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5.2 Optional/Custom Alarms
5.2.1 Change Filter
Periodically, the return air filters in the evaporator must be changed. The Change Filter alarm noti-
fies the user that filter replacement is necessary. A differential air pressure switch closes when the
pressure drop across the filters becomes excessive. The switch is adjustable using the procedure on
the switch label.
5.2.2 Firestat
The optional firestat feature is a bi-metal operated sensing device with a closed switch under normal
conditions. Connected between pins 1-8 and 1-9, this device will shut down the entire unit.
5.2.3 Smoke Detector
The smoke detector is located in the unit, the optional smoke detector power supply is located in the
electric panel. It constantly samples return air through a tube. No adjustments are required.