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Lennox International Inc. DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE Furnace User Manual

1. Cut the two wire ties to extend power wires for right side only FIGURE 20 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 12 TABLE 12 Maximum Over Current 070V36A 090V48B 090V60C 110V60C Page 21 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 13 and figure 24 Use 18 gauge wire or larger that is suitable for Class ll ra ting for thermostat connections 1 Electrically ground 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 SL280DFV furnace contains electronic components that are polarity sensitive Make sure th
2. N N gt N gt N N gt N N gt N N _ NOTE Single appliance venting configurations with zero lateral lengths are assumed to have elbows in the vent system For 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 Page 15 TABLE 6 Capacity of Type B Double Wall Vents with Single Wall Metal Connectors Serving a Single Category Appliance Vent and Connector Diameter D inches mew 17278 sma p ma L feet Appliance Input Rating in Thousands of Btu Per Hour HESSEN DE OR UE EM DEOR arsupa mua ee dm cape SS DNI poo ox es rgo Ecos rum cupere igiene pe E E TE pais NT 2T LUE E ze puoi a alios ns poo NEIN 1 07 nose i S sere qu ecu eme pe sqm es E gt espe D nap Dr soto SS SS SS i SSE REC sz esa ip 2 UR 18 2002 9 7 uj 770 m 75 2 24 NR NR NOTE Single appliance venting configurations with zero os lengths are assumed
3. SL280DF110V60C BLOWER PERFORMANCE less filter 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range DIP switch settings on the furnace control Refer to Installation Instructions for specific DIP Switch Heating Speed HEATING DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1645 1810 18 1565 1720 12 1485 1635 6 1405 1545 Factory Default 1325 1460 6 1245 1370 12 1170 1285 18 1090 1195 COOLING Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm pa Low Medium Low Medium High 2 High Low Medium Low Medium High High 1075 1225 1370 1530 1500 255 1915 2120 Factory Default 945 1120 1230 1385 1360 1585 1770 1960 880 985 1135 1235 1225 1405 1595 1760 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 mini
4. ENABLED OUTDOOR UNIT CONDENSATE POWER COMPANY INTERRUPTION SYSTEMS HVAC VERFLOW ARE WIRED SAME AS OVERFLOW SWITCH ee SL280DFV FURNACE icomfort HCWH 2 420vAC AUXILIARY DEHUMIDIFIER OVAH L HAM 49859 LLL HEPA BYPASS FILTER X2680 HEPA INTERLOCK KIT C STANDARD 1 2 gt PASS INDOOR BLOWER STAGE AC OR HP UNIT Q MOTOR COMMON WIRE j CURRENT THROUGH CURRENT LOOP S 29 SEE NEPA INTERLOCK KIT NON COMMUNICATING o FOR INSTALLATION DE S CONDENSATE SYSTEM WIRING OVERFLOW ES TAILS RELAY SWITCH ENABLED SL280DFV FURNACE icomfort OTHER OUTDOOR CONNECTIONS REMAIN THE SAME REFER TO LVCS VENTILATION CONTROL SYSTEM SPECIFIC DIAGRAM e SEE LVCS VENTILATION NSTRUCTIONS FOR DAMPER amp SENSOR WIRING 26L56 CURRENT 2 STAGE FURNACE SENSING RELAY KIT ENABLED THK Q 2 FLOAT COMMUNICATING PER SYSTEM WIRING PASS INDOOR BLOWER MOTOR COMMON WIRE THROUGH 4 CURRENT LOOP SL280DFV FURNACE icomfort FIGURE 22
5. OUTDOOR EQUIPMENT CLIP ON BOARD LINK W915 Y1 TO Y2 FOR TWO STAGE OPERATION NOTE On communicating systems extra wires must terminate on the C RSBus terminal 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 21 Page 23 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 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 HUM CONTACT IS 120VAC CLOSED ANYTIME N HUMIDIFIER HUMIDITY DEMAND IS PRESENT FURNACE ONLY OTHER 120VAC ACC OUTPUT 1 120VAC AIR ENERGIZED ANYTIME NEUTRAL N CLEANER BLOWER IS RUNNING icomfort ENABLED SL280DFV FURNACE 24V HUMIDIFIER CONNECTIONS HCWB2 HCWB3 HCWP3 24VAC 2 HUMIDIFIER NES Discharge Air Sensor Required for even heat DISCHARGE AIR SENSOR CS 7000 48G95 RELAY 177424 THERMOSTAT 120VAC power 20 gt 04 HUMIDIFIER
6. Unit Dimensions inches mm z era ps Air 19 FRONT VIEW Model No in mm SL280DF090V48B 17 1 2 16 3 8 RETURN AIR OPENING B FLUE OUTLET Top 19 7 16 9 16 494 14 9 16 14 TOP VIEW 1 1 2 38 27 3 4 Front 7705 19 7 16 9 16 494 f 14 ELECTRICAL INLET 7 Either Side 5 3 8 137 Right GAS PIPING INLET 2 1 8 54 Left Either Side 6 5 8 168 Right 7 1 8 181 Left 19 1 4 Supply lL 489 Air SIDE VIEW C in mm in mm mm SL250DE070V38A 12 12 13 38 34 SL280DF090V60C SL280DF rtoveoc mne so 4 3 n EID 495 03 Page 2 Parts Arrangement BLOWER ASSEMBLY SECONDARY LIMIT GASKET FLUE CHASE CONTROL BOX Includes two stage integrated control transformer and circuit breaker INTERNAL FLUE PIPE ASSEMBLY DOOR INTERLOCK SWITCH PRIMARY LIMIT LOCATION HEAT EXCHANGER ROLLOUT SWITCH COMBUSTION AIR INDUCER PRESSURE SWITCHES COMBUSTION AIR INDUCER GAS VALVE INNER BLOWER ACCESS PANEL gt m QO lt gt x n4 2 c 2 a ACCESS PANEL FIGURE 1 Page 3 SL280DFV Gas Furnace The SL280DFV gas furnace is equipped with a two stage variable speed integrated control the control is compat ible with Communicating thermostats icomfort Touch Non communicating thermostats ComfortSense or oth er conventional ther
7. VENT CONNECTION DISCONNECTED VENT WARNING STICKER FLUE TRANSITION COLLAR FIGURE 14 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 figure 14 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 15 and 16 for com mon venting Page 12 Common Venting Using Tile Lined Interior Masonry Chimney and Combined Vent Connector 7 MINIMUM LENGTH AS SHORT AS PRACTICAL FOR MAXIMUM LENGTH SEE NOTE TO LEFT NOTE Refer to provided venting tables for installations gt INTERIOR TILE LINED MASONRY CHIMNEY NOTE the chimney must be properly OTHER APPLIANCE FURNACE sized per provided venting tables or lined with listed metal lining system VENT T CONNECTOR PERMANENTLY SEALED FIREPLACE OPENING FIGURE 15 Venting Using a Masonry Chimney The following additional requirements apply when a lined masonry chimney is used to vent this furnace A chimney wi
8. minimum 500 cfm Lennox Harmony III Zone Control Applications Minimum blower speed is 425 cfm SL280DF090V48B BLOWER PERFORMANCE less filter 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range Heating Speed HEATING DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1360 1500 18 1285 1415 12 1220 1350 6 1135 1285 Factory Default 1075 1200 6 1030 1110 12 960 1050 18 890 975 COOLING 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm prd Low Medium Low Medium High High Low Medium Low Medium High High 740 905 1040 1220 1085 1330 1545 1730 Factory Default 690 820 950 1110 990 1200 1400 1 595 610 745 855 1005 895 1075 1270 1460 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 s atic 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
9. 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 331 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 integrated 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 Interlock 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 inte
10. 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 heat 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 311 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 52 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
11. ComfortSense 7000 L7724U thermostat w dual fuel capa bilities Capable of 2 stage gas heat control w dehu midification control Dual Fuel Two Stage Heat Pump ComfortSense 7000 L7724U thermostat w dual fuel capa bilities Capable of 2 stage gas heat control w dehu midification Connect W1 to W1 ONLY if using defrost tempering kit 67M41 TABLE 13 SL280 Field Wiring Applications With Conventional Thermostat Continued DIP Switch Settings and On Board Links figure 25 DIP Switch 1 Thermostat Heating Stages CUT ON BOARD LINK W951 HEAT PUMP HARMONY CUT ON BOARD LINK W915 lt 2 COMPR CUT ON BOARD LIN W951 HEAT PUMP CUT ON BOARD LINK 914 HARMONY On Board Links Must Be Cut To Select System Options L7724U T STAT CUT FUR Wiring Connections FURNACE TERM STRIP FURNACE TERM STRIP HEAT PUMP outdoor sensor HEAT NOTE Do NOT make a wire connection between the room thermostat L terminal and the L terminal of the SL280 integrated control Page 28 2 120V ACC USED 510 PRIMARY GAS 547 FLAME ROLLOUT SWITCH HUMIDIFIER 5 51 ROOM THERMOSTAT QQ 2 12345678 6 9101112131415 TB78 A SENSOR DISCHARGE OUTDOOR AIR 1 1 1 1 1 1 1 1 1 1 1 te OUTDOOR UNIT DIAGNOSTIC H BUTTON SL280DFV Schematic Wiring Diagram COMBUSTION AIR INDUCER MOTOR
12. Page 24 TABLE 13 SL280 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On Board Links See figure 25 x is pda On Board Links Must Be Cut To 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 heat ON delay CUT ON BOARD LINK 0 7 W915 ON 12 minutes 25 COMPR F Oa 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 25 TABLE 13 SL280 Field Wiring Applications With Conventional Thermostat Continued DIP Switch Settings and On Board Links See figure 25 DIP Switch 1 Thermostat Thermostat Heating Stages On Board Links Must Be Cut To Select Wirina C System Options iring Connections 2 Heat 2 Cool S1 FURNACE OUTDOOR T STAT TERM STRIP UNIT CUT ON BOARD LINK W915 p ES Oo sss 6 _ 2 2 Heat 2 Cool FURNACE OUTDOOR with t sta
13. SENSOR Ulli O00000 EVEN NEUTRALS SEGMENT LED 92 INTEGRATED CONTROL ee ir 2 HIGH HEAT PRESSURE SWITCH 5128 LOW HEAT PRESSURE SWITCH 21 SECONDARY BLOWER SPEED CHART FACTORY DEFAULT HUM AT IFC I A CUT W914 JUMPER LABELED DEHUM OR HARMONY FROM DS TO R AT A92 CONTROL BOARD WHEN USED WITH Comfortsense Q 7000 THERMOSTAT A CUT W951 JUMPER FROM O TO R LABELED HEAT PUMP AT A92 CONTROL BOARD WHEN USED FOR DUAL FUEL APPLICATIONS JUMPER W915 FROM 1 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 113 USED ON 1HP ONLY THERMOSTAT HEAT ANTICIPATION SETTING A Program unit capacity s Character on 7 Furnace Circulator Motor Size segment LED Model w dot ON L H OrovacA 12HP L L 0906 1HP DIP SWITCH FACTORY DEFAULT IS FOR A TWO STAGE THERMOSTAT FIELD SUPPLIED ACC WIRE USE COPPER CONDUCTORS ONLY 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 TWO STAGE P WHITE RODGERS VALVE WHITE RODGERS VALVE HEAT COOL NOTE SEE INSTALLATION INSTRUCTIONS FOR PROCEDURE TO SET CORRECT BLOWER SPEED FOR SPEC
14. 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 51 Integrated Control Diagnostic Codes continued E272 Softlockout Exceeded maximum number of recycles Last recycle due Check operation of low pressure 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
15. 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 de mand After supply and return air temperatures have stabi lized 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 blow er speed to increase the temperature rise Failure to properly adjust the temperature rise may cause erratic limit operation and may result in premature heat exchanger failure 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 Heating Sequence of Operation Electronic Ignition The two stage variable speed integrated control used in SL280DFV 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 This type of lockout is usually due to low gas line pressure After 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 b
16. run a vacuum cleaner with a soft brush attachment over the face of burners Visually inspect in side the burners and crossovers for any blockage caused by foreign matter Remove any blockage Figure 30 shows burner detail Page 44 SL280DFV BURNER COMBUSTION AIR INDUCER ASSEMBLY amp j HEAT EXCHANGER REMOVAL flue chase internal flue pipe combustion air inducer collector box pressure switch heat exchanger burners manifold and gas valve retention rings Cross over FIGURE 30 Page 45 12 To clean the combustion air inducer visually inspect and using a wire brush clean where necessary Use com pressed air to clean off debris and any rust 13 Reinstall heat exchanger in vestibule Replace the five screws in the cabinet from step 10 if removed 14 Reinstall collector box combustion air assembly inter nal flue pipe and flue chase Seal with high tempera ture RTV Reinstall all screws to the collector box and combustion air inducer Failure to replace all screws may cause leaks Inspect gaskets for any damage and replace if necessary 15 Reinstall burner box manifold assembly and burner box cover 16 Reconnect all wires 17 Reconnect top cap and vent pipe to combustion air in ducer outlet 18 Reconnect gas supply piping 19 Turn on power and gas supply to unit 20 Set thermostat and check for proper operation 20 Check all piping connections factory and field for gas leaks Use a leak
17. 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 53 Integrated Control Diagnostic Codes continued LSOM Compressor open start circuit LSOM Compressor open run circuit LSOM Compressor contactor is welded LSOM Compressor low voltage Page 54 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 opera
18. 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 MANUAL Left Side Piping AUTOMATIC MAIN SHUT OFF Standard GAS VALVE 2 VALVE MANUAL AUTOMATIC with manual MAIN SHUT OFF GAS VALVE shutoff valve VALVE with manual shut off valve Ex n i G GROUND JOINT UNION GROUND JOINT UNION DRIP LEG Right Side Piping PROVIDED Alternate DRIP LEG AND INSTALLED FIELD NOTE BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET FIGURE 17 Page 20 Leak Check After gas piping is completed carefully check all piping connections factory and field installed for gas leaks Use 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 ACAUTION Some soaps used leak detection 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 The furnace must be isolated from the gas supply system by closing its individual manual shut off valve during any pressure testing of the
19. 23 Table of Contents Unit Dimensions 2 Parts Arrangement 3 SL280DFV Gas Furnace 4 Shipping and Packing List 4 Safety Information 4 Use of Furnace as a Construction Heater 5 General 5 Combustion Dilution amp Ventilation Air 6 Setting 10 z anan asap tia 11 Duct System 12 Mog um 12 Gas PIPING ee ca bdo ean RR rA RE 19 06 11 LARA Electrical 31 LE 21 Integrated Control Settings 32 Blower Performance Data 35 Unit Start Up s uses 39 Gas Pressure Adjustment 40 Proper Combustion 40 High Altitude esse eim rre he Pens 41 Other Unit Adjustments 42 Heating Sequence of Operation 42 SENICE suum Ny deir 44 Planned Service 47 Repair Parts List 47 Integrated Control Diagnostic Codes 48 Program Unit Capacity Size Mode 55 Troubleshooting 56 506710 01 VAN AIAN AU O
20. Code NOTE Furnace must be aqjusted 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 also result in premature heat exchanger failure This SL280DFV furnace must be installed so that its electri cal 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 With a parallel flow arrangement a damper or other means to control the flow of air must adequately prevent 4 chilled air from entering the furnace see figure 1 If the damper is manually operated it must be equipped to pre vent operation of either the heating or the cooling unit un less it is in the full HEAT or COOL setting GAS UNIT AIR HANDLER Dampers open during cooling operation only Dampers open during heating operation only 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
21. Demand High 7096 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 With Condensing unit Cut W914 R to DS on board a cooler room thermostat With Heat Pump Cut W914 R to DS amp W951 R to O on SureLight control setpoint ComfortSense9 7000 thermostat to use for this application Y2081 4 heat 2 cool Normal operation first stage cooling blower speed is 7096 COOL speed Dehumidification blower speed is reduced to 7096 of COOL In Precision mode ComfortSense9 7000 thermostat will maintain room temperature up to 2 F 1 2 C cooler than room setting Page 38 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 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 pacema
22. Do force See figure 26 or 27 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 26 HONEYWELL GAS VALVE HIGH FIRE ADJUSTING SCREW under cap INLET PRESSURE TAP ON SIDE US x MANIFOLD PRESSURE TAP ON GAS VALVE SHOWN IN ON POSITION SIDE FIGURE 27 8 Move switch on gas valve to ON Do not force See fig ure 26 or 27 9 Replace the 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 39 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 switch on gas valve to OF Do not force See fig ure 26 or 27 5 Replace the upper access panel Failure To Operate
23. If the unit fails to operate check the following 1 15 the thermostat calling for heat 2 Are access panels securely in place 3 Is the main disconnect switch closed 4 s there a 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 out 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 Is the rollout switch tripped If the switch is tripped call the service technician to inspect the unit Gas Pressure Adjustment Gas Flow Approximate 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 22 below If manifold pressure matches table 24 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 22 GAS METER CLO
24. Outlet Air to Ventilated Attic ET AIR WATER HEATER NOTE The inlet and outlet air openings shall each have 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 VENT VENTILATION LOUVERS Each end of attic INLET AIR Ends 12 in ll bottom WATER HEATER LT 11 inlet and outlet air openings shall each have free area of at least one square inch 645 mm2 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 Page 8 EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE WATER HEATER OUTLETAIR INLETAIR NOTE Each air duct opening shall have 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 Downflow Installation Downflow unit installs in three
25. classified as fan assisted Category furnaces when vertically vented according to the latest edition of National Fuel Gas Code 54 ANSI 7223 1 A fan assisted Category furnace is an ap pliance equipped with an integral mechanical means to ei ther draw or force combustion products through the com bustion chamber and or heat exchanger 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 in this manual were extracted from the National Fuel Gas Code 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 The warning sticker is provided in the bag assembly Order 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
26. 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 14 pro vides the blower off timings that will result from different Switch settings TABLE 14 Blower Off Delay Switch Settings Seconds _ 6 O O gt 90 Factory 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 15 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 7096 of the second stage cfm for first stage cfm Refer to tables for corresponding cfm values TABLE 15 Cooling Mode Blower Speeds Speed low O n MedumLow Oof 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 16 below provides blower spe
27. detecting solution or other preferred means CAUTION Some soaps used leak detection 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 21 If aleak is detected shut gas and electricity off and repair leak 22 Repeat steps 21 and 23 until no leaks are detected 23 Replace access panel Remove five screws if necessary either side of cabinet FIGURE 31 Page 46 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 door 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 perfor
28. 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 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 che
29. in the common venting tables must be reduced by 10 the equivalent of one 90 elbow 0 90 x maximum common vent capacity Page 14 18 19 The common vent diameter must always be least as large as the largest vent connector diameter In no case shall the vent connector be sized more than 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 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 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 TABLE 5 Capacity of Type B Double Wall Vents with Type B Double Wall Connectors Serving a Single Category Appliance VentandCommedorDiameter D mches um T eh fes Appliance Input Rating in Thousands of Btu Per Hour ww wax ww wx ww s rj wem 3 plum ci EN TESUER CTI p e qnl P S p o ou MEINE 288 BOND Co N oO o oJ e N of 2
30. low fire man ifold pressure low fire manifold pressure is more than 1 2 above or below value specified in table 24 replace valve Proper Combustion Furnace should operate minimum 15 minutes with correct manifold pressure and gas flow rate before checking com bustion Table 23 shows acceptable combustion for ALL SL280DFV models TABLE 23 High Fire 6 0 7 4 6 9 8 4 48 60 57 70 The carbon monoxide reading should not exceed 50 ppm Page 40 High Altitude The manifold pressure 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 24 through 27 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 24 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 Su mur per poer pao per p pw AE Su mu pes pereo ps pw ia Natural 063 055 1 7 3 5 1 5 3 2 1 7 3 5 4 5 13 0 5r 48 o 4s to no 186 1 This is the only permissible derate for these units 2 Natural gas high altitude orifice kit
31. 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 Page 5 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 ifornia 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 firep
32. 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 SPACE ALL AIR FROM INSIDE CHIMNEY OR GAS VENT OPENINGS To Adjacent Room 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 have 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
33. 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 25 High Altitude Pressure Switch Kits TABLE 26 TABLE 27 Honeywell Gas Valve Conversion Kits White Rodgers Gas Valve Conversion Kits LP Propane Natural Gas to to LP Propane Kit Natural Gas Unit Orifice Kit LP Propane Kit Natural Gas Kit Input Kit 7501 7501 7501 7501 10 000 ft 0 7500 40 000 ft 0 7500 ft 10 000 ft 0 7500 ft 40 000 ft 0 7500 ft 73W37 51W02 73W38 69W79 77W05 77107 77W11 77W09 LP Propane High Altitude Natural Gas to to Natural Gas Orifice Kit High Altitude Natural Gas 73W37 51W02 73W38 69W79 090 77W05 77W07 77W11 77W09 110 73W37 51W02 73W38 69W79 77W05 77W07 77W11 77W09 Page 41 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 limits are factory set and require no adjustment Flame Rollout Switch This manually reset switch is located on the burner box If tripped check for adequate combustion air before reset ting Pressure Switches The pressure switch assembly includes two switches is
34. 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 appliances 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 Unconfi
35. 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 per 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 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 ZS VENTILATION LOUVERS Each end of attic FURNACE VENTILATION LOUVERS For unheated crawl space us OUTL EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE Inlet Air from Crawlspace and
36. 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 listed capacity 188 116 115 144 182 220 114 113 141 A e 1 2 6 6 2 A A 2 2 2 2 O w gt lt j 2 w o ol c D Al A 2 D 2 N D gt 2 z Z o D 2 A D D 2 D D 2 2 A 2 2 30 2 2 2 ESE 54 L 3 2 Page 16 TABLE 7 Vent Connector Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category 1 Appliances Vent and Connector Diameter D inches Connector rw R Appliance Input Rating in Thousands of Btu Per Hour 38 3 S m 3 _ N O N O o 44 40 44 47 43 47 50 50 53 55 54 57 62 64 TABLE 8 Common Vent Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category 1 Appliances Common Vent Diameter D inches C _ S rz omqx p ce
37. ttThe furnace may be installed on a combustible wood floor if an optional additive base is installed between the furnace and the combustible floor 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 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 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 proper ty damage could result 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 3 lists recommended filter sizes A filter must be in place any time the unit is operating TABLE 3 Cabinet Width Return Air Filter Size inches A 14 1 2 14 25 1 1 17 1 2 16 x 25 x 1 1 20 x 25 x1 1 Page 11 Duct System Use industry approved standards such as those pub lished by Air Conditioning Contrac
38. 01112131415 DIAGNOSTIC 1000000 suron INTERLOCK 1 TB82 RS BUS LINK ME 0606000909096 l TERMINAL BOARD TB1 FIELD INSTALLED CLASS II 24V FIELD INSTALLED LINE VOLTAGE FIGURE 24 Page 30 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 DATA HIGH CONNECTION DATA LOW CONNECTION RS BUS OUTDOOR TB83 24VAC DATA HIGH CONNECTION DATA LOW CONNECTION 24VAXC COMMON RS BUS INDOOR TB84 24VAC DATA HIGH CONNECTION DATA LOW CONNECTION 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 CONNECTOR 12 PIN LOW VOLTAGE CONNECTOR W915 Y1 TO Y2 2 STAGE COMPR W951R TOO 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 CLASS 2 VOLTAGE TO THERMOSTAT MANUAL FAN FROM T STAT C THERMOSTAT SIGNAL GROUND CONNECTED TO
39. 7 Hz to than 5 THD total harmonic distortion icomfort Touch Thermostat with SL280DFV icomfort Touch Thermostat with SL280DFV and Non Communicating Outdoor Unit and icomfort ENABLED Outdoor Unit icomfort Touch Thermostat icomfort Touch Thermostat icomfort Enabled SL280DFV Indoor Furnace icomfort Enabled SL280DFV Indoor Furnace Non Communicating Outdoor Air Conditioner icomfort Enabled Outdoor Air Conditioner Heat Pump icomfort ENABLED icomfort SL280DFV ENABLED FURNACE SL280DFV FURNACE OPTIONAL DISCHARGE AIR SENSOR OC OPTIONAL DISCHARGE AIR SENSOR OPTIONAL EEG OUTDOOR OPTIONAL E AIR SENSOR OUTDOOR AIR SENSOR ees _ icomfort Touch THERMOSTAT GREEN a war YELLOW RED R Le 5 DISCHARGE AIR SENSOR icomfort Touch amp THERMOSTAT GREEN i YELLOW 1 R RED 1 OUTDOOR AIR SENSOR OUTDOOR DISCHARGE AIR SENSOR AIR SENSOR C INDOOR EQUIPMENT ooooQo 2e2ve oo00 X icomfort ENABLED OUTDOOR AIR CONDITIONING OR HEAT PUMP UNIT INDOOR EQUIPMENT GREEN war RED NON COMMUNICATING OUTDOOR AIR CONDITIONING UNIT 2 STAGE m A OUTDOOR EQUIPMENT eeoo booo eo oo YL 2 STG ONLY BL LSOM ONLY
40. CKING CHART Seconds for One Revolution 05 80 160 200 400 90 82 02 24 790 33 66 82 64 s 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 27 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 24 for supply line pressure Honeywell Gas Valve A threaded 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 24 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 26 or tap figure 27 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 24 4 necessary make adjustments Figures 26 and 27 show location of high fire adjustment screw 5 If an adjustment is made high fire re check man ifold pressure on low fire Do not adjust
41. CONVENTIONAL 120VAC IK CSS RELAY NON COMMUNI or 240VAC STEAM Y CATING SYSTEM HUMIDIFIER COMMUNICATING SYSTEM icomfort Touch THERMOSTAT 2 GREEN WHITE YELLOW RED RSBus OUTDOOR AIR SENSOR Maximum total length of all con nections on the RSBus is limited to 1500ft Wire gauge of RSBus wire is 18 PURPLE 24V IN JUMPER 2222 000000600000 INDODR EQUIPMENT C CR 111 icomfort ENABLED HUMIDITROL EDA ON SL280DFV FURNACE In an icomfort by Lennox system neither furnace nor air handler trans former will have adequate VA to 2t power 24V UV light applications An additional transformer for UV light icomfort Touch applications is required THERMOSTAT NC 10 N C 00 D 1000 N O gt T11 HUM COM 4 T12 N O Me COM c i 77 24V IN jumper not used in non HRV3 OR ERV3 communicating configuration Y OUTDOOR EQUIPMENT INDOOR EQUIPMENT BLACK e icomfort ENABLED OUTDOOR AIR CONDITIONING OR HEAT PUMP UNIT Ot HY O li OF HO i ET y TER DEHUMIDIFIER CONTROL
42. E ing nace The piping must be supported at proper intervals ers piis d no OR aed every 8 to 10 feet 2 44 to 3 01 m with suitable hang MODINE On ANY o dese alles Suet ers or straps Install a drip leg inside vertical pipe runs range hoods and bathroom exhausts so they will oper to the unit ate at maximum speed Do not operate a summer ex 5 haust fan Close fireplace dampers 5 1 8 plugged tap or pressure post is located the gas valve to facilitate test gauge connection 4 Follow the lighting instructions Turn on the appliance See fi 26 and 27 that is being inspected Adjust the thermostat so that the appliance operates continuously 6 In some localities codes may require the installation of 5 After the main burner has operated for 5 minutes test a manual main shut off valve and union furnished by for leaks of flue gases at the draft hood relief opening the installer external to the unit The union must be of Use the flame of a match or candle or smoke from a the ground joint type cigarette cigar or pipe 6 After determining that each appliance connected to the A PORTANT 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 Compounds used threaded joints of gas piping must be resistant to the
43. ECTABLE OFF DELAY Page 58 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 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 59 Troubleshooting Continuous Fan Sequence of Operation CALL FOR FAN CALL FOR FAN INDOOR BLOWER ON CONTINUOUS FAN MAINTAIN INDOOR BLOWER AT CONTINUOUS FAN REQUEST FOR COOLING 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 60
44. IFIC COOLING TONNAGE BEING APPLIED AND HEATING TEMPERATURE RISE REQUIRED TYPICAL SYSTEM SHOWN FOR 2 HEAT 2 COOL WITH A CONVENTIONAL THERMOSTAT SEE INSTALLATION INSTRUCTIONS FOR CONNECTIONS TO OTHER EQUIPMENT AND ACCESSORIES OO BOCES C R TBI I C TERMINAL BOARD INTERLOCK INTEGRATED CONTROL A92 INTEGRATED CONTROL OUTDOOR EQUIPMENT PRESSURE SWITCH 5128 LOW HEAT PRESSURE SWITCH HIGH HEAT OUTDOOR DISCHARGE SENSOR AIR SENSOR COMBUSTION AIR BLOWER MOTOR POWER INDOOR BLOWER MOTOR A92 INTEGRATED CONTROL WARNING ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES NOTE IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT MUST BE REPLACED WITH WIRE OF LIKE SIZE RATING INSULATION THICKNESS AND TERMINATION EQUIPMENT GROUND LINE VOLTAGE FIELD INSTALLED CLASS II VOLTAGE FIELD WIRING DENOTES OPTIONAL COMPONENTS FIGURE 23 Page 29 TYPICAL SL280DFV FIELD WIRING DIAGRAM 120V ACC 10 IF USED PRIMARY COMBUSTION AIR c O GAS Jod INDUCER MOTOR GAS LIMIT m O VALVE M BURNERS 102 HIGH HEAT PRESSURE SWITCH FLAME ROLLOUT FLAME SWITCH SENSOR PRESSURE SWITCH e 1 21 T ROOM THERMOSTAT SEVEN A92 NEUTRALS 0 TRANSFORMER SECONDARY SEGMENT INTEGRATED rM 12345678 LED CONTROL 00000000 91
45. LENNOX 2011 Lennox Industries Inc Dallas Texas USA DOWNFLOW AIR FLOW A CAUTION As with any mechanical equipment personal injury can result from contact with sharp sheet metal edges Be careful when you handle this equipment This is 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 INSTALLATION INSTRUCTIONS SL280DFV DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE DOWNFLOW AIR DISCHARGE Technical Publications Litho U S A 506710 01 06 2011 Supersedes 01 2011 THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE AWARNING Improper installation adjustment alteration service 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 NOTICE A thermostat is not included and must be ordered separately e The Lennox icomfort Touch thermostat must be used 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 illustrated in diagrams which begin on Page
46. 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 the thermostat is set to FAN 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 SL280DFV is running in the heating m
47. STIBLE FLOORING BASE PROPERLY SIZED FLOOR OPENING FIGURE 7 TABLE 2 COMBUSTIBLE FLOOR OPENING SIZE Front to Rear Side to Side inui Mcd NOTE Floor opening dimensions listed are 1 4 inch 6 mm larger than unit opening See unit dimensions on page 2 2 After opening is cut set combustible flooring base into opening 3 Check sealing strips on combustible flooring base to make sure they are properly glued and positioned 4 Lower supply air plenum into downflow combustible flooring base until plenum flanges seal against the strips NOTE Be careful not to damage sealing strips Check for a tight seal 5 Set the furnace over the plenum 6 Ensure that the seal between the furnace and plenum is adequate Installation on Cooling Cabinet Figure 8 1 Refer to reverse flow coil installation instructions for correctly sized opening in floor and installation of cabi net NOTE Downflow combustible flooring kit is not used 2 When cooling cabinet is in place set and secure the furnace according to the instructions that are provided with the cooling coil Secure the furnace to the cabinet 3 Seal the cabinet and check for air leaks Page 9 SL280DFV UNIT PROPERLY i N COOLING COIL SIZED FLOOR PLENUM OPENING A oo ga a Ease p es ee FIGURE 8 Return Air Opening Downflow Units The following steps should be taken when installing ple num 1 Bottom edge of p
48. TRANSFORMER GRD TR amp CHASIS GROUND GRD Y1 THERMOSTAT 1ST STAGE COOL SIGNAL Y2 THERMOSTAT 2ND STAGE COOL SIGNAL 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 25 Page 31 Integrated Control DIP Switch Settings Conventional Thermostat non communi cating SL280DFV 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 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 thermost
49. TS 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 56 Troubleshooting Heating Sequence of Operation 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 1 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 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 57 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 SEL
50. actions of liquified petro leum gases Page 19 TABLE 11 Gas Pipe Capacity 3 m3 hr Nominal Length of Pipe feet m Iron Pipe Internal g p m Diameter 1 2 622 127 17 799 aie inches 10 20 30 40 60 70 80 90 100 mm mm 3 048 6 096 9 144 12 192 18 288 21 336 24 384 27 432 30 480 66 61 57 53 50 1 87 1 73 1 61 150 142 175 120 97 82 73 4 96 3 40 2 75 2 32 2 07 1 61 3 4 824 360 250 200 170 151 138 125 118 110 103 19 05 20 930 10 19 7 08 5 66 4 81 4 28 3 91 3 54 3 34 3 11 2 92 1 1 049 680 465 375 320 285 260 240 220 205 195 25 4 26 645 919 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 2 1 610 2100 460 1180 990 900 810 750 690 650 620 38 1 40 894 59 46 41 34 33 41 28 03 25 48 22 94 21 24 19 54 18 41 17 56 2 2 067 3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 50 8 52 502 111 85 77 87 62 30 53 80 47 57 43 04 39 64 36 81 34 55 32 56 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 3 3 068
51. air inducer for correct opera tion and restriction Resumes normal operation after E224 Low pressure switch failed closed Refer to troubleshooting See Check operation of low pressure switch to see if it is Page 56 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 pressure Page 56 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 56 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 56 closing on heat call Measure operating pressure inches w c Inspect vent and combustion air in ducer for correct operation and restriction Re E227 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 norm
52. al 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 sensed out of sequence Flame still present Shut off gas Check for gas valve leak Replace if necessary Alert clears when fault is recovered E250 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 56 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 252 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
53. al 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 licensed profes sional technician or equivalent should check the system as follows Blower Check the blower wheel for debris and clean if necessary The 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 SL280DFV 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 3 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 access panel in place Unit Nameplate Actual Cleaning the Heat Exchanger and Bu
54. at 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 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
55. at the furnace is wired correctly and is properly grounded One line voltage 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 25 for control configuration This terminal is energized when the indoor blower is operat ing An unpowered normally open dry set of contacts with 1 4 spade terminal 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 Install the room thermostat according to the instruc tions provided with the thermostat See table 13 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 Thermostat Selection ACAUTION Field wiring for both communicating and non com municating applications is illustrated diagrams which begin on Page 23 1 cO Non Communicating In non communicating applications the SL280DFV is de signed to operate in a SINGLE STAGE mode or TWO
56. ated 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 least one drafthood equipped appliance The vent connectors and chimney are sized according to the provided venting tables Iftype 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 SL280DFV 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 Page 13 Never connect a Category appliance to a chimney that is servicing a solid fuel appliance If a fireplace
57. cfm Lennox Harmony III Zone Control Applications Minimum blower speed is 455 cfm Page 35 BLOWER DATA SL280DF090V60C BLOWER PERFORMANCE less filter 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range Heating Speed HEATING DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1540 1695 18 1465 1615 12 1390 1530 6 1320 1450 Factory Default 1245 1365 6 1170 1285 12 1095 1205 18 1020 1120 COOLING 1 Cooling Speed First Stage Cooling Speed cfm Second Stage Cooling Speed cfm asinos Low Medium Low Medium High High Low Medium Low Medium High High 1125 1250 1400 1590 1585 1770 2000 2275 Factory Default 1020 1135 1285 1445 1420 1610 1845 2 050 900 1005 1155 1280 1305 1395 1645 1875 Cooling and heating speeds are based on a combination o 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 Zone Control Applications Minimum blower speed is 480
58. 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 SL280DFV furnaces according to these instruc tions 1 Vent diameter recommendations and maximum allow able piping runs are found in the provided venting tables 2 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 ar
59. ck 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 Hardware problem on the control Cycle power on control Replace if problem prevents service and is persistent Cleared 300 seconds after fault recov ered Page 49 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 n
60. 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 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 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 20 for operation sequence in ap plications including SL280DFV a thermostat which fea tures humidity control and a single speed outdoor unit Table 21 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 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 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
61. e Codes for configuration flow chart See Page 55 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 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 15 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 56 Measure resistance of hot surface ignitor Replace if open or not within specified range found IOM Resumes normal operation after fault is cleared Page 50 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
62. e 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 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 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 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 When the combustion air p
63. ea or flue collar area unless de signed according to approved engineering methods 1 The entire length of single wall metal vent connector shall be readily accessible for inspection cleaning and replacement N Single appliance venting configurations with zero lat eral lengths tables 5 and 6 are assumed to have 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 10 0 90 x maximum listed ca pacity 8 The common venting tables 7 8 9 and 10 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 4 inches mm Connector Length feet m 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 connec
64. each furnace model for three seconds FINISHED Page 55 Troubleshooting Heating Sequence of Operation CALL FOR FIRST STAGE HEAT CALL FOR 1ST STAGE HEAT LOW FIRE INDOOR BLOWER OFF AFTER HEAT FAN OFF DELAY LOW HEAT SPEED INDOOR BLOWER OFF ERROR INDOOR AFTER HEAT FAN _ WATCHGUARD CODE BLOWER OFF DELAY LOW ERROR CODE FLASHES ON LOW HEAT HEAT SPEED FLASHES SPEED ROLLOUT a ERROR CALL DE ENERGIZE CODE FOR HEAT CIRCUITS 2 GAS VALVE INDOOR BLOWER FLAsHES ENDS ON LOW HEAT 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 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 1 ON TIMER STARTED POSTPURGE INDUCER WATCHGUARD 8 SECONDS ERROR CODE FLASHES YES 1 OFF WATCHGUARD LOCKOUT AUTOMATICALLY RESETS AFTER ONE HOUR INDOOR BLOWER ON 45 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 GE
65. ed Pause cfm setting displayed Pause Repeat codes Blinking during ignition Defrost mode Discharge Air Temperature Page 48 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 message 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 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
66. ed adjustments that will result from different switch settings Refer to tables for corresponding cfm val ues TABLE 16 Cooling Blower Speed Adjustment Adjustment Switch7 Switchs 10 aprox Of 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 17 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 Page 32 NOTE The off portion of the selected ramp profile also plies during heat pump operation in dual fuel applications TABLE 17 Cooling Mode Blower Speed Ramping Ramping Option Switch9 Switch 10 A Factory Ramping Option A Factory Selection e Motor runs at 5096 for 30 seconds e Motor then runs 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 82 100 gt 1 2 50 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 minut
67. egin the ignition sequence NOTE The integrated control thermostat selection DIP switch is factory set in the TWO STAGE position Applications Using a Two Stage Thermostat See figure 28 for ignition control sequence A Heating Sequence Integrated Control Thermostat Selection DIP Switch 1 OFF in Two Stage Position Factory Setting 1 call for heat thermostat first stage contacts close Page 42 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 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 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 modul
68. es motor runs at 100 until demand is satisfied e Once demand is met motor ramps down to stop 7 1 2 MIN E 100 OFF 82 OFF COMPRESSOR DEMAND Ramping Option C Motor runs at 100 until demand is satisfied Once demand is met motor runs at 100 for 45 sec onds then ramps down to stop 100 pele 100 OFF COMPRESSOR DEMAND 45 SEC Ramping Option D e Motor runs at 100 until demand is satisfied e Once demand is met motor ramps down to stop 100 QEF COMPRESSOR OFF DEMAND Switches 11 12 and 13 Heating Mode Blower Speed The switches are factory set to the OFF position which pro vides normal heat speed Refer to table 18 for switches 11 12 and 13 that provided the corresponding increases or de crease to both high and low heat demand TABLE 18 Heating Mode Blower Speeds Heat Speed Cresa On On n C reesen On Of _ On Of Os Trerease ae Ox of Of _ o 9 Switch 13 Switches 14 and 15 Continuous Blower Speed Table 19 provides continuous blower speed adjustments that will result from different switch settings TABLE 19 Continuous Blower Speed Continuous Blower Speed 8 of High Cool Speed Factory 7096 of High Cool Speed 10096 of High Cool Speed Page 33 On Board Links Note In icomfort systems with a conventional outdoor unit non
69. for a minimum continu ous return air temperature of 60 F 16 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 29 dry bulb The SL280DFV furnace may be installed in alcoves clos ets attics basements garages and utility rooms in the downflow position This furnace design has not been International certi fied for installation in mobile homes recreational vehicles or outdoors Use of Furnace as Construction Heater Lennox does not recommend the use of SL280DFV 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 misplaced filters will dam age the unit SL280DFV units may be used for heating of buildings or 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 Air filters must be installed the system and must be maintained during construction e Air filters must be replaced upon construction comple tion e The
70. g Two or More Category Appliances Common Vent Diameter D inches Appliance Input Rating in Thousands of Btu Per Hour FAN FAN FAN NAT FAN FAN FAN NAT FAN FAN FAN FAN 18 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 following 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 POISONING HAZARD Failure to follow the steps outlined below for each connected to the venting system being placed into operation could result in carbon mon 7 f 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 7223 1 A CAUTION flexible gas is required allowed the authority that has juri
71. g push button until 3 horizontal lines are displayed e 10 minutes of entering the flame sense mode Page 34 BLOWER DATA SL280DF070V36A BLOWER PERFORMANCE less filter 0 through 0 8 in w g Heating and 0 through 1 0 in w g Cooling External Static Pressure Range Heating Speed HEATING DIP Switch First Stage Heating Speed cfm Second Stage Heating Speed cfm Settings 24 1065 1170 18 1010 1115 12 960 1055 6 910 1000 Factory Default 860 945 6 805 885 12 755 830 18 705 775 COOLING 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 745 870 1025 1075 1100 1240 1425 1515 Factory Default 665 780 925 985 1015 1115 1305 1380 _ 590 690 815 865 900 1025 1170 1250 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 s atic 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
72. gas supply system at pressuresless than or equal to 1 2 psig 3 48 kPa 14 inches w c AIMPORTANT When testing pressure of gas lines gas valve must be disconnected and isolated See figure 18 Gas valves can be damaged if subjected to pressures greater than 1 2 psig 3 48 kPa 14 inches w c MANUAL MAIN SHUT OFF VALVE WILL NOT HOLD NORMAL TEST PRESSURE ISOLATE GAS VALVE FURNACE 1 8 NPT PLUG CAP FIGURE 18 ELECTROSTATIC DISCHARGE ESD Precautions and Procedures 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 hand side clip the wire ties that bundle the wires together Secure the excess wire to the existing harness to protect it from damage Refer to figure 24 for unit field wiring See figures 21 and 22 for icomfort Touch thermostat wiring in communicating applications Table 13 shows DIP switch and on board link settings for non communicating thermostat applications Typical wiring schematic is shown in figure 23 INTERIOR MAKE UP BOX INSTALLATION Left Side FIGURE 19 INTERIOR MAKE UP BOX INSTALLATION Right Side
73. grated 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 Y1 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
74. h Ignitor Primary limit control Flame rollout switch Secondary limit Page 47 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 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 i
75. input rate and temperature rise must be set per the furnace rating plate e One hundred percent 100 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 These 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 SL280DFV furnace 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
76. ith three flexible legs and one rigid leg See figure 11 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 washer 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 SL280DFV07036A WITH 1 2 HP BLOWER MOTOR RIGID LEG remove shipping bolt and washer FIGURE 11 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 into living space resulting in personal inju ry or death Page 10 FIGURE 12 Downflow Application Allow for clearances to combustible materials as indi cated on the unit nameplate Minimum clearances for closet or alcove installations are shown in figure 13 Downflow Application Installation Clearances Left Side Right Side Bottom Type of Vent Ts Front 2 1 4 in 57 2 1 4in 57 mm EE AD E NEED 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 TLeft side requires 3 in if a single wall vent is used on 14 1 2 in cab inets or 2 in if a single wall vent is used on 17 1 2 in cabinets
77. ker 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 SL280DFV unit will be equipped with either a gas control switch Use only your hand to move the control switch Never use tools If the switch will not turn or if the switch will not move by hand do not try to repair it Force or attempted repair may result in a fire or explosion Placing the furnace into operation SL280DFV 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 26 and 27 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 access panel 6 Move switch on gas valve to OFF
78. laces 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 SL280DFV furnaces to ensure effi cient and safe operation You must consider combustion air needs and requirements for exhaust vents A portion of this information has been reprinted with permission from the National Fuel Gas Code ANSI Z223 1 This reprinted ma terial is not the complete and official position of the ANSI on the referenced subject which is represented 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 the heat exchanger resulting 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
79. lenum should be flanged with a hemmed edge See figure 9 PLENUM SECURE FROM OUTSIDE CABINET p e EDGE CABINET SIDE PANEL FIGURE 9 2 Sealing strip should be used 3 In all cases plenum should be secured to top flanges of furnace with sheet metal screws Side View SEALING STRIP Field Provided PLENUM SECURE FROM IN SIDE CABINET Side View HEMMED EDGE FIBERGLASS SEALING STRIP Field Provided PANEL CABINET SIDE FIGURE 10 4 In closet installations it may be impossible to install sheet metal screws from the outside In this case make plenum with a removable front and install screws from the inside See figure 10 5 Make certain that an adequate seal is made AWARNING Do not install the furnace on its front back or in the horizontal position See figure 12 Do not connect the return air ducts to the back of the furnace Doing so will adversely affect the operation of the safety con trol devices which could result in personal injury or death Install the SL280DFV gas furnace as shipped in the downflow position only Do not install the furnace hori zontally Select a location 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 w
80. mance 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 that 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 SL280DFO70V36A 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 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 switc
81. mh Appliance Input Rating in Thousands of Btu Per Hour FAN FAN FAN FAN FAN FAN FAN st 2 cp Gee CI 0e r 309 m m J z r s x q r s j m m 26 m 79 3 5 39 _ z 2 z 1 s 2 P s L z P sz __ __ J Page 17 TABLE 9 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 Appliance Input Rating in Thousands of Btu Per Hour MAX 2 t 2 58 2 EC C cess 52 252 7 5 9 r m P m L L s 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 listed capacity TABLE 10 Common Vent Capacity Type B Double Wall Vents with Single Wall Metal Connectors Servin
82. mostats Control systems Harmony III Zone Control System non communicating Each SL280DFV unit is shipped ready for installation in the downflow position Shipping and Packing List Package 1 of 1 contains 1 Assembled SL280DFV 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 Propane LP changeover kit 1 Combustible flooring base Check equipment for shipping damage If you find any damage immediately contact the last carrier Safety Information A 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 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 any mechanical equipment personal injury can result from contact with sharp sheet metal edges Be careful when you handle this equipment Certifications SL280DFV units are CSA International certified In the USA i
83. mum 500 cfm Lennox Harmony III Zone Control Applications Minimum blower speed is 485 cfm Page 36 TABLE 20 SL280DFV Non Communicating Thermostat with Humidity Control Feature and Single Speed Outdoor Unit OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE Thermostat Demand Relative Humidity System Step Compressor Comments NO CALL FOR DEHUMIDIFICATION 24 Compressor and indoor Normal Operation 1 On On Acceptable VAC High 100 blower follow thermostat demand BASIC MODE only active on a Y1 thermostat demand Normal Operation 1 On Acceptable AC High 10096 ComfortSense 7000 thermostat energizes Y 1 Dehumidification 0 and de energizes D ona PRECISION MODE operates independent of a Y1 thermostat demand 24 Normal Operation Acceptable VAC High 100 Dehumidification mode Dehumidificati begins when humidity is TE ComfortSense 7000 ENT 1 On Demand d High 70 thermostat will try to main tain room humidity set Dm point by allowing the room Jumpers at indoor unit with a single stage outdoor unit space to maintain a cooler With Condensing unit Cut W914 R to DS on SureLight board room thermostat set With Heat Pump Cut W914 R to DS amp W951 R to O on SureLight board point 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 Precisio
84. 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 25 The seven segment diagnostic LED displays operating status target airflow error codes and other information The table beginning on Page 48 lists diagnostic LED codes Diagnostic Push Button Figure 25 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 pressed 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 holdin
85. n mode ComfortSense 7000 thermostat will maintain room temperature up to 2 F 1 2 C cooler than room setting Page 37 TABLE 21 SL280DFV Non Communicating Thermostat with Humidity Control Feature and Two Speed Outdoor Unit OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE Thermostat Demand _ Demand Relative Relative Humidity System Step Comments NO CALL FOR DEHUMIDIFICATION Normal RUN N Op m blower follow thermostat ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING BASIC MODE only active on a Y1 thermostat demand Normal Operation On Acceptable AC 70 ComfortSense 7000 thermostat energizes Y2 Dehumidification 0 m and de energizes D on a C PRECISION MODE operates independent of a Y1 thermostat demand begins when humidity is ComfortSense 7000 thermostat will try to a maintain room humidity Denemisineadon 1 On On On Demand High 70 setpoint by allowing the call ONLY SOM 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 Normal Operation 1 On Acceptable ae High 100 ComfortSense 7000 thermostat energizes Y2 Dehumidification 0 ES and de energizes D on a PRECISION MODE operates independent of a Y1 thermostat demand Dehumidifcat me jene when humidity is Dehumidification e E 7000 call ONLY On
86. ned 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 Page 6 Confined Space A confined space is an area with a volume less than 50 cu bic feet 1 42 m 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
87. nstallation 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 listed on the unit nameplate and in the tables in figure 13 Accessibility and service clearances must take precedence over fire protection clearances Installed Locations For installation in a residential garage the furnace must be installed 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
88. ode 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 SL280DFV 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 Page 22 Generator Use Voltage Requirements e furnace integrated control requires both correct The following requirements must be kept in mind when polarity and proper ground Both polarity and proper specifying a generator for use with this equipment grounding should be checked before attempting to op The furnace requires 120 volts Range 102 volts to erate the furnace on either permanent or temporary Tae vel should have a wave form distortion of less 0 operates at 60 Hz 5 Range 5
89. ormal 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 after fault recovered E200 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 55 for proper configuring under Unit Siz
90. ost 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 Applications Using A Single Stage Thermostat 4 After the 20 second warm up period has ended the gas See figure 29 for ignition control sequence valve is energized on low fire first stage and ignition oc B Heating Sequence Control Thermostat Selection curs At the same time the control module sends a sig DIP Switch 1 ON in Single Stage Position nal to begin an indoor blower 30 second ON delay NOTE In these applications two stage heat will be initi When the delay ends the indoor blower motor is ener ated by the integrated control if heating demand has not gized on the low fire heating speed and the HUM con been satisfied after the field adjustable period 7 or 12 min tacts are energized The integrated control also initi utes ates a second stage on delay factory set at 7 1 Onacall for heat thermostat first stage contacts close minutes adjustable to 12 minutes sending a signal to the integrated control The inte 5 If the heating demand continues beyond the second grated control runs a self diagnostic program and stage on delay the integrated control energizes the checks high temperature limit switches for normally combustion air inducer at high speed The control also closed contacts and pressure swi
91. ower Post off OFF Ignitor Warm up jgnition 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 high heat Conventional thermostat 30 seconds icomfort Touch thermostat set for 30 adjustable 15 to 45 seconds FIGURE 28 HEATING OPERATION WITH SINGLE STAGE THERMOSTAT 15 Ignitor Warm up 35 39 Trial Fo Ignition S on OFF heat demand low speed CAI ignitor low fire gas valve indoor blower low heat Pre Purge 5 SEC blower off delay Post Purge blower 30 second on delay 7 or 12 minutes after heating demand begins furnace switches to high fire depends 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 29 Page 43 Service AWARNING 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 electric
92. rners 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 top cap flue chase and internal flue pipe assembly from the unit 3 Label the wires from gas valve rollout switches prima ry limit switch and make up box then disconnect them Remove the screws that 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 Remove screws from both sides top and bottom of vestibule panel 9 Remove heat exchanger It may be necessary to spread cabinet side to allow more room If so remove five screws from the left side or right side of cabinet See figure 31 1 10 Back wash using steam Begin from the burner opening on each clam Steam must not exceed 275 F 11 To dean burners
93. sdiction 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 1 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 Seal any unused openings in the common venting sys supply line Gas Supply 1 This unit is shipped standard for left or right side instal lation of gas piping Connect the gas supply to the pip ing assembly tem 2 When connecting the gas supply piping consider fac 7 tors such as length of run number of fittings and fur 2 Inspect the venting system for proper size and horizontal nace rating to avoid excessive pressure drop Table 11 pitch Determine that there is no blockage restriction lists recommended pipe sizes for typical applications leakage corrosion or other deficiencies which could 3 The gas piping must not run in or through air ducts cause an unsafe condition clothes chutes gas vents or chimneys dumb waiters Close all building doors and windows and all doors be or elevator shafts tween the space in which the appliances remaining 4 The piping should be sloped 1 4 inch 6 4 mm per 15 E tothe ae feet 4 57 m upward toward the meter from the ned E PUNKT
94. switch calibration Check vent system and pressure switch wiring con 274 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 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 Indoor blower motor temperature is too high Indoor blower motor over temperature motor tripped on internal protector
95. t 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 Seer HARMONY 9 2 Eee 6 Not required on all units Page 26 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 13 SL280 Field Wiring Applications With Conventional Thermostat Continued DIP Switch Settings and On Board Links figure 25 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 27 FURNACE TERM STRIP C AG gt o 525 uz o Bot lt Mo UL gt Uh FURNACE TERM STRIP Wiring Connections HEAT PUMP outdoor sensor HEAT PUMP Thermostat Dual Fuel Single Stage Heat Pump
96. tches for normally checks the high fire second stage pressure switch to open contacts The combustion air inducer is ener make sure it is closed The high fire second stage gized at low speed gas valve is energized and the indoor blower motor is 2 Once the control receives a signal that the low pres energized for operation at the high fire heating speed sure switch has closed the combustion air inducer be 6 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 begins The indoor blower operates at the low fire a 15 second pre purge the high fire pressure switch heating speed 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 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 1 15 35 39 30 80 5 SEC blower E on 3 Trial For bl
97. tem 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 solid clears the error history Must press button while flashing 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 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 display
98. th 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 16 Common Venting Using Metal Lined Masonry Chimney ry SEALED MAX LENGTH SEE NOTE 22 is BELOW 1 5 m MIN LENGTH AS imum SHORT AS PRACTICAL 22 CHIMNEY WITH METAL Pee LINER VENT CONNECTOR 4 in 102 mm minimum PERMANENTLY SEALED FIREPLACE OPENING NOTE 1 Refer to the provided venting tables for installations FIGURE 16 DO NOCT 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 insul
99. tion 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 be manually configured to validate furnace unit size code UNIT SIZE CODE FURNACE MODEL A SL280DF070V36A b SL280DF090V48B C SL280DF090V60C d SL280DF110V60C Si sta ns Y T 7 LED 7 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
100. tor 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 firmly 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 or other areas which may be cold that portion 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 Z223 1 15 No portion of the venting system can extend into or 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 or IV venting systems 17 If vent connectors are combined prior to entering the common vent the maximum common vent capacity listed
101. tors 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 Ensure that you have made a seal between the supply air plenum and the furnace and between the furnace and the return air plenum Return Air Plenum 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 device i e wood fireplace is installed When return air is drawn from a room a negative pressure is created in the room If a gas appliance is operating in a room with negative pres sure 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 combustion and the formation of carbon monoxide gas This toxic gas might then be dis tributed throughout the house by the furnace duct sys tem A 4 inch diameter flue transition is factory installed on all models Modifying or removing the flue transition will cause the unit to operate unsafely and will void the unit certification The vent connector does not require insula tion The SL280DFV series units are
102. ways on non combustible flooring on combustible flooring using a downflow com bustible flooring base or on a reverse flow cooling cabinet Do not drag the unit across the floor Installation on Non Combustible Flooring Figure 6 1 Cut floor opening keeping in mind clearances listed on unit rating plate Also keep in mind gas supply connec tions electrical supply flue and air intake connections and sufficient installation and servicing clearances See table 1 for correct floor opening size 2 Flange warm air plenum and lower the plenum into the opening 3 Set unit over the plenum and seal the plenum to the unit 4 Ensure that the seal is adequate SL280DFV UNIT SUPPLY AIR PLENUM TABLE 1 NON COMBUSTIBLE FLOOR OPENING SIZE Cabinet Width Front to Rear Side to Side abinet Wi NOTE Door opening dimensions listed are 1 4 inch 6 mm larger than the unit opening See unit dimensions on page 2 Installation on Combustible Flooring Figure 7 1 When unit is installed on a combustible floor a down flow combustible flooring base must be installed be tween the furnace and the floor The base must be or dered separately See table 2 for opening size to cut in floor CAUTION The furnace and downflow combustible flooring base shall not be installed directly on carpeting tile or other combustible material other than wood floor ing SL280DFV UNIT SUPPLY AIR PLENUM DOWNFLOW COMBU

Lennox International Inc. DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE Furnace User Manual

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