Daikin EVLQ08CAV3 [51/252] To check the water volume examples

6 | Preparation

Installer reference guide

EVLQ05+08CAV3 + EHYHBH05AF + EHYHBH/X08AF + EHYKOMB33AA

Daikin Altherma hybrid heat pump

4P355634-1F – 2020.10

a Schrader valve

6.4.5 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.

6.5 Preparing electrical wiring

6.5.1 About preparing electrical wiring

INFORMATION

Also read the precautions and requirements in the "1 General safety

precautions"[46].