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MULTI POSITION 90% SINGLE STAGE GAS FURNACES

1. Yadav UY ZO ALIS 340328 193880551 WVYOVIC NOILOANNOO 440 08 2011 00 Model Specifications Manufacturers Number Mfr No Rating Plate ALL Models Specifications N9MP1 N9MP1050B12C N9MP1075B12C N9MP1080F16C N9MP1100F14C N9MP1100J20C N9MP1125J20C General Gas Type Input Btuh Output Btuh Transformer Size VA T stat Heat Anticipator Temp Rise F Nat LP 50 000 45 500 40 50 35 65 Nat LP 75 000 68 000 40 50 40 70 Nat LP 80 000 72 000 40 50 35 65 Nat LP 100 000 91 000 40 50 40 70 Nat LP 100 000 96 500 40 50 40 70 Nat LP 125 000 113 750 Electrical Volts Hz FLA 115 60 9 8 115 60 8 9 115 60 9 0 115 60 9 0 115 60 10 5 115 60 11 2 Rating Plate Amps Gas amp Ignition Gas Type Gas Valve Honeywell Regulation Type IgnitionType Series Manifold Press Inch s WC Std Main No Size Furnace Controls Furnace Control Type Furnace Control Timed secs Combustion Flue Outlet Size Inches Std Outlet Temp 5 No Elbows Blower Pressure 5 No Elbows WC Blower Pressure 40 5 90 DWV Elbows WC Transition Bx Pressure 5 No Elbows WC Transition Bx Pressure 40 5 90 DWV Elbows WC Limits amp Controls Rollout Switch Limit Control Setting F Standard Pressure Sw Part No Blower Switch Pressure Close WC Blower Switch Pr
2. Does indoor blower start after ON delay Heating Cycle Operation Check No Are 115 Volts Present at control No gt 8 Neutral terminals T Replace Furnace Control Board Yes Yes Place Thermostat in DFF Removing call for Operation Check blower motor capacitor Yes and or wiring Does Indoor Blower Shut OFF After Heat Off Delay No Is Indoor Blower Hard Wired for Continuous Fan Operation Yes Proper system operation 440 08 2011 00 No Replace Furnace Control Board A Adjusting Heat Anticipator 12 Adjusting Manifold Pressure 6 Air Proving Switch See Pressure Switch B Blower Assembly Conditioned Air 26 Blower Speeds Changing 27 Blower Speeds Selecting 26 Blower Exhaust 22 Burners 9 Capacitors 26 Checking Capacitors 26 Checking Flame Current 26 Checking Grounding and Polarity 4 Checking Input Firing Rate 5 Checking Temperature Rise 11 Circulating Air Blower Data 29 Combustion Air Vent Piping 17 22 Combustion Blower See Exhaust Blower Control Wiring 12 D Diagnostics Code Section 35 Drain Trap Condensate 23 E Electrical Supply 4 INDEX Exhaust Blower 22 Flame Current Checking 26 Furnace Theory of Operation 3 Furnace Control Board 25 G Gas Valve Ignition Control Honeywell VR8205S 11 Ground Electrical
3. 07 08 9MPD STANDARD TRANSITION SWITCH MODEL PART OPEN CLOSE W C 3 dca b j PO 2 2 2 2 N 9MPD STANDARD INDUCER SWITCH MODEL PART OPEN W C CLOSE W C 125J20C 1013166 1 3 9MPD HIGH ALTITUDE TRANSITION SWITCH MODEL PART OPEN W C CLOSE W C 050B12C 1013803 075B12C 1013803 080F16C 1013813 2 2 1 1 N N N N 100F14C 1013803 100J20C 1013803 125L20C 1013157 9MPD HIGH ALTITUDE INDUCER SWITCH MODEL PART OPEN CLOSE W C To insure continued SAFE RELIABLE operation NEVER SUBSTITUTE a pressure switch with one that is similar in 2 2 1 2 2 2 1 7 Service Manual Single Stage Multi Position Furnace appearance ONLY FACTORY PROVIDED or AU THORIZED SUBSTITUTES ARE ACCEPTABLE Furnaces installed at altitudes of 4 000 above sea level or higher may require replacing the standard pressure switch with a high altitude pressure switch The different pressure switch settings allow continued SAFE RELIABLE high alti tude operation Under normal operating conditions sufficient negative pressure will be created to close the pressure switch and keep it closed to keep furnace operating Under abnormal conditions however such as a restricted vent pipe or a leak in one of the heat exchangers sufficient negative pres sure will not be created This will res
4. Grounding may be verified as follows 1 Turn the power supply OFF 2 Using an Ohmmeter check for continuity between the Neutral white wire and Ground wire green of the supply circuit 3 With the Ohmmeter set on the R x 1 scale the read ing should be zero Ohms 4 A zero Ohm reading indicates that the neutral is grounded back to the main panel 440 08 2011 00 Single Stage Multi Position Furnace Service Manual 5 An alternate check would be to check for continuity from the Neutral to a cold water pipe Pipe must be metal and must have a continuous uninterrupted connection to ground or to a continuous uninter rupted connection to ground or to a driven ground rod 6 Any readings other than zero Ohms would indicate a poor ground or no ground Polarity may be verified as follows 1 Turn the power supply 2 Using a Voltmeter check for voltage between the Hot Black and Neutral White wire of supply circuit 3 Reading should be Line Supply Voltage 4 Check for Voltage between the Neutral White wire and Ground wire of the supply circuit 5 Reading should be zero Volts if line voltage is read polarity is reversed 6 A zero Volt reading indicates there is no voltage po tential on Neutral wire 7 Double check by checking for voltage between the Hot Black wire and Ground wire of the supply cir cuit 8 Reading should be Line supply Voltage if zero volts is read
5. NOTE 2 Heating or Cooling requests received during a Fan request cause the fan speed to change to the appropriate heat or cool speed after the Fan on Delay time expires The fan returns to continuous circulating speed after the selected Fan Off Delay time expires following loss of the Heating or Cooling request Continuous Circulating Fan Hard Wired Cont Request Field selected low speed motor tap installed on CONT terminal Low speed is energized when power applied to furnace Operates at this speed continuously while there are no other blower demands from furnace control Fan demands from furnace control for heat cool or G will override hard wired speed tap NOTE 3 EAC is NOT active for hard wired mode but IS active for fan demands from furnace control for heat cool and Q Heating W Request Heating W Request 24 VAC signal applied to W terminal of FCB Inducer motor turns on and the pressure switch es close s Following a 15 second prepurge delay after the pressure switches closes the igniter begins a 17 second warm up The gas valve is energized the main burners light and flame is sensed The igniter is de energized after the main burners ignite FCB will delay blower operation for the 30 seconds timed from the opening of the gas valve W signal removed from FCB The gas valve de energizes and the main burners go out The inducer runs for a 15 second postpurge period The fan stays at Heat speed
6. The fan de energizes after the selected Heat Fan Off Delay time expires timed from the gas valve de energizing HUMIDIFIER The 24V HUM is energized when the pressure switch closes a call for heat The 115V HUM called HUM on Control is energized when the inducer is energized ELECTRONIC AIR CLEANER EAC is energized when there is a blower speed call It is NOT energized when blower operates the hard wired continuous fan mode NOTE 4 If anew Heating request arrives while the control is waiting in the Heat Fan Off Delay time the FCB will wait for the selected Heat Fan Off Delay then start a new heating cycle as long as the heat call remains 440 08 2011 00 Single Stage Multi Position Furnace Service Manual Heating Request with Gas Shut Off 24 VAC signal applied to W terminal of FCB The FCB will attempt 4 cycles for ignition then go to soft lockout for 3 hours then try for ignition again as long as the heat call remains Power reset will clear lockout Inducer motor turns on Following a 15 second prepurge delay the igniter begins warm up The igniter glows red hot for 22 seconds then turns off The FCB flashes error code 6 The igniter stays off for 17 seconds then begins to warm up again The igniter glows red hot for 22 seconds then turns off The FCB continues flashing error code 6 The igniter stays off for 17 seconds then begins to warm up again The igniter glows red hot for 22 seconds then turns off T
7. Vent Pipes MUST be supported Horizontall and Vertically VENT PIPE atmospheric zone Increase minimum from 8 to 18 for cold climates sustained temperatures below 0 F 25 23 33a 440 08 2011 00 Single Stage Multi Position Furnace Service Manual VENT COMBUSTION AIR PIPING Vent and combustion air piping are an extremely important part of the total furnace installation Improperly installed or inadequately sized vent and or combustion air piping can be the source of many perceived furnace problems For example most problems associated with pressure switch operation can normally be traced to short comings in the vent and or combustion air piping Anytime these type problems arise a thorough inspection of the vent and or combustion air piping should be conducted ALL MODELS require a vent exhaust pipe to carry flue products to the outside of the structure Direct VENT ONLY models require a combustion air inlet to bring in all air for combustion from outside the struc ture DUAL CERTIFIED models require a combustion air inlet pipe to bring in all air for combustion from outside the struc ture only when installed as a Direct Vent Furnace Two Pipe Installation Consult the appropriate Venting tables and or piping chart for the model you are servicing STANDARD VENT TERMINATION Vent Combustion Air Piping Ch
8. Med Lo BL DO NOT USE Lo RED DO NOT USE 440 08 2011 00 CIRCULATION AIR BLOWER DATA For 050 Models 3 Ton Units gtk Low MedL MedH Hi o 0 1 826 1083 1301 1408 0 2 804 1050 1242 1347 5 0 3 770 1028 1195 1295 xo 0 4 735 985 1153 1237 2 E 0 5 698 952 1093 1183 0 6 657 909 1040 1118 E 0 7 863 935 1053 0 8 812 865 976 0 9 nm 802 887 1 0 m nae 720 787 For 075 Models 3 Ton Units Ee Low MedL MedH Hi 0 1 706 917 1163 1368 0 2 677 875 1120 1319 5 0 3 636 840 1076 1263 xo 0 4 595 812 1031 1202 5 0 5 546 766 987 1148 0 6 490 702 889 1077 E 0 7 630 821 989 0 8 a 550 750 914 0 9 462 676 833 1 0 m T 601 747 For 100 Models 3 5 19 amp 223 Units s Low MedL MedH Hi 5 0 1 700 912 1209 1550 o 0 2 660 884 1171 1492 0 3 616 843 1139 1434 E 2 0 4 575 790 1088 1378 55 0 5 528 735 1040 1317 3 0 6 472 677 979 1247 0 7 608 909 1161 0 8 m 528 827 1058 0 9 733 932 1 0 624 778 For 080 Models 4 19 amp 223 4 Units poris Low MedL MedH Hi 0 1 823 1109 1527 1850 0 2 795 1087 14
9. Notes 1 The vent for this appliance shall not terminate a Over public walkways or b Near soffit vents or crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or property damage or Where condensate vapor could cause damage or could be detrimental to the operation of regulators relief valves or other equipment When locating vent terminations consideration must be given to prevailing winds location and other conditions which may cause recirculation of the combustion products of adjacent vents Recirculation can cause poor combustion inlet condensate problems and accelerated corrosion of the heat exchangers 440 08 2011 00 21 Service Manual Single Stage Multi Position Furnace Figure 18 Standard Termination Conceniric Vent and Combustion S Rooftop Termination Air Sidewall Termination Inlet is optional on gt 1 Maximum atus a Dual Certified models Combustion 2 Sos Cnn gt SNE LNG 25 Exhaust A 12 Above roof or snow accumulation level 5 00 06 25 22 02d B 8 Min 20 Maximum except in areas with extreme cold Dimension A is touching or 2 maximum separation temperatures sustained below 0 F the 18 Min Sidewall Termination 12 or More Above Snow Level or Grade Level 18 Minimum for cold climates sustained below 0 F 8 Min 20 Max D 18 Min for Cold Climates 12 Min Grade _ Sustained Below 0 25 00 0
10. 2 2 1013803 2 0 1 8 11 8 10 850 1 5 7 5 370 16x25x1 11 5 2 21 5 3 10 1 1013801 2 3 1013803 2 0 1 8 0011 1013518 1 0 0 8 2 0 1 8 0031 1013165 0 7 0 6 14 12 11 8 8 0 1050 1 5 7 5 370 16x25x1 11 5 2 21 5 3 12 9 L P VR 10 1 Nat 8205S SNAP Hot Surface Integrated 30 60 100 140 180 11 10 10 1050 1 5 10 370 16x25x1 21 5 3 31 5 4 1013801 2 3 1013803 2 0 1 8 0011 1013518 1 0 0 8 2 0 1 8 11 10 10 1050 1 5 10 370 16x25x1 11 5 2 3 3 5 144 1013802 22 1013803 2 0 1 8 0011 1013518 1 0 0 8 2 0 1 8 0031 1013165 0 7 0 6 14 12 11 10 13 900 8 4 40 370 16x25x1 31 5 4 41 5 5 15 0 1013166 1 3 1 1 1 8 1 6 1013157 0 9 0 7 1 7 1 5 11 10 13 900 8 4 40 370 16x25x1 31 4 41 5 5 440 08 2011 00 Manufacturers Number Mfr No Rating Plate ALL Models Specifications 9MPD 9MPDO050F12C 9MPD075F12C 9MPD080J16C 9MPD100J14C 9MPD100J20C 9MPD125L20C General Gas Type Input Btuh Output Btuh Transformer Size VA T stat Heat Anticipator Temp Rise F Nat LP 50 000 46 000 40 50 35 65 Nat LP 75 000 69 000 40 50 40 70 Nat LP 80 000 73 600 40 50 35 65 Nat LP 100 000 92 00
11. 400 x 2 800 CFM required Checking the blower performance data see Table 12 for this model indicates that 0 4 W C ESP low speed will deliver 788 CFM Accordingly low speed should be used in this example for the COOLING speed 440 08 2011 00 Table 12 Blower Performance Data a9 e 75 0000 BTUH Air Delivery in Cubic Feet per Minute CFM Furnace Rated 9 0 5 W C ESP TAP LOW MEDL MEDH HIGH 10 778 984 1263 1576 20 786 1249 1532 130 790 1244 1489 40 788 1215 1432 Inches of W C 50 781 982 1186 1371 External Static Pressure 60 765 962 1146 1308 70 743 923 1094 1229 SAMPLE ONLY Table 13 Blower Speed Chart Wire Color Motor Speed Black High Orange Med High Blue Medium Red Low Med High speed may not be provided on all models CHANGING BLOWER SPEEDS 1 Referto Furnace Wiring Diagram for location of the heating and cooling speed taps located on the furnace control as well as location of unused blower motor speed leads Use the chart Table 13 to determine the blower motor speed settings 2 Change the heat or cool blower motor speed by removing the motor lead from the Heat or Cool terminal and re place it with the desired motor speed lead from the Unused Motor Lead location Connect the wire previously removed from the Heat or Cool terminal to the vacated Unused Motor Lead termina
12. 7215 01 3803 0102 33002 4 1 43345 0 801 asn s jueuudinbo y jo Aue j oo o HEAT OFF DELAY 130 OW NO 531935 NICOLL HILIMS 39055394 2 n DVAvZ 9 ILON NIYW 2VAVC AWO NV vs 3snd NO 1002 1 3 UJINHOSSNV HE 531935 NI Ol tL HDLIMS 1101108 DVASLL 7215 001 u3MO18 254 5 81 CAPACITOR DVASLL 5 E a o o W 74 2 OFF DELAY RLOCK CAPACITOR NOILONR f 1002 1 3 14 1 YOSN3S 4 amp O M 14 ILON NOILINSI ILON 31ON NO 5 3WOS yOLOW A NSS 531935 011 YOLIDVdVD H21IMS 39155394 M an HOLIMS i 10H 59 WwaLlnaNn awos 9351 aasiNaHM Ci 1 TOH AINO H21IMS SSA NIVIN ROM NO 531935 NI 123NNO2SIG 01313 2VASLL OL SYOLINGNOD 34402 285524441 TOL 1NOTIOY INTE SWITCH HEAT OFF DELAY NOTE 2 EAC HUM 1 0A MAX COMBINED COOL ON DELAY 5 SEC COOL OFF DELAY 90 SEC HEAT ON DELAY 30 SEC
13. NO YOLINANOD Jaye jesaJ ojne joquog uonubi Q13l4 JDVLIOA 3NIT 10 sjeu nJsseoonsun eAngnoesuoo INOJ INDIO AYOLIVA ADVLIOA 3NIT 06 jeeu Jo OSL pue Op OOL 09 ee suonoejes Buneeu seb Aejop jjo samog 91313 39V110A jou aue 105 lt 2 AYOLIVA JDVLIOA pue 4 peeds uunuundo uo 10 suonipuoo 10 suogoejes paads MOTIAA esnj dwe e uj 3LIHM pueBe se 3 ON UH O1 qaad pue pejuud pJeoq seul NNY9 MomawNi3ss 3n18 uogejueseJdai sioqui S 4 8 ILON 88 IHW iano 2 0 JSNW SIUL 1 ALON 5 35 CIRCUIT BOARD NOTE 5 7235 081 OFF DELAY HDLIMS 55384 1 yovia 2 18 uonounf WAH ALES y pue YO IMS 1oeuuoosip y UBEMjaq Jeddoo esf
14. Recirculation can cause poor combustion inlet condensate problems and accelerated corrosion of the heat exchangers 440 08 2011 00 Single Stage Multi Position Furnace Service Manual Figure 17 Other than Direct Vent Termination Clearance 25 24 65 2 VENT TERMINAL SUPPLY INLET ESS AREA WHERE TERMINAL IS NOT PERMITED Clearance Descriptions Canadian Installation 1 U S Installation 2 A Clearance above grade veranda porch deck balcony or 12 30cm 12 30 cm anticipated snow level Clearance to a window or door that may be opened 6 15 cm for appliances lt 10 000 BTUH 3kW 12 30 4 1 2 below or to the side of the opening 1 30 cm for appliances gt 10 000 Btuh 3 kW and lt 100 000 Btuh above the opening 30 kW 36 91 cm for appliances gt 100 000 Btuh 30 kW Vertical clearance to a ventilated soffit located above the ter minal within a horizontal distance of 2 61cm from the cent erline of the terminal Clearance to each side of the centerline extended above elec 3 91 cm within 15 4 5 m above the meter regulator 3 91 cm within 15 4 5 m above the meter regulator trical meter or gas service regulator assembly assembly assembly Clearance to service regulator vent outlet 3 91 cm Clearance to non mechanical air supply inlet to building or the 6 15 cm for appliances lt 10 000 BTUH 3kW 12 30 4
15. and other safety precautions that may apply Follow all safety codes In the United States follow all safety codes including the current edition National Fuel Gas Code NFGC ANSI Z223 1 2002 NFPA No 54 2002 In Canada refer to the current edition of the National Standard of Canada Natural Gas and Propane Installation Code NSCNGPIC CSA B149 1 05 Wear safety glasses and work gloves Have fire extinguisher available during start up and adjustment proce dures and service calls These instructions cover minimum requirements and conform to existing national standards and safety codes In some instances these instructions exceed certain local codes and ordinances especially those that may not have kept up with changing residential construction practices We require these instructions as a minimum for a safe installation International Comfort Products LLC Lewisburg TN 37091 440 08 2011 00 Single Stage Multi Position Furnace Service Manual UNIT IDENTIFICATION The unit s rating plate contains important information for the service technician It also lists the complete Model Manufacturing and Serial Numbers These complete numbers are required to obtain correct re placement parts example in certain model families a unit having a MARKETING REVISION of C is likely to be equipped with one or more different components MODEL NUMBER IDENTIFICATION GUIDE Brand Identifier T Tempstar C Comfortmaker H Heil A A
16. different models Be certain you have the correct control for the model you are servicing ROLL OUT LIMIT A Normally Closed switch wired in series with the Main Limit switch mounted on both sides of the burner box This switch is a manual reset type When replacing this switch be absolutely certain the correct one is used Figure 12 Typical Roll Out Limit Switch A CAUTION NEVER use an automatic reset roll out switch to replace a manual reset type roll out switch Doing so may cause potentially unsafe and or intermittent operation The roll out switch monitors the temperature inside the burner box and interrupts furnace burner operation when its temperature indicates flame roll out has occurred Once the roll out switch has opened burner operation will be prevented until the roll out switch is Manually Reset by pressing the red button located on the switch While the roll out switch is open the combustion blower and circulating blower will be energized continuously If the roll out switch has opened the cause must be deter mined Some possible reasons for flame roll out include a restricted primary or secondary heat exchanger or over fired furnace PRESSURE SWITCHES Transition Pressure Switch An air proving switch pressure switch is used on all mod els to insure that a draft has been established through the heat exchanger before allowing burner operation All models use a single tap port
17. direct drive blower assembly Different size HP motors and or different diameter blower wheels are used in each model to obtain the required air flow The entire blower assembly slides out on rails for servicing after removing the two screws at the front and disconnecting the harness con nectors from the furnace control board SELECTING BLOWER SPEEDS The wide variety of applications and installations of fur naces throughout the country makes it impossible to Fac tory Select blower speeds that will provide proper opera tion for all installations This means then that the blower speeds for both heating and cooling must be Field Se 440 08 2011 00 Single Stage Multi Position Furnace Service Manual lected for each particular installation to insure proper op eration The criteria for selecting the proper blower speeds IS NOT High for Cooling Low for Heating Although that may be how it works out SOMETIMES it can in many cases be exactly the opposite a Lower speed for Cooling and a Higher speed for Heating The PROPER CRITERIA FOR SELECTING BLOWER SPEEDS is as follows HEATING A blower speed must be selected that will provide proper temperature rise through the furnace See checking tem perature rise found elsewhere in this manual The re quired CFM for a particular temperature rise can also be calculated using the following formula Output BTU Temp Rise X 1 08 CFM EXAM
18. in the installation manual Condensate Drain Trap Freeze Protection Special precautions MUST be made if installing furnace in an area which may drop below freezing This can cause im proper operation or damage to the equipment If the the fur nace environment has the potential of freezing the drain trap and drain line must be protected Use 3 to 6 watt per foot at 115 volt 40 F self regulating shielded and water proof heat tape Wrap the drain trap and drain line with the heat tape and secure with the ties Follow the heat tape manufacturer s recommendations Service Manual Single Stage Multi Position Furnace Sequence of Operation amp Diagnostics The following is the normal operating sequence Cooling Y Request 24VAC signals applied to Y amp G terminals of FCB furnace control board Cool motor speed is energized after 5 second Cool Fan On Delay time Y amp signals removed from FCB Cool motor speed is de energized after 90 second Cool Fan Off Delay time Continuous Circulating Fan G Request 24 VAC signal is applied to G terminal of the FCB Heat motor speed is energized without delay G signal removed from FCB e Heat motor speed is de energized after 5 second delay NOTE 1 Furnace de energizes the fan during the heat exchanger warm up period on a call for Heating that occurs during a G request unless a blower motor lead is connected to the Cont terminal on the FCB in which case see NOTE 2
19. the inlet pressure MUST be a minimum of 11 W C If this cannot be obtained problems are indicated in either the regulator or pipe sizing CHECKING INPUT FIRING RATE Once it has been determined that the gas supply is correct to the furnace it is necessary to check the input firing rate This can be done in two 2 ways First by checking and ad justing as necessary the manifold Outlet pressure The second way is to Clock the gas meter A WARNING FIRE OR EXPLOSION HAZARD Turn OFF gas at shut off before connecting manometer Failure to turn OFF gas at shut off before connecting manometer can result in death personal injury and or property damage Service Manual Figure3 Gas Pressure Testing Devices Pressure Connections ae INCHES OF WATER A AGNEHELIC PRESSURE 15 PSIG Typical U Tube Manometer CHECKING MANIFOLD PRESSURE NOTE Make adjustment to manifold pressure with burners operating 1 Remove the burner compartment door 2 With gas OFF connect manometer to outlet tapped opening on gas valve Use manometer with a 0 to 15 water column range 3 Turn gas on Remove the blower compartment door Operate the furnace by jumpering R to W on the fur nace control board 4 Remove manifold pressure adjustment screw cover on furnace gas control valve Turn adjusting screw counterclock
20. there is no ground or polarity is re versed INTERLOCK SWITCH Typical Interlock Switch The blower compartment door of all models is equipped with an interlock switch See Figure 2 This switch is Nor mally Open closes when the door is on the furnace and interrupts furnace operation when the door is open This in terlock switch is a safety device and SHOULD NEVER BE BY PASSED Since this is a single pole switch breaking only one side of the line proper line polarity is essential to insure that fur nace components are not HOT when switch is open See Checking Grounding and Polarity 10 12 96 GAS SUPPLY An adequately sized gas supply to the furnace is required for proper operation Gas piping which is undersized will not provide sufficient capacity for proper operation Piping should be sized in accordance with accepted industry stan dards Refer to NFGC and ANSI Z223 1 for proper gas pipe size NATURAL GAS Inlet Supply pressure to the furnace should be checked at the gas valve with ALL OTHER GAS FIRED APPLIANCES OPERATING Inlet Supply pressure to the furnace under these conditions MUST be within minimum and maximum values listed on rating plate If the inlet pressure is less it may be an indication of undersized piping or regulator prob lems 440 08 2011 00 L P GAS Inlet Supply pressure to the furnace should be checked in the same manner as for Natural Gas however with L P Gas
21. these checks Remove tape when finished NOTE A Heartbeat is defined as the diagnostics LED flashing continually from bright to dim 440 08 2011 00 Single Stage Multi Position Furnace Service Manual Troubleshooting Chart 2 Start Cooling Cycle Place Thermostat switch Operation Check in AUTO position Place Thermostat in COOL and calling for operation Does indoor blower run on N gt Are 24 Volts present NO Are 115 Volts present across kd Check supply circuit Cooling speed across R and transformer primary terminals terminals Yes Yes Check Transformer No Are 24 Volts present across 00 Thermostat and and Y terminals thermostat wiring Yes Are 115 Volts present across _ Replace Control Board Cool and Neutral terminals Yes Check Blower Motor capacitor and wiring Does Condensing unit run Check Condensing unit control wiring amp supply circuit Yes Place Thermostat in OFF removing call for operation Does indoor blower shut j No Indoor blower remains No Indoor blower shuts m gt running continuously down immediately Delay 90 seconds Yes Yes Yes Is Indoor Blower No
22. to properly install orifices could result in death personal injury and or property damage Turn OFF electric power at disconnect and gas supply at manual valve in gas line when installing orifices Installation of orifices requires a qualified service technician 440 08 2011 00 NOTE Main burner orifices can be changed for high alti tudes 1 Disconnect gas line from gas valve 2 Remove manifold from furnace 3 Remove the orifices from the manifold and replace them with properly sized orifices 4 Tighten the orifices so they are seated and gas tight approximately 1 g from the face of the orifice to the back of the manifold pipe See Figure 6 Make sure orifice is installed straight so that it forms a right angle 90 to the manifold 5 Reinstall manifold Ensure burners do NOT bind on new orifices Measure from face of orifice to the back side of the manifold 11 8 to 13 46 ed all dimensions are in inches 1 4 NOTE Flame sensor has a different orientation for all 050 models and alternate 040 input High Altitude Installation Gas input rate on the furnace rating plate is for installation at up to 2000 The 54 burner orifices supplied in this kit are sized for Pro pane Gas at full rate ONLY for use between 0 2000 elevation Do not use them above 20
23. via convection This Serpentine path is resistive to normal convective flow and requires that a partial vacuum be created at the outlet of the heat exchanger to maintain the flow of flue products through the heat exchanger 2 The serpentine heat exchanger design does not lend itself well to the ribbon type or slotted port type burner found in more traditional design furnaces for the fol lowing reasons A The secondary combustion airflows at right angles to the burner flame making it likely to pull the flame off a ribbon or slotted port type burner 440 08 2011 00 B The flame height of a ribbon or slotted port type burner would make it difficult if not impossible to prevent impingement of the flame on the heat ex changer surfaces whole maintaining the low profile heat exchanger For these reasons an INSHOT type burner is used in this series The inshot burner also called a jet burner fires a flame straight out its end This burner is designed to fire into a tube style heat exchanger making it an ideal application in the tube like passages of the serpentine heat exchanger 3 In order to extract the maximum amount of heat pos sible from the flue gasses a secondary heat ex changer condenser is connected to the outlet of the primary heat exchanger This condenser removes additional heat from the flue gasses causing their temperature to drop below dew point This results in the forming of condensation
24. 0 40 50 40 70 Nat LP 100 000 92 000 40 50 40 70 Nat LP 125 000 115 000 Electrical Volts Hz 115 60 115 60 115 60 115 60 115 60 115 60 Rating Plate Amps Gas amp Ignition Gas Type Gas Valve Honeywell Regulation Type IgnitionType Series Manifold Press Inch s WC Std Main No Size Furnace Controls Furnace Control Type Furnace Control Timed secs Combustion Flue Outlet Size Inches Std Outlet Temp 5 No Elbows Blower Pressure 5 No Elbows WC Blower Pressure 40 45 90 DWV Elbows WC Transition Bx Pressure 5 No Elbows WC Transition Bx Pressure 40 5 90 DWV Elbows WC Limits amp Controls Rollout Switch Limit Control Setting F Standard Pressure Sw Part No Blower Switch Pressure Close Blower Switch Pressure Open Transition Switch Pressure Close Transition Switch Pressure Open High Altitude Pressure Sw Part No Blower Switch Pressure Close Blower Switch Pressure Open Transition Switch Pressure Close WC Transition Switch Pressure Open WC Long Vent Kit Part No Pressure Switch Part No Blower Switch Pressure Close Blower Switch Pressure Open Transition Switch Pressure Close WC Transition Switch Pressure Open WC High Altitude Long Vent Kit Part No Pressure Switch Part No Blower Switch Pressure Close Blower Switch
25. 0 370 16x25x1 21 5 3 31 5 4 1013801 2 3 2 1 1013803 2 0 1 8 1013518 1 0 0 8 2 0 1 8 11 10 10 1050 1 5 10 370 16x25x1 11 2 2 3 31 2 0011 144 1013802 2 2 2 0 1013803 2 0 1 8 0011 1013518 1 0 0 8 2 0 1 8 0031 1013165 0 7 0 6 14 12 11 10 13 900 8 4 40 370 16x25x1 31 5 4 41 5 5 15 0 1013166 1 3 1 1 1 8 1 6 1013157 0 9 0 7 1 7 1 5 11 10 13 900 8 4 40 370 16x25x1 31 5 4 41 5 5 Manufacturers Number Mfr No Rating Plate ALL Models Specifications 2 N9MP2050B12C N9MP2075B12C N9MP2080F16C N9MP2100F14C N9MP2100J20C N9MP2125J20C General Gas Type Input Btuh Output Btuh Transformer Size VA T stat Heat Anticipator Temp Rise F Nat LP 50 000 45 500 40 50 35 65 Nat LP 75 000 68 000 40 50 40 70 Nat LP 80 000 72 000 40 50 35 65 Nat LP 100 000 91 000 40 50 40 70 Nat LP 100 000 96 500 40 50 40 70 Nat LP 125 000 113 750 40 50 40 70 Electrical Volts Hz FLA 115 60 9 8 115 60 8 9 115 60 9 0 115 60 9 0 115 60 10 5 115 60 11 2 Rating Plate Amps Gas amp Ignition Gas Type Gas Valve Honeywell Regulation Type Ignition Type Series Manifold Press Inch s WC Std Main Orifices No Size Furnace Controls Furnace Contr
26. 0 Btuh 15 30 kW 36 91 cm for appliances gt 100 000 Btuh 30 kW kW 12 30 cm for appliances gt 50 000 Btuh 15 kW elias lia Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 2 61cm from the centerline of the terminal Clearance to each side of the centerline extended above 3 91 cm within 15 4 5 m above the meter regulator 3 91 cm within 15 4 5 m above the meter regulator electrical meter or gas service regulator assembly assembly assembly Clearance to service regulator vent outlet 3 91 cm Clearance to non mechanical air supply inlet to building or the 6 15 cm for appliances lt 10 000 BTUH 3kW 9 23 6 15 cm for appliances lt 10 000 BTUH 3kW 9 23 cm combustion air inlet to any other appliance for appliances gt 10 000 Btuh 3 kW and x 100 000 Btuh 30 for appliances gt 10 000 Btuh 3 kW and lt 50 000 Btuh 15 kW and lt 50 000 Btuh 15 kW 12 30 cm for appliances kW 12 30 cm for appliances gt 50 000 Btuh 15 kW gt 50 000 Btuh 15 kW Clearance to a mechanical air supply inlet 6 1 83 3 91 cm above if within 10 3m horizontally Clearance under a veranda porch deck or balcony 12 30 cm Clearance to each side of the centerline extended above 12 30 cm 12 30 cm below vent terminal of the furnace to a dryer or water heater vent or other a
27. 00 except when noted by Table 3 or Table 5 Orifices for conversion at high altitude and alternate input must be ordered from Service Parts Standard Input Units may be installed at full input rating 25 000 BTUH per heat exchanger when installed at altitudes up to 2000 80 000 BTUH model and Alternate Input Conversions See unit instructions to determine if model may be converted to alternate in put Units may be installed at full input rating 20 000 BTUH per heat exchanger when installed at altitudes up to 5000 11 Service Manual Single Stage Multi Position Furnace In the USA for furnaces fired on standard rate the input rating for altitudes above 2000 5 000 for 80 000 BTUH and alternate in _ Table 6 Alternate Input Ratings USA ONLY put must be derated by 4 for each 1000 above sea level see BTUH BTUH Table 3 and Table 5 Standard Alternate In Canada the input rating for altitudes above 2000 5 000 for Rating Rating Orifice 80 000 BTUH must be reduced by 10 for altitudes of 2000 to 50 000 40 000 4500 above sea level Use the 2001 to 3000 column in Table 3 75 000 60 000 and Table 5 100 000 80 000 Alternate BTUH Input Ratings USA Only 125 000 100 000 The input rating of these furnaces can be changed from the stan dard put atta to the alternate input rating shown in Table 6 by See Table 5 for High Altitude changing the main burner orifices Changing of burner orif
28. 1 41 41 u ALN 41 6 41 4 3 EN 4 1 3 41 7 a w ALD 3 1 N N N aj N oo 4 32 no as ss 25 4 32 1 NOTE Natural gas data is based on 0 60 specific gravity For fuels with different specific gravity consult the National Fuel Gas Code ANSI Z223 1 2002 NFPA 54 2002 or National Standard of Canada Natural Gas And Propane Installation Code CSA B149 1 05 Bold indicated the factory shipped orifice size 42 Table 3 LPG or PROPANE GAS MANIFOLD PRESSURE w c FOR THE 90 80 000 BTUH MODEL AND ALTERNATE INPUT RATINGS HEATING VALUE MEAN ELEVATION FEET ABOVE SEA LEVEL at ALTITUDE 0 to 2001 to 3001 to 4001 to 5001 to 6001 to 7001 to BTU CU FT 2000 3000 4000 5000 6000 7000 2500 s 6 m f NOTE Propane data is based on 1 53 specific gravity For fuels with different specific gravity consult the National Fuel Gas Code ANSI Z223 1 2002 NFPA 54 2002 or National Standard Of Canada Natural Gas And Propane Installation Code CSA B149 1 05 NOTE The derating of these furnaces at 296 Natural Gas and 4 Propane Gas has been tested and design certified by CSA In Canada the input rating must be derated 596 Natural Gas and 1096 Propane Gas for altitudes of 2 000 to 4 500 above sea level Use the 2001 to 3000 column in Table 2 Table 3 Table 4 and T
29. 1 2 below or to the side of opening 1 30 cm above combustion air inlet to any other appliance cm for appliances gt 10 000 Btuh 3 kW and lt 100 000 opening 30 kW 36 91 cm for appliances gt 100 000 Btuh 30 kW Clearance to a mechanical air supply inlet 6 1 83 m 91 cm above if within 10 3m horizontally x Clearance under a veranda porch deck or balcony 12 30 cm 3 Clearance to each side of the centerline extended above or below vent terminal of the furnace to a dryer or water heater vent or other appliance s direct vent intake or exhaust 3 Clearance from a plumbing vent stack 3 91 cm 91 cm k k Clearance above a paved sidewalk or paved driveway located 7 2 13 7 2 13 m on public property In accordance with the current CSA B149 1 Natural Gas and Propane Installation Code In accordance with the current ANSI Z223 1 NFPA 54 National Fuel Gas Code 18 46 cm above roof surface Permitted only if veranda porch deck or balcony is fully open on a minimum of two sides beneath the floor For clearances not specified in ANSI Z223 1 NFPA 54 or CSA B149 1 clearances shall be in accordance with local installation codes and the requirements of the gas supplier and the manufacture s installation instructions A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings
30. 2 12 CONTROL WIRING i i donc ae rain um yale ee eee nep Sees us o aet 12 19 TWINNING KUT Sco setae reece dE Rx x ER EU wea RERO Rc 13 LIMIT SWIECHES s oer s b nn tp ent ao a dene or et dh op dire 13 15 PRESSURE SWITCHES zye e ae ehh ed oS 14 16 HIGHER LOWER NEGATIVE PRESSURES 16 17 VENT COMBUSTION AIR PIPING 17 18 STANDARD VENT TERMINATION 17 19 CONCENTRIC VENT 21 20 COMBUSTION BEOWBERLU s dara tour d ade neues 22 21 CONDENSATE DRAIN TRAP 2 2 exes ode ua en ERA ete eda eee RUE 23 22 SEQUENCE OF OPERATION oti avs teks Metta RUE EUR Rr eR XR EE RR E EE 24 23 CHECKING FLAME CURRENT cube ihe e vee Rube n al a 26 24 CAPACITORS EE 26 25 BLOWER ASSEMBLY seam rene EE E 26 BLOWER PERFORMANCE 2 227 eect GE 29 WIRING DIAGRAM Sinead one ab Fa m wee ead 30 TECHNICAL SERVICE DATA N9MP1 1 31 TECHNICAL SERVICE DATA N9MP2 1 32 TECHNICAL SERVICE DATA 9MPD C1 33 TROUBLE SHOOTING GUIDE xm aote p
31. 4 H Heat Anticipators 12 High Altitude Operation 9 Interlock Switch 5 Introduction 1 K Kits Twinning 13 L Limit Switches 13 Pressure Switch 10 Piping Vent Combustion Air 17 22 Polarity Line Voltage 4 Pressure Switches 14 15 Pressures Approximate Operating 14 R Roll Out Limit Switch 14 Room Thermostat 12 5 Sequence of Operation Chart 24 Supply Electrical 4 Supply Gas 5 Switch Blower Door Interlock 5 Switch Transition Pressure 14 Switch L P Gas Pressure 10 Switch Main Limit 13 Switch Pressure 14 15 Switch Roll Out Limit 14 Switches Limit 13 T Technical Service Data 31 33 INDEX Temperature Rise 11 Thermostat Room 12 Transition Pressure Switch 14 Troubleshooting Charts 34 39 Troubleshooting Guide 13 Twinning Kits 13 U Unit Identification 3 V Vent Termination Concentric 21 Vent Termination Standard 17 21 Vent Combustion Air Piping 17 W Wiring Diagram 30 Wiring Control 12
32. 48 75 000 BTUH 3 Time how many seconds it takes the smallest nor mally 1 cfh dial on the gas meter to make one com plete revolution Refer to Example compartment and blower 4 Relight all appliances and ensure all pilots are operat ing NOTE If meter uses a 2 cubic foot dial divide results sec onds by two Alternate BTUH Input Ratings USA Only The input rating of these furnaces can be changed from the standard input rating to the alternate input rating shown in Table 1 by changing the main burner orifices Changing of burner orifices MUST be done by a qualified service techni cian See section on changing orifices on page 9 Table 1 BTUH Standard Rating Alternate Input Ratings USA ONLY BTUH Natural LP Alternate Gas Gas Rating Orifice Orifice See Table 4 for High Altitude See Table 5 for High Altitude 440 08 2011 00 Single Stage Multi Position Furnace Service Manual MANIFOLD PRESSURE AND ORIFICE SIZE FOR HIGH ALTITUDE APPLICATIONS Table 2 NATURAL GAS MANIFOLD PRESSURE w c MEAN ELEVATION FEET ABOVE SEA LEVEL HEATING Oto 2001 to 3001 to 4001 to 5001 to at ALTITUDE Manifold Orifice Orifice Orifice Manifold BTU CU FT No Pressure No Pressure No Pressure No Pressure No Pressure 700 75 70 750 eel 6001 to 7000 Manifold Pressure 7001 to 8000 Manifold Pressure Orifice No Orifice No 4
33. 5F or Snow Level Dimension A is touching or 2 maximum separation GRADE LEVEL SNOW LEVEL Sidewall Inlet Vent and Exhaust Air Termination with Exterior Risers 18 Min for Cold Climates Sustained Below 0 F 12 Min Grade or 12 Min Grade or Snow Level Dimension is touching or 2 maximum separation Dimension is touching or 2 maximum separatior 22 440 08 2011 00 Single Stage Multi Position Furnace Service Manual Rooftop Inlet Vent and Exhaust Air Recommended Alternate Installa tion for Sustained Cold Weather cat 0 F amp below 18 Min for Cold Climates Sustained Below 0 F Min 20 Max 12 MIN don C EXHAUST 12 MIN Ground Level OR Snow Level 25 23 73 FRONT VIEW SIDE VIEW 1 nl NND Same Joist Space CONCENTRIC VENT TERMINATION Vent Combustion Air Piping Charts Concentric Termination Kit Concentric Vent Dimensional Table 11 NAHAO01CV amp NAHAOO2VC Venting Drawing Table for 9MPD BP 50 000 amp 75 000 Btuh Furnaces Vent Exhaust NAHAOO2CV 35 amp 4 90 elbows with 2 PVC pipe x 01 65 amp 4 90 elbows with 3 PVC pipe 1 Do not include the field supplied 45 elbow in the total elbow XY count P 2 If more than four elbows are required reduce the length of both the inlet and the exha
34. 82 1791 0 3 747 1056 1426 1720 E 9 0 4 677 1016 1382 1648 0 5 617 970 1317 1575 2 8 0 6 544 854 1245 1485 0 7 763 1154 1401 5 0 8 652 1043 1284 m 0 9 um is 905 1161 1 0 Pas es 737 1028 For 100 Models 5 Ton 223 4 Units poem Low MedL MedH Hi 0 1 1682 1870 2081 2263 0 2 1654 1826 2081 2193 5 0 3 1597 1775 1963 2165 Sg 0 4 1547 1719 1899 2056 g 0 5 1498 1653 1825 1978 2 0 6 1428 1583 1737 1854 59 07 1355 1503 1650 1757 5 0 8 1267 1392 1548 1644 E 0 9 E 1266 1428 1515 1 0 Em Bc 222 1351 For 125 Models 5 Ton Units 78 Low MedL Hi 0 1 1720 1910 2127 2315 e 0 2 1686 1881 2087 2268 3 g 03 1644 1833 2024 2201 5 1600 1777 1961 2131 5 2 0 5 1533 1720 1891 2029 55 06 1494 1647 1804 1948 5 0 7 1413 1571 1708 1820 0 8 1306 1470 1604 1730 0 9 1349 1484 1614 1 0 uec 1328 1430 440 08 2011 00 Diagram Wiring JAND OM JO 8 101 6070t 1081NO2 YL 10 YLNOD J0j euuoo e eq Aew uo Bulpusdeq TWNIWYAL YVWNN yeurwou 0 02 vr 2 0 swej NI NOILDNAL jeseJ ojne urejuoo Jeonpul pue 10 1 02
35. EDIATELY following the igniter warm up peri od 17 seconds 24 Volts will be present ONLY for a period of 7 seconds after the igniter warm up if flame is not proven If 24 Volts is present during the above check and the valve will NOT open then replace the valve If 24 Volts IS NOT present problems are indicated in the control and or wiring to the gas valve HIGH ALTITUDE OPERATION These furnaces are designed to operate in the majority of the country without modifications At altitudes over 2 000 above sea level however certain measures need to be tak en to insure continued safe reliable operation For exam ple units must be de rated for altitude by adjusting man ifold pressure and or changing orifice size based upon the type of fuel Natural Gas L P gas Btu content of the gas and installed altitude Altitudes over 4 000 may require a different air proving pressure switch than the one installed at the factory Check parts list for pressure switch and consult your distributor for part number and availability In Canada provincial codes may govern installation or switch Check with governing au thorities When servicing a unit installed at altitudes above 2 000 in sure that it has been properly modified to operate at that alti tude See the sections on Gas pressure Page 10 and pressure switches Page 15 to obtain specific information for you particular installation altitude CHECKING TEMPERATURE R
36. ISE Checking Temperature Rise Thermometer Return Air Temp Supply hermometer Supply Air Temp Temperature Rise Check The blower speed MUST be set to give the correct air tem perature rise through the furnace as marked on the rating plate Temperature rise is the difference between supply and return air temperatures 440 08 2011 00 To check temperature rise use the following procedure 1 Place thermometers in supply and return air registers as close to furnace as possible avoiding direct ra diant heat from heat exchangers 2 Operate furnace continuously for 15 minutes with all registers and duct dampers open 3 Take reading and compare with range specified on rating plate 4 the correct amount of temperature rise is ob tained it may be necessary to change blower speed A higher blower speed will lower the temperature rise A lower blower speed will increase the temperature rise NOTE BEFORE CHECKING TEMPERATURE RISE BE CERTAIN THAT MANIFOLD PRESSURE IS PROPERLY ADJUSTED ALLOWABLE TEMPERATURE RISE ALL MODELS Model Range 50 80 Mbtu 35 F 65 F 75 100 amp 125 Mbtu 40 F 70 F Example Supply Temp 170 Return Temp 70 Temperature Rise 100 Too High Solution Increase Blower Speed Service Manual Single Stage Multi Position Furnace ROOM THERMOSTATS Room thermostats are available from several different manufactures in a w
37. MULTI POSITION 90 SINGLE STAGE GAS FURNACES SETITE Mamun DoQ o N9MP1 N9MP2 amp 9MPD Denotes brand H C T This manual supports single stage C series and later condensing gas furnaces Manufactured by lip Part Number Products 440 08 2011 00 2 2006 2006 International Comfort Products LLC N9MP1 Indoor combustion air 1 pipe only N9MP2 Direct Vent ONLY 2 pipe only 9MPD Dual Certified Venting 1 or 2 pipes Denotes Brand T C or H Single Stage Multi Position Furnace Service Manual TABLE OF CONTENTS LeINTRODUCTION ticked pees emits eed Ed Wate Bele RC 2 2 UNIT IDENTIFICATION es gucci e eee 3 FURNACE THEORY OF OPERATION a RE CRT en x 3 4 ELECT RIGAL SUPPLY ii oe oe n dos Red ee eee a los ee RD 4 5 INTERLOCK SWITCH 22 Sie a eco ad Rc Rata MEC 5 B GAS SURREY metre es rita 5 T LP PRESSURE SWITCH 2 2 6 rd beet tin POE acce dd 10 8 HONEYWELL VR8205S GAS VALVE 11 9 HIGH ALTITUDE OPERATION x cx dear e eee Fac dal ie eR 11 10 CHECKING TEMPERATURE RISE 11 11 ROOM THERMOSTATS P Rcx ee Ca RC RD RU a 1
38. OOTING GUIDE SELF DIAGNOSTICS Self Diagnostics via an LED provided on the furnace control assist the Technician with troubleshooting If the LED is flash ing the trouble is LIKELY see below to be external to the control Certain failures of the furnace result in a specific Flash Sequence see below being displayed by the LED The LED will Flash for approximately 4 second then OFF for approximately 4 second a specific number of times indicating the problem area SELF DIAGNOSTICS In the event of a failure the LED may be seen flashing through the inspection window on the furnace blower door The Flash Sequence should be noted and recorded BEFORE removing the blower door from the furnace This will prevent the loss of a flash sequence created by an intermittent or sporadic condition Control Board Diagnostic Codes See Figure 30 OFF 24VAC or 115VAC is off fuse is open Heartbeat Normal operation or no previous Diagnostic Code ON SOLID Soft Lockout Furnace Control Error 1 hr delay If code repeats immediately following power reset then replace control 1 Flash Not used 2 Flashes Pressure switch es closed when should be open 3 Flashes Pressure switch open when should be closed 4 Flashes Limit or roll out switch open less than 2 minutes 5 Flashes Flame sensed out of sequence 6 Flashes Failure to ignite or flame sense lost while running 6 1 Flashes Soft Lockout Max trials for ignition rea
39. PLE using a 75 Mbtu furnace with an output of 67 500 Btuh 90 x 75000 and a desired temperature rise of 50 range of 40 70 F allowable and a measured ex ternal static pressure of 0 2 W C with a dry coil 67 500 or 67 500 50 X 1 08 54 1250 CFM Checking the blower performance data for this model see Table 12 indicates that 0 2 W C E S P medium high speed will deliver 1249 CFM Accordingly medium speed should be used in this example for the HEATING speed COOLING A blower speed must be selected that will provide proper air flow Nominal 400 CFM per ton for the size capacity air conditioning coil being used at the external static pressure of the Duct system installation This requires CHECKING THE EXTERNAL STATIC PRESSURE then consulting the BLOWER PERFORMANCE DATA to determine the re quired speed tap Using a manometer or magnehelic take a pressure reading on the supply and return ductwork close to the furnace The supply is positive while the return is negative To find ESP add the supply and return readings together disregarding positive negative EXAMPLE The supply measurement is found to be 0 3 W C while the return is measured at 0 2 W C The ESP would be 0 5 W C EXAMPLE A 24 000 BTU 2 TON air conditioning system using the same 75 000 BTU furnace as in the previous ex ample The external static pressure is measured and found to be 0 4 W C 400 CFM nominal per TON required
40. Pressure Open Transition Switch Pressure Close Transition Switch Pressure Open Blower Data Type amp Size Motor Amps Rpm Motor Type H p Cap Mfd Volts Filter Type amp Size Permanent not supplied Cool Cap Tons 5 W C L ML MHi amp Hi Gas Conversion Kits NattoLP NAHAOO1LP 1172958 LP to Nat _ 11729607 Order from Service Parts 440 08 2011 00 12 9 2 2 2 0 1013803 2 0 1 8 11 8 10 850 5 7 5 370 16x25x1 11 5 2 21 5 3 10 1 2 2 2 0 1013803 2 0 1 8 0021 1013515 1 0 0 8 1 7 15 11 10 8 0 1050 5 7 5 370 16x25x1 11 5 2 21 5 3 12 9 L P VR 10 0 4 55 SNAP Hot Surface 10 1 Nat 8205S 35 4 42 Integrated 30 60 100 140 180 1013812 15 1 3 1013813 11 10 10 1050 5 10 370 16x25x1 21 5 3 31 5 4 1013802 2 2 2 0 1013803 2 0 1 8 11 10 10 1050 9 1 5 10 370 16x25x1 11 2 3 31 5 14 4 1013802 2 2 2 0 1013803 2 0 1 8 0021 1013515 1 0 0 8 17 15 0031 1013165 0 7 0 6 14 12 11 10 13 900 5 40 370 16x25x1 31 5 4 41 5 5 15 0 1013166 1 3 1 1 1 8 1 6 1013157 0 9 0 7 1 7 11 10 13 900 PSCA 40 370 16x25x1 31 5 4 41 5 5 Service Manual Single Stage Multi Position Furnace TROUBLESH
41. Replace Furnace Hard wired for Continu f Control Board ous Is Y Terminal of T stat Fan Operation connected to control Yes No Go to Chart 3 Y terminal MUST be connected to enable delay Replace Furnace Control Board IF OFF delay is required NOTE Door switch must be taped closed to perform these checks Remove tape when finished NOTE A Heartbeat is defined as the diagnostics LED flashing continually from bright to dim 440 08 2011 00 Service Manual Single Stage Multi Position Furnace Troubleshooting Chart 3 Heating Cycle Continued from Chart 2 i ontinued from Cha Operation Check Place Thermostat in HEAT Is Diagnostic LED Flashing Yes Refer to Diagnostic and calling for operation a Code m Code Section No Does combustion No Is Diagnostic LED Flashing No Are 24 Volts Present Check for No Replace Fuse blower run gt a Heart Beat Across R 7 Continuity gt and Re Check Yes Yes Yes on 5 AMP Fuse Operation Check pressure switch Are 115 Volts Present Yes for Continuity at Combustion Blower Are 115 Volts Present Yes Yes on Transfo
42. SWITCH Models equipped for or converted to operate on LP Gas will be equipped with an LP Pressure Switch If so equipped Figure 8 Typical L P Pressure Switch the switch will be located in the gas supply line in a Tee fitting just ahead of the gas valve The purpose of this switch is to prevent furnace operating under low line Supply pressure conditions Operating un der low line pressure conditions can create problems such as incomplete combustion flashback sooting etc The switch is a Normally Open pressure operated switch that is wired in series with the furnace air proving pressure switch The L P Pressure Switch closes when line Supply pressure is 8 0 W C or higher the L P Pressure Switch Opens if line pressure falls below 6 0 0 6 W C inter rupting power to the gas valve 12 440 08 2011 00 Single Stage Multi Position Furnace Service Manual HONEYWELL VR8205S Gas Valve The VR8205S Gas Valve is a REDUNDANT type valve This means that it consists of two 2 valves internally with independent operators solenoids that both must be ener gized before gas can flow through the valve This redundan cy provides an added safety measure In case one of the valves sticks open Mechanically the second operator will close preventing the flow of gas If the valve does not open check for 24 Volts across the two wires to the valve during a call for heat This check MUST be made IMM
43. W dirty filter blower speed too low exces sive static in duct system etc Service Manual MODEL OLOSE 1000200 200 1251200 mr MODEL PART CLOSE ALL 1013102 MANUAL MODEL CLOSE 080 160 200 F 1000140 200 F 1002206 200 F ROLL OUT LIMIT SWITCH MODEL OLOSE ALL 1013102 MANUAL To verify this the cut out opening point of the switch should be checked using a thermocouple type thermome ter connected to the face of the switch as follows F F F F 1 Operate furnace for several minutes 2 Block return air grille s to furnace 3 Observe temperature at which switch opens burner operation ceases 4 Remove blockage from return grille s 5 Observe temperature at which switch closes burner operation resumes 6 Compare readings with the limit setting listed in the appropriate chart for the model you are servicing If switch is opening within the specified range then it is sim ply doing its job and the cause of the over temperature must be determined and corrected If however the switch is found to be opening prematurely then it should be replaced When replacing ANY limit Single Stage Multi Position Furnace switch use ONLY a switch of EXACTLY the same tempera ture setting Use of a different temperature limit switch can create a dangerous situation Some of the main limit switches used in this series are SIMILAR IN AP PEARANCE DIFFERENT TEMPERATURE SETTINGS HOWEVER ARE USED for
44. Wired Continuous Fan Operation A terminal is provided on the furnace control board located in the circulating blower compartment for operation of the continuous fan option This connection is intended for the low speed motor tap and has a lower contact rating 8 amps than the heat and cool taps When the low speed blower lead is connected to this termi nal this will provide low speed blower operation whenever the oth er two speeds Heat or Cool are not energized Thoroughly check the system after modification to ensure the proper operation of the circulating air blower in all modes of opera tion Separate speed selections for Heat Cool and Continuous Fan Connect low speed lead from circulating motor to the Cont termi nal at the furnace control The appropriate motor leads should al ready be connected to the Heat and Cool terminals Heating and Continuous Blower Speed the Same If it is necessary to operate the heating speed and continuous blower speed using the same blower speed connect a jumper be tween the Heat and Cont terminals on the furnace control Note There should be only ONE motor lead going to the Heat and Cont terminals REDUCED FURNACE LIFE HAZARD Failure to properly set the air temperature rise may result in reduced furnace life Use ONLY the following blower motor speed taps for setting air temperature rise Blower Motor Speed Taps Model Sizes Hi BLK All Med Hi O All
45. able 5 The burner orifice part nos are as follows Orifice 47 1011378 Orifice 48 1113201 Orifice 41 1096942 Orifice 42 1011351 Orifice 49 1113202 Orifice 54 1011376 Orifice 43 1011377 Orifice 44 1011352 Orifice 55 1011354 Orifice 56 1011355 Orifice 45 1011353 Orifice 46 1011744 440 08 2011 00 9 Service Manual Single Stage Multi Position Furnace Tabie4 NATURAL GAS MANIFOLD PRESSURE w c FOR 90 80 000 BTUH MODEL AND ALTERNATE INPUT MODELS MEAN ELEVATION FEET ABOVE SEA LEVEL HEATING OVES at ALTITUDE 2000 3000 4000 5000 6000 7000 8000 BTU CU FT omas Manifold Manifold Manifold No Pressure EEE Pressure No Pressure No Pressure No Pressure e E Em EE No E oi NUM MEME 1 ae E FEE o ES 81 ELS 1050 EREE ERTA EENM Bee NOTE Natural gas data is based on 0 60 E gravity For fuels with different pum gravity consult the National Fuel Gas Code ANSI Z223 1 2002 NFPA 54 2002 or National Standard of Canada Natural Gas And Propane Installation Code CSA B149 1 05 Bold indicated the factory shipped orifice size 44 LPG or PROPANE GAS MANIFOLD PRESSURE w c FOR THE 80 000 BTUH MODEL AND ALTERNATE INPUT MODELS HEATING VALUE MEAN ELEVATION FEET ABOVE SEA LEVEL BTU CU FT 2000 3000 a 5000 6000 7000 8000 tcp ope s s hmmm NOTE Propane data is based on 1 53 E gravity For fuels with different specific gravity consult the Nati
46. aces 25 amp 3 90 elbows with 2 PVC pipe or 40 amp 5 90 elbows with 2 PVC pipe amp Long Vent Kit See Tech Manual or 70 amp 5 90 elbows with 3 PVC pipe 100 000 Btuh Furnace 40 amp 5 90 elbows with 3 PVC pipe or 70 amp 5 90 elbows with 3 PVC pipe amp Long Vent Kit See Tech Manual 125 000 Btuh Furnace 40 amp 5 90 elbows with 3 PVC pipe Elbows are DWV Long Radius Type for 2 and 3 vents If more than five elbows are required reduce the length of both the inlet and exhaust pipes 5 for each additional elbow used NOTE It is allowable to use larger diameter pipe and fitting than shown in the tables but not smaller diameters than shown Service Manual Single Stage Multi Position Furnace Direct Vent Termination Clearance 7 V UIR PL V 25 24 65 2 VENT TERMINAL ESS AREA WHERE TERMINAL IS NOT PERMITED Clearance Description Canadian Installation 1 U S Installation 2 A Clearance above grade veranda porch deck balcony or 12 30cm 12 30 cm anticipated snow level Clearance to a window or door that may be opened 6 15 cm for appliances lt 10 000 BTUH 3kW 12 30 6 15 cm for appliances lt 10 000 BTUH 3kW 9 23 cm cm for appliances gt 10 000 Btuh 3 kW and lt 100 000 Btuh for appliances gt 10 000 Btuh 3 kW and lt 50 00
47. arts Sizing Combustion Air and Vent Pipe Consult Table 9 or Table 10 to select the proper diameter exhaust and combustion air piping Exhaust and combus tion air piping is sized for each furnace Btuh size based on total lineal vent length on inlet or outlet side and number of 90 elbows required Two 45 elbows can be substituted for one 90 elbow The elbow or elbows used for vent ter mination outside the structure ARE counted including el bows needed to bring termination above expected snow levels The elbow inside the furnace on the 9MPD IS NOT included in the count Pipe Diameter Table Table 9 N9MP1 amp 9MPD Models 50 000 75 000 amp 80 000 Btuh Furnaces 40 amp 5 90 elbows with 2 PVC pipe or 70 amp 5 90 elbows with 3 PVC pipe 100 000 Btuh Furnace 40 amp 5 90 elbows with 3 PVC pipe or 70 amp 5 90 elbows with 3 PVC pipe amp Long Vent Kit See Tech Manual 125 000 Btuh Furnace 40 amp 5 90 elbows with 3 PVC pipe If more than five elbows are required reduce the length of both the inlet and exhaust pipes 5 for each additional elbow used NOTE It is allowable to use larger diameter pipe and fitting than shown in the tables but not smaller diameters than shown 440 08 2011 00 Pipe Diameter Table Tabang N9MP2 Models 50 000 amp 80 000 Btuh Furnaces 40 amp 5 90 elbows with 2 PVC pipe or 70 amp 5 90 elbows with 3 PVC pipe 75 000 Btuh Furn
48. ched 3hr delay 7 Flashes Soft Lockout Limit or roll out switch open longer than 2 minutes 1 hr delay roll out switch requires manual reset 8 Flashes Permanent Lockout Gas valve relay contact stuck closed or miswired gas valve power reset only 10 Flashes Line voltage 115VAC polarity reversed If twinned refer to twinning kit instructions f status code recall is needed briefly 2 3 seconds remove then reconnect one limit switch wire main or rollout to display last stored status code Code is automatically cleared after 72 hours or upon power reset Proper flame sense microamps 0 7 microamps D C minimum 2 0 4 0 microamps nominal gniter should measure between 40 70 OHMS at room temperature As a matter of standard practice Line Voltage POLARITY and GROUNDING see Page 4 should be verified on ANY unit indicating system lockout NOTE The Problems listed for the Flash Sequence Indications above are NOT ABSOLUTES They are generalities intended to steer the Technician in the right direction Used with common sense and other established troubleshooting methods however should result in an accurate diagnosis of the problem NOTE The flash code will be lost if the 115 VAC power is removed from the furnace 440 08 2011 00 Single Stage Multi Position Furnace Service Manual Diagnostic Code Section NOT USED ON SINGLE STAGE 10 Check for correct line vo
49. com bustion blower Higher Greater Negative Pressures Higher than normal negative pressures measured at the Combustion Blower may be caused by 1 Restriction on the Inlet side of the combustion blower Plugged Heat Exchanger air inlet orifice too small Typical Upflow Installation Aluminum or non rusting shield recommended See Vent Termination Shielding for dimensions Coupling on ends of exhaust pipe Total pipe amp coupling out side structure 8 8 Min gt Inlet Pipe not lt 20 Max same used Single 3 l amp pj atmospheric 2 Pipe model zone E gu 8 Min 20 in ae atmospheric zon Vent Pipes MUST be supported Horizontally and Vertically DISCHARGE AIR Increase minimum from 8 to 18 for cold climates sustained temperatures below 0 F 25 23 33 Game Typical Downflow Installation See Vent Termination Shielding in Vent Sec tion gt Min 20 same atmospheric zone Coupling on inside and outside of wall to restrain vent pipe Inlet Pipe not used on Single Pipe gt model 8 Min
50. conform to temperature limitation of 63 F 35 C rise and be sized for the unit maximum amps stated on the rating plate Add the full load amps for potential field installed accessories that would receive power from the furnace control Consult NEC or local codes for proper wire and circuit sizing SUPPLY VOLTAGE Supply voltage to the furnace should be a nominal 115 volts It MUST be between 104 volts and 127 volts Supply volt age to the furnace should be checked WITH THE FUR NACE IN OPERATION Voltage readings outside the speci fied range can be expected to cause operating problems Their cause MUST be investigated and corrected ELECTRICAL GROUND Proper grounding of the electrical supply to THE FURNACE IS REQUIRED for safety and operational reasons POLARITY CORRECT POLARITY of the line voltage supply to the fur nace is also required for safety and operational reasons The furnace control MUST have proper line voltage polarity to operate properly Electrical Connections NOTE Junction Box can be mounted to either the left or right side 5 Models may 10 2 pressure switches Low Voltage Terminal Board NOTE 115 VAC 60Hz single phase Operating voltage range 127 VAC max 104 VAC min Permissible limits of voltage at which unit will operate satisfactorily CHECKING GROUNDING AND POLARITY
51. essure Open WC Transition Switch Pressure Close WC Transition Switch Pressure Open High Altitude Pressure Sw Part No Blower Switch Pressure Close Blower Switch Pressure Open Transition Switch Pressure Close Transition Switch Pressure Open Long Vent Kit Part No Pressure Switch Part No Blower Switch Pressure Close Blower Switch Pressure Open Transition Switch Pressure Close WC Transition Switch Pressure Open WC High Altitude Long Vent Kit Part No Pressure Switch Part No Blower Switch Pressure Close Blower Switch Pressure Open Transition Switch Pressure Close Transition Switch Pressure Open Blower Data Type amp Size Motor Amps Rpm Motor Type H p Cap Mfd Volts Filter Type amp Size Permanent not supplied Cool Cap Tons 5 W C 1 ML MHi amp Hi Gas Conversion Kits Nat to LP 11729587 LP to Nat 1172960 Order from Service Parts 440 08 2011 00 12 9 1013802 2 2 2 0 1013803 2 0 11 8 10 850 1 5 7 51370 16x25x1 11 5 2 21 5 3 10 1 1013802 22 2 0 1013803 2 0 1 8 0011 1013518 1 0 0 8 2 0 1 8 11 8 8 0 1050 1 5 7 5 370 16x25x1 11 5 2 21 5 3 12 9 10 1 Integrated 30 60 100 140 180 1013811 1 8 1 6 11 10 10 1050 1 5 1
52. for ignition period the control Obstructed pressure tube will repeat the ignition sequence 3 more times Pressure switch stuck closed before a lockout 6 1 occurs If flame signal is lost during the blower on delay period blower 3 PRESSURE SWITCH DID NOT CLOSE blower will come on for the selected blower off OR REOPENED If open longer than 5 minutes delay Check the following items first before inducer shuts off for 15 minutes before retry If proceeding to the next step opens during blower on delay period blower will Gas value turned ON come on for the selected blower off delay Open Check for Green Yellow wire MUST be connected vent sizing to furnace sheet metal Low inducer voltage 115V Flame sensor must not be grounded Inadequate combustion air supply To determine whether the problem is in Disconnected or obstructed pressure tubing the gas valve igniter or flame sensor Defective inducer motor LP Low pressure gas switch open 6 1 Defective pressure switch IGNITION LOCKOUT System failed to ignite gas Excessive wind and prove flame in 4 attempts Control will Restricted vent auto reset after 3 hours See status code 6 7 LIMIT CIRCUIT LOCKOUT Lockout occurs if the limit flame rollout is open longer than 2 minutes Control will auto reset after 1 hour See code 4 8 GAS HEATING LOCKOUT Turn off power and LP low pressure gas switch used in LP kit 440 08 2011 00 wai
53. he FCB continues flashing error code 6 The igniter stays off for 17 seconds then begins to warm up again The igniter glows red hot for 22 seconds then turns off The FCB proceeds to soft lockout and stops flashing error code 6 and begins flashing error code 6 1 The inducer motor de energizes after a 15 second post purge Control Board Diagnostic Codes See Figure 30 OFF 24VAC or 115VAC is off fuse is open Heartbeat Normal operation or no previous Diagnostic Code ON SOLID Soft Lockout Furnace Control Error 1 hr delay If code repeats immediately following power reset then replace control 1 Flash Not used 2 Flashes Pressure switch es closed when should be open 3 Flashes Pressure switch open when should be closed 4 Flashes Limit or roll out switch open less than 2 minutes 5 Flashes Flame sensed out of sequence 6 Flashes Failure to ignite or flame sense lost while running 6 1 Flashes Soft Lockout Max trials for ignition reached 3hr delay 7 Flashes Soft Lockout Limit or roll out switch open longer than 2 minutes 1 hr delay roll out switch requires manual reset 8 Flashes Permanent Lockout Gas valve relay contact stuck closed miswired gas valve power reset only 10 Flashes Line voltage 115VAC polarity reversed If twinned refer to twinning kit instructions f status code recall is needed briefly 2 3 seconds remove then reconnect one limit switch wire main or rollout to dis
54. ices MUST be done by a qualified service technician See section on changing orifices CAUTION See unit instructions to determine if model may be converted to alternate input MANIFOLD PRESSURE AND ORIFICE SIZE FOR HIGH ALTITUDE APPLICATIONS EXCEPT FOR THE 90 80 000 BTUH MODEL AND ALTERNATE INPUT RATINGS HEATING VALUE MEAN ELEVATION FEET ABOVE SEA LEVEL at ALTITUDE 010 2001 to 3001 to 4001 to 5001 to 6001 to 7001 to ___ ___ m m ss e FOR THE 90 80 000 BTUH MODEL AND ALTERNATE INPUT RATINGS HEATING VALUE MEAN ELEVATION FEET ABOVE SEA LEVEL at ALTITUDE 0 to 2001 to 3001 to 4001 to 5001 to 6001 to BTU CU FT 2000 3000 4000 5000 6000 7000 8000 ss s l NOTE Propane data is based on 1 53 specific gravity For fuels with different specific gravity consult the National Fuel Gas Code ANSI Z223 1 2002 NFPA 54 2002 or National Standard Of Canada Natural Gas And Propane Installation Code CSA B149 1 05 NOTE In the USA for furnaces fired on standard rate the input rating for altitudes above 2000 5 000 for 80 000 BTUH and alternate input must be derated by 496 for each 1000 above sea level see Table 3 and Table 5 In Canada the input rating for altitudes above 2000 5 000 for 80 000 BTUH must be reduced by 10 for altitudes of 2000 to 4500 above sea level Use the 2001 to 3000 column in Table 3 and Table 5 L P PRESSURE
55. ide variety of styles They range from the very simple and inexpensive Bi metallic type to the complex and costly electronic set back type They are sim ply a switch or series of switches designed to turn equip ment or components ON or OFF at the desired condi tions An improperly operating or poorly located room thermostat can be the source of perceived equipment problems A careful check of the thermostat and wiring must be made then to insure that it is not the source of problems Fouero Thermostat Location THERMOSTAT SHIELD LOCATION The thermostat should not be mounted where it may be af fected by drafts discharge air from registers hot or cold or heat radiated from the sun or appliances Never install in alcoves bathrooms or bedrooms The thermostat should be located about 5 ft above the floor in an area of average temperature with good air circulation Normally an area in close proximity to the return air grille is the best choice Mercury bulb type thermostats MUST be level to control temperature accurately to the desired set point Electronic digital type thermostats SHOULD be level for aesthetics HEAT ANTICIPATORS Heat anticipators are small resistance heaters built into most electric mechanical thermostats Their purpose is to prevent wide swings in room temperature during furnace operation In order to accomplish this the heat output from the antici pator must be
56. io En he e mh hx o ERE Kiet Poe e hte tra 34 DIAGNOSTIC SECTION 22 su eux acces ly cae alana cura trece 35 TROUBLE SHOOTING CHART 1 55 ta kites Baw head E aan 36 TROUBLE SHOOTING CHART 82 weg iar dre Us be bee ek EX ERI RE 37 TROUBLE SHOOTING CHART vex See on E xit Rent wend 38 INDEX EDT 40 INTRODUCTION This service manual is designed to be used in conjunction with the installation manual and or technical support manu al provided with each furnace These furnaces represent the very latest in high efficiency gas furnace technology Consequently they incorporate the use of certain controls that contain highly sophisticated electronic components which are not user serviceable Therefore it is essential that only competent qualified ser This service manual covers the following models QMPD or later 9MP1 later and 9MP2 or later models The overall operation of all of these models is essentially the same This manual therefore will deal with all subjects in a gener al nature I E all text will pertain to all models unless that subject is unique to a particular model or family in which case it will be so indicated vice personnel attempt to install service or maintain this product This Service manual was written to assist the professional HVAC service technician to q
57. l 3 If the same speed must be used for both heating and cool ing remove the undesired motor speed lead from the Heat or Cool terminal and connect that lead to the open terminal at Unused Motor Lead location Attach a jumper between the Heat and Cool terminals and the remaining motor speed lead Note For motors with 4 speed leads it will be necessary to tape off the terminal of the motor speed lead removed from the Heat or Cool terminal with electrical tape since an open terminal will not be available at the Unused Motor Lead location M1 amp M2 TERMINALS There are two 2 terminals marked M1 and M2 on the Furnace Control Board which have no internal connection to the control Their purpose is to provide a place to connect any UNUSED speed tap wires to keep them out of the way and prevent them from shorting out against the furnace cas ing or each other Service Manual Single Stage Multi Position Furnace Continuous Fan Operation using G Energizing the terminal on the furnace control provides contin uous fan operation This is done by connecting the G terminal of the thermostat to the G terminal on the furnace control When the FAN switch is turned from auto to ON the fan will operate continu ously at HEAT speed EAC will be energized in this mode NOTE In heating the fan will turn off during furnace ignition and warm up then restart at heating speed Hard
58. ls use an induced draft exhaust combustion blow er mounted on the outlet side of the secondary heat ex changer The purpose of the combustion blower is to estab lish a draft flow through the heat exchangers to insure Vent Pipe that all flue products are carried outside the structure via the Rubber Coupling P Top Panel EXI vent pipe The blower is made of plastic and is driven by a amp Clamps _ uyus permanent split capacitor motor Figure 29 shows the method of connection the vent pipe to PVC Vent Extension Pipe the exhaust blower Vent Fitting amp Clamps Combustion Blower Vent Extension Pipe Side Panel Exit SIDE VIEW 25 23 35 NOTE Built in channel will be angled 5 to 10 also 440 08 2011 00 Single Stage Multi Position Furnace Service Manual CONDENSATE DRAIN TRAP This furnace removes both sensible and latent heat from the products of combustion Removal of the latent heat re sults in condensation of the water vapor The condensate is removed from the furnace through the drains in the plastic transition and the vent fitting The drains connect to the in ternally mounted condensate drain trap The startup of a new furnace will involve a cycle or two of the furnace to properly prime the condensate trap with water Until the trap is fully primed some condensate will be pulled into the combustion blower The furnace may cycle on the pressure switch connected to the
59. ltage polarity If units are twinned Check for proper low voltage 24V transformer phasing Heartbeat 4 LIMIT CIRCUIT FAULT Indicates the limit flame NO PREVIOUS CODE Stored codes are erased rollout switch is open Blower and inducer will run after 72 hours Run system through a heating or until open switch remakes If open longer than cooling cycle to check system 2 minutes code changes to lockout 7 If open less than 2 min status code 4 continues to flash LED OFF until blower shuts off Flame rollout switch requires No power manual reset Check for Check 5A furnace control fuse Dirty filter or restricted duct system Check circuit breaker or fuse Loose blower wheel Check door switch Defective blower motor or capacitor Check 115V and 24V wiring Inadequate combustion air supply flame rollout switch open ON Solid Restricted vent CONTROL CIRCUIT LOCKOUT Auto vent sizing reset after 1 hour lockout due to Excessive wind Flame circuit failure Gas valve relay stuck open 5 FLAME PROVING SIGNAL Software check error Flame is proved while gas valve is de energized Reset power to clear lockout Replace Inducer will run until fault is cleared Check for control if code repeats Stuck open or leaky gas valve 2 PRESSURE SWITCH DID NOT OPEN 6 IGNITION PROVING FAILURE If flame is not Check for sensed during the trail
60. o another Check with the thermostat manufacturer to find out the proper way of adjusting the cycle rate CONTROL WIRING Control wiring is an important part of the total equipment installation since it provides the vital communications link between the thermostat and the equipment Control wiring that is either too long undersized or improperly connected be it simply loose or on the wrong terminal can in fact be the source of many equipment problems 440 08 2011 00 Single Stage Multi Position Furnace Service Manual ALWAYS check to make sure that the control wiring is con nected to the proper terminal s of the equipment and ther mostat you are using Remember also that the thermostat terminals are not always identified alike by different thermo stat manufacturers Connections MUST be clean and tight to insure trouble free operation ELECTRONIC CONTROLS used on this series of furnace RESPOND DIFFERENTLY to certain control wiring practic es which have been generally accepted in the HVAC indus try for many years For Example For years installers have run a wire from the Y terminal of the room thermostat and connected it direct ly to the contact on coil of a condensing unit not making any connection to the furnace with this wiring Then run the low voltage wire from the condensing unit back to the C terminal of the furnace With the electronic Furnace Control Board used in this
61. o be remembered that when a limit switch opens it more than likely is not due to a bad switch The cause of the opening limit must be found and corrected be fore the furnace can resume proper operation WARNING FIRE HAZARD Failure to do so can result in death personal injury and or property damage Limit controls are factory preset and MUST NOT be adjusted Use ONLY manufacturer s authorized replacement parts 440 08 2011 00 The specific functions of the two 2 limit switches used in this series of furnaces are as follows MAIN LIMIT SWITCH There is a Normally Closed switch located on the front partition of the furnace It monitors supply air temperature and interrupts furnace burner operation when a supply air temperature is sensed which would result in the furnace ex ceeding Maximum allowable outlet air temperature While the main limit is open the combustion blower and the circu lating blower will be energized continuously This control is an Automatic reset control which will reset itself when the temperature sensed drops to a safe level If furnace burner cycles on this limit switch I E switch opens and closes during furnace operation it is more than likely due to a high temperature rise through the furnace See checking temperature on page 10 of this manual High temperature rise can be caused by either OVER FIRING high manifold pressure incorrect orifices etc or LOW AIR FLO
62. ol Type Furnace Control Timed secs Combustion Flue Outlet Size Inches Std Outlet Temp 5 No Elbows Blower Pressure 5 No Elbows WC Blower Pressure 40 5 90 DWV Elbows WC Transition Bx Pressure 5 No Elbows WC Transition Bx Pressure 40 5 90 DWV Elbows WC Limits amp Controls Rollout Switch Limit Control Setting F Standard Pressure Sw Part No Blower Switch Pressure Close Blower Switch Pressure Open Transition Switch Pressure Close Transition Switch Pressure Open High Altitude Pressure Sw Part No Blower Switch Pressure Close Blower Switch Pressure Open Transition Switch Pressure Close Transition Switch Pressure Open Long Vent Kit Part No Pressure Switch Part No Blower Switch Pressure Close W Blower Switch Pressure Open Transition Switch Pressure Close WC Transition Switch Pressure Open WC High Altitude Long Vent Kit Part No Pressure Switch Part No Blower Switch Pressure Close Blower Switch Pressure Open Transition Switch Pressure Close Transition Switch Pressure Open Blower Data Type amp Size Motor Amps Rpm Motor Type H p Cap Mfd Volts Filter Type amp Size Permanent not supplied Cool Cap Tons 5 W C L ML MHi amp Hi Gas Conversion Kits Natto LP NAHAOO1LP 1172958 LP to Nat 001 0 1172960 Order from Service Parts 12 9
63. onal Fuel Gas Code ANSI Z223 1 2002 NFPA 54 2002 or National Standard Of Canada Natural Gas And Propane Installation Code CSA 149 1 05 pulum HE Lu 735 Eca E EEA NOTE The derating of these furnaces at 2 Natural Gas and 4 Propane Gas has been tested and design certified by CSA In Canada the input rating must be derated 5 Natural Gas and 10 Propane Gas for altitudes of 2 000 to 4 500 above sea level Use the 2001 to 3000 column in Table 2 Table 3 Table 4 and Table 5 General Derating Rules as per Table 3 Orifices can be ordered through your distributor See Figure 6 1 These furnaces may be used at full input rating when installed at altitudes up to 2 000 When installed High Altitude Input Rate above 2 000 the input must be decreased 2 natu Nameplate Sea Level Input Rate x Multiplier ral or 4 LP for each 1000 above sea level in the High Altitude USA In Canada the input rating must be derated 5 High Altitude ili High Altitude Multiplier Multiplier Multiplier natural or 1096 LP for each 1000 above sea level Elevation LP Gas LP que See Table 4 or Table 5 for required high altitude in Standard Input BTUH Input Alternate Input put rate 2 For operation with natural gas at altitudes above 2 000 orifice change and or manifold pressure ad 3007 4000 justments may be required for the gas supplied First consult your local gas
64. plastic transition box due to condensate buildup After the trap is primed the conden sate will start draining from the furnace The combustion blower will clear out any remaining condensate in the blow er housing through the vent fitting downstream of the blow er Note that the condensate trap can also be primed by pouring water into the 1 2 drain hose Remove the s ID drain hose from either the gutter or the white PVC Tee Trap Using a funnel pour eight 8 ounces of water into 1 2 ID drain hose Water will flow through the drain hose and into the condensate drain trap This will prime both the vent and the transition sides of the trap Reconnect the 1 2 ID drain hose to the original component either the gutter or the PVC Tee Trap The condensate drain trap supplied with the furnace MUST be used The drain connection on the condensate drain trap is sized for 3 4 PVC or CPVC pipe however alternate 1 2 CPVC nominal 5 8 O D or vinyl tubing with a minimum in ner diameter 0 of 5 3 may also be used as allowed by local codes Alternate drain pipes and hoses may be used as allowed by local codes The drain line must maintain a 1 4 per foot downward slope toward the drain 1 4 per foot is recommended Installation of an overflow line is recommended when the 1 4 per foot slope to the condensate drain cannot be maintained DO NOT trap the drain line in any other location than at the condensate drain trap su
65. play last stored status code Do not remove power or blower door before initiating status code recall or code will be lost Code is automatically cleared after 72 hours or upon power reset Proper flame sense microamps 0 7 microamps D C minimum 2 0 4 0 microamps nominal Figure 30 Furnace Control Board 24 VAC HUM 3 gt Diagnostic Light 115 VAC HUM 440 08 2011 00 CHECKING FLAME CURRENT Figures Checking Flame Sensor Wire From Flame Sensor Wire From Flame Sensor Terminal of Ignition Control 2 0 AC Volt Ohms DI 5 DC Volts Amp Common Amps The ignition system used this furnace series prove verify flame via the Flame Rectification method Flame Rectification is a process of converting Alternating Current A C into Direct Current D C During the ignition sequence an alternating current A C Voltage is applied to the Flame sensor When the burner lights the flame conducts an electrical current between the flame sensor and the burner ground Due to the difference in size between the flame sensor and the burner ground area this current flows mostly in one di rection This creates a pulsating Direct Current that flows back to the ignition control proving flame This flame current D C Microamps may be checked while flame is present using a D C Microampmeter IN SE RIES see Figure 31 with the flame sensor circuit Flame curren
66. ppliance s direct vent intake or exhaust Clearance from a plumbing vent stack 3 91 cm 3 91 cm Clearance above a paved sidewalk or paved driveway located 7 2 13 m 7 2 13 m on public property 1 In accordance with the current CSA B149 1 Natural Gas and Propane Installation Code 2 In accordance with the current ANSI 2223 1 54 National Fuel Gas Code 18 46 cm above roof surface Permitted only if veranda porch deck or balcony is fully open on a minimum of two sides beneath the floor For clearances not specified in ANSI 2223 1 54 or CSA B149 1 clearances shall be in accordance with local installation codes and the requirements of the gas supplier and the manufacture s installation instructions vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings Notes 1 The vent for this appliance shall not terminate a Over public walkways or b Near soffit vents or crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or property damage or c Where condensate vapor could cause damage or could be detrimental to the operation of regulators relief valves or other equipment When locating vent terminations consideration must be given to prevailing winds location and other conditions which may cause recirculation of the combustion products of adjacent vents
67. pplied with the furnace 440 08 2011 00 CAUTION FROZEN AND BURST WATER PIPE HAZARD Failure to do so may result in burst water pipes serious property damage If a condensate pump is installed a plugged condensate drain or a failed pump may cause the furnace to shut down Do not leave the home unattended during freezing weather without turning off water supply and draining water pipes or otherwise protecting against the risk of frozen pipes If possible DO NOT route the drain line where it may freeze The drain line must terminate at an inside drain to prevent freezing of the condensate and possible property damage 1 Acondensate sump pump MUST be used if required by local codes or if no indoor floor drain is available The condensate pump must be approved for use with acidic condensate 2 A plugged condensate drain line or a failed conden sate pump will allow condensate to spill If the furnace is installed where a condensate spill could cause damage it is recommended that an auxiliary safety switch be installed to prevent operation of the equip ment in the event of pump failure or plugged drain line If used an auxiliary safety switch should be installed in the R circuit low voltage ONLY 3 If the auxiliary switch in the condensate pump is used the furnace may shut down due to a blocked conden sate line or failed pump To prevent frozen water pipes see the Frozen Water Pipe Hazard section on Page 4
68. rcoaire N Non Brand Specific Generic Brand Identifier 8 Non Condensing 80 Gas Furnace 9 Condensing 90496 Gas Furnace Installation Configuration UP Upflow HZ Horizontal DN Downflow UH Upflow Horizontal DH Downflow Horizontal MP Multiposition Upflow Downflow Horizontal Major Design Feature 1 One Single Pipe N Single Stage P PVC Vent T Two Stage V Variable Speed 2 Two Pipe D 1 or 2 Pipe L Low NOx 1 Engineering Rev Denotes major changes Marketing Digit Denotes major change Cooling Airflow 08 800 CFM 12 1200 CFM 14 1400 CFM 16 1600 20 2000 Cabinet Width B 15 5 Wide F 19 1 Wide J 22 8 Wide L 24 5 Wide Input Nominal MBTUH FURNACE THEORY OF OPERATION The high efficiencies and lower profile Compared to past series of this furnace have been obtained using design techniques not typical of traditional furnace designs A brief description of these new design techniques and the pur pose they serve follows 1 Reducing the height of the furnace while maintaining the high efficiency of pervious models required main taining the surface area of the heat exchanger and yet minimizing the overall size The design required to achieve these results is the SER design wherein the flue gasses must follow a serpent shaped passage through the heat exchanger
69. rmer Primary Yes Replace Pressure Switch Replace Combustion Replace Transformer Blower Does the igniter warm up Are 115 Volts present Is LED Flashing 3 Times Replace Furnace and glow red across igniter terminals No No Control Board Yes Yes Yes Check Igniter for Continuity Combustion blower creating Check vent flue for sufficient draft pressure problems No ses Yes Yes restriction etc Replace pressure switch and re check operation Does burner ignite Are 24 Volts present across Check Wiring for Repair or Replace Gas Valve terminals Continuity edi Wiring Yes Yes Is adequate gas supply available at gas valve Yes Correct gas supply problems No and re check operation Replace gas valve Yes Does burner remain lit and No Is LED flashing a Diagnostic Burner remains lit but igniter go OFF Code No igniter also stays Yes Yes Check flame sensor flame current amp line voltage polarity amp ground wire on manifold Replace Furnace Control Board NOTE Door switch must be taped closed to perform these checks Remove tape when finished NOTE A Heartbeat is defined as the diagnostics LED flashing continually from bright to dim 440 08 2011 00 Service Manual Single Stage Multi Position Furnace Troubleshooting Chart 3 Continued from Page 38
70. se ries however the Y terminal of the furnace does in fact Serve a particular purpose Failure to connect it will result in certain improper operation as follows The COOLING fan speed is energized via the Y terminal Failure to connect the thermostat Y terminal to the Y terminal on the control will result in the failure to energize the COOLING speed on a call for cooling from the thermo stat The HEATING speed will be energized instead via the G terminal TWINNING KITS Some installations may require a Heating capacity or Air flow capabilities greater than a single furnace of this series can provide When this is necessary furnaces may be installed in a Twinned configuration The Twinning Kit allows the two 2 identical furnaces to be controlled by the same room thermostat When Twinned the circulating conditioned air blowers of BOTH furnaces will operate simultaneously The kit part no for the C se ries or later furnace is NAHA004WK LIMIT SWITCHES Two 2 different kinds of limit switches are used on this se ries of furnaces They are the main limit and roll out limit switch The main limit and roll limit switches are used on ALL models NOTE AII limit switches are safety devices and other than for testing purposes should never be jumped out Limit switches are normally closed electrical switches de signed to open when their predetermined limit setting has been reached It should als
71. supplier then refer to Table 2 for required pressure change and or orifice change for high altitudes 3 For operation with LP gas gas orifices MUST be changed and manifold pressure MUST be maintained Based on mid range of elevation 440 08 2011 00 Service Manual Single Stage Multi Position Furnace High Altitude Input Rate Nameplate Sea Level Input Rate x Multiplier High Altitude Multiplier Elevation Natural Gas Standard Input 0 2000 High Altitude Multiplier Natural Gas 80 000 BTUH Input High Altitude Multiplier Natural Gas Alternate Input 7001 8000 Based on mid range of elevation 4 n cases where Table 2 or Table 3 is not applicable eg alternate input rate application refer to Table 4 or Table 5 for required high altitude input rate Main Burner Flame Check Allow the furnace to run approximately 10 minutes Then inspect the main burner flames See Figure 5 Check for the following e Stable and blue flames Dust may cause orange tips or wisps of yellow but flames MUST NOT have solid yellow tips e Flames extending directly from burner into heat ex changer e Flames do NOT touch sides of heat exchanger If any problems with main burner flames are noted it may be necessary to adjust gas pressures or check for drafts Burner Face 10 10 78 Changing Orifices for High Altitude A WARNING ELECTRICAL SHOCK FIRE OR EXPLOSION HAZARD Failure
72. t 5 minutes to retry Check for Stuck closed gas valve relay on control Miswire or short to gas valve wire Service Manual Single Stage Multi Position Furnace Troubleshooting Chart 1 Start Continuous Fan Thermostat in OFF Operation Check position Heartbeat on 5 Diagnostic LED Diagnostic LED Flashing a Code Yes Go to Diagnostics Code Place Thermostat fan Section switch in position Does indoor blower run on Is there a Heartbeat on Heat speed No the Diagnostic LED No Yes Yes Are 115 Volts present across __ Check supply transformer primary terminals No Circuit Yes Check Transformer and wiring to control and 5A Fuse on Furnace Control Board Are 24 Volts present across Replace Furnace Control Board R and terminals No control and re check operation Yes Are 24 Volts present across Check Thermostat and and G terminals No gt thermostat wiring Yes Are 115 Volts present across Replace Furnace Control HEAT Fan and Neutral Terminals No gt Board Yes Return Thermostat fan Check blower Motor switch to AUTO position capacitor and wiring Go to Chart 2 NOTE Door switch must be taped closed to perform
73. t should be a minimum of 0 7 D C Lower than normal readings will not keep flame established and may be due to flame not properly enveloping sensor dirty sensor low gas pressure or pilot flame etc The normal current for the flame sensor of this series fur nace should be nominal value of 2 0 4 0 uA D C CAPACITORS Capacitors are used for the circulating conditioned air blower motor Before replacing this motor assumed to be bad the condition of its capacitor should be verified since it and not the motor may be the source of the problem Before checking any capacitor the supply power to the unit should be turned OFF The capacitor should then be dis charged before testing This can be done by shorting the ca pacitor leads together The condition of the capacitor should then be verified with a capacitor analyzer one that indicated the capacitor s val ue in microfarads rather than with an Ohmmeter The rea son this is that an Ohmmeter test can only indicate if a capacitor is OPEN or SHORTED it cannot verify if its value microfarads is within an acceptable range Capacitor should test to within 10 of its rated value Ca pacitors testing outside this range should be replaced A weak capacitor can be the cause of a motor failing to start Figure a Checking Capacitor Microfarads BLOWER ASSEMBLY All models use a multi speed permanent split capacitor motor
74. the same regardless of the current flowing through it Consequently most thermostats have an adjust ment to compensate for varying current draw in the thermo stat circuit The proper setting of heat anticipators then is important to insure proper temperature control and customer satisfac tion Figures Measuring Current Draw 8 Subbase Ammeter The best method to obtain the required setting for the heat anticipator is to measure the actual current draw in the con trol circuit W using low range 0 2 0 Amps Ammeter See Figure 11 After measuring the current draw simply set the heat anticipator to match that value If a low range ammeter is not available a type meter may be used as follows 1 Wrap EXACTLY ten 10 turns of wire around the jaws of a type ammeter 2 Connect one end of the wire to the W terminal of the thermostat sub base and the other to the R termi nal 3 Turn power on and wait approximately 1 minute then read meter 4 Divide meter reading by 10 to obtain correct anticipa tor setting Electronic thermostats do not use a resistance type antici pator These thermostats use a microprocessor computer that determines a cycle rate based on a program loaded into it at the factory These cycle rates are normally field adjustable for different types to equipment The method of adjustment however varies from one thermostat manufacturer t
75. type switch This switch senses the negative pressure created by at the combus tion blower Under normal operating conditions sufficient pressure is developed by the exhaust combustion blower to close the 440 08 2011 00 Single Stage Multi Position Furnace Service Manual switch and permit the burner to operate As the condensate drain begins to back up however the pressure begins to reduce When the pressure drops sufficiently burner opera tion will be prevented until the condition is corrected MODEL CLOSE W C EE 1960200 22 1251206 18 MODEL OPEN W C CLOSE W C 125206 EE MODEL PART OPEN W C CLOSE W C 050B12C 075F12C 080F16C 100F14C 100J20C 125L20C N9MP1 HIGH ALTITUDE INDUCER SWITCH MODEL PART OPEN W C CLOSE W C 5200 101887 or 08 Pressure Switch Pressure Port 100F14C E 2 2 2 Normally Open ae Terminal M Common Terminal 440 08 2011 00 N9MP2 STANDARD TRANSITION SWITCH MODEL PART OPEN W C CLOSE W C 050B12C 1013802 2 1007200 22 1251200 N9MP2 STANDARD INDUCER SWITCH MODEL OPEN W C CLOSE W C 1251200 EE N9MP2 HIGH ALTITUDE TRANSITION SWITCH MODEL PART OPEN W C CLOSE W C 2508120 OrSFTaC OBOFTGC 1007200 N9MP2 HIGH ALTITUDE INDUCER SWITCH MODEL PART OPEN CLOSE W C 25200 T0187
76. uickly and accurately diag nose and repair any malfunction of this product It will be necessary then for you to accurately identify the unit you are servicing so you may be certain of a proper diagnosis and repair See Unit Identification Page 3 SAFETY REQUIREMENTS Recognize safety information This is the safety alert symbol the potential for personal injury When you see this symbol on the furnace and in instructions manuals be alert to Understand the signal words DANGER WARNING or CAUTION These words are used with the safety alert symbol DANGER identifies the most serious hazards those that will result in severe personal injury or death WARNING signifies a hazard that could result in personal injury or death CAUTION is used to identify unsafe practices that could result in minor personal injury or product and property damage NOTE is used to highlight suggestions that will result in enhanced installation reliability or operation Installing and servicing heating equipment can be hazardous due to gas and electrical components Only trained and qualified personnel should install repair or service heating equipment Untrained service personnel can perform basic maintenance functions such as cleaning and replacing air filters All other operations must be per formed by trained service personnel When working on heating equipment observe precautions in the literature on tags and on labels attached to or shipped with the unit
77. ult in the switch failing to close or failing to remain closed during furnace operation When servicing a unit whose pressure switch will not close or remain closed during operation the operating pressure of that furnace should be checked and compared to approximate operating pressures listed in this manual and the switch setting s listed above for the model family you are servicing It is important to remember that greater negative pressures are created by the furnace when HOT I E upon initial start up than when COLD I E after furnaces has been in operation for a few minutes Because of this furnace pressure should ONLY be checked when HOT to insure accurate readings The tables list approximate operating pressures They are included in this manual to provide you with a Barometer to gauge your pressures against The pressures you obtain in the field will differ slightly from these figures based upon vent length gas pressure operating temperature etc Major discrepancies in pressures will normally cause problems with pressure switch operation These Major dis crepancies should be investigated as follows Lower Lesser Negative Pressures Lower than normal negative pressures measured at the Combustion Blower may be caused by 1 Restriction on the Outlet side of the combustion blow er I E Blocked Flue Vent too long Heat Exchanger leak etc 2 Leak lack of restriction on the Inlet side of the
78. ust pipes five feet for each additional elbow used _B lt D PVC Intake Combustion Air 3 Elbows are DWV long radius type for 2 and 3 vents A NOTE Feet of pipe is whichever pipe run is the longest either ald Dimension will change accordingly as dimension D is lengthened or shortened Dimension D may be lengthened to 60 may also be shortened by cutting the pipes provided in the kit to 12 minimum 440 08 2011 00 23 Service Manual Single Stage Multi Position Furnace Figure 27 Concentric Vent Roof Installation Figure 28 riu bod Maintain 12 min clearance above highest anticipated 3 x 2 Bushings or Strap snow level of 24 above 3 x 21 3 Bushings Field Supplied Combustion Combustion roof If 3 vent not used Air Roof Boot Flashing Field Supplied Support Field Supplied __ Combustion Flush to Air 45 Elbow 1 max 45 Elbow Field Supplied Field Supplied Note 55 59 40 Securing strap must be field installed to prevent movement of termination kat in side wall NS Combustion Air Note La Ld 25 22 02 Support must be field installed to secure termination kit to structure COMBUSTION BLOWER All mode
79. water which then must be routed to a drain 4 The placement of the secondary heat exchanger at the outlet of the primary heat exchanger creates addi tional resistance to the flow of gasses 5 To overcome the resistance to convective flow of the Primary and Secondary heat exchangers requires the use of an Induced Draft Combustion Blower Assem bly 5 Service Manual Single Stage Multi Position Furnace 6 The Combustion Blower Assembly is mounted on the outlet side of the Secondary heat exchanger This blower creates a partial vacuum negative pressure within the heat exchangers drawing the flue products out of the furnace 7 switch Air Proving Switch is used as a safety device that prevents the ignition system from firing the furnace until it senses that a proper draft has been established through the furnace SEQUENCE OF OPERATION HEATING Refer to the ignition control section for sequence of opera tion ELECTRICAL SUPPLY A WARNING ELECTRICAL SHOCK HAZARD Failure to turn off power could result in death or personal injury Turn OFF electrical power at fuse box or service panel before making any electrical connections and ensure a proper ground connection is made before connecting line voltage SUPPLY CIRCUIT The furnace cannot be expected to operate correctly unless it is properly connected wired to an adequately sized single branch circuit Line voltage wires should
80. wise to decrease manifold pressure and clockwise to increase pressure Typical Gas Control Valve Honeywell Manifold Regulator Adjustment Outlet Under Cap HONEYWELL Pressure INLET OUTLET Inlet Pressure 1 8 NPT 25 24 98a Single Stage Multi Position Furnace NOTE Adjustment screw cover MUST be replaced on gas control valve before reading manifold pressure and operat ing furnace 5 Obtain gas heating value and installation site altitude 6 Set manifold pressure to value shown in Table 2 Table 3 Table 4 or Table 5 7 When the manifold pressure is properly set replace the adjustment screw cover on the gas control valve 8 Remove jumper wire from thermostat connection on furnace control board Remove manometer connec tion from manifold pressure tap and replace plug in valve Check for leaks at plug 10 Replace the burner compartment door Natural Gas Input Rating Check NOTE The gas meter can be used to measure input to fur nace Rating is based on a natural gas BTU content of 1 000 BTU s per cubic foot Check with gas supplier for actual BTU content 1 Make sure burner compartment door is in place be fore performing the following steps 2 Turn OFF gas supply to all appliances and start fur nace Natural Gas No of Seconds Time Per Cubic BTU Per BTU Content Per Hour Foot in Seconds Hour 1 000 3 600 75 000 1 000 x 3 600

MULTI POSITION 90% SINGLE STAGE GAS FURNACES

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