Daikin Altherma EVLQ05+08CA Installer's Reference Manual page 49

EVLQ05+08CAV3 + EHYHBH05AF + EHYHBH/X08AF + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1F – 2020.10
f Pump
g Shut‑off valve (field supply)
h Collector
i Bypass valve (field supply)
RAD1...3 Radiator (field supply)
Maximum water volume
Use the following graph to determine the maximum water volume for the
calculated pre-pressure.
a
2.6
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.3
0 50 100
a Pre-pressure (bar)
b Maximum water volume (l)
Maximum leaving water temperature of 55°C for underfloor heating applications
Maximum leaving water temperature of 80°C for radiator applications
Example in case of an underfloor heating application: Maximum water volume
and expansion vessel pre-pressure in case of 55°C
Installation
height
(a)
difference
≤7 m No pre-pressure adjustment is
required.
>7 m Do the following:
▪ Increase the pre-pressure.
▪ Check if the water volume
does
maximum
volume.
(a) This is the height difference (m) between the highest point of the water circuit and
the indoor unit. If the indoor unit is at the highest point of the installation, the
installation height is 0 m.
Example in case of a radiator application: Maximum water volume and
expansion vessel pre-pressure in case of 80°C
150 200 250 300 350
Water volume
≤280 l
NOT exceed the
allowed water
6 Preparation
|
b
400 450
>280 l
Do the following:
▪ Decrease the pre-pressure.
▪ Check if the water volume
does NOT exceed
maximum allowed
volume.
The expansion vessel of the
indoor unit is too small for the
installation. In this case, it is
recommended to install an
extra vessel outside the unit.
Installer reference guide
the
water
49