White Rodgers 179 Thermostat User Manual

Type 179

SPDT Heating/Cooling Room Thermostat

INSTALLATION INSTRUCTIONS

WHITE-RODGERS

Operator: Save these instructions for future use!

FAILURETOREADANDFOLLOWALLINSTRUCTIONSCAREFULLYBEFORE

INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL

INJURY AND/OR PROPERTY DAMAGE.

DESCRIPTION

These room thermostats are specially designed to control

combination heating and cooling equipment that operates on

line voltage.

These controls are suitable for fans or water solenoids on

heating/cooling convectors or any similar application that re-

quires a heavy duty room thermostat with single pole, double

throw (SPDT) switch action.

PRECAUTIONS

CAUTION

NOTE

If in doubt about whether your wiring is millivolt, line, or low

voltage, have it inspected by a qualified heating and air condi-

tioning contractor or electrician.

To prevent electrical shock and/or equipment damage

disconnect electric power to system at main fuse or

circuit breaker box until installation is complete.

Do not exceed the specification ratings.

Label all wires prior to disconnection when servicing

controls. Wiring errors can cause improper and dan-

gerous operation.

Allwiringmustconformtolocalandnationalelectricalcodesand

ordinances.

This control is a precision instrument, and should be handled

carefully. Roughhandlingordistortingcomponentscouldcause

the control to malfunction.

Following installation or replacement, follow appli-

ance manufacturer’s recommended installation and/

or service instructions to insure proper operation.

This control has been accurately calibrated at the factory. Any

attempt to calibrate this control will void the White-Rodgers

warranty.

WARNING

Do not use on circuits exceeding specified voltage.

Higher voltage will damage control and could cause

shock or fire hazard.

SPECIFICATIONS

Electrical Rating

Red

Blue

Common

Open on rise

of temperature

A.C. Motor Rating 120 VAC 240 VAC

Full Load Current

Locked Rotor Current 44.5 A

Non-Inductive 24 A

7.4 A

3.7 A

22.2 A

20 A

White

Close on rise

of temperature

These controls have a single pole, double throw (SPDT) snap

action switch. The top left-hand terminal (red) is the common

terminal. The top right-hand terminal (blue) has open-on-rise

switch action. The bottom center terminal (white) has close-on-

rise switch action.

WHITE-RODGERS DIVISION

EMERSON ELECTRIC CO.

9797 REAVIS ROAD

ST. LOUIS, MISSOURI 63123-5398

PART NO. 37-0885B

Replaces 37-0885A

0017

Printed in U.S.A.

THERMOSTAT LOCATION

Proper location of the heavy duty room thermostat is very

important to insure acceptable performance. The following

general rules will help determine proper location:

Concrete

Plaster/

Drywall

Junction Box

1. It is very important to be sure that the thermostat is in an

area where air circulates around it freely.

2. Never install the thermostat on or near an outside wall.

3. Donotlocatethethermostatnearwindowsordoors,orinany

drafty area.

Themostat

Conduit

4. Don’t install the thermostat where it will be affected by “false”

heat sources (such as direct sunlight, a stove or any appli-

ance exhaust, steam lines, etc.).

inside wall

Conduit

along wall

5. Mount the thermostat on a post or a partioning wall, but be

surethattherearenopipes, ductworkorheatsourcesinthat

wall or directly behind it.

WALL INSTALLATION

The mounting plate for this thermostat has two

holes 3⁵/16”apart for attaching the control on a

standard switch box.

6. If the electrical conduit leads into a cooler or warmer room,

plugtheholearoundthewireswithfire-resistantinsulationto

prevent drafts.

Figure 1

Ceiling

If the thermostat is used with unit heaters, the following sugges-

tions for locating the thermostat may be helpful (see fig. 2).

Post

1. Position A in fig. 2 is acceptable if the thermostat is close

enough to the unit heater so that the return air to the heater

flows over the thermostat.

Partition wall

or post directly

behind unit

Unit

2. Position B is acceptable if it is not necessary to make

frequent adjustments of the dial setting.

3. Position C is acceptable if it is sufficiently far from the heater

that air flowing over the thermostat is not much above the

average room temperature.

Return Air

4. Position D is not acceptable because the post may prevent

Floor

air from circulating over the thermostat.

Figure 2

WIRING

All wiring should be done in accordance with local and national electrical codes and ordinances.

Follow the wiring instructions provided by the heating/cooling

equipment manufacturer. If none are offered, a typical circuit

application is shown at right.

Room

Manual

Fan or Water

Solenoid

Thermostat

Switch

Heating

Cooling

Line

OPERATION

To set the thermostat, simply move the dial so that the indicating

line on the case points to the desired temperature setting on the

dial.

Indicating

Line