White Rodgers 1E50N-303 installation instructions Your Thermostat Replaces, Preparations

Installation Instructions for:

Vertical1E50N-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

3 REMOVING OLD THERMOSTAT (cont’d)

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

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 container and refer to www.white- rodgers.com for location to send product containing mercury.

4 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.

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.

Captive	4
screws

WALLPLATE

60		70	80
50
				90		RH
50	60	70	80			G
				90
					THERMOSTAT
					BASE
	COVER					W

Figure 1. Thermostat with subbase or wallplate

SWITCHING

SUBBASE Mounting

Screw

Mounting

Screw

Mounting

Screw

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.

!CAUTION

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.

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

3 REMOVING OLD THERMOSTAT

!CAUTION

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.

Before removing wires from old thermostat’s switching subbase, label each wire

5 SET HEAT ANTICIPATOR

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.

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 primary control in your furnace. The number will be one of the following: .2, .4, .8, Etc. Or 0.2, 0.4, 0.8, Etc.

Move the pointer counterclockwise to lengthen heating system cycles; move clockwise 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

Millivolt Linkcurrent rating of the primary control

Figure 2. Anticipator adjustment

White-Rodgers is a division	PART NO. 37-6973A
of Emerson Electric Co.
www.white-rodgers.com	0832