Daikin LRNUN5A7Y1, Инструкция для установки и пользователя

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16 | Piping installation
Installer and user reference guide
64
LRYELRNUN5A7Y1
CO₂ Conveni-Pack outdoor unit
4P605460-1 – 2020.08
16 Piping installation
In this chapter
16.1 Preparing refrigerant piping ................................................................................................................................................... 64
16.1.1 Refrigerant piping requirements ........................................................................................................................... 64
16.1.2 Refrigerant piping material .................................................................................................................................... 65
16.1.3 Refrigerant piping length and height difference ................................................................................................... 65
16.1.4 To select the piping size ......................................................................................................................................... 67
16.1.5 To select refrigerant branch kits............................................................................................................................ 69
16.1.6 To select expansion valves for refrigeration.......................................................................................................... 70
16.2 Using stop valves and service ports ....................................................................................................................................... 71
16.2.1 Overview stop valves for refrigeration and air-conditioner.................................................................................. 71
16.2.2 Overview stop valves for maintenance ................................................................................................................. 71
16.2.3 To handle the stop valve ........................................................................................................................................ 72
16.2.4 To handle the service port ..................................................................................................................................... 74
16.2.5 Tightening torques ................................................................................................................................................. 75
16.3 Connecting the refrigerant piping.......................................................................................................................................... 75
16.3.1 About connecting the refrigerant piping............................................................................................................... 75
16.3.2 Precautions when connecting the refrigerant piping............................................................................................ 76
16.3.3 To remove the spun pipes ..................................................................................................................................... 77
16.3.4 To connect the refrigerant piping to the outdoor unit ......................................................................................... 78
16.3.5 To braze the pipe end ............................................................................................................................................ 80
16.3.6 Guidelines to connect T-joints ............................................................................................................................... 81
16.3.7 Guidelines to install a dryer ................................................................................................................................... 82
16.3.8 Guidelines to install safety valves .......................................................................................................................... 83
16.3.9 Guidelines to install blow off piping ...................................................................................................................... 83
16.4 Checking the refrigerant piping.............................................................................................................................................. 83
16.4.1 About checking the refrigerant piping................................................................................................................... 84
16.4.2 Checking refrigerant piping: General guidelines ................................................................................................... 84
16.4.3 Checking refrigerant piping: Setup ........................................................................................................................ 85
16.4.4 To perform a leak test............................................................................................................................................ 85
16.4.5 To perform vacuum drying .................................................................................................................................... 86
16.5 Insulating the refrigerant piping............................................................................................................................................. 87
16.1 Preparing refrigerant piping
16.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions" [
4
6].
WARNING
The unit is partially factory charged with refrigerant R744.
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.