Short Cycle; Optional/Custom Alarms; Change Filter; High Temperature Sensor - Liebert Mini-Mate2 MMD24E User Manual

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 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 feature is a bimetal 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 Detected

The smoke detector senses the return air, shuts down the unit upon detection and sends visual and
audible alarm. This smoke detector is not intended to function as or replace any room smoke detection
system that may be required by local or national codes. Locate source of smoke and follow appropriate
emergency procedures.
® ™
Liebert Mini-Mate2 58
Alarms