Instructions / Assembly

A. Remove base from subbase: Loosen the three screws
on the base and remove.
B. Mount switching subbase/adaptor plate: Use the screws
provided to mount the subbase and adaptor plate (optional) to
wall (see Fig. 1).
C. Attach wires to appropriate terminals:
• For two wire systems (Heat Only or Cool Only). If you
have a two-wire Heat Only system, attach one wire to RH
and one to wire W. If you have a two-wire Cool Only system,
attach one wire to RC and one to wire to Y. Leave the factory
installed jumper between RC and RH attached. Tighten any
unused terminals securely.
• If your system has more than two wires: Use the cross
reference chart to determine correct wire connections. If you
have a four-wire heat/cool system leave the factory installed
jumper between RC and RH attached (see Fig 2.). If your
system has five wires remove the factory installed jumper
between RC and RH (see Fig 3.).
• Electric heat or single stage heat pump systems: This
thermostat is configured from the factory to operate a heat/
cool, fossil fuel (gas, oil, etc.) forced air system. It is configured
correctly for any system that DOES NOT require the thermo-
stat to energize the fan on a call for heat. If your system is
an electric heat or heat-pump system that REQUIRES the
thermostat to turn on the fan on a call for heat, remove the
yellow factory-installed jumper wire from the Y terminal and
connect
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.
TERMINAL CROSS REFERENCE CHART
New Thermostat
Terminal Designation
Other Manufacturers’
Terminal Designation
RH
RC
G
W
Y
4
R
G
W
Y
RH
R
G
W
Y
M
V
F
H
C
R5
-
G
4
Y6
R
-
G
W
Y
**
* These are four-wire, single-transformer systems.
Factory installed jumper wire between the RH
and RC terminals must remain in place.
it to the A terminal. This will allow the thermostat to energize
the fan immediately on a call for heat. If you are unsure if the
heating system requires the thermostat to control the fan, con-
tact a qualified heating and air conditioning service person.
For single stage heat pump applications (no auxiliary 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.
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 GA
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 BO YG 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
Do not use on circuits exceeding specified voltage. Higher
voltage will damage control and could cause shock or fire
hazard.
Do not short out terminals on gas valve or primary control
to test. Short or incorrect wiring will damage thermostat and
could cause personal injury and/or property damage.
Thermostat installation and all components of the system
shall conform to Class II circuits per the NEC code.
WARNING
!
CAUTION
!
ATTENTION! This product does not contain mercury. How-
ever, this product may replace a unit which contains mercury.
Do not open mercury cells. If a cell becomes damaged, do not
touch any spilled mercury. Wearing non-absorbent gloves, take
up the spilled mercury and place into a container which can be
sealed. If a cell becomes damaged, the unit should be discarded.
Mercury must not be discarded in household trash. When the unit
this product is replacing is to be discarded, place in a suitable
container. Refer to www.Thermostat-recycle.org for location to
send the product containing mercury.
3
REMOVING OLD THERMOSTAT
CONTINUED FROM FIRST PAGE
4
MOUNTING AND WIRING
www.white-rodgers.com