17
AA
ENGLISH
The length of refrigerant pipe should be as short as possible and the height difference between an indoor and outdoor
unit should be minimized.
Piping work must be done within allowable piping length, height difference, and the allowable length after branching.
The pressure of the R-410A is high. Use only certied refrigerant pipe and follow the installation method.
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.
Use clean refrigerant pipe and there shouldn’t be any harmful ion, oxide, dust, iron content or moisture inside pipe.
Use tools and accessories that t on R-410A only.
Tools
Installation process/purpose Compatibility with conventional tool
Pipe cutter
Refrigerant pipe installation
Pipe cutting
Compatible
Flaring tool Pipe aring
Refrigerant
machine oil
Apply refrigerant oil on
ared part
Exclusive ether oil, ester oil, alkali
benzene oil or synthetic oil
Torque wrench
Connect are 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
Vacuumizing, refrigerant
filling as well as inspecting
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 inow of impurities
Vacuum pump
Pipe drying
Compatible (Use products which contain the check valve to prevent
the oil from owing backward into the outdoor unit.) Use the one
that can be vacuumed up to -100.7kpa(5Torr).
Electronic scale for
refrigerant filling
Compatible
Air leak tester
Gas leak test
Need exclusive one
(Ones used for R-134a is compatible)
Pipeline joint
Must use the are nut equipped with the product. Refrigerant leakage may occur
when the conventional are nut for R-22 is used.
Warning
• When installing, make sure there is no leakage. When collecting the refrigerant, stop the compressor rst
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.
Installation of Air-conditioner
Refrigerant pipe work
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