
Page 3.1
SECTION 3
Wire Connections
If the terminal designations on your old
thermostat do not match those on the new
thermostat, refer to the chart below, or the
wiring diagrams that follow.
* O/B is used if your system is a Heat Pump.
** For instructions on connecting these terminals
see page 4.6
Wire from the
old thermostat
terminal marked
Function
Install on the
new thermostat
connector marked
G or F Fan G
Y1, Y or C
Cooling Y1
W1, W or H
Heating
W1/O/B
PowerRh, R, M, Vr, A R
C
O/B
C
Common
Rev. Valve
W2
2nd Stage Heat
RS+5
Outdoor Sensor +5vdc
RS+5**
RSGND
Outdoor Sensor Ground
RSGND**
W1/O/B*
W2
OUT OUT**
Outdoor Sensor Signal
3
Air Conditio nin
g
& Heatin
g
A
U
T
O
I
2
:
0
0
P
m
H
E
A
T
C
O
O
L
7
2
74
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