Secondary Heat Sensor
The heat sensor is located on back wall of the filter compartment. This is the divider panel between the
filter compartment and the motor/valve compartments. It should be visible between the first and second
rows of filters without removing the filters. 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.
If airflow is present the heat sensors and smoke sensors in the valve compartment will be activated
sooner. A signal is sent to the controller to activate the rest of the fire suppression system.
To reset the secondary 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 2 indicator will light up.
Copyright © Clean Air Industries , Inc.
Liberty WeldCell User Manual, August 2023
Page 30 of 66
Made with FlippingBook - PDF hosting