Installation Instructions
4
WT
161-506096-001
PK477
(Supersedes PK477)
JUNE, 1995
Type WT Room Thermostat
2.86"
(73)
2.14"
(54)
4.72"
(110)
Front View
Side View
Specifications — Table A
Temp
Range
(°F)
Maximum Rating
240V AC
Contacts
Model
128V AC
208V AC
277V AC Pilot Duty
125V AC
WT-121
WT-122
45-75
45-75
SPST
DPST
22 amps
or 2640
22 amps
or 4575
22 amps
or 5280
18 amps (use with
or 5000
AC
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.
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.
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.
© 2010 Chromalox, Inc.
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