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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
is working with the service valve open, the pipe sucks the air in which makes the pressure inside of the
refrigerant cycle abnormally high which may lead to explosion and injury.
CAUTION
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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The inside of the refrigerant pipe must be clean and contain no harmful ions, oxides, dust, iron particles or
moisture.
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Use tools and accessories compatible with R-410A refrigerant gas.
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 contamination
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
Compatible
Gas leak
detector
Gas leak test
Need exclusive one
(Ones used for R-134a is compatible)
Flare nut
Must use the flare nut supplied with the product. Refrigerant leakage may occur when the
conventional flare nut for R-22 is used.
10. Installation