White Rodgers Thermostat 1F78 - Manual (Page 2)

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MOUNTING AND WIRING
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 con-
tainer. Refer to www.white-rodgers.com for location to send product
containing mercury.
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REMOVING OLD THERMOSTAT
CONTINUED FROM FIRST PAGE
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.
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 thermostat to energize
the fan on a call for heat. If your system is an electric or heat-pump
system that REQUIRES the thermostat to turn on the fan on a call
for heat, locate the
ELEC/GAS switch (see fig. 1) and switch it to
the ELEC position. This will allow the thermostat to energize the
fan immediately on a call for heat. If you are unsure if the heating/
cooling system requires the thermostat to control the fan, contact a
qualified heating and air conditioning service person.
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.
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. If necessary, move the electric
heat switch (see
ELECTRIC HEAT SYSTEMS, above).
2. Connect wires beneath terminal screws on base using appropri-
ate wiring schematic (see figs. 2 through 7).
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 mount-
ing 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
®
alkaline batteries.
The batteries are located on the back of the thermostat body (see
fig. 1).
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
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.