Chromalox Thermostat PK477 User Manual

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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