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CAUTION
CAUTION
Do not use the existing refrigerant piping
• The old refrigerant and refrigerator oil in the existing
piping contain a large amount of chlorine, which will
cause the refrigerator oil in the new unit to deteriorate.
• R32 is a high-pressure refrigerant, and the use of
the existing piping may result in bursting.
• Store the piping to be used during installation
indoors, and keep both ends of the piping sealed until
immediately before brazing.(keep elbows and other
joints wrapped in plastic.)
• If dust, dirt, or water enters the refrigerant cycle, it
may cause the oil in the unit to deteriorate or may
cause the compressor to malfunction.
Use a small amount of ester oil, ether oil, or
alkylbenzene to coat ares and ange connections.
• A large amount of mineral oil will cause the
refrigerating machine oil to deteriorate.
Use liquid refrigerant to charge the system.
• Charge the unit with gas refrigerant will cause the
refrigerant in the cylinder to change its composition
and will lead to a drop in performance
Keep the inner and outer surfaces of the pipes clean
and free of contaminants such as sulfurm, oxides,
dust/dirt shaving particles, oils, and moisture.
• Contaminants inside the refrigerant piping will cause
the refrigerant oil to deteriorate.
Precautions for Handling Units for Use with R32
Use a vacuum pump with a reverse-ow check valve.
• If other types of valves are used, the vacuum pump
oil will ow back into the refrigerant cycle and cause
the refrigerator oil to deteriorate.
Do not use the following tools that have been used
with the conventional refrigerants. Prepare tools that
are for exclusive use with R32.
(Gauge manifold, charging hose, gas leak detector,
reverse-ow check valve, refrigerant charge
base,vacuum gauge, and refrigerant recovery
equipment.)
• If refrigerant and/or refrigerant oil left on these tools
are mixed in with R32, or if water is mixed with R32,
it will cause the refrigerant to deteriorate.
• Since R32 does not contain chlorine, gas-leak
detectors for conventional refrigerators will not work.
Do not use a charging cylinder.
• The use of charging cylinder will change the
composition of the refrigerant and lead to power loss.
Exercise special care when handling the tools.
• An introduction of foreign objects such as dust,
dirt or water into the refrigerant cycle will cause the
refrigerating machine oil to deteriorate.
Only use R32 refrigerant.
• The use of refrigerants containing chlorine(i.e. R22)
will cause the refrigerant to deteriorate.
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