Chapter 4 System Start-Up And Commissioning; Location Of Mcbs; Power-On Commissioning; Preparation Before Commissioning - Liebert DM User Manual

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Chapter 4 System Start-up And Commissioning

Chapter 4 System Start-Up And Commissioning
This chapter introduces the power-on commissioning and function test of air-cooled series and water-cooled series,
including the preparation before commissioning and commissioning procedures.

4.1 Location Of MCBs

The MCBs are located as shown in Figure 4-1.
1: Compressor MCB
2: Fan MCB

4.2 Power-on Commissioning

4.2.1 Preparation Before Commissioning

Mechanical part
1. Check that the protection materials for transportation have been removed. For the upflow series unit, check that the
transportation bolts of the fan have been removed; check that the motor pulley and the fan pulley are fixed, the motor
bearing and fan bearing are parallel, the belt is perpendicular to the two bearings and the tension of the belt is proper.
2. The cooling pipe system has past the pressure leak test.
3. The total charge has been roughly calculated. If the pipe is too long, the rated amount of refrigerant oil should have
been charged into the system.
4. The water supply & drain pipe-system of the humidification system has been reliably connected, the material
requirement is met and the leak detection has been done.
5. The heating tape of the compressor has been preheated for over 12hr.
6. Make sure the equipment room is above 20℃ with certain heat load. Otherwise, pre-heat the equipment room with
any heating device, or by forcedly running the heaters of the unit (in this case, go through the following procedures till
the third entry of 4.2.2 Commissioning Procedures first) and of other equipment in the room. Ensure sufficient heat
load for the commissioning.
7. In the winter, it may be necessary to manually raise the condensing pressure to 16Bar by manually shielding some
condensing area and limiting condensing air quantity.
Electric part
1. Check that the voltage of the main power supply is within ± 10% of the rating, and that the isolation switch of the
air-cooled condenser of the outdoor unit has been closed.
2. Check that the power or control circuits are reliably connected. Fasten all the connecting terminals.
3. The power cables and the low voltage control cables are laid away from each other.
Figure 4-1 MCB of one bay system
3: Electrical heater MCB
4: Infrared humidifier MCB
DM Series 16kW Air Conditioner User Manual
6 5 4 3 2 1
6 5 4 3 2 1
5: Outdoor unit (air-cooled) MCB
6: Control board MCB
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7: Main isolation switch