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10. Installation
140
Refrigerant pipe installation
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 oxida-
tion within the
pipe
Welder
Pipe welding
Manifold gage
Air tightness
test ~ addi-
tional refrigerant
charging
Vacuuming,
charging refrig-
erant and check-
ing 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 refrig-
erant charging
Refrigerant charging
Compatible
Gas leak detec-
tor
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 conven-
tional flare nut for R-22 is used.