28 Chapter 5 System Power-On Commissioning
Liebert.CRV+ Series Air Cooled Precision Air Conditioner User Manual
Chapter 5 System Power-On Commissioning
This chapter introduces the system power-on commissioning, including location of MCBs, power-on commissioning of
air-cooled series unit.
5.1 Location Of MCBs
The MCB locations of Liebert.CRV+ series unit are shown in Figure 5-1. For the MCB distribution in different unit
electrical control box, please refer to the actual label on the cabinet for distinguishing.
CR025 unit MCB sequence
3 4 521
A
m
p
l
i
f
i
e
d
Amplified
CR025:
1: Compressor MCB
2: Electrical heater MCB
3: Transformer MCB
4: Fan MCB
5: Humidifier MCB
CR035:
1: Compressor MCB
2: Fan MCB
3: Electrical heater MCB
4: Transformer MCB
5: Humidifier MCB
3 4 521
CR035 unit MCB sequence
Figure 5-1 MCB locations of the unit
5.2 Power-On Commissioning
5.2.1 Preparation Before Commissioning
Mechanical part
1. According to the indicating label on the valve, open all valves in the refrigerant loop.
2. The cooling pipe system has past the pressure leakage test.
3. Ensure that the refrigerant has been correctly charged.
4. The total charge quantity has been roughly calculated. If the required charge quantity exceeds the standard one,
the rated amount of refrigerant oil should have been refilled into the system. Refer to 3.4.6 Charging Refrigerant
And Adding Refrigeration Oil.
5. The water supply and drainage pipes of the humidification system have been reliably connected, the material
requirement is met and the leakage detection has been done.
6. The heating tape of the compressor has been preheated for over 12 hours.
7. The equipment room is above 18°C 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
step three of 5.2.2 Commissioning Procedures) and of other equipment in the room. Ensure sufficient heat load for
the commissioning.
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