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 display will show “Heat2” as shown in the picture below.
Heat Detection Tubing
Heat Detection Tubing is a new fire detection system implemented by Clean Air Industries since January 2020. The tubing runs along the wall in the filter compartment. When temperature reaches 375 o F, the
tube bursts and immediately releases the fire suppression agent. The heat detection tubing is
implemented to allow the system to release the fire suppression agent even during power loss. The heat
detection tubing comes with pressure switch to monitor whether the fire suppression agent has been
released.
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