Chromalox Thermostat WTL 121 User Manual

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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