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Piping installation
Installer reference guide
36
2(A)MXM40+50 + 2(A)MXF40+50
R32 Split series
4P600463-3D – 2021.03
CAUTION
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Use the flare nut fixed to the main unit.
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To prevent gas leakage, apply refrigeration oil only to the inside of the flare. Use
refrigeration oil for R32.
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Do NOT reuse joints.
NOTICE
Take the following precautions on refrigerant piping into account:
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Avoid anything but the designated refrigerant to get mixed into the refrigerant
cycle (e.g. air).
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Only use R32 when adding refrigerant.
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Only use installation tools (e.g. manifold gauge set) that are exclusively used for
R32 installations to withstand the pressure and to prevent foreign materials (e.g.
mineral oils and moisture) from mixing into the system.
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Install the piping so that the flare is NOT subjected to mechanical stress.
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Protect the piping as described in the following table to prevent dirt, liquid or
dust from entering the piping.
▪
Use caution when passing copper tubes through walls (see figure below).
Unit
Installation period
Protection method
Outdoor unit
>1 month
Pinch the pipe
<1 month
Pinch or tape the pipe
Indoor unit
Regardless of the period
INFORMATION
Do NOT open the refrigerant stop valve before checking the refrigerant piping. When
you need to charge additional refrigerant it is recommended to open the refrigerant
stop valve after charging.
WARNING
Connect the refrigerant piping securely before running the compressor. If the
refrigerant piping is NOT connected and the stop valve is open when the compressor
is run, air will be sucked in. This will cause abnormal pressure in the refrigeration
cycle, which may result in equipment damage and even injury.
NOTICE
Even if the stop valve is fully closed, the refrigerant may slowly leak out. Do NOT
leave the flare nut removed for long period of time.
7.2.3 Guidelines when connecting the refrigerant piping
Take the following guidelines into account when connecting pipes:
