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Caution
Precautions for Devices that Use R407C Refrigerant
Do not use existing refrigerant piping.
• The old refrigerant and refrigerator oil in the existing piping
contain a large amount of chlorine, which will deteriorate
the refrigerator oil in the new unit.
Use refrigerant pipes made of C1220 phosphorus
deoxidized copper categorized under H3000 (Copper and
Copper Alloy Seamless Pipes and Tubes), a standard set
by JIS.
• Keep inner and outer surfaces of the pipes clean and free
of contaminants, such as sulfur, oxides, dust/dirt, shaving
particles, oils, and moisture. Contaminants inside the
refrigerant piping will deteriorate the refrigerant oil.
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 circuit,
deterioration of the oil or compressor problems may result.
Use a small amount of ester oil, ether oil, or alkylbenzene
to coat flares and flange connections.
• Refrigerator oil will deteriorate if it is mixed with a large
amount of mineral oil.
Be especially careful when managing tools.
• Exercise caution so that tools do not introduce dust, dirt,
and water into the refrigerant cycle.
Use liquid refrigerant to charge the circuit.
• Charging the unit with gas refrigerant will cause the
refrigerant in the cylinder to change its composition and will
lead to a drop in performance.
Only use R407C refrigerant.
• The use of other refrigerants containing chlorine (i.e. R22)
will deteriorate the refrigerant.
Do not use the following tools that have been used with
the existing refrigerators.
(Gauge manifold, charge hose, gas-leak detector, reverse-
flow-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 R407 or if water is mixed with R407C
refrigerant, the refrigerant will deteriorate.
• Since R407C 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.
Use a vacuum pump with a reverse-flow-check valve.
• If other types of valves are used, the vacuum pump oil will
flow back into the refrigerant circuit and deteriorate the
refrigerator oil.
