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Thermostat call for cool, “Y”
24 VAC thermostat input. A call for cooling is recognized when the thermostat connects “Y” to “R”. This
input has an indicator LED that will light when the control receives a call for cooling. Refer to the Cool
Mode section for the control operation.
Thermostat call for dehumidification “DEHUM”
24 VAC thermostat input. A call for dehumidification is recognized when the humidistat connects
“DEHUM” to “R”. This input has an indicator that will light when the control receives a call for
dehumidification. Refer to the Cool Mode section for the control operation.
Thermostat call for fan “G”
24 VAC thermostat input. A call for fan is recognized when the thermostat connects “G” to “R”. This
input has an indicator LED in that will light when the control receives a call for fan. Refer to the Fan
Mode section for the control operation.
Outputs
PSC Control
The control shall control a five-speed indoor blower motor. Rating shall be 10 FLA, 30 LRA @ 120
VAC. Connections are made via 0.250 x 0.032” male quick connect terminals labeled “HEAT”,
“COOL”, and “LOW”. “HEAT” is energized when the heat speed blower is to run. “COOL” is energized
when the Cool speed blower is to run. “LOW” is energized during a call for fan is received or a call for
dehumidification is received.
Oil Burner
Control
The control provides dedicated contacts to operate the T-T input of an oil primary control.
Rating shall be class 2 – 24 VAC pilot duty @ 24 VAC (<200mA).
Power
The switched 120 VAC power from the LIMIT switch passes through the board between Pins 1 & 2
of connector P1.
Compressor contactor
The control provides switched 24VAC to operate a compressor contactor. Rating shall be class 2 – 24
VAC pilot duty @ 24 VAC (<200mA).
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.