Chromalox PK477 User Manual

Installation instructions, Type wt room thermostat, Pk477

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PK477

161-506096-001

JUNE, 1995

4WT

Installation Instructions

(Supersedes PK477)

Type WT Room Thermostat

© 2010 Chromalox, Inc.

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 3

1

/

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.

Temp

Maximum Rating

Range

Contacts

Model

(°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)

Specifications — Table A

4.72"

(110)

Front View

2.14"

(54)

Side View

2.86"

(73)

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