Daikin EPRA08EAV3, Installer'S Reference Manual

Page: 84 / 292

8 | Piping installation
Installer reference guide
84
EPRA08~W1 + ETVH/9W
Daikin Altherma 3 H MT F
4P634886-1 – 2021.03
8.1.3 To check the water volume and flow rate
The indoor unit has an expansion vessel of 10 litre with a factory-set pre-pressure
of 1 bar.
To make sure that the unit operates properly:
▪ 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 higher than the minimum
water volume, the internal water volume of the indoor unit NOT included:
If… Then the minimum water volume
is…
Cooling operation 20 l
Heating operation 0 l
INFORMATION
In critical processes, or in rooms with a high heat load, extra water might be
required.
NOTICE
When circulation in each space heating/cooling loop is controlled by remotely
controlled valves, it is important that the minimum water volume is guaranteed,
even if all of the valves are closed.
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
"8.2.6 To protect the
water circuit against freezing" [
4
91].
Use the following graph to determine the maximum water volume for the
calculated pre-pressure.