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

8.1.1

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

8.1.2

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

8.2

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

8.2.1

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

8.2.2

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

8.2.3

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

8.2.4

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

8.2.5

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

8.3

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

8.3.1

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

8.3.2

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

8.3.3

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

8.3.4

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

8.3.5

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

8.3.6

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

8.3.7

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

8.3.8

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

8.3.9

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

8.4

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

8.4.1

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

8.4.2

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

8.4.3

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

8.4.4

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

8.4.5

To insulate the refrigerant piping ..........................................................................................................................

8.5

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

8.5.1

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

8.5.2

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

8.5.3

To determine the additional refrigerant amount..................................................................................................

8.5.4

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

8.5.5

To charge additional refrigerant ............................................................................................................................

8.5.6

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

8.6

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

8.6.1

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

8.6.2

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

8.6.3

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

8.6.4

To connect the water piping for domestic hot water ...........................................................................................

8.6.5

To connect the recirculation piping....................................................................................................................... 101

8.6.6

To fill the water circuit ........................................................................................................................................... 101

8.6.7

To fill the domestic hot water tank........................................................................................................................ 101

8.6.8

To insulate the water piping .................................................................................................................................. 102

INFORMATION

Also read the precautions and requirements in the

precautions" [

▪

Piping material: Phosphoric acid deoxidised seamless copper.

▪

Piping diameter:

Liquid piping

Gas piping

▪

Piping temper grade and thickness:

9].