Low Voltage Terminal Description Notes
R 24V power Power to the low voltage
thermostat.
W1 Heating Stage 1
Thermostat connects R to W1
for first stage heating.
Note: A jumper between W1
and W2 will initiate W2
speed.
W2 Heating Stage 2 Thermostat connects R to W2
for second stage heating.
Y1 Cooling Stage 1 Thermostat connects R to Y1
for first stage cooling.
Y2 Cooling Stage 2 Thermostat connects R to Y2
for second stage cooling.
G Fan Thermostat connects R to G
to energize fan for ventilation
speed.
C 24V common Common return from the
thermostat – not required for
all thermostats.
T-T
Dry Contacts
Boiler call for heat.
Auxiliary
Com
S1 O/B Reversing valve
Connects to outdoor unit on
heat pump.
Note: Energized for cooling.
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