Chapter 4 System Testing; Start-Up Inspection; Function Testing; Cooling - Liebert DM Series User Manual

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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.
Item
Panel
Filter
Power supply
Outdoor unit
Fan
Humidifier (if applicable)
Heater (if applicable)
Power SPD (if applicable)
Controller
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.
Item
Fan
Heater (if applicable)
Outdoor fan
Others

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
Chapter 4 System Testing
Table 4-1 Inspection items before starting-up
No damage, well insulated and clean
Installed in place and reliably, no damage and clean
Measure and record the voltage before the system is powered on. Power cables are connected
reliably
The outdoor unit is installed reasonably; the pipes are supported and sloped down properly; the
trap is installed in a correct position
No obstruction material in inlet and outlet area
Water supply pipe and drain pipe are connected; water level sensor is secured correctly
Heating components are secured reliably
The module is secured reliably
The wiring connections are tight
Table 4-2 Inspection items after starting-up
The rotation direction is correct; record the rated full load current and actual current of the fan motor
Record the heater current
The rotation direction is correct; record the rated full load current and actual current of the fan motor
Record the user setpoints, return air temperature, suction pressure, discharge pressure,
compressor current and discharge air temperature
New Liebert_DM Series Air Conditioner User Manual
Inspection requirements
Inspection requirements