44 Chapter 4 System Power-On Commissioning
4.3 Power-On Commissioning Of Water-Cooled Series
4.3.1 Preparation Before Commissioning
Mechanical and system 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 pressure test and leakage test of the cooling water system have been completed.
3. The cooling water system has been cleaned and drained.
4. The cooling water system has been confirmed ready for operation.
5. The chilled water system has past the pressure leakage test, and is qualified.
6. The chilled water system has been cleaned and discharged (air valve is on top of the heater exchanger pipe coil).
7. The chilled water system has been confirmed ready for operation.
8. The water supply and drain pipes of the humidification system have been reliably connected, the material
requirement is met and the leak detection has been done. 9. The compressor crankcase heater has been preheated
for over 12hr.
10. The equipment room temperature is above 68°F with sufficient heat load. If the heat load is insufficient, heat the
equipment room with heating devices, or by manually running other heat generating equipment to make sure that the
heat load is sufficient for the commissioning.
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 the power and control cables are properly connected. Fasten all the electric and control connection
connectors.
3. Lay the power cables and the control cables away 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 three 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.
2) For the EC fan model, the fan itself does not require phase sequence; therefore, the phase sequence needs to be
checked through compressor. After the step six static charging refrigerant of
4.2.2 Commissioning Procedures
is
completed, you should first close the connection pipe in the pressure gauge with the refrigerant filling tank, and then
use the straight screwdriver to press, so as to make one compressor contactor in the electric control box contact in
short time and start the compressor. Determine the system phase sequence through observing the high and low value
in pressure gauge that connected to the system, if the system is unable to quickly build high and low pressure, it
means the phase sequence is wrong, you should exchange any two phases of the L line of the power supply.
4.3.2 Commissioning Procedures
1. Switch off the MCBs of various components. Switch on the main isolation switch and control board MCBs. Check
the control voltage.
2. 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.
3. Switch on the fan MCB and click on the contactor of the indoor fan to confirm the fan blowing direction is correct.
Start the unit and measure all the operation phase currents of the fan.
Liebert.PEX2 Series Air Conditioner User Manual
Содержание Liebert PEX Series
Страница 1: ...User Manual ...
Страница 5: ......
