Manual At Compressor Overall Check And Parts Check; Refrigeration Cycle Complete Parts; Reference Materials; Collection Of Refrigerant - Hitachi RCUE40AG2 Service Manual

Maintenance

6.6.3. Refrigeration cycle complete parts

Organic materials (rubber, tefl on) used in compressor and control device use compatible parts with Freol
UX300 and R407C.
The pressure of R407C is higher than that of R22, and pressure strength of devices is increased. Therefore,
devices for R407C are not compatible with that for R22. Use specifi ed devices when replacing the
compressor and refrigeration cycle parts at maintenance.
Do not put R407C to the units for R22 .

6.6.4. Reference materials

The following materials are published as a reference for R407C handling. Please see for them.
Implementation, service and maintenance of Package Air conditionings with R407C. (material No.: HR-
−
325)
Implantation and service technique of devices used HFC series (JRAIA)
−

6.7. Manual at compressor overall check and parts check

6.7. Manual at compressor overall check and parts check

6.7. Manual at compressor overall check and parts check
The refrigerant (R407C) used in this unit is HFC refrigerant and does not cause the destruction of ozone layer in
contrast with CFC or HCFC refrigerant.
However, its global heating coeffi cient is the same level as HCFC refrigerant, therefore it is important to control the
discharge. Also, it is necessary to collect refrigerant at disposal of device or at arrangement of devices.
Collection of refrigerant, vacuuming and additional insertion of refrigerant at compressor overall check and parts
check are shown in the following.
Handling of R407C alternative refrigerant is described in "Implantation / Service Technical of Devices used HFC
Refrigerant".

6.7.1. Collection of refrigerant

Refrigerant at airside heat exchanger should be collected in case of compressor overall check and parts
check. However, at replacement or arrangement of airside heat exchanger itself, valve and fusible plug
of airside heat exchanger, refrigerant of airside heat exchanger and other high pressure parts cannot be
collected, and refrigerant inside the refrigeration cycle is needed to be collected using refrigerant collection
device.
1. Liquid outlet valve (A) of airside heat exchanger is fully closed.
2. Chiller unit is operated with chilled water fully fl owing
operated in cooling mode)
3. Chiller unit is stopped when pressure of low pressure side is decreased to aprox. 0.05MPa. Do NOT
operate Chiller unit under 0.05MPa. Such operation may cause a compressor failure.
4. After a few minutes later when pressure of low pressure side is increased to 0.45~0.5MPa, chiller
unit is re-operated and (2) and (3) are repeated 4~5 times.
5. This above operation enables the major part of refrigeration cycle to be collected in airside heat
exchanger and high pressure pipe (between (B) and (A)).
6. Refrigerant, remained in low pressure side pipe and water cooling device, should be collected from
stop valve (D) using refrigerant collection device.
pag. 162
SMGB0003 rev.0 - 11/2006
with chilled water fully fl owing. (In case of air-cooled heat pump type it is