Daikin FVXM25A2V1B Installer's Reference Guide

7 | Piping installation
Installer reference guide
35
CVXM20+FVXM25~50A2V1B
Split system air conditioners
4P625991-1 – 2020.06
7 Piping installation
In this chapter
7.1 Preparing refrigerant piping................................................................................................................................................... 35
7.1.1 Refrigerant piping requirements ........................................................................................................................... 35
7.1.2 Refrigerant piping insulation.................................................................................................................................. 36
7.2 Connecting the refrigerant piping.......................................................................................................................................... 36
7.2.1 About connecting the refrigerant piping............................................................................................................... 36
7.2.2 Precautions when connecting the refrigerant piping............................................................................................ 36
7.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 37
7.2.4 Pipe bending guidelines ......................................................................................................................................... 38
7.2.5 To flare the pipe end.............................................................................................................................................. 38
7.2.6 To connect the refrigerant piping to the indoor unit............................................................................................ 39
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5].
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
Use the same diameters as the connections on the outdoor units:
Class Pipe outer diameter (mm)
Liquid piping Gas piping
25+35 Ø6.4 Ø9.5
50 Ø6.4 Ø12.7
Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Piping temper grade and thickness:
Outer diameter (Ø) Temper grade Thickness (t)
(a)
6.4mm (1/4") Annealed (O) ≥0.8mm
t
Ø
9.5mm (3/8")
12.7mm (1/2")
(a)
Depending on the applicable legislation and the maximum working pressure of the unit
(see "PS High" on the unit name plate), larger piping thickness might be required.

Daikin FVXM25A2V1B Specifications

General

Brand	Daikin
Model	FVXM25A2V1B
Category	Air Conditioner
Language	English