White-rodgers Thermostat 1F78 User Manual download pdf (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.

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.

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

* These are four-wire, single-transformer systems.

Factory installed jumper wire between the RH

and RC terminals must remain in place.

1 2 3 4 5 6 7 8

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White-rodgers Thermostat 1F78 User Manual Page 2

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