Thermo Pride OMD-70 - Manual (Page 27)

All installations and services must be performed by qualified service personnel.
“C” 24 VAC common from transformer
“CC” Compressor Contactor
“CC_COM” Compressor Contactor Common
“LOW” Continuous Blower Speed
“HEAT” Blower heat speed tap
“COOL” Blower cool speed tap
A. Inputs
Power supplies
Line voltage is applied between the “S1” and “N1” quick connect terminals. 24 VAC Class II Transformer
secondary voltage supplied to X and C
Limit switch
The 120 VAC optically isolated limit switch input is connected on pin P2-1 & 9. Refer to the Heat Mode
section for the control operation.
Thermostat call for heat “W”
24 VAC thermostat input. A call for heat is recognized when the thermostat connects “W” to “R”. This input
has an indicator LED that will light when the control receives a call for heat. Refer to the Heat 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.
B. 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.
EAC (electronic air cleaner)
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