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9 69-0939—3
Table 2. Terminal Designations on Old and New Thermostats
a
If both RH and R terminals are present on existing thermostat, remove jumper and connect Rh to R and R to Rc.
b
Do not connect both O and B when wiring to a single stage heat pump. Connect O to O. Tape off B.
c
Tape off end of the wire with electrical tape and push the taped wire back into the wiring hole in the wall.
STEP 5. INSTALL THE BATTERIES
IMPORTANT
Three AA alkaline batteries are included with the thermo-
stat. Batteries must be installed for programming and opera-
tion of the thermostat and the heating/cooling system.
❑ Install the batteries in the wallplate so the positive terminals all
point up (see illustration).
❑ If the thermostat is already mounted on the wall, remove the
thermostat by placing your thumb between the thermostat and
wallplate and pulling the thermostat up and away as shown.
Terminal on Old Thermostat Connect To Description
R, RH
a
, 4, V
R Power
Rc, R
a
Rc Power for cooling
W, W
1
, H W Heat
Y, Y
1
, M Y Cooling
G, F G Fan
O O Changeover in cool. (Single stage heat pump only).
B
b
B
b
Changeover in heat. (Single stage heat pump only).
C
c
, X
c
, B
b
Do not connect. Transformer common
W
2
, H
2
Do not continue installation.
Call 1-800-468-1502.
Second stage heat.
Y
2
Second stage cool.
M10622
INSTALL 3 AA ALKALINE BATTERIES
AS SHOWN, POSITIVE (+) TERMINALS
TOWARD TOP.
WALLPLATE
B
RRCOWYG