Liebert DM Series User Manual

24 Chapter 4 System Testing
New Liebert_DM Series Air Conditioner User Manual
Chapter 4 System Testing
This chapter introduces the start-up inspection and function testing of the Liebert_DM AC.
4.1 Start-Up Inspection
Before system starting-up, inspect the states of parts following the requirements listed in Table 4-1.
Table 4-1 Inspection items before starting-up
Item
Inspection requirements
Panel
No damage, well insulated and clean
Filter
Installed in place and reliably, no damage and clean
Power supply
Measure and record the voltage before the system is powered on. Power cables are connected
reliably
Outdoor unit
The outdoor unit is installed reasonably; the pipes are supported and sloped down properly; the
trap is installed in a correct position
Fan
No obstruction material in inlet and outlet area
Humidifier (if applicable)
Water supply pipe and drain pipe are connected; water level sensor is secured correctly
Heater (if applicable)
Heating components are secured reliably
Power SPD (if applicable)
The module is secured reliably
Controller
The wiring connections are tight
After inspecting and confirming the above items, you can power on the AC unit. The inspection requirements after
starting-up are listed in Table 4-2.
Table 4-2 Inspection items after starting-up
Item
Inspection requirements
Fan
The rotation direction is correct; record the rated full load current and actual current of the fan motor
Heater (if applicable)
Record the heater current
Outdoor fan
The rotation direction is correct; record the rated full load current and actual current of the fan motor
Others
Record the user setpoints, return air temperature, suction pressure, discharge pressure,
compressor current and discharge air temperature
4.2 Function Testing
 Note
The AC unit carries hazardous voltage. Cut off the power before testing the equipment. Test should be done under the guidance of
Emerson professional maintenance personnel or trained maintenance personnel.
4.2.1 Cooling
Adjust the temperature setpoint according to 5.6.3 Set Points to 5°C (10°F) lower than the indoor temperature. Then
the control system should trigger the cooling demand and the compressor starts to work. After at least 3min of cooling,
adjust the temperature setpoint to 5°C (10°F) higher than the indoor temperature. If the compressor stops working, it
means that the cooling function is normal.
 Note
Restore the temperature setpoint to the default or the original value after the test.
4.2.2 Heating
Adjust the temperature setpoint according to 5.6.3 Set Points to 5°C (10°F) higher than the indoor temperature.
Then the control system should trigger the heating demand and the heater starts to work. Adjust the temperature

Liebert DM Series Specifications

General

Brand	Liebert
Model	DM Series
Category	Air Conditioner
Language	English