Installation Instructions
4
WTL
PK478
(Supersedes PK478)
161-506097-001
JUNE, 1995
Type WTL-121/Low Voltage Room Thermostat
2.75"
(70)
1.5"
(38)
5
4.75"
(121)
40 50 60 70 80
Specifications — Table A
Temp.
Contacts
Max AC Volts
Max AC Amps
Model
Range (°F)
WTL-121
40-80
SPST
30 V
1 Amp
GENERAL
Note: Type WTL 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
The proper location of the thermostat is most important to insure
that it will provide a comfortable temperature. Observe the fol-
lowing general rules when selecting a location:
1. Locate thermostat about 5’ above floor.
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.
2. Install thermostat on a partitioning wall, not on an outside wall.
3. Never expose thermostat to direct light from lamps, sun or
heating devices.
4. Avoid locations close to doors that lead outside, windows or
adjoining outside walls.
5. Avoid locations close to radiators, warm air registers or in the
direct path of heat from them.
WARNING: Not for use in hazardous environments
as described in the National Electrical Code.
Failure to comply can result in explosion or fire.
6. Make sure there are no pipes or duct work in that part of the
wall chosen for the thermostat location.
© 2010 Chromalox, Inc.
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