Wire Identification - Hunter Internet Thermostat Installation Manual

Wire Identification

RH, R
Power wire for heating
RC
Power wire for air conditioning
Y, Y1
Controls your compressor outside
G
Controls your fan to your HVAC system
W
Furnace wire
L
Allows the heat pump to tell
the thermostat there may be a
system problem
*Only 1 reversing valve is needed to run a heat pump. If both "O" and "B" are present, "B" may be a common wire.
Pre-Installed
Jumper Clip
O
Reversing valve for the heat
pump; allows compressor to
supply air conditioning*
B
Alternate reversing valve
for the heat pump; allows
compressor to supply heat*
W2
- Second stage of heat
E
- Emergency heat
Aux
- Auxiliary wire
Y2
Second stage of cooling
C
Common wire used to
power the thermostat
when available
A
Only used with a 3 wire hot
water heating system