White-rodgers Thermostat 1F78 User Manual download pdf (Page 2)

MOUNTING AND WIRING

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.

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 and return to White-Rodgers at 2895 Harrison Street,

Batesville, AR 72501-2117 for proper disposal.

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 sys-

tem shall conform to Class II circuits per the NEC code.

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.

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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 GAS/ELECTRIC switch (see

fig. 1) and switch it to the ELECTRIC 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 cover 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 appro-

priate 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

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 “LO BATTERY” is displayed, the batteries are low and should

be replaced with fresh “AAA” Energizer

alkaline batteries. To

replace the batteries, install the batteries along the top of the base

(see fig. 1). The batteries must be installed with the positive(+)

ends to the right.

1 2 3 4 5 6

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White-rodgers Thermostat 1F78 User Manual Page 2

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