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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)
Fr
o
nt Vi
ew
2.14"
(54)
Side View
2.86"
(73)