PRESSURE SWITCHES
This furnace is supplied with two pressure switches, which monitor the flow through the combustion air/vent piping and condensate drain sys- tem. These switches
1.Blockage of combustion air piping or terminals.
2.Blockage of condensate drain piping.
3.Blockage of vent piping or terminal.
4.Failure of combustion air blower motor.
LIMIT CONTROLS
There is a high temperature limit control located on the furnace vesti- bule panel near the gas valve. This is an automatic reset control that provides over temperature protection due to reduced airflow. This may be caused by:
1.A dirty filter.
2.If the indoor fan motor should fail.
3.Too many supply or return registers closed or blocked off.
The control module will lockout if the limit trips 5 consecutive times. If this occurs, control will reset & try ignition again after 1 hour.
SECTION X: NORMAL OPERATION AND DIAGNOSTICS
NORMAL OPERATION SEQUENCE
The following describes the sequence of operation of the furnace. Refer to Owners Manual for component location.
Continuous Blower
Cooling/heating thermostats have a fan switch that has an ON and AUTO position. In the ON position the thermostat circuit is completed between terminals R and G. The motor will operate continuously on the speed tap wire that is connected to the “G” terminal on the furnace con- trol board. To obtain a different contant air circulation, change the wire to another speed wire.
Intermittent Blower - Cooling
Cooling/heating thermostats have a fan switch that has an ON and AUTO position. In the AUTO position the thermostat circuit is completed between terminals R and G when there is a call for cooling. The motor will operate on the speed tap wire that is connected to the HI COOL cooling terminal on the control board. The fan off setting is fixed at 60 seconds to improve cooling efficiency.
Heating Cycle
When the thermostat switch is set on HEAT and the fan is set on AUTO, and there is a call for heat, a circuit is completed between terminals R and W of the thermostat. When the proper amount of combustion air is being provided, the pressure switch will close, the ignition control pro- vides a
If the flame is not detected within 7 seconds of the gas valve opening, the gas valve is shut off and a retry operation begins. Also, if the flame is lost for 2 seconds during the
A momentary loss of gas supply, flame blowout, or a faulty flame probe circuit will result in a disruption in the flame and be sensed within 1.0 seconds. The gas valve will
During burner operation, a momentary loss of power for 50 milliseconds or longer will
TROUBLESHOOTING
The following visual checks should be made before troubleshooting:
1.Check to see that the power to the furnace and the ignition control module is ON.
2.The manual
3.Make sure all wiring connections are secure.
4.Review the sequence of operation. Start the system by setting the thermostat above the room temperature. Observe the system’s response. Then use the troubleshooting section in this manual to check the system’s operation.
Never bypass any safety control to allow furnace operation. To do so will allow furnace to operate under potentially hazardous conditions.
Do not try to repair controls. Replace defective controls with UPG Source 1 Parts.
Never adjust pressure switch to allow furnace operation.
FURNACE CONTROL DIAGNOSTICS
The furnace has
The SLOW flash speed is two seconds on and two seconds off.
The other flash codes listed below have the following timing: LED light will turn on for 1/3 second and off for 1/3 second. This pattern will be repeated the number of times equal to the code. There will be a two- second pause between codes. For example, the six red flash code will flash the LED light on and off six times, then will be off for two seconds. This pattern will repeat as long as the fault condition remains.
SLOW GREEN FLASH: Normal operation, no thermostat calls.
SLOW AMBER FLASH: Normal operation with call for heat.
LED STEADY OFF – If the LED light does not flash at all, check for power to the board and check for a blown fuse on the board. If the board is properly powered and the fuse is not blown, the control board may need to be replaced.
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