System Testing And Maintenance; System Testing; Environmental Control Functions; Cooling - Liebert Mini-Mate2 MMD24E User Manual

9.0 S T
YSTEM ESTING AND
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.
Line side of factory disconnect remains energized when factory disconnect is Off.
9.1

System Testing

9.1.1

Environmental Control Functions

The performance of all control circuits can be tested by changing the setpoints, which actuates each of
the main functions.
9.1.2

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 setpoint to the desired temperature.
9.1.3

Heating

Reheat may be tested by setting the setpoint for 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.
9.1.4

Humidification

To check humidification, set the humidity set point at RH 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.
9.1.5

Dehumidification

The dehumidification performance can be tested by setting the humidity set point at R.H. 10% below
room relative humidity. On cooling units with direct drive motor, the compressor should turn on and
the fan should switch to low speed. Upon completion of testing, return humidity set point to the
desired humidity.
9.1.6 High Temperature Sensor—Optional
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 when the inlet air temperature exceeds a preset point.
9.1.7

Smoke Detector Sensor

While the smoke sensor is located in the unit, the optional smoke sensor power supply is located in
the electric panel. It constantly samples return air through a tube. No adjustments are required.
9.1.8

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).
M
AINTENANCE
59

System Testing and Maintenance

®
Liebert Mini-Mate2
™