Chromalox Thermostat WR 80EP User Manual

Installation  
4
WR  
and  
(Supersedes PK435-4)  
PK435-5  
161-048630-001  
OPERATION INSTRUCTIONS  
JUNE, 1994  
Type WR-80EP Explosion Proof Room Thermostat  
21/  
2
Specifications – Table A  
Temp.  
Range  
(°F)  
Maximum Rating  
Model  
120V a-c  
† 115V d-c  
240V a-c † 230V d-c  
277V a-c  
480V a-c  
125Va pilot  
duty (use  
with d-c  
125Va pilot  
duty (use  
with d-c  
125Va pilot  
duty (use  
with a-c  
25 amps  
or 3000  
total watts  
22 amps  
or 5280  
18 amps  
or 5000  
total watts  
WR-80EP  
40-90  
61/  
8
contactor)  
total watts contactor)  
contactor)  
† d-c ratings not UL listed  
WR-80EP  
40 to 90°F  
UL Listed  
4”  
311/16”  
GENERAL  
Positive accuracy, long and reliable service, 3° differential. Heavy-  
duty, single stage, SPST line voltage snap-acting switch. Patented  
hydraulic element. WR-80EP has external, coiled sensing element and  
a low position which drops control point to keep heater off.  
Uses — Automatically controls room temperature by turning electric  
air heaters on and off. Can be used to control the air heaters directly,  
within thermostat rating. For higher ratings use thermostat with mag-  
netic contactor. Place thermostat on inside wall, away from undue  
heating or cooling influences, about 4 feet above the floor. The explo-  
sion proof WR-80EP is suitable for Class I, Group D and Class II,  
Groups E, F and G locations.  
WARNING: Users should install adequate back-up con-  
trols and safety devices with their electric heating  
equipment. Where the consequences of failure may  
be severe, back-up controls are essential. Although  
the safety of the installation is the responsibility of  
the user, Chromalox will be glad to assist in making  
equipment recommendations.  
Principle of Operation — Control action of these thermostats is pro-  
vided through the principle of liquid volume change. With a variation in  
temperature, the liquid in the sensing element expands or contracts,  
causing a bellows to actuate the switching mechanism.  
NOTICE: Type WR thermostats are designed for temperature control  
service only. Because they do not fail safe, they should not be used for  
temperature limiting duty.  
Housing — The control housing and cover assembly is of heavy-duty  
cast aluminum.  
MOUNTING  
Note: Do not mount control where it will be subject to vibration,  
shock, grease, dust, lint or corrosive vapors. Do not mount adjacent to  
a large magnetic contactor, as vibration and shock will cause thermo-  
stat to interact erratically – resulting in chattering of the contactor.  
5. If electrical conduit leads into cooler or warmer room, plug up  
space around wires in the conduit with rock wool.  
111  
/
16  
WARNING: Do not twist or uncoil the coiled element  
on top of the case.  
11/16  
The proper location of a heavy duty room thermostat is important to  
assure good performance.  
4
61/8  
1. Locate where air circulates freely.  
2. Never install on or near outside wall.  
3. Keep away from windows or doors.  
4. Do not locate too close to strong light or other false source of heat,  
such as sunlight, steam lines, etc.  
215  
45/8  
/
16  
311  
/
5
16  
/8  
11/16  
4-Holes  
16" Dim.  
5
/
45/8  
1
2
/
-14  
Figure 1  
N.P.T. Thread  
© 2010 Chromalox, Inc.  
 

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