Pipe Bending Guidelines; Guidelines When Connecting The Refrigerant Piping - Daikin FXSN112A2VEB Installer And User Manual

16 | Piping installation

16.2.3 Pipe bending guidelines

16.2.4 Guidelines when connecting the refrigerant piping

Installer and user reference guide
58
DANGER: RISK OF BURNING
CAUTION
Do NOT reuse piping from previous installations.
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 R744 (CO₂) when adding refrigerant.
▪
Only use installation tools (e.g. manifold gauge set) that are exclusively used for
R744 (CO₂) installations to withstand the pressure and to prevent foreign
materials (e.g. mineral oils and moisture) from entering the system.
▪
Do NOT leave pipes unattended at the site. If you will finish the work in less than
1 month, tape the pipe ends or pinch the pipe (see figure below). Pipes that are
installed outdoors must be pinched, regardless of the duration of the works.
▪
Use caution when passing copper tubes through walls (see figure below).
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.
Use a pipe bender for bending. All pipe bends should be as gentle as possible.
Pipe outer diameter (Ø)
9.5 mm (3/8")
12.7 mm (1/2")
▪ When brazing, blow through with nitrogen to prevent creation of large quantities
of oxidized film on the inside of the piping. This film adversely affects valves and
compressors in the refrigerating system and prevents proper operation.
▪ Set the nitrogen pressure to 20 kPa (0.2 bar) (just enough so it can be felt on the
skin) with a pressure-reducing valve.
a b
f
a Refrigerant piping
b Part to be brazed
Bending radius
≥43 mm
≥52 mm
c d e
f
FXSN50~112A2VEB
CO₂ Conveni-Pack: indoor unit
4P602817-1 – 2020.02