8.1.5 To check the water volume: Examples
8.2 Connecting water piping
8.2.1 About connecting the water piping
EPRA08~12EAV3+W1 + ETVH12SU18+23EA6V
Daikin Altherma 3 H MT F
4P644482-1 – 2021.03
Changing the pre-pressure of the expansion vessel should be done by releasing or
increasing nitrogen pressure through the Schrader valve of the expansion vessel.
a Schrader valve
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.
Example 2
The indoor unit is installed at the highest point in the water circuit. The total water
volume in the water circuit is 250 l.
Actions:
▪
Because the total water volume (250 l) is more than the default water volume
(200 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 290 l. (See the graph in
"Maximum water
volume" [
▪
Because 250 l is lower than 290 l, the expansion vessel is appropriate for the
installation.
Before connecting the water piping
Make sure the outdoor and indoor unit are mounted.
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Piping installation
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a
Installer reference guide
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