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2
RH
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 2. Typical wiring diagram for
heat only, 2-wire, single transformer systems
TRANSFORMER
Heating
System
Y
RC
JUMPER
WIRE
OB
3
REMOVING OLD THERMOSTATREMOVING OLD THERMOSTAT
REMOVING OLD THERMOSTATREMOVING OLD THERMOSTAT
REMOVING OLD THERMOSTAT
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continued from first pagecontinued from first page
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ATTENTION! ATTENTION!
ATTENTION! ATTENTION!
ATTENTION! This product does not contain mercury.
However, 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 and return to White-Rodgers at 2895 Harrison
Street, Batesville, AR 72501-2117 for proper disposal.
WARNING
!
Do not use on circuits exceeding specified voltage.Do not use on circuits exceeding specified voltage.
Do not use on circuits exceeding specified voltage.Do not use on circuits exceeding specified voltage.
Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could causeHigher voltage will damage control and could cause
Higher voltage will damage control and could causeHigher voltage will damage control and could cause
Higher voltage will damage control and could cause
shock or fire hazard.shock or fire hazard.
shock or fire hazard.shock or fire hazard.
shock or fire hazard.
Do not short out terminals on gas valve or primaryDo not short out terminals on gas valve or primary
Do not short out terminals on gas valve or primaryDo not short out terminals on gas valve or primary
Do not short out terminals on gas valve or primary
control to test. Short or incorrect wiring will dam-control to test. Short or incorrect wiring will dam-
control to test. Short or incorrect wiring will dam-control to test. Short or incorrect wiring will dam-
control to test. Short or incorrect wiring will dam-
age thermostat and could cause personal injuryage thermostat and could cause personal injury
age thermostat and could cause personal injuryage thermostat and could cause personal injury
age thermostat and could cause personal injury
and/or property damage.and/or property damage.
and/or property damage.and/or property damage.
and/or property damage.
Thermostat installation and all components of theThermostat installation and all components of the
Thermostat installation and all components of theThermostat installation and all components of the
Thermostat installation and all components of the
system shall conform to Class II circuits per thesystem shall conform to Class II circuits per the
system shall conform to Class II circuits per thesystem shall conform to Class II circuits per the
system shall conform to Class II circuits per the
NEC code.NEC code.
NEC code.NEC code.
NEC code.
4
MOUNTING AND WIRINGMOUNTING AND WIRING
MOUNTING AND WIRINGMOUNTING AND WIRING
MOUNTING AND WIRING
Hydronic (Hot Water or Steam)Hydronic (Hot Water or Steam)
Hydronic (Hot Water or Steam)Hydronic (Hot Water or Steam)
Hydronic (Hot Water or Steam)
Heating SystemsHeating Systems
Heating SystemsHeating Systems
Heating Systems
This thermostat is set to operate properly with a forced-air
heating system. If you have a hydronic heating system (a
system that heats with hot water or steam), you must set the
thermostat to operate properly with your system.
The factory default setting is forced air heat. Clipping jumper
W905 on the circuit board will produce a longer heating cycle
which is normally for hot water or steam (hydronic) systems.
Both settings produce a very accurate temperature control and
can be set to your personal preference. As received, the
thermostat cycles the system just under 1°F. With W905
clipped, the system cycles at approximately 1.5°F.
Attach Thermostat Base to WallAttach Thermostat Base to Wall
Attach Thermostat Base to WallAttach Thermostat Base to Wall
Attach Thermostat Base to Wall
1. Remove the packing material from the thermostat. Gently
pull the body straight off the base. Forcing or prying on the
thermostat will cause damage to the unit.
2. Connect wires beneath terminal screws on base using
appropriate wiring schematic (see fig. 2).
3. Place base over hole in wall and mark mounting hole
locations on wall using base as a template.
4. Move base out of the way. Drill mounting holes.
5. Fasten base loosely to wall, as shown in fig. 1, using two
mounting screws. Adjust until level, and then tighten
screws. (Leveling is for appearance only and will not affect
thermostat operation.) If you are using existing mounting
holes, or if holes drilled are too large and do not allow you
to tighten base snugly, use plastic screw anchors to secure
subbase.
6. Push excess wire into wall and plug hole with a fire-
resistant material (such as fiberglass insulation) to prevent
drafts from affecting thermostat operation.
Battery LocationBattery Location
Battery LocationBattery Location
Battery Location
This thermostat requires 2 “AAA” alkaline batteries to operate.
If
“LO BATTERY”“LO BATTERY”
“LO BATTERY”“LO BATTERY”
“LO BATTERY” appears on the display, the batteries are low
and should be replaced with fresh “AAA” Energizer
®
alkaline
batteries. The batteries are located on the back of the thermo-
stat body (see fig. 1).
Take care when securing and routing wires so they doTake care when securing and routing wires so they do
Take care when securing and routing wires so they doTake care when securing and routing wires so they do
Take care when securing and routing wires so they do
not short to adjacent terminals or rear of thermostat.not short to adjacent terminals or rear of thermostat.
not short to adjacent terminals or rear of thermostat.not short to adjacent terminals or rear of thermostat.
not short to adjacent terminals or rear of thermostat.
Personal injury and/or property damage may occur.Personal injury and/or property damage may occur.
Personal injury and/or property damage may occur.Personal injury and/or property damage may occur.
Personal injury and/or property damage may occur.
CAUTION
!
New ThermostatNew Thermostat
New ThermostatNew Thermostat
New Thermostat
Other Manufacturers’Other Manufacturers’
Other Manufacturers’Other Manufacturers’
Other Manufacturers’
Terminal DesignationTerminal Designation
Terminal DesignationTerminal Designation
Terminal Designation
Terminal DesignationTerminal Designation
Terminal DesignationTerminal Designation
Terminal Designation
RH 4 RH M
WWWH
TERMINAL CROSS REFERENCE CHARTTERMINAL CROSS REFERENCE CHART
TERMINAL CROSS REFERENCE CHARTTERMINAL CROSS REFERENCE CHART
TERMINAL CROSS REFERENCE CHART