Removal And Installation

EXPANSION VALVE

Removal and Installation


CAUTION:
Perform lubricant return operation before each refrigeration system disassembly. However, if a large amount of refrigerant or lubricant is detected, never perform lubricant return operation. Refer to HA34, "Perform Lubricant Return Operation".

REMOVAL

1.Use the refrigerant recovery equipment (for HFC134a) and recover the refrigerant. Refer to "Recycle Refrigerant" Recycle Refrigerant.





2.Remove mounting bolt (A), and then disconnect low-pressure flexible hose (1) and high-pressure pipe (2) from expansion valve.

CAUTION:
To prevent the inclusion of foreign matter, use a cap or vinyl tape to seal off the connection ports of the pipe and expansion valve from the atmosphere.





3.Remove mounting bolts (A), and then remove expansion valve (1).

CAUTION:
To prevent the inclusion of foreign matter, use a cap or vinyl tape to seal off the connection ports of the expansion valve and evaporator from the atmosphere.

INSTALLATION

Note the following items, and then install in the reverse order of removal.

CAUTION:
- To prevent degradation in insulation performance, use special electric compressor oil as the compressor oil.
- In order to prevent conventional PAG oil from becoming mixed in, never reuse recovered compressor oil and instead always use new oil. The use of oil including the conventional PAG oil may degrade the performance of insulation.
- To prevent performance degradation, never use a fluorescent agent in order to detect refrigerant leakage. Also be careful that a fluorescent agent never enter the oil.
- To prevent leakage of refrigerant, replace the O-ring with a new one. Apply a coat of compressor oil to the O-ring prior to installation.
- Perform a check for refrigerant leakage when charging with refrigerant. Refer to "Check Refrigerant Leakage" Check Refrigerant Leakage.