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Piping installation
8 Piping installation
In this chapter
8.1 Preparing refrigerant piping
8.1.1 Refrigerant piping requirements
Installer reference guide
82
INFORMATION
This unit is a heating only model. Therefore, all references to cooling in this
document are NOT applicable.
8.1
Preparing refrigerant piping ...................................................................................................................................................
8.1.1
Refrigerant piping requirements ...........................................................................................................................
8.1.2
Refrigerant piping insulation..................................................................................................................................
8.2
Connecting the refrigerant piping..........................................................................................................................................
8.2.1
About connecting the refrigerant piping...............................................................................................................
8.2.2
Precautions when connecting the refrigerant piping............................................................................................
8.2.3
Guidelines when connecting the refrigerant piping..............................................................................................
8.2.4
Pipe bending guidelines .........................................................................................................................................
8.2.5
To flare the pipe end..............................................................................................................................................
8.2.6
To braze the pipe end ............................................................................................................................................
8.2.7
Using the stop valve and service port....................................................................................................................
8.2.8
To connect the refrigerant piping to the outdoor unit .........................................................................................
8.2.9
To connect the refrigerant piping to the indoor unit............................................................................................
8.3
Checking the refrigerant piping..............................................................................................................................................
8.3.1
About checking the refrigerant piping...................................................................................................................
8.3.2
Precautions when checking the refrigerant piping ...............................................................................................
8.3.3
Checking refrigerant piping: Setup ........................................................................................................................
8.3.4
To check for leaks...................................................................................................................................................
8.3.5
To perform vacuum drying ....................................................................................................................................
8.4
Charging refrigerant ...............................................................................................................................................................
8.4.1
About charging refrigerant ....................................................................................................................................
8.4.2
Precautions when charging refrigerant .................................................................................................................
8.4.3
Charging additional refrigerant..............................................................................................................................
8.4.4
Completely recharging refrigerant ........................................................................................................................
8.4.5
To fix the fluorinated greenhouse gases label.......................................................................................................
8.5
Preparing water piping ...........................................................................................................................................................
8.5.1
Water circuit requirements ...................................................................................................................................
8.5.2
Formula to calculate the expansion vessel pre-pressure...................................................................................... 100
8.5.3
To check the water volume and flow rate............................................................................................................. 100
8.5.4
Changing the pre-pressure of the expansion vessel ............................................................................................. 103
8.5.5
To check the water volume: Examples .................................................................................................................. 103
8.6
Connecting water piping ........................................................................................................................................................ 104
8.6.1
About connecting the water piping ....................................................................................................................... 104
8.6.2
Precautions when connecting the water piping.................................................................................................... 104
8.6.3
To connect the water piping.................................................................................................................................. 104
8.6.4
To connect the recirculation piping....................................................................................................................... 107
8.6.5
To fill the water circuit ........................................................................................................................................... 107
8.6.6
To fill the domestic hot water tank........................................................................................................................ 107
8.6.7
To insulate the water piping .................................................................................................................................. 107
INFORMATION
Also read the precautions and requirements in the
4
precautions" [
Also see
"7.1.4 Special requirements for R32
requirements.
▪
Piping length: See
"7.1.3 Installation site requirements of the indoor
10].
"2 General safety
4
units" [
55] for additional
unit" [
ERRA08~12E + ELVZ12S18+23E
Daikin Altherma 3 R MT F
4P708478-1 - 2023.05
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