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Precautions for devices that use HCFC and HFC refrigerants
Caution:
Do not use the existing refrigerant piping.
The old refrigerant and refrigerator oil in the existing piping contains a large amount of chlorine which may cause
the refrigerator oil of the new unit to deteriorate. Use refrigerant piping made of C1220 (CU-DHP) phosphorus
deoxidized copper as specified in the JIS H3300" Copper and copper alloy seamless pipes and tubes". In addition,
be sure that the inner and outer surfaces of the pipes are clean and free of hazardous sulphur, oxides, dust/dirt,
shaving particles, oils, moisture, or any other contaminant.
Contaminants on the inside of the refrigerant piping may cause the refrigerant residual oil to deteriorate.
Store the piping to be used during installation indoors and keep both ends of the piping sealed until just before
brazing.
(Store elbows and other joints in a plastic bag.) If dust, dirt, or water enters the refrigerant cycle, deterioration of
the oil and compressor problems may result.
Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil to coat flares and flange connections.
The refrigerator oil will degrade if it is mixed with a large amount of mineral oil.
Use liquid refrigerant to fill the system.
If gas refrigerant is used to seal the system, the composition of the refrigerant in the cylinder will change and
performance may drop.
Do not use a refrigerant other than what is specified..
If the incorrect refrigerant (R22, etc.) is used, the chlorine in the refrigerant may cause the refrigerator oil to
deteriorate.
Use a vacuum pump with a reverse flow check valve.
The vacuum pump oil may flow back into the refrigerant cycle and cause the refrigerator oil to deteriorate.
Do not use the following tools that are used with conventional refrigerants. (Gauge manifold, charge hose, gas leak
detector, reverse flow check valve, refrigerant charge base, vacuum gauge, refrigerant recovery equipment.)
If the conventional refrigerant and refrigerator oil are mixed, the refrigerant may deteriorate.
If water is mixed in the refrigerant, the refrigerator oil may deteriorate.
Since HCFC and HFC refrigerants do not contain any chlorine, gas leak detectors for conventional refrigerants will
not react to it.
Do not use a charging cylinder. Using a charging cylinder may cause the refrigerant to deteriorate.
Be especially careful when managing the tools.
If dust, dirt, or water gets in the refrigerant cycle, the refrigerant may deteriorate.
KSGD-01WS-B
Installation and operation manual
KSGD02 Revision: 1.4
Page 5 of 16
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