Chromalox PK477 installation instructions Installation Instructions, Type WT Room Thermostat

Installation Instructions

4	WT
(Supersedes PK477)	PK477

161-506096-001

JUNE, 1995

Type WT Room Thermostat

2.86"

(73)

2.14"

(54)

4.72"

(110)

Front View Side View

Specifications — Table A

	Temp			Maximum Rating
Model	Range	Contacts
	(°F)		128V AC	208V AC	240V AC	277V AC	Pilot Duty
							125V AC
WT-121	45-75	SPST	22 amps	22 amps	22 amps	18 amps	(use with
			or 2640	or 4575	or 5280	or 5000	AC
WT-122	45-75	DPST	total watts	total watts	total watts	total watts	contactor)

GENERAL

Note: Type WT thermostats are designed for temperature control service only. Because they do not fail safe, they should not be used for temperature limiting duty.

WARNING: Users should install adequate back-up controls and safety devices with their electric heating equipment. Where the consequences of failure may be severe, back-up controls are essen- tial. Although the safety of the installation is the responsibility of the user, Chromalox will be glad to make equipment recommendations.

WARNING: Not for use in hazardous environments as described in the National Electrical Code. Failure to comply can result in explosion or fire.

Thermostat Location

1.Mount in any standard electrical outlet box. Use of extra deep box (3” x 2” x 31/2”) makes for easier wiring.

2.Locate outlet box about 5’ above floor on inside wall.

3.Box location should be representative of the area to be con- trolled. Avoid locations that are subject to drafts or false exter- nal heat (such as solar radiation, direct heat from heaters, etc.). Insure that the wall selected is capped to prevent drafts within the wall.

© 2010 Chromalox, Inc.