Smoke Sensor
The smoke sensor is located on back wall of the valve
compartment next to the primary heat detector. It should
be visible on the wall opposite the compressed air
reservoir when being viewed from the access panel. It can
be tested by using a magnet to trip the relay inside. This is
done be rubbing the magnet over the area marked
“TEST”. Cans of smoke can be purchased as well for a
functional test.
The smoke sensor is set off by certain types of contaminants in the air found in smoke. If dust from the
filters is allowed to get into the valve compartment, this can also set off the smoke detector. Also if the
filters are misaligned, the smoke can bypass the filters and enter the valve compartment tripping the
sensor. When sensor is working properly, it will have two green flashing LEDs on the sensor head. When
the senor (smoke or heat) is tripped, both LEDs will turn red and stop flashing. If dirt or contaminant is
introduced to the sensor, it can build up and cause false trips. The sensor head must then be taken apart
and cleaned by blowing the contamination out with compressed air.
NOTE:
The heat sensor and smoke sensor use the same base. The bases are wired
identically with the exception that the normally open signal is routed to a
different location in the electrical box.
To reset the smoke sensor, the power must be turned off and the unit and sensor blown out with
compressed air to clean out any remaining smoke dust. The internal program of the controller latches
shut electronically, forcing the power to be cycled off and then on. If the smoke sensor has been
activated, the display will show “Smoke” as shown in the picture below.
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