Guidelines When Connecting The Refrigerant Piping - Daikin CVXM20A2V1B Installer's Reference Manual

7.2.3 Guidelines when connecting the refrigerant piping

CVXM20+FVXM25~50A2V1B
Split system air conditioners
4P625991-1 – 2020.06
CAUTION
▪
Use the flare nut fixed to the unit.
▪
To prevent gas leakage, apply refrigeration oil only to the inside of the flare. Use
refrigeration oil for R32.
▪
Do NOT reuse joints.
CAUTION
▪
Do NOT use mineral oil on flared part.
▪
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:
▪
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.
▪
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
Outdoor unit
Indoor unit
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.
Take the following guidelines into account when connecting pipes:
▪ 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.
Installation period
>1 month
<1 month
Regardless of the period
7 Piping installation
|
Protection method
Pinch the pipe
Pinch or tape the pipe
Installer reference guide
37