Daikin Altherma EHYKOMB33AA - Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements

8 | Piping installation
Installer reference guide
84
EVLQ05+08CA + EHYHBH05A + EHYHBH/X08A + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1G – 2022.09
8 Piping installation
CAUTION
See "4 Specific installer safety instructions" [4 21] to make sure this installation
complies with all safety regulations.
In this chapter
8.1 Preparing refrigerant piping................................................................................................................................................... 84
8.1.1 Refrigerant piping requirements ........................................................................................................................... 84
8.1.2 Refrigerant piping insulation.................................................................................................................................. 85
8.2 Connecting the refrigerant piping.......................................................................................................................................... 85
8.2.1 About connecting the refrigerant piping............................................................................................................... 85
8.2.2 Precautions when connecting the refrigerant piping............................................................................................ 86
8.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 87
8.2.4 Pipe bending guidelines ......................................................................................................................................... 87
8.2.5 To flare the pipe end.............................................................................................................................................. 87
8.2.6 To braze the pipe end ............................................................................................................................................ 88
8.2.7 Using the stop valve and service port.................................................................................................................... 89
8.2.8 To connect the refrigerant piping to the outdoor unit ......................................................................................... 90
8.2.9 To connect the refrigerant piping to the indoor unit............................................................................................ 91
8.3 Checking the refrigerant piping.............................................................................................................................................. 91
8.3.1 About checking the refrigerant piping................................................................................................................... 91
8.3.2 Precautions when checking the refrigerant piping ............................................................................................... 92
8.3.3 To check for leaks................................................................................................................................................... 92
8.3.4 To perform vacuum drying .................................................................................................................................... 92
8.3.5 To insulate the refrigerant piping .......................................................................................................................... 93
8.4 Charging refrigerant ............................................................................................................................................................... 94
8.4.1 About charging refrigerant .................................................................................................................................... 94
8.4.2 Precautions when charging refrigerant ................................................................................................................. 95
8.4.3 To determine the additional refrigerant amount.................................................................................................. 95
8.4.4 To determine the complete recharge amount...................................................................................................... 95
8.4.5 To charge additional refrigerant............................................................................................................................ 95
8.4.6 To fix the fluorinated greenhouse gases label....................................................................................................... 96
8.5 Preparing water piping ........................................................................................................................................................... 96
8.5.1 Water circuit requirements ................................................................................................................................... 96
8.5.2 Formula to calculate the expansion vessel pre-pressure...................................................................................... 99
8.5.3 To check the water volume and flow rate............................................................................................................. 100
8.5.4 Changing the pre-pressure of the expansion vessel ............................................................................................. 102
8.5.5 To check the water volume: Examples .................................................................................................................. 103
8.6 Connecting water piping ........................................................................................................................................................ 103
8.6.1 About connecting the water piping ....................................................................................................................... 103
8.6.2 Precautions when connecting the water piping.................................................................................................... 103
8.6.3 Connecting the water piping of the indoor unit.................................................................................................... 104
8.6.4 Connecting the water piping of the gas boiler ...................................................................................................... 105
8.6.5 To fill the space heating circuit .............................................................................................................................. 106
8.6.6 To fill the domestic water circuit of the gas boiler................................................................................................ 107
8.6.7 To fill the domestic hot water tank........................................................................................................................ 107
8.6.8 To insulate the water piping .................................................................................................................................. 107
8.7 Connecting the gas piping ...................................................................................................................................................... 108
8.7.1 To connect the gas pipe......................................................................................................................................... 108
8.7.2 To perform an air purge on the gas supply ........................................................................................................... 108
8.1 Preparing refrigerant piping
8.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "3 General safety
precautions"[412].