Emerson 1F78H User Manual

CONTENTS

Installation Instructions for

Heating & Air Conditioning

1F78H

Non-Programmable Thermostat

Y OUR THERMOST A T REPLACES

Typical System Compatibility Chart 1F78H

Standard Heat Only Gas or Oil Fired Systems (24 volt)* Yes Electronic Ignition Heat Only Two Wire Systems (24 volt)* Yes Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt)* Yes Standard Heat/Cool Systems (24 volt)* Yes Heat/Cool Systems Electric Heat (24 volt)* Yes Heat Only Electric Heat Systems (24 volt)* Yes Cool Only Systems (24 volt)* Yes Heat Pump Systems (No Aux or Emergency Heat)* Yes Hot Water Zone Heat Only Systems No Hot Water Zone Heat Only (Three Wire) Systems No Line Voltage Heating or Baseboard 110/240 Volt Systems No Millivolt Systems Floor or Wall Furnaces No 12 VDC Mobile Home Application No Multistage Systems No Systems Exceeding 30VAC, 1.5 Amp No

* Requires common wire for 24VAC at the thermostat

Preparations.................................................. 1

Thermostat Details ........................................ 1

Removing Old Thermostat ............................ 1

Mounting and Wiring ..................................... 2

Check Thermostat Operation ........................ 3

Configuration Menu....................................... 4

Specifications ................................................ 5

Troubleshooting ............................................ 5

PREPARATIONS

Assemble tools required as shown below.

HAND OR POWER DRILL WITH 3/16 INCH DRILL BIT, IF NEEDED

FLAT BLADE SCREWDRIVER

SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—

THERMOSTAT DOES NOT NEED TO BE LEVEL TO WORK PROPERLY

WIRE CUTTER/STRIPPER

Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage

THERMOSTAT DETAILS

Mounting

hole

W905

Clip for

Hydronic

System

W904

W905

W904

Clip for

Celsius Display

Figure 1. Thermostat base

GAS

ELEC

Electric/Gas

Switch

Mounting

hole

BRC

REMOVING OLD THERMOSTAT

CAUTION

To prevent electrical shock and/or equipment damage, disconnect electrical power to the system at the main fuse or circuit breaker until installation is complete.

Before removing wires from old thermostat’s switching subbase,

label each wire with the terminal designation it was removed from.

1. Remove Old Thermostat: A standard heat/cool thermostat

consists of three basic parts: a. The cover, which may be either a snap-on or hinge type. b. The base, which is removed by loosening all captive screws. c. The switching subbase, which is removed by unscrewing

the mounting screws that hold it on the wall or adaptor plate.

2. Shut off electricity at the main fuse box until installation is complete. Ensure that electrical power is disconnected.

3. Remove the front cover of the old thermostat. With wires still attached, remove wall plate from the wall. If the old thermostat

has a wall mounting plate, remove the thermostat and the wall mounting plate as an assembly.

4. Identify each wire attached to the old thermostat.

5. Disconnect the wires from the old thermostat one at a time. DO NOT LET WIRES FALL BACK INTO THE WALL.

6. Install new thermostat using the following procedures.

WHITE-RODGERS

EMERSON ELECTRIC CO. 9797 REAVIS ROAD ST. LOUIS, MISSOURI 63123-5398 www.white-rodgers.com

PART NO. 37-6450A

Printed in U.S.A.

0247

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 suitable container and return to White-Rodgers at 2892 Harrison Street, Batesville, AR 72501-2117 for proper disposal.

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.

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.

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 RC

Y C

* Factory installed jumper wire between the RH and RC terminals must remain in place.

Other Manufacturers’ Terminal Designation

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 appropriate 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. Place a level against bottom of base, 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.

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 by changing the first option in the configuration menu to SL (see configuration menu, page 5).

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