Daikin Altherma EHYKOMB33AA - To Check the Water Volume: Examples; Connecting Water Piping; About Connecting the Water Piping; Precautions When Connecting the Water Piping

8 | Piping installation
Installer reference guide
103
EVLQ05+08CA + EHYHBH05A + EHYHBH/X08A + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1G – 2022.09
a Schrader valve
8.5.5 To check the water volume: Examples
Example 1
The indoor unit is installed 5m below the highest point in the water circuit. The
total water volume in the water circuit is 100l.
No actions or adjustments are required for either underfloor heating loops or
radiators.
Example 2
The indoor unit is installed at the highest point in the water circuit. The total water
volume in the water circuit is 350 l. Radiators are installed, so use the graph of
80°C.
Actions:
▪ Because the total water volume (350l) is more than the default water volume
(140l), the pre-pressure must be decreased.
▪ The required pre-pressure is:
Pg = (0.3+(H/10))bar = (0.3+(0/10))bar = 0.3bar
▪ The corresponding maximum water volume at 0.3bar is 205l. (See the graph in
the chapter above).
▪ Because 350 l is more than 205 l, the expansion vessel is too small for the
installation. Therefore install an extra vessel outside the installation.
8.6 Connecting water piping
8.6.1 About connecting the water piping
Before connecting the water piping
Make sure the outdoor unit, indoor unit and gas boiler are mounted.
Typical workflow
Connecting the water piping typically consists of the following stages:
1 Connecting the water piping of the indoor unit.
2 Connecting the water piping of the gas boiler.
3 Filling the space heating circuit.
4 Filling the domestic water circuit of the gas boiler.
5 Filling the domestic hot water tank.
6 Insulating the water piping.
8.6.2 Precautions when connecting the water piping
INFORMATION
Also read the precautions and requirements in the following chapters:
▪ "3General safety precautions"[412]
▪ "8.5Preparing water piping"[496]