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Boiler or radiant system with air handler and conventional cooling or
heat pump.
C
RC
RH
W1
W2
AC+
AC-
RT+
RT-
S
G
Y1
Y2
O/B
Y1Y2RCG
Air handler
Y1Y2CO/B
Air conditioner or
Heat pump
W1RW2
Boiler
Stage 2 heat and
cool if applicable
*Reversing valve
for heat pumps only
Note: Do not jumper RC
or RH,T18 does this
automatically, R wire need
to go into the RC terminal
on your T18.
Accessory devices
The T18 can control an accessory HVAV device like a humidifier, dehumidifier, or
ventilation device from its AC terminals.
Note:You will need to configure the accessory device when you first power on your T18.
2-wire accessory (humidifier/dehumidifier/ventilator)
C
RC
RH
W1
W2
AC+
AC-
RCGYWWire1 Wire2
Furnace control board
Accessory
RT+
RT-
S
G
Y1
Y2
O/B
43 44
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