All installations and services must be performed by qualified service personnel.
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The switched 120 VAC power from the LIMIT switch passes through the board between Pins 1 & 2 of
connector P1.
EAC (electronic air cleaner)
The control provides a 120 VAC output for an electronic air cleaner. This output is energized whenever
the fan motor is energized (either low, heat or cool speed). Connection is made via male quick connect
terminal labeled “EAC”.
Humidifier
The control provides a 120 VAC output for a humidifier. Connections are made to a male quick connect
terminal labeled “FAN”. The control does not switch this output, it provides a pass-through connection
from P1-7 from the switched primary voltage of the Burner Module.
Status LED
A red LED is provided to indicate any thermostat input has been recognized by the microprocessor on the
control. See Diagnostic Features for a function description of operation.
Thermostat Input LEDs
Four green LEDs are placed beneath their respective thermostat connections (W, Y, G and DEHUM) and
operate whenever a call is present. See Diagnostic Features for a function description of operation.
C. Operating Modes
Standby Mode
All outputs are off and the control is waiting for a thermostat demand. The thermostat inputs, and limit
switch are continuously monitored. The control initiates action when a thermostat call is received or limit
switch opens.
Fan Mode
A call for fan (“G”) is received from the thermostat. If no other mode is calling for blower operation, the
control will operate the fan relay (K4) and power the “Low” blower speed terminal. The fan mode will be
operated as long as the “G” input is calling and neither the Heat mode nor the Cool mode is calling for
blower operation. When the Heat and Cool modes call for blower operation, their respective outputs will
take precedence after their respective turn-on time delays have expired.
Cooling Mode
A call for cool (“Y”) is received from the thermostat. If the heat mode is not active or the anti-short cycle
delay is not in effect, the control will energize the “CC” terminal and after a 10 second power demand
conservation delay energizes the “COOL” speed blower terminal.
When the call for cool is satisfied, the “CC” terminal is de-energized and the cooling off delay of 45
seconds is started. Forty-five seconds later the “COOL” speed blower terminal is de-energized and the
control reverts to Standby Mode.
Dehumidification Operation
If a call for dehumidification is received while the Cool Mode is active, blower speeds will be reduced.
The PSC “COOL” blower speed terminal (1158-100 model only) will be de-energized and “Low” blower
speed will be energized.
Anti-Short Cycle Operation
Summary of Contents for OME-72D36
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