Preparing refrigerant piping ...................................................................................................................................................

7.1.1

Refrigerant piping requirements ...........................................................................................................................

7.1.2

Refrigerant piping insulation..................................................................................................................................

7.2

Preparing water piping ...........................................................................................................................................................

7.2.1

Water circuit requirements ...................................................................................................................................

7.2.2

Formula to calculate the expansion vessel pre-pressure......................................................................................

7.2.3

To check the water volume and flow rate.............................................................................................................

7.2.4

Changing the pre-pressure of the expansion vessel .............................................................................................

7.2.5

To check the water volume: Examples ..................................................................................................................

7.3

Connecting the refrigerant piping..........................................................................................................................................

7.3.1

About connecting the refrigerant piping...............................................................................................................

7.3.2

Precautions when connecting the refrigerant piping............................................................................................

7.3.3

Guidelines when connecting the refrigerant piping..............................................................................................

7.3.4

Pipe bending guidelines .........................................................................................................................................

7.3.5

To flare the pipe end..............................................................................................................................................

7.3.6

To braze the pipe end ............................................................................................................................................

7.3.7

Using the stop valve and service port....................................................................................................................

7.3.8

To connect the refrigerant piping to the outdoor unit .........................................................................................

7.3.9

To connect the refrigerant piping to the indoor unit............................................................................................

7.4

Checking the refrigerant piping..............................................................................................................................................

7.4.1

About checking the refrigerant piping...................................................................................................................

7.4.2

Precautions when checking the refrigerant piping ...............................................................................................

7.4.3

To check for leaks...................................................................................................................................................

7.4.4

To perform vacuum drying ....................................................................................................................................

7.5

Charging refrigerant ...............................................................................................................................................................

7.5.1

About charging refrigerant ....................................................................................................................................

7.5.2

About the refrigerant .............................................................................................................................................

7.5.3

Precautions when charging refrigerant .................................................................................................................

7.5.4

To determine the complete recharge amount......................................................................................................

7.5.5

To fix the fluorinated greenhouse gases label.......................................................................................................

7.6

Connecting water piping ........................................................................................................................................................

7.6.1

About connecting the water piping .......................................................................................................................

7.6.2

Precautions when connecting the water piping....................................................................................................

7.6.3

To connect the water piping..................................................................................................................................

7.6.4

To connect the recirculation piping.......................................................................................................................

7.6.5

To fill the water circuit ...........................................................................................................................................

7.6.6

To fill the domestic hot water tank........................................................................................................................

7.6.7

To insulate the water piping ..................................................................................................................................

INFORMATION

Also read the precautions and requirements in the "General safety precautions"

chapter.

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Piping material: Phosphoric acid deoxidised seamless copper.

▪

Piping diameter:

Liquid piping

Gas piping

▪

Piping temper grade and thickness:

Piping installation