Guidelines When Connecting The Refrigerant Piping - Daikin RXM20A5V1B Installer's Reference Manual

7 | Piping installation

7.2.3 Guidelines when connecting the refrigerant piping

Installer reference guide
36
NOTICE
Take the following precautions on refrigerant piping into account:
▪
Avoid anything but the designated refrigerant to get mixed into the refrigerant
cycle (e.g. air).
▪
Only use R32 when adding refrigerant.
▪
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.
▪
Install the piping so that the flare is NOT subjected to mechanical stress.
▪
Do NOT leave pipes unattended at the site. If the installation is NOT done within 1
day, 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).
▪
Avoid contact of the pipe with the wall to prevent transmitting vibrations and
sounds to the house.
Unit
Outdoor unit >1 month
<1 month
Indoor unit Regardless of the period
NOTICE
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.
Take the following guidelines into account when connecting pipes:
▪ Coat the flare inner surface with refrigerant oil for R32 (FW68DA) when
connecting a flare nut. Tighten 3 or 4 turns by hand, before tightening firmly.
▪ ALWAYS use 2 wrenches together when loosening a flare nut.
▪ ALWAYS use a spanner and torque wrench together to tighten the flare nut when
connecting the piping. This to prevent nut cracking and leaks.
Installation period Protection method
Pinch the pipe
Pinch or tape the pipe
RXM-A, ARXM-A
R32 split series
4P718129-3A – 2023.07