Installation
and
OPERATION INSTRUCTIONS
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| WCRT |
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| (Supersedes |
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161-562767-001
DECEMBER, 1998
WCRT Weather-Corrosion
Resistant Room
Thermostat
Specifications – Table A
| Temperature | Switch |
| Maximum Rating | ||
Model | Range (°F) | Action | Description | 120 Vac | 240 Vac | 277 Vac |
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| Full Load Inductive | 16.0A | 12.0A | 10.0A |
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SPDT | Locked Rotor | 80.0A | 60.0A | 55.0A | ||
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| 25.0A | 25.0A | 22.0A | |
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| Pilot Duty | 125VA | 125VA | 125VA |
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UL LISTED
Figure 1
GENERAL
Type WCRT thermostats are intended for use in harsh environ- ments. They tolerate continuous spraying with water, high humid- ity, airborne contaminates and moderately corrosive conditions. The nickel plated sensing bulb is attached directly to the bottom of the case where it is shielded from damage or accumulations of insulating particles. The molded Noryl case is sealed at the cover with a neoprene gasket and the adjusting knob opening is closed with a lubricated O ring. Underwriters Laboratories has tested the WCRT and found it meets the requirement for NEMA 4X areas.
High levels of accuracy and sensitivity, 21/2° differential, are pro- vided by the WCRT. Switching is done by heavy duty, precision, single stage, SPDT line voltage snap action switch. Setting is accomplished by rotating the adjusting knob. The dial face is print- ed with large, contrasting numbers and letters on a lustrous back- ground for good visibility. Color coding clearly identifies the func- tion of each conductor.
Applications – Automatically controls room temperature by turn- ing electric air heaters on and off. Can be used to control the air heaters directly, within thermostat rating. For higher ratings use thermostat with magnetic contactor. Place thermostat on inside wall, away from undue heating or cooling influences, about 4 feet above the floor.
NOTICE: Type WCRT thermostats are designed for temperature control service only. Because they do not fail safe, they should not be used for temperature limiting duty.
WARNING: Users should install adequate
Principle of Operation – Control action of these thermostats is provided 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.
WARNING: Not for use in hazardous environments as described in National Electrical Code. Failure to com- ply can result in explosion or fire.
LO Setting is positive open (black to red) for heating loads and is positive closed (black to blue) for cooling loads.
Note: It is not recommended to switch systems directly from heat- ing to cooling and vice versa.
© 2010 Chromalox, Inc.
