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Piping installation
Installer reference guide
33
35M5V1B_35M5V1B
Daikin room air conditioner
4P519439-13N – 2021.03
CAUTION
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Use the flare nut fixed to the 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.
CAUTION
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Do NOT use mineral oil on flared part.
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Do NOT reuse piping from previous installations.
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NEVER install a drier to this R32 unit to guarantee its lifetime. The drying material
may dissolve and damage the system.
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.
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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
7.2.3 Guidelines when connecting the refrigerant piping
Take the following guidelines into account when connecting pipes:
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Coat the flare inner surface with ether oil or ester oil when connecting a flare
nut. Tighten 3 or 4 turns by hand, before tightening firmly.
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ALWAYS use 2 wrenches together when loosening a flare nut.
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ALWAYS use a spanner and torque wrench together to tighten the flare nut when
connecting the piping. This to prevent nut cracking and leaks.
