Chapter 4 System Power-On Commissioning 41
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Figure 4-3 MCBs location of three-bay unit
4.2 Power-On Commissioning Of Air-Cooled Series
4.2.1 Preparation Before Commissioning
Mechanical part
1. The protection materials for transportation have been removed. Check that the motor pulley and the fan pulley of the
FC fan model 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 correct. For the upflow unit, especially note that the transportation fixing bolts of the fan
have been removed. For the downflow unit of EC fan, make sure that that fan has been lowered into position, no
foreign matter inside the air channel, and the protective guards are installed correctly.
2. The cooling pipe system has passed the pressure leakage test.
3. The total charge quantity has been roughly calculated. If the charge exceeds the base charge allowed, additional
refrigerant oil should have been added into the system.
4. The water supply and drain pipes of the humidification system have been connected, the material requirement is
met and the leakage detection has been installed.
5. The crankcase heater of the compressor has been preheated for over 12hr.
6. The chilled water system has passed the pressure leakage test, and is qualified.
7. The chilled water system has been cleaned and discharged (air bleed valve is on top of the cooling coil header).
8. The chilled water system has been confirmed ready for operation.
9. The equipment room is above 20°C with certain heat load. Otherwise, pre-heat the equipment room with any
heating device, or by manual 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.
10. During low ambient conditions, it may be necessary to manually raise the condensing pressure up to 16bar by
manually shielding some condensing area to limit condensing air volume.
Electric part
1. Check that the voltage of the main power supply is within ±10% of the rating, and the isolation switch of the
air-cooled condenser of the outdoor unit has been closed.
2. Check that all power and control circuits are properly connected. Fasten all connection connectors.
3. Separate any power cables and the low voltage control cables from each other.
4. Check that the transportation foam block of the infrared humidifier has been removed, and the high water level
cables have been connected and its float mechanism operates correctly.
5. Check the phase sequence:
1) For the FC fan model, the phase sequences of all three-phase devices have been adjusted consistent before
delivery. During commissioning, you only need to ensure that the phase sequence of a random three-phase device is
correct. In step two of
4.2.2 Commissioning Procedures
, if you run the fan by clicking on the fan contactor in the
electric control box with a
straight screwdriver,
you can judge the phase sequence by observing the wind direction. If
the phase sequence is wrong, exchange any two phases of the L line of the power supply.
Liebert.PEX2 Series Air Conditioner User Manual
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