Emerson MINI-MATE2 8.1.7Loss of Power, 8.1.8Short Cycle, 8.2.1Change Filter, 8.2.3Smoke Sensor

Alarms

8.1.7Loss 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.

8.1.8Short 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.

8.2Optional/Custom Alarms

8.2.1Change 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.

8.2.2High 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.

8.2.3Smoke 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.

Liebert® Mini-Mate2™ 54