Precautions When Connecting The Refrigerant Piping; Guidelines When Connecting The Refrigerant Piping - Daikin FXFN50A2VEB Installer And User Reference Manual

17.2.2 Precautions when connecting the refrigerant piping

17.2.3 Guidelines when connecting the refrigerant piping

FXFN50~112A2VEB
CO₂ Conveni-Pack: indoor unit
4P677925-1 – 2021.07
INFORMATION
Also read the precautions and requirements in the following chapters:
▪
"2 General safety
▪
"17.1 Preparing refrigerant
DANGER: RISK OF BURNING/SCALDING
CAUTION
NEVER bend high pressure piping! Bending can reduce the pipe thickness and thus
weaken the piping. ALWAYS use K65 fittings.
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.
▪ 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.
4
precautions" [ 5]
4
piping" [ 61]
17 Piping installation
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Installer and user reference guide
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