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33

Gas Input Rate Measurement (Natural Gas 

Only)

INLET GAS SUPPLY PRESSURE 

 Natural Gas

Minimum: 4.5” w.c.

Maximum: 10.0” w.c.

Propane Gas

Minimum: 11.0” w.c. Maximum: 13.0” w.c.

The actual gas input rate to the furnace must never be greater 

than that specified on the unit rating plate.  To measure natural 

gas input using the gas meter, use the following procedure.

1.  Turn  OFF  the  gas  supply  to  all  other  gas-burning 

appliances except the furnace.

2.  While the furnace is operating at high fire rate, time 

and record one complete revolution of the gas meter 

dial measuring the smallest quantity, usually the dial 

that indicates 1/2 cu. ft. per revolution. You will use 

this number to calculate the quantity of gas in cubic 

ft. if the furnace would consume if it ran steadily for 

one hour (3600 seconds).

3.  If the 1/2 cu. ft. dial was used, multiply your number x 2. 

   EXAMPLE:  If  it  took  23  seconds  to  complete  one 

revolution of the 1/2 ft. dial (23 x 2 = 46).

This tells us that at this rate, it would take 46 seconds to 

consume one cu. ft. of gas. 3600 / 46 = 78.
This tells us that in one hour, the furnace would consume 

78 cu. ft. of gas.
The typical value range for 1 cu. ft. of natural gas is around 

1000 BTU. Check with your gas utility, if possible.  In this 

example, the furnace is consuming 78,000 BTUH.

 

NOTE:

  The final manifold pressure cannot vary 

by more than ± 0.3” w.c. for Natural and 

+

 0.5” for 

LP from the specified setting.  Consult your local 

gas supplier if additional input rate adjustment is 

required.

4.  Turn  ON  gas  to  and  relight  all  other  appliances 

turned  off  in  step  1.  Be  certain  that  all  appliances 

are functioning properly and that all pilot burners are 

operating.

Temperature Rise

Temperature rise must be within the range specified on the 

unit rating plate. An incorrect temperature rise may result 

in condensing in or overheating of the heat exchanger.  An 

airflow and temperature rise table is provided in the Specifi

-

cation Sheet applicable to your model.  Determine and adjust 

temperature rise as follows:

1.  Operate furnace with burners firing for approximately 

ten  minutes.  Ensure  all  registers  are  open  and  all 

duct dampers are in their final (fully or partially open) 

position.

2.  Place thermometers in the return and supply ducts 

as close to the furnace as possible. Thermometers 

must not be influenced by radiant heat by being able 

to “see” the heat exchanger.

3.  Subtract the return air temperature from the supply 

air temperature to determine the air temperature rise.  

Allow  adequate  time  for  thermometer  readings  to 

stabilize.

4.  Adjust  temperature  rise  by  adjusting  the  circulator 

blower  speed.  Increase  blower  speed  to  reduce 

temperature rise. Decrease blower speed to increase 

temperature  rise.  Refer  to 

Startup Procedure and 

Adjustment - Circulator Blower Speeds

  for  speed 

changing details.

SUPPLY

    AIR

RETURN

    AIR 

Temperature Rise Measurement

Figure 45

T

O

 

AVOID

 

PERSONAL

 

INJURY

 

OR

 

DEATH

 

DUE

 

TO

 

ELECTRICAL

 

SHOCK

TURN

 OFF 

POWER

 

TO

 

THE

 

FURNACE

 

BEFORE

 

CHANGING

 

SPEED

 

TAPS

.

WARNING

Blower Heat Off Delay Timings

The integrated control module provides a selectable heat off 

delay function. The heat off delay period may be set to 90, 

120, 150, 180 seconds. The delay is factory shipped at 150 

seconds but may be changed to suit the installation require

-

ments and/or homeowner preference. 

Summary of Contents for C9C96 Series

Page 1: ...NOTE Please contact your distributor or our website for the applicable Specification Sheet referred to in this manual Thesefurnacescomplywithrequirements embodied in the American National Standard Na...

Page 2: ...pane Gas High Altitude Installations 11 Condensate Drain Lines Drain Trap 18 Electrical Connections 23 Gas Supply and Piping 26 Circulating Air Filters 29 Startup Procedure Adjustment 31 Airflow Table...

Page 3: ...manual Always install a furnace to operate within the furnace s intended temperature rise range with a duct system which has external static pressure within the allowable range as specified on the fu...

Page 4: ...and for a thorough investigation of each claim The distributor or manufacturer will not accept claims from dealers for transportation damage SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OF...

Page 5: ...os cuartos de servicio B10259 216 El mon xido de carbono puede causar enfermedades severas como da o cerebral permanente muerte Las emisiones de mon xido de carbono pueden circular a trav s del aparat...

Page 6: ...capacity of the furnace should be greater than or equal to the total heat loss of the area to be heated The total heat loss should be calculated by an approved method or in accordance with ASHRAE Guid...

Page 7: ...ace must face the same direction If the furnace is installed in a residential garage position the furnace so that the burners and ignition source are located not less than 18 inches 457 mm above the f...

Page 8: ...thin 12 inches of the bottom of the confined space In a typical construction the clearance between the door and door frame is usually ade quate to satisfy this ventilation requirement CARBON MONOXIDE...

Page 9: ...tilateurs les registres de foyer et tous les autres appareils de combustion aliment s au gaz doivent tre remis dans leur tat initial AVERTISSEMENT Existing Furnace Removal NOTE When an existing furnac...

Page 10: ...oors and windows These changes have helped in reducing heating cooling costs but have created a problem supplying combustion and ventilation air for gas fired and other fuel burning appliances Applian...

Page 11: ...bing Drain Trap and Lines In horizontal applications the condensate drain trap is secured to the furnace side panel suspending it below the furnace A minimum clearance of 5 5 below the furnace must be...

Page 12: ...utdoors as the vent pipe or flue pipe The pipe that supplies air for combustion to the furnace will be referred to as the intake pipe or combustion air pipe This furnace is dual certified and may be i...

Page 13: ...S ULC S636 WARNING Upon completion of the furnace installation carefully inspect the entire flue system both inside and outside of the furnace to assure it is properly sealed Leaks in the flue system...

Page 14: ...e Termination Forced Air Inlet Non Direct Vent Direct Vent Vent Flue Terminations Grade or Highest Anticipated Snow Level Vent Clearances Figure 7 VENT DRAIN RF000142 Coupling Figure 8 WARNING Edges o...

Page 15: ...35 30 25 20 15 10 5 NA 3 103 96 89 82 75 68 61 54 2 45 40 35 30 25 20 15 10 3 110 103 96 89 82 75 68 61 MEC96 CEC96 Direct Vent 2 Pipe and Non Direct Vent 1 Pipe 6 Maximum Allowable Length of Vent Flu...

Page 16: ...e 12 The RF000142 coupling Figure 8 can be secured directly to the furnace intake coupling if condensation is a concern If the RF000142 is used on the combustion air inlet it must be installed with th...

Page 17: ...tion Dual Pipe Figure 18 VENT FLUE TEE COMBUSTION AIR INTAKE DISTANCE BETWEEN COMBUSTION AIR INTAKE AND GRADE DISTANCE BETWEEN VENT AND GRADE Figure 19 Combustion Air Intake may also be snorkeled to o...

Page 18: ...ducts of combustion to the point where condensation takes place The condensate must be collected in the furnace drain trap and routed to an appropriate drain location in compliance with local and nati...

Page 19: ...THE LATEST EDITION OF THE NATIONAL ELECTRIC CODE WARNING WARNING TO AVOID THE RISK OF INJURY ELECTRICAL SHOCK OR DEATH THE FURNACE MUST BE ELECTRICALLY GROUNDED IN ACCORDANCE WITH LOCAL CODES OR IN TH...

Page 20: ...ection Insert hose 2 from outside the cabinet through the cabinet drain hole nearest the top Secure it to the barbed fitting in the elbow with a red clamp 6 For models DM96VE0303AN DM96VE0403AN and DM...

Page 21: ...the RF000142 Coupling Locate hose 2 factory installed Cut off and discard the 45 radius end 2 Install 90 radius end of hose 2 on RF000142 drain outlet and secure with a red clamp 3 Insert coupling in...

Page 22: ...to obtain the respective hoses needed for installation and install per the following directions 1 Remove the drain trap and factory installed drain tube assemblies 2 Remove two 1 plugs from right sid...

Page 23: ...ection of hose 4 to the 100 elbow and the PVC pipe and secure with red clamps 15 Connect the hoses to the trap inlets and secure with silver clamps drain trap outlet must point to the original bottom...

Page 24: ...configured for a left side electrical connection To make electrical connections through the opposite side of the furnace the junction box must be relocated to the left side prior to making electrical...

Page 25: ...ump or gas furnace A heat pump thermostat with three stages of heat is required to properly use a two stage furnace in conjunction with a heat pump Refer to the fossil fuel kit installation instructio...

Page 26: ...any time the draft inducer is powered See con nection diagram below Note This is a 24 volt circuit only the common connection must be on C terminal of the low voltage terminal strip where thermostat...

Page 27: ...ng from an appro priate manufacturer s propane gas conversion kit Taps for measuring the gas supply pressure and manifold pressure are provided on the valve The gas valve has a manual ON OFF control l...

Page 28: ...long nipple is required For models with a hook shaped manifold a 2 long nipple is required Asemi rigid connector to the gas piping can be used outside the cabinet per local codes From the elbow the le...

Page 29: ...the return duct connected to the furnace NOTE Ductwork must never be attached to the back of the furnace For upflow installations requiring 1800 CFM or more use either two side returns or bottom retur...

Page 30: ...changer can be viewed for visual light inspection or such that a sampling probe can be inserted into the airstream The access panel must be made to prevent air leaks when the furnace is in operation W...

Page 31: ...d or other suitable method to prevent air leakage For optimal performance verify that all door gaskets are properly in place and replace as needed to prevent air leakage Drain Trap Priming The drain t...

Page 32: ...ed with the burners operating To measure and adjust the manifold pressure use the following procedure 1 Turn OFF gas to furnace at the manual gas shutoff valve external to the furnace 2 Turn off all e...

Page 33: ...f in step 1 Be certain that all appliances are functioning properly and that all pilot burners are operating Temperature Rise Temperature rise must be within the range specified on the unit rating pla...

Page 34: ...90 1251 1221 1186 F09 1468 1436 1393 1359 1323 1285 1248 1210 F01 1167 1124 1087 1040 995 954 916 869 F02 1317 1277 1240 1201 1161 1122 1081 1045 F03 733 669 606 543 482 424 372 300 F04 1217 1174 1130...

Page 35: ...028 983 943 F01 1167 43 1124 44 1087 46 1040 48 995 50 954 916 869 F03 733 N A 669 N A 606 N A 543 N A 482 N A 424 372 300 F04 1217 41 1174 42 1130 44 1086 46 1045 48 1003 962 925 F02 1317 54 1277 56...

Page 36: ...ESSURE INCHES WATER COLUMN M9C960303AN Y Y1 M9C960803BN Y Y1 M9C960804CN Y Y1 M9C961004CN M9C961005CN M9C961205DN Y Y1 Y Y1 Y Y1 HIGH STAGE COOLING AIFLOW 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 CFM CFM CFM C...

Page 37: ...1 1217 1181 1146 1112 1072 F06 901 851 801 746 690 638 587 543 F07 1112 1076 1032 992 949 905 858 819 F08 1290 1252 1215 1182 1143 1107 1071 1032 F09 1471 1440 1409 1377 1347 1314 1283 1247 F01 1289 1...

Page 38: ...916 868 F05 1321 54 1287 55 1251 57 1217 58 1181 60 1146 1112 1072 F01 1289 39 1234 40 1180 42 1122 44 1058 47 991 917 840 F03 1297 38 1246 40 1199 42 1142 44 1083 46 1020 949 872 F04 1194 42 1137 44...

Page 39: ...speed number every time Left Right switches are pressed Table below shows the available speeds for Low High heat mode 3 When the center switch is pressed the current displayed speed shall be selected...

Page 40: ...08 F09 TWO STAGE COOLING SPEED TABLE FOR 2 STAGE IFC Cooling Mode Low Stage Cooling Mode Sequence On a call for low stage cooling the Y Y1 or Y Y1 and G ther mostat contacts close signaling the furnac...

Page 41: ...t still exists the control will return to lockout Refer to the Troubleshooting Chart for aid in determining the cause Safety Circuit Description A number of safety circuits are employed to ensure safe...

Page 42: ...er of the same type and size TO ENSURE PROPER UNIT PERFORMANCE ADHERE TO THE FILTER SIZES GIVEN IN THE RECOMMENDED MINIMUM FILTER SIZE TABLE OR SPECIFICATION SHEET APPLICABLE TO YOUR MODEL CAUTION Fil...

Page 43: ...er Only Annually inspect the drain tubes drain trap and field sup plied drain line for proper condensate drainage Check drain system for hose connection tightness blockage and leaks Clean or repair as...

Page 44: ...Cool On Delay Delay Seconds Default set at 7 Secs Adjustments can be made in 7 Secs increments from0 to 35 Secs Cool Off Delay Delay Seconds Default set at 65 Secs Adjustments can be made in 5 Secs in...

Page 45: ...with no furnace operation Inspect pressure switch hose repair replace if necessary Blocked flue and or inlet air pipe blocked drain system or weak induced draft blower Circulator blower runs continuo...

Page 46: ...AT AT 0 7 AMPS 2 MANUFACTURER S SPECIFIED REPLACEMENT PARTS MUST BE USED WHEN SERVICING 3 IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE FURNACE MUST BE REPLACED IT MUST BE REPLACED WITH WIRING MATE...

Page 47: ...ize no less than one half 1 2 inch in size GAS VENT DIRECTLY BELOW KEEP CLEAR OF ALL OBSTRUCTIONS 4 INSPECTION The state or local gas inspector of the side wall horizontally vented gas fueled equipmen...

Page 48: ...lta T Difference between Supply and Return Temperatures DB F GAS PRESSURES Gas Inlet Pressure IN W C Gas Manifold Pressure Low Fire IN W C Gas Manifold Pressure High Fire IN W C Gas Type NG Natural Ga...

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