AIRFLOW ADJUSTMENT
Check inlet and outlet air temperatures to make sure they are within the ranges specified on the furnace rat- ing nameplate. If the airflow needs to be increased or decreased, see the wiring diagram for information on changing the speed of the blower motor.
▲! WARNING
Disconnect power to the unit before removing the blower door.
Failure to follow this warning could result in property damage, personal injury or death.
This unit is equipped with a blower door switch which cuts power to the blower and gas valve causing shut- down when the door is removed. Operation with the door removed or ajar can permit the escape of danger- ous fumes. All panels must be securely closed at all times for safe operation of the furnace.
INDOOR BLOWER TIMING
Heating: The integrated furnace control module controls the indoor blower. The blower start is fixed at 45 seconds after ignition. The
Cooling: The fan delay off period is factory set at 0 seconds. The option for 80 second delay off is field selectable (See wiring diagram).
ROOM AIR THERMOSTAT
HEAT ANTICIPATOR ADJUSTMENT
Set the thermostat heat anticipator according to the current flow measured, or the settings found in the notes on the furnace wiring diagram (found in the SERVICE FACTS or inside the furnace casing).
INSTRUCTIONS TO THE OWNERS
In the event that electrical, fuel, or mechanical failures occur, the owner should immediately turn the gas sup- ply off at the manual gas valve, located in the burner compartment. Also turn off electrical power to the fur- nace and contact the service agency designated by your dealer.
Installer’s Guide
BURNER BOX TEMPERATURE LIMIT DEVICE
All models are equipped with a manual reset tempera- ture limit located on the burner box. In case of exces- sive temperature, the limit will open and cause the cir- cuit to open which shuts off all flow of gas.
CONDITIONS AFFECTING FURNACE OPERATION
1.EXCESSIVE COMBUSTION PRESSURE (WIND IN EXCESS OF 40 M.P.H.) VENT OR FLUE BLOCKAGE
If pressure against induced draft blower outlet be- comes excessive, the pressure switch will open and shut off the gas valve until acceptable combustion pressure is again available.
2.LOSS OF FLAME
If loss of flame occurs during a heating cycle, or flame is not present at the sensor, the flame control module will close the gas valve. The flame control module will then recycle the ignition sequence, then if ignition is not achieved, it will shut off the gas valve and lock out the system.
3.POWER FAILURE
If there is a power failure during a heating cycle, the system will restart the ignition sequence auto- matically when power is restored if the thermostat still calls for heat.
4.GAS SUPPLY FAILURE
If loss of flame occurs during a heating cycle, the system integrated control module will recycle the ignition sequence, then if ignition is not achieved, the integrated control module will shut off the gas valve and lock out the system.
5.INDUCED DRAFT BLOWER FAILURE
If pressure is not sensed by the pressure switch, the contacts will remain open and not allow the gas valve to open, therefore the unit will not start. If failure occurs during a running cycle, the pressure switch contacts will open and the gas valve will close to shut the unit down.
6.CONDENSATE DRAIN BLOCKAGE
If the condensate drain is blocked, either by debris, improper draining, or by freezing condensate, the pressure switch will sense the accumulation of con- densate in the furnace drain pan. The pressure switch contacts will open and remain open, not al- lowing unit operation. The unit will not operate un- til the condensate drain has been cleared, and the condensate flows freely.
7.RESET AFTER LOCKOUT
When the integrated control module has shut the system down and gone into lockout, the system must be manually reset before the unit will restart. To reset, turn the system power off, then on, then off and then on again within 30 seconds. This may be done at the unit’s power source or at the ther- mostat. The system will not reset unless the proce- dure
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