White Rodgers 1E50N-303 - Manual

Do not use on circuits exceeding specifi ed voltage. Higher voltage will
damage control and could cause shock or fi re 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.

Installation Instructions for:

Vertical

1E50N-303

YOUR THERMOSTAT REPLACES

System

Models

Standard Heat Only Systems

Electric Furnace

Heat Pump (No Aux or Emergency Heat)

1E50N-303

Gas or Oil Heat

Millivolt Heat Only Systems

1

PREPARATIONS

Assemble tools required: power drill, fl at blade screwdriver, wire cutter/stripper,
level.

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

2

THERMOSTAT FEATURES

Captive

screws

Mounting

Screw

Mounting

Screw

COVER

THERMOSTAT

BASE

WALLPLATE

SWITCHING

SUBBASE

G

W

RH

Mounting

Screw

50

60

70

80

90

50 60

70 80

90

4

Figure 1. Thermostat with subbase or wallplate

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

CAUTION

!

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 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.

Make a note here

of the anticipator setting on the old thermostat

for future reference and use in step 5.

The heat anticipator pointer, if adjustable, will be set at one of a series of numbers
representing the current rating of the primar y control in your furnace. The number
will be one of the following: .2, .4, .8, Etc. Or 0.2, 0.4, 0.8, Etc.

3

3

REMOVING OLD THERMOSTAT (cont’d)

If no heat anticipator/indication is showing, do not be concerned ; move on to the
next step.

AT TENTION !

This product does not contain mercur y. However, this product may

replace a unit which contains mercur y.

Do not open mercur y cells. If a cell becomes damaged, do not touch any spilled
mercur y. Wearing non-absorbent gloves, take up the spilled mercur y and place into
a container which can be sealed. If a cell becomes damaged, the unit should be
discarded.

Mercur y must not be discarded in household trash. When the unit this product is
replacing is to be discarded, place in a suitable container and refer to www.white-
rodgers.com for location to send product containing mercur y.

4

MOUNTING AND WIRING

WARNING

!

A. Remove base from subbase or wallplate :

Loosen the screws on the base and

remove.

B. Mount switching subbase or wallplate :

Use the screws provided to mount the

subbase or wallplate to wall (see Fig. 1).

C. Attach wires to appropriate terminals :

Two wire systems (Heat Only). Attach

one wire to RH and one to wire W.

D. Mount Thermostat Base :

Gently push excess wire back into the wall opening

and plug hole with a fi re-resistant material, such as fi berglass insulation to pre-
vent drafts from affecting thermostat operation. Mount the thermostat base to
the subbase or wallplate using the three captive screws on the thermostat base.
(See Fig. 1) Tighten the screws securely. Proceed to Step # 5.

TERMINAL CROSS REFERENCE CHART

New

Thermostat

Other

Manufacturers’

Terminal Designation

Terminal Designation

R H

4

R H

M

R 5

R

W

W

W

H

4

W

5

Set anticipator to match the setting of your old thermostat you noted in Step 3, or, the
anticipator should be set to match the current rating stamped on your main heating
control. The heat anticipator is adjustable from 0.15 to 1.2 amps. Adjust the antici-
pator by rotating the contact arm (see fi g. 2). The anticipator setting is indicated by
the numbers on the base that the pointer points to. If you are unsure where to set the
anticipator contact the heater manufacturer for a recommended setting.

Move the pointer

counterclock wise to

lengthen

heating system cycles; move

clock wise to shorten

heating cycles. Ad-

justments should not be greater than 1/ 2
marking at a time.

For millivolt operation, rotate contact arm to
Millivolt Link.

Snap on Cover

: Carefully align the cover

with the base and snap the cover onto the
base.

Rotate contact arm
to adjust heat anticipator

Arrow points to the
current rating of
the primary control

Millivolt Link

PART NO. 37-6973A

0832

White-Rodgers is a division

of Emerson Electric Co.

www.white-rodgers.com

REMOVING OLD THERMOSTAT

Take care when securing and routing wires so they do not short to adja-
cent terminals or rear of thermostat. Personal injury and / or property da-
mage may occur.

CAUTION

!

SET HEAT ANTICIPATOR

Figure 2. Anticipator adjustment