Take care when securing and routing wires so they do
not short to adjacent terminals or rear of thermostat.
Personal injury and/or property damage may occur.
CAUTION
!
RH
W
B
O
Y
G
RC
A
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER
Heat
Relay
Compressor
Relay
Fan
Relay
Factory-Installed Jumper
Figure 2. Typical wiring for single transformer
heating/cooling system
Figure 3. Typical wiring for two-transformer
heating/cooling system
RH
W
B
O
Y
G
A
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER
Heat
Relay
Compressor
Relay
Fan
Relay
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER
RC
Figure 4. Typical wiring for single transformer,
single stage heat pump system
W
B
O
Y
G
A
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER
Compressor
Relay
Fan
Relay
*
* *
Factory-Installed Jumper
*
* *
Terminal energized
in cooling
Terminal energized
in heating
RH
Field-Installed Jumper
RC
TERMINAL CROSS REFERENCE CHART
New Thermostat
Terminal Designation
Other Manufacturers’
Terminal Designation
RH
4
RH
M
*
R5
*
R
RC
R
R
V
-
-
G
G
G
F
G
G
W
W
W
H
4
W
Y
Y
Y
C
Y6
Y
*These are four-wire, single-transformer systems. Factory installed
jumper wire between the
RH
and
RC
terminals must remain in place.
requires the thermostat to control the fan, contact a qualified
heating and air conditioning service person.
For single stage heat pump applications (no auxillary heat),
install a short jumper wire (not included) across terminals
W and Y. If the system has a reversing valve connection
energized in Cooling, attach it to O. If the system has a
reversing valve connection energized in Heating, attach
it to B (see Fig. 4). This thermostat
will not
provide multi-
stage heating or cooling.
D. Mount Thermostat Base:
Gently push excess wire back into
the wall opening and plug hole with a fire-resistant material,
such as fiberglass insulation to prevent drafts from affecting
thermostat operation. Mount the thermostat base to the sub-
base using the three captive screws on the thermostat base.
(See Fig. 1) Tighten the screws securely. Remove paper tag
from plastic contact cover. Proceed to Step #5.
WARNING
!
For California Residents: This product contains a
chemical known to the state of California to cause
cancer and birth defects and other reproductive harm.
