9 69-1642
Table 2. Terminal Designations on Old and New Thermostats
aIf both RH and R terminals are present on existing thermostat, remove jumper and connect Rh to R and R to Rc.
bDo not connect both O and B when wiring to a single stage heat pump. Connect O to O. Tape off B.
cTape 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
Install three AA alkaline batteries. Batteries must be
installed for programming and operation 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, RHa, 4, V RPower
Rc, RaRc Power for cooling
W, W1, H W Heat
Y, Y 1, M Y Cooling
G, F G Fan
O O Changeover in cool. (Single stage heat pump only).
BbBbChangeover in heat. (Single stage heat pump only).
Cc, Xc, BbDo not connect. Transformer common
W2, H2Do not continue installation.
Call 1-800-468-1502.
Second stage heat.
Y2Second stage cool.
M1062
2
INSTALL 3 AA ALKALINE BATTERIES
AS SHOWN, POSITIVE (+) TERMINALS
TOWARD TOP.
WALLPLATE
B
RRCOWYG