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3.2. Precautions for devices that use R410A refrigerant
CAUTION
• Do not use the existing refrigerant piping.
– The old refrigerant and refrigeration 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 addi-
tion, be sure that the inner and outer surfaces of the pipes are clean and free of hazard-
ous sulphur, oxides, dust/dirt, shaving particles, oils, moisture, or any other contami-
nants.
– 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 compres-
sor trouble may result.
• 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 R410A.
– If another refrigerant 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 refrigera-
tor 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 refrigeration oil are mixed in the R410A, the refrig-
erant may deteriorate.
– If water is mixed in the R410A, the refrigeration oil may deteriorate.
– Since R410A does not contain any chlorine, gas leak detectors for conventional refrig-
erant will not react to it.
– Do not use a charging cylinder. May cause the refrigerant to deteriorate.
• Be especially careful when managing the tools.
– If dust, dirt, or water gets in the refrigeration system, the refrigerant may deteriorate.
SVZ-KP12,18, 24, 30, 36NA
© 2022 Mitsubishi Electric US, Inc. 10 Specifications are subject to change without notice.
ENGLISH
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