Haier CA0035EAND Service Manual page 43

7. The refrigerant is completely leak
If this happens, the system must use high-pressure nitrogen (15 to 20 kg pressure) or refrigerant leak detection,
such as the need for welding can be welded must be drained of gas within the system before the refrigerant
charge the entire cooling system must be completely dry and vacuum.
1) The suction side of the compressor and the tank side connection Fluoridated mouth vacuuming while ensuring
that all of the electromagnetic valve in a power state that is open.
2) Use a vacuum pump vacuum system piping, confirm whether the meter refers -1.0 × 105Pa (-76cmHg).
3) To achieve the required degree of vacuum, refrigerant bottle charging refrigerant to a refrigeration system, an
appropriate amount of refrigerant charge on the nameplate and main technical parameters have been stated.
Refrigerant charge of the system must be low-pressure pipe side, while opening the pump cycle, avoid the
cracking of heat transfer tubes. .
4) The amount of refrigerant charge is affected by ambient temperature, if the charge amount does not meet the
requirements, you can make frozen water cycle, and start the unit were filled, if necessary, the pressure switch
temporarily shorted.
Note:
After filling end must restore wiring.
8. Add refrigerant
Fluoridated mouth in the low pressure side of the refrigerant charge connection bottle, and the low pressure side
connection pressure gauge.
The water side of the cycle, and start the unit, if necessary, pressure switch shorted.
Slow charging refrigerant into the system and check the suction and discharge pressure.
Warning: When performing leak detection and tightness test, do not filling oxygen, acetylene or other flammable or
toxic gases into the cooling system, use only high-pressure nitrogen or refrigerant.
9. Disassemble compressor
Such as the compressor needs to be removed, follow these steps:
1) Turn off the power supply unit.
2) Remove the compressor power cable.
3) The refrigerant recovery system.
4) Remove the compressor suction and discharge pipes.
5) Remove the compressor fixing bolt.
6) Remove the compressor.
10. The system antifreeze
If the water-side heat exchanger flow path icing conditions, would cause serious damage, appears water-side heat
exchanger rupture and leak, and the cracking damage is not covered under warranty, so the frost to special care,
for the following three Please pay special attention to the user:
If the unit on the outside temperature is below 0°C environment should be water-side heat exchanger in the water
drained in lower ambient temperatures down back.
Runtime may result in runtime if the chilled water flow switch and antifreeze temperature sensor failure pipes
freeze and, therefore, the flow switch must be wired according to the wiring diagram.
When maintenance to the unit refrigerant charge or for maintenance and let go of the refrigerant, it is possible the
cracking water-side heat exchanger.
Whenever the pressure vessel at 0.68MPa or less refrigerant, piping icing is likely to occur, therefore, make sure
to keep the heat exchanger water flow or put a clean water thoroughly.
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