Daikin FXFQ20BVEB - Precautions When Connecting the Refrigerant Piping; Guidelines When Connecting the Refrigerant Piping

6 | Installation
Installer and user reference guide
31
FXFQ20~125BVEB
VRV system air conditioner
4P561452-1B – 2021.07
6.3.2 Precautions when connecting the refrigerant piping
INFORMATION
Also read the precautions and requirements in the following chapters:
▪ General safety precautions
▪ Preparation
DANGER: RISK OF BURNING/SCALDING
CAUTION
▪ Do NOT use mineral oil on flared part.
▪ Do NOT reuse piping from previous installations.
▪ NEVER install a drier to this R410A 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 R410A when adding refrigerant.
▪ Only use installation tools (e.g. manifold gauge set) that are exclusively used for
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 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.
6.3.3 Guidelines when connecting the refrigerant piping
Take the following guidelines into account when connecting pipes: