Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements - Daikin FXFN50A2VEB Installer And User Reference Manual

17 Piping installation

In this chapter

17.1 Preparing refrigerant piping

17.1.1 Refrigerant piping requirements

Refrigerant piping diameter
FXFN50~112A2VEB
CO₂ Conveni-Pack: indoor unit
4P677925-1 - 2021.07
17.1 Preparing refrigerant piping ...................................................................................................................................................
17.1.1 Refrigerant piping requirements ...........................................................................................................................
17.1.2 Refrigerant piping insulation..................................................................................................................................
17.2 Connecting the refrigerant piping..........................................................................................................................................
17.2.1 About connecting the refrigerant piping...............................................................................................................
17.2.2 Precautions when connecting the refrigerant piping............................................................................................
17.2.3 Guidelines when connecting the refrigerant piping..............................................................................................
17.2.4 To connect the refrigerant piping to the indoor unit............................................................................................
INFORMATION
Also read the precautions and requirements in the
4
precautions" [
NOTICE
The refrigerant R744 requires strict cautions for keeping the system clean, dry and
tight.
▪
Clean and dry: foreign materials (including mineral oils or moisture) should be
prevented from getting mixed into the system.
▪
Tight: R744 does not contain any chlorine, does not destroy the ozone layer, and
does not reduce earth's protection against harmful ultraviolet radiation. R744 can
contribute to the greenhouse effect if it is released. Therefore pay special
attention to check the tightness of the installation.
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant and
oil. Use K65 copper-iron alloy tube system for high-pressure applications with a
working pressure of 120 bar at the air conditioner side and 90 bar at the refrigeration
side.
▪ Foreign materials inside pipes (including oils for fabrication) must be
≤30 mg/10 m.
NOTICE
If the ability to close the stop valves for field piping is wanted, the installer MUST
install a pressure relief valve on the following piping:
▪
Outdoor unit to refrigeration indoor units: on liquid piping
▪
Outdoor unit to air conditioning indoor units: on liquid piping AND gas piping
Liquid piping
Ø9.5 mm
5].
Gas piping
Ø12.7 mm
17 Piping installation
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"2 General safety
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