Primary Heat Sensor
The primary heat sensor is located on back wall of the valve compartment next to the smoke sensor. It
should be visible on the wall opposite the compressed air reservoir when being viewed from the access panel. For indoor units, the sensor is activated if the temperature reaches 135 o F. For outdoor units, the sensor is activated if the temperature reaches 190 o F. It can be tested using a heat gun directed towards
the sensor
To reset the primary heat sensor, the power must be turned off and the sensor must be allowed to cool.
The internal program of the controller latches shut electronically, forcing the power to be cycled off and
then on. If the primary heat has been activated, the Heat Detector 1 indicator will light up.
Copyright © Clean Air Industries , Inc.
Liberty WeldCell User Manual, August 2023
Page 29 of 66
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