Backplate
24(R) - 24 Vac reference terminal Can be connected to RH or RC
by P4 jumper setting (refer to following page), or tied directly
to power source
24(C) - 24 Vac common terminal supplies remote 24 Vac power
to thermostat
RS2 - Remote Sensor terminal - Connect the sensor from RS2 to RSR
RS1 - Remote Sensor terminal - Connect the sensor from RS1 to RSR
RSR - Remote Sensor Returns - Common sensor terminal
RHU - Reference for humidifier
HUM - Energized (connected) to RHU during humidity call
W2 - Heat (stage two), energized (connected) to RH during a call for
second stage heat in heat/cool systems
W/W1 - Heat (single stage)/heat (stage one) energized
to RH during a call for heat in heat/cool systems or aux heat
in heat pump systems or Slab Heat in Slab Systems.
B - Energized to RC during non-cooling modes
O - Changeover control, energized to RC during cooling modes
Y2 - Compressor (stage two), energized to RC on two-stage
systems on call for second stage
Y/Y1 - Compressor (stag
e one), energized to RC when
compressor (or first stage) is run
G - Fan, energized to RC during call for fan
RC - Reference Cool, used for calls to cooling system
RH - Reference Heat, used for calls to heating system
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