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Alarms
Liebert
®
Mini-Mate2
™
54
8.1.7 Loss of Power
The Loss of Power Alarm will activate (after power is restored to the unit) if the unit has lost power or
the disconnect switch was incorrectly turned off before the unit ON/OFF switch was pressed. A
Liebert remote monitoring unit (optional) will immediately indicate loss of power.
8.1.8 Short Cycle
A Short Cycle Alarm will occur if the compressor system has exceeded 10 cooling start attempts in a
one-hour period. This can be caused by low refrigerant level or room cooling load is small compared to
capacity of the unit. Check for leaks, crimped lines and defective components. If room load is low,
increase temperature sensitivity to reduce cycle.
8.2 Optional/Custom Alarms
8.2.1 Change Filter
Periodically, the return air filters in the evaporator must be changed. The Change Filter alarm
notifies 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.
8.2.2 High Temperature Sensor
The optional high temperature sensor 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.
8.2.3 Smoke Sensor
The optional smoke sensor constantly samples return air through a tube. Its power supply is located
in the electric panel. The smoke sensor shuts down the unit upon detecting smoke, and activates
visual and audible alarms. This smoke sensor is not intended to function as or replace any room
smoke detection system that may be required by local or national codes. Locate the source of the
smoke and follow appropriate emergency procedures.