Daikin 4MWXM52A2V1B User Manual

7 | Piping installation
Installer reference guide
33
4MWXM-A
R32 Split series
4P678385-1A – 2022.02
7 Piping installation
In this chapter
7.1 Preparing refrigerant piping................................................................................................................................................... 33
7.1.1 Refrigerant piping requirements ........................................................................................................................... 33
7.1.2 Refrigerant piping insulation.................................................................................................................................. 34
7.1.3 Refrigerant piping length and height difference ................................................................................................... 34
7.2 Connecting the refrigerant piping.......................................................................................................................................... 35
7.2.1 About connecting the refrigerant piping............................................................................................................... 35
7.2.2 Precautions when connecting the refrigerant piping............................................................................................ 35
7.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 37
7.2.4 Pipe bending guidelines ......................................................................................................................................... 37
7.2.5 To flare the pipe end.............................................................................................................................................. 37
7.2.6 Connections between outdoor and indoor unit using reducers........................................................................... 38
7.2.7 Using the stop valve and service port.................................................................................................................... 39
7.2.8 To connect the refrigerant piping to the outdoor unit ......................................................................................... 41
7.3 Checking the refrigerant piping.............................................................................................................................................. 41
7.3.1 About checking the refrigerant piping................................................................................................................... 41
7.3.2 Precautions when checking the refrigerant piping ............................................................................................... 42
7.3.3 To check for leaks................................................................................................................................................... 42
7.3.4 To perform vacuum drying .................................................................................................................................... 42
7.1 Preparing refrigerant piping
7.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions"[47].
CAUTION
Piping and joints of a split system shall be made with permanent joints when inside
an occupied space except joints directly connecting the piping to the indoor units.
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant. Use
phosphoric acid deoxidised seamless copper for refrigerant.
▪ Foreign materials inside pipes (including oils for fabrication) must be
≤30mg/10m.
Refrigerant piping diameter
Liquid piping Gas piping
4× Ø6.4mm (1/4") 2× Ø9.5mm (3/8")
2× Ø12.7mm (1/2")
INFORMATION
Usage of reducers might be required based on the indoor unit. See
"7.2.6 Connections between outdoor and indoor unit using reducers" [4 38] for
more information.

Daikin 4MWXM52A2V1B Specifications

General

Brand	Daikin
Model	4MWXM52A2V1B
Category	Air Conditioner
Language	English