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Piping installation
Installer reference guide
77
EPRA14~W1 + ETVH/9W(G)
Daikin Altherma 3 H HT F
4P587502-1 – 2019.07
▪
You must check the minimum and maximum water volume.
▪
You might need to adjust the pre-pressure of the expansion vessel.
Minimum water volume
Check that the total water volume in the installation is minimum 20 litres, the
internal water volume of the outdoor unit NOT included.
INFORMATION
In critical processes, or in rooms with a high heat load, extra water might be
required.
M2
a
b
a
a
c
c
c
c
M3
M1
c
a
Individual room thermostat (optional)
b
Overpressure bypass valve (delivered as accessory)
c
Shut-off valve
Maximum water volume
NOTICE
The maximum water volume depends on whether glycol is added to the water
circuit. For more information on the addition of glycol, refer to
water circuit against freezing"
83].
Use the following graph to determine the maximum water volume for the
calculated pre-pressure.
20
2,4
2,1
1,8
1,5
1,2
0,9
1
0,6
0,3
70
120
170
140
200 220
270
320
A
B
A
Pre-pressure (bar)
B
Maximum water volume (l)
Water
Water + glycol
Example: Maximum water volume and expansion vessel pre-pressure
