17 Piping installation
In this chapter
17.1 Preparing refrigerant piping
17.1.1 Refrigerant piping requirements
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C - 2021.11
17.1
Preparing refrigerant piping ...................................................................................................................................................
17.1.1
Refrigerant piping requirements ...........................................................................................................................
17.1.2
Refrigerant piping insulation..................................................................................................................................
17.1.3
To select the piping size .........................................................................................................................................
17.1.4
17.1.5
About the piping length .........................................................................................................................................
17.1.6
Piping length: VRV DX only.....................................................................................................................................
17.1.7
17.1.8
17.1.9
17.2
Connecting the refrigerant piping..........................................................................................................................................
17.2.1
17.2.2
17.2.3
17.2.4
To route the refrigerant piping ..............................................................................................................................
17.2.5
17.2.6
17.2.7
17.2.8
17.2.9
To braze the pipe end ............................................................................................................................................
17.2.11 To remove the spun pipes .....................................................................................................................................
17.3
Checking the refrigerant piping..............................................................................................................................................
17.3.1
17.3.2
17.3.3
17.3.4
To perform a leak test............................................................................................................................................
17.3.5
To perform vacuum drying ....................................................................................................................................
17.3.6
17.4
Charging refrigerant ...............................................................................................................................................................
17.4.1
17.4.2
About charging refrigerant ....................................................................................................................................
17.4.3
17.4.4
17.4.5
To charge refrigerant ............................................................................................................................................. 102
17.4.6
17.4.7
17.4.8
17.4.9
NOTICE
The refrigerant R410A 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: R410A does not contain any chlorine, does not destroy the ozone layer,
and does not reduce earth's protection against harmful ultraviolet radiation.
R410A can contribute to the greenhouse effect if it is released. Therefore pay
special attention to check the tightness of the installation.
17
Piping installation
|
Installer and user reference guide
69
69
70
70
73
75
75
79
80
81
82
82
83
84
84
85
85
86
86
87
88
90
91
91
92
93
93
94
95
95
95
96
97
69