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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 unit and
outdoor unit should be minimized.
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The piping length between the outdoor unit and the indoor unit may not exceed the allowable piping length, height
difference, and the allowable length after branching is done.
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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 pipe installation, charge the refrigerant according to the length of the pipe and R-410A refrigerant should be used.
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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.
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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. It may cause explosion and injury.
WARNING
Tool
Work
If compatible with conventional tool
Pipe cutter
Refrigerant pipe work
Pipe cutting
Compatible
Flaring tool
Pipe flaring
Refrigerant 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 tightening test
Inhibition of oxidization
Brazing tool
Pipe brazing
Manifold gauge
Air tightening test ~
additional refrigerant
charging
Vacuuming, charging and
checking operation
Need exclusive one to prevent mixture of R-22
refrigerant oil use and also the measurement is
not available due to the high pressure.
Refrigerant charging
hose
Need exclusive one due to the refrigerant
leakage or inflow of impurities.
Vacuum pump
Vacuum 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.-755mmHg).
Scale for refrigerant
charging
Charging refrigerant
Compatible
Gas leak detector
Gas leak test
Need exclusive one
( The one for R-134a can be used)
Flare nut
You must use the flare nut equipped with product.
Refrigerant leakage may occur when the conventional flare nut for R-22 is used.
