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Quick Installation Guide
Alternate wiring (for heat pumps only)
NOTES:
1. Keep R Slider Tab in the up position (1 wire).
2. If your old thermostat had both V and VR wires, stop now and contact a
qualified contractor for help.
3. If your old thermostat had separate O and B wires, attach the B wire to the C
terminal. If another wire is attached to the C terminal, stop now and contact
a qualified contractor for help.
4. If your old thermostat had Y1, W1 and W2 wires, stop now and contact a
qualified contractor for help.
5. C does not power the thermostat display or operations; batteries are always
required.
6. This model doesn't support the heat pump fault alert (L/A terminal). If this
is desired, please contact a contractor for replacement model.
Battery replacement
Batteries are required to provide power. Install fresh batteries immediately when
the low battery icon appears. The icon appears about two months before the
batteries are depleted.
Even if the low battery icon does not appear, you should replace
batteries once a year, or before leaving home for more than a
month.
If batteries are inserted within two minutes, the time and day will not have to be
reset. All other settings are permanently stored in memory, and do not require
battery power.
NOTE: When replacing batteries, alkaline batteries are recommended.
S
S
Y1
M
or
or
Y
Y
2
or
F
G
or
X
or
B
C
3
5
U
U
6
or
F
A
L/A
or
H
or
B
3
O/B
or
W
or
W1
W
2
AUX
or
X
or
X2
E
W
K
V
VR
or
or
R
Rc
12
or
W2
4
1
2
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