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ENGLISH
Refrigerant pipe installation
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When installing, make sure there is no leakage. When collecting the refrigerant, stop the compressor first before
removing the connection pipe. If the refrigerant pipe is not properly connected and the compressor works
with the service valve open, the pipe inhales the air and it makes the pressure inside of the refrigerant cycle
abnormally high which may lead to explosion and injury.
WARNING
Refrigerant pipe work
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The length of refrigerant pipe should be as short as possible and the height difference between an indoor and outdoor
unit should be minimized.
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Piping work must be done within allowable piping length, height difference, and the allowable length after branching.
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The pressure of the R-410A is high. Use only certified refrigerant pipe and follow the installation method.
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After installing the pipes, calculate the total length of the pipe to check if additional refrigerant is needed. When you need
to charge the additional refrigerant, make sure to use R-410A refrigerant.
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Use clean refrigerant pipe and there shouldn’t be any harmful ion, oxide, dust, iron content or moisture inside pipe.
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Use tools and accessories that fit on R-410A only.
Tool
Installation process/purpose
Compatibility with conventional tool
Pipe cutter
Refrigerant pipe
installation
Pipe cutting
Compatible
Flaring tool
Pipe flaring
Refrigerant
machine oil
Apply refrigerant
oil on flared part
Exclusive ether oil, ester oil, alkali benzene oil or synthetic oil
Torque wrench
Connect flare nut
with pipe
Compatible
Pipe bender
Pipe bending
Nitrogen gas
Air tightness test
Prevent oxidation
within the pipe
Welder
Pipe welding
Manifold gage
Air tightness
test ~ additional
refrigerant
charging
Vacuuming,
charging
refrigerant
and checking
operation
Need exclusive one to prevent mixture of R-22 refrigerant oil use and
also the measurement is not available due to high pressure
Refrigerant
charging hose
Need exclusive one since there is risk of refrigerant leakage or inflow
of impurities
Vacuum pump
Pipe drying
Compatible (Use products which contain the check valve to prevent
the oil from flowing backward into the outdoor unit.) Use the one
that can be vacuumed up to -100.7kpa(5Torr).
Scale for
refrigerant
charging
Charging refrigerant
Compatible
Gas leak detector
Gas leak test
Need exclusive one
(Ones used for R-134a is compatible)
Flare nut
Must use the flare nut equipped with the product. Refrigerant leakage may occur when the conventional flare
nut for R-22 is used.
