Guidelines When Connecting The Refrigerant Piping - Daikin FAA71BUV1B Installer And User Reference Manual

17 | Piping installation

17.2.3 Guidelines when connecting the refrigerant piping

Installer and user reference guide
64
CAUTION
▪
Do NOT use mineral oil on flared part.
▪
Do NOT reuse piping from previous installations.
▪
NEVER install a drier to this 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 or R410A when adding refrigerant. Refer to the outdoor unit
specifications for the type of refrigerant to be used.
▪
Only use installation tools (e.g. manifold gauge set) that are exclusively used for
R32 or R410A 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.
▪ 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
>1 month
<1 month
Regardless of the period
Protection method
Pinch the pipe
Pinch or tape the pipe
FAA71+100BUV1B
Split system air conditioner
4P654517-1 – 2021.03