11 SYSTEM OPERATION, TESTING AND MAINTENANCE
This section describes system testing, maintenance and replacement procedures. Use copies of the
Maintenance Inspection Checklist to record preventive maintenance inspections.
WARNING! Risk of electric shock. Can cause injury or death. Open all local and remote electric
power disconnect switches before working within the electrical enclosures. The Liebert
microprocessor control does not isolate power from the unit in the Unit Off mode. Some
internal components require and receive power even during the Unit Off mode. The line side of
the disconnect switch on the front of the unit contains live high voltage. The only way to
ensure that there is NO voltage inside the unit is to install and open a remote disconnect switch
and check the internal power supply wires with a voltmeter.
11.1 System Testing
11.1.1 Environmental Control Functions
The performance of all control circuits can be tested by changing the set points, which activates each of
the main functions.
11.1.2 Cooling
To test the cooling function, set the set point to a temperature of 10°F (5°C) below room temperature. A
call for cooling should register and prompt the equipment to begin cooling cycle. (Disregard any
temperature alarms). Upon completion of testing, return set point to the desired temperature.
11.1.3 Heating
Reheat may be tested by setting the set point 10°F (5°C) above room temperature. A call for heating
should register and prompt the equipment to begin heating cycle. (Disregard any temperature alarms).
Upon completion of testing, return set point to the desired temperature.
11.1.4 Humidification
To check humidification, set the humidity set point at R.H. 10% above the room humidity reading. After a
short delay, the canister will fill with water and steam will be produced. Upon completion of testing, return
the humidity set point to the desired humidity.
11.1.5 Dehumidification
The dehumidification performance can be tested by setting the humidity set point at R.H. 10% below room
relative humidity. The compressor should turn on. Upon completion of testing, return humidity set point
to the desired humidity.
11.1.6 Remote Shutdown
A connection point is provided for remote shutdown devices supplied by the customer. This terminal strip
is located on the printed circuit board. (Terminals TB1-4 and TB1-5 are fitted with a jumper when no
remote shutdown device is installed).
Vertiv | Liebert Mini-Mate2—5 ton User Manual| 75
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