has ended the gas valve is energized on low fire first stage and ignition oc curs At the same time the control module sends a sig nal to begin an indoor blower 30 second ON delay When the delay ends the indoor blower motor is ener gized on the low fire heating speed and the HUM con tacts are energized The integrated control also initi ates a second stage on delay factory set at 7 minutes adjustable to 12 minutes If the heating demand continues beyond the second stage on delay the integrated control energizes the combustion air inducer at high speed The control also checks the high fire second stage pressure switch to make sure it is closed The high fire second stage gas valve is energized and the indoor blower motor is energized for operation at the high fire heating speed
112. ting Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1050 1165 18 1000 1110 12 940 1040 6 895 975 Factory Default 820 935 6 775 855 12 805 18 685 750 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm pd Low Medium Low Medium High High Low Medium Low Medium High High 764 802 886 SK 1035 1122 1248 1360 Factory Default 704 725 793 899 949 1029 1135 1257 _ 642 680 717 812 874 999 1021 1133 1 Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control Refer to Installation Instructions for specific DIP Switch Settings Factory default setting NOTES The effect of static pressure is included in air volumes shown First stage HEAT is approximately 91 of the same second stage HEAT First stage COOL two stage air conditioning units only is approximately 7096 of the same second stage COOL speed position Continuous Fan Only speed is selectable at 28 38 70 and 100 of the selected second stage cooling speed minimum 500 cfm Lennox Harmony III Zone Control Applications Minimum blower speed is 425 cfm Page 39 BLOWER DATA SL280UH090V36B BLOWER PERFORMANCE less filter BOTTOM RETURN AIR 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range Heating Speed HEATING
113. ums must be supported separately NOTE When the furnace is installed on a platform in a crawlspace it must be elevated enough to avoid water damage and to allow the evaporator coil to drain Return Air Horizontal Applications Return air must be brought in through the end of a furnace installed in a horizontal application The furnace is equipped with a removable bottom panel to facilitate installation See figure 10 Page 11 Horizontal Application Unit Installed on Platform Line contact is permissible See the unit nameplate for clearances SONS See VES FIGURE 13 A WARNING Improper installation of the furnace can result in per sonal injury or death Combustion and flue products must never be allowed to enter the return air system or the living space Use screws and joint tape to seal the return air system to the furnace In platform installations with bottom return air the furnace should be sealed airtight to the return air ple num A door must never be used as a portion of the return air duct system The base must provide a stable support and an airtight seal to the furnace Al low absolutely no sagging cracks gaps etc The return and supply air duct systems must never be connected to or from other heating devices such as a fireplace or stove etc Fire explosion carbon monoxide poisoning personal injury and or proper ty damage could result AWARNING The inner blower panel must be securely in pl
114. uns at 82 for approximately 7 1 2 minu tes e f demand has not been satisfied after 7 1 2 minutes motor runs at 100 until demand is satisfied e Once demand is met motor runs at 50 for 30 sec onds then ramps down to stop 7 1 2 MIN 82 CFM 100 CFM 1 2 MIN 50 CFM OFF OFF COMPRESSOR DEMAN Ramping Option B Motor runs at 82 for approximately 7 1 2 minutes If demand has not been satisfied after 7 1 2 minutes motor runs at 10096 until demand is satisfied Once demand is met motor ramps down to stop 7 1 2 MIN HE 100 gt OFF 82 CFM OFF COMPRESSOR DEMAND Ramping Option C Motor runs at 100 until demand is satisfied e Once demand is met motor runs at 100 for 45 sec onds then ramps down to stop 100 CFM O OFF 55 DEMAND 45 SEC 100 Ramping Option D e Motor runs at 100 until demand is satisfied e Once demand is met motor ramps down to stop 100 CFM COMPRESSOR OFF lt DEMAND Switches 11 12 and 13 Heating Mode Blower Speed The switches are factory set to the OFF position which pro vides factory default heat speed Refer to table 16 for switches 11 12 and 13 that provided the corresponding in creases or decrease to both high and low heat demand TABLE 16 Heating Mode Blower Speeds Heat Speed Increase 2496 Increase 18 Increase 12 E lt
115. ut If the unit locks out again call the service technician to inspect the unit for blockages 10 Is pressure switch closed Obstructed flue will cause unit to shut off at pressure switch Check flue and outlet for blockages 11 Are flame rollout switches tripped If flame rollout switches are tripped call the service technician for in spection Gas Pressure Adjustment Furnace should operate at least 5 minutes before check ing gas flow Determine time in seconds for two revolu tions of gas through the meter Two revolutions assures a more accurate time Divide by two and compare to time in table 20 below If manifold pressure matches table 22 and rate is incorrect check gas orifices for proper size and restriction Remove temporary gas meter if installed NOTE Shut unit off and remove manometer as soon as an accurate reading has been obtained Take care to replace pressure tap plug TABLE 20 GAS METER CLOCKING CHART Seconds for One Revolution 045 80 160 200 400 90 4 82 102 204 33 66 62 14 155 27 se 68 39 Natural 1000 btu cu ft LP 2500 btu cu ft Supply Line Pressure White Rodgers Gas Valve An inlet post located on the gas valve provides access to the supply pressure See figure 35 Back out the 3 32 hex screw one turn connect a piece of 5 16 tubing and connect to a manometer to measure supply pressure See table 22 for supply line pressure Honeywell Gas Valve A t
116. utlet See figure 22 Venting Using a Masonry Chimney The following additional requirements apply when a lined masonry chimney is used to vent this furnace Masonry chimneys used to vent Category central fur naces must be either tile lined or lined with a listed metal lining system or dedicated gas vent Unlined masonry chimneys are prohibited See figures 23 and 24 for com mon venting A chimney with one or more sides exposed to the outside of the structure is considered to be an exterior chimney An exterior masonry chimney that is not tile lined must be lined with B1 vent or a listed insulated flexible metal vent An exterior tile lined chimney that is sealed and capped may be lined with a listed uninsulated flexible metal vent If the existing chimney will not accommodate a listed metal liner either the chimney must be rebuilt to accommodate one of these liners or an alternate approved venting meth od must be found Insulation for the flexible vent pipe must be an encapsu lated fiberglass sleeve recommended by the flexible vent pipe manufacturer See figure 23 Common Venting Using Metal Lined Masonry Chimney SEALED MAX LENGTH SEE NOTE 1 22 BELOW MIN LENGTH AS SHORT AS PRACTICAL ZA LINER Y VENT CONNECTOR 5 ft 1 5 m minimum EXTERIOR CHIMNEY WITH METAL 4 in 102 mm minimum FURNACE PERMANENTLY SEALED FIREPLACE OPENING
117. vent configurations the vent system is assumed to have two 90 elbows For each additional 90 elbow or equivalent for example two 45 elbows equal one 90 elbow beyond two the maximum capacity listed in the venting table should be reduced by 10 percent 0 90 x maxi mum listed capacity 9 7 Waaa t xs ar 39 7 NR Page 19 TABLE 5 Vent Connector Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category Appliances Vent and Connector Diameter D inches Connector Rie r s R Appliance Input Rating in Thousands of Btu Per Hour 38 81 wj N REN e N N wj o oy BY 44 40 44 47 43 47 50 50 53 55 54 57 62 64 TABLE 6 Common Vent Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category Appliances Common Vent Diameter D inches amn J Sm omn 7mh Appliance Input Rating in Thousands of Btu Per Hour FAN FAN FAN NAT FAN FAN FAN NAT FAN FAN FAN NAT FAN FAN FAN NAT 24 t 39 x s j m s wow j z r j s z x m m 2 m 3 2 r r m z z s _ m 39 29 2 3 3 1 s 2 L z 1 39 L z L sz L J Page
118. wer speed is 485 cfm Page 46 BLOWER DATA SL280UH135V60D BLOWER PERFORMANCE less filter BOTTOM RETURN AIR RETURN AIR FROM BOTH SIDES OR RETURN AIR FROM BOTTOM AND ONE SIDE 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1875 2065 18 1785 1965 12 1695 1865 6 1605 1765 Factory Default 1515 1665 6 1425 1565 12 1330 1465 18 1240 1365 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm po Low Medium Low Medium High 2 High Low Medium Low Medium High High 1025 1120 1325 1650 1500 1600 1840 2235 Factory Default 965 1015 1180 1490 1420 1510 1700 2110 875 930 1060 1350 1225 1320 1505 1840 SINGLE SIDE RETURN AIR 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1850 2035 18 1760 1935 12 1670 1835 6 1580 1740 Factory Default 1490 1640 6 1400 1540 12 1310 1445 18 1225 1345 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm pod Low Medium Low Medium High High Low Medium Low Medium High High 1030 1105
119. ystem Options iring Connections 2 Heat 2 Cool S1 FURNACE OUTDOOR T STAT TERM STRIP UNIT CUT ON BOARD LINK W915 p ES Oo sss 68 6 2 Heat 2 Cool FURNACE OUTDOOR with t stat with CUT ON BOARD LINK TERM STRIP UNIT w915 humidity control OPTION SELECTION 2 Heat 1 Cool FURNACE OUTDOOR with t stat with TERM STRIP UNIT humidity control CUT ON BOARD LINK HARMONY 2 Heat 1 Cool S1 FURNACE OUTDOOR T STAT TERM STRIP UNIT ON BOARD LINKS G PEP oa cg HARMONY 9 6 2 Eee 2 6 Not required on all units Page 30 Thermostat Dual Fuel Single Stage Heat Pump ComfortSense 7000 L7724U thermostat w dual fuel capa bilities Capable of 2 stage gas heat control Dual Fuel Two Stage Heat Pump ComfortSense 7000 L7724U thermostat w dual fuel capa bilities Capable of 2 stage gas heat control TABLE 11 SL280 Field Wiring Applications With Conventional Thermostat Continued DIP Switch Settings and On Board Links figure 34 DIP Switch 1 Thermostat Heating Stages On Board Links Must Be Cut To Select System Options CUT ON BOARD LINK W95 Connect W1 to W1 ONLY if using defrost tempering kit 67M41 NOTE Do NOT make a wire connection between the room thermostat L terminal and the L terminal of the SL280 integrated control Page 31 FURNACE TERM STRI

Lennox International Inc. DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE Furnace User Manual

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