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3
REMOVING OLD THERMOSTAT
continued from first page
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 suit-
able container. Refer to www.white-rodgers.com for location to
send product containing mercury.
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MOUNTING AND WIRING
WARNING
!
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.
Hydronic (Hot Water or Steam)
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.
2
CAUTION
!
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
RH
W
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 ap-
propriate wiring schematic (see fig. 2).
3. Place base over hole in wall and mark mounting hole loca-
tions 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 Location
This thermostat requires 2 "AAA" alkaline batteries to operate.
If
appears on the display, the batteries are low
and should be replaced with fresh "AAA" Energizer
batteries. The batteries are located on the back of the thermostat
body (see fig. 1).
Y
B
O
G
Figure 2. Typical wiring diagram for
heat only, 2-wire, single transformer systems
Other Manufacturers'
Terminal Designation
4
RH
M
W
W
H
alkaline
®
JUMPER
WIRE
THERMOSTAT
W
RC
RH
SYSTEM
Heating
System
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
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