Daikin Altherma EABH16DA6V - Changing the Pre-Pressure of the Expansion Vessel; To Check the Water Volume: Examples

6 Preparation
Installer reference guide
25
EPGA11~16DAV3 + EABH/X16DA6V+9W
Daikin Altherma – Low temperature split
4P556069-1 – 2018.10
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 "7.5.6To protect the water circuit
against freezing"on page33.
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
Installation
height
difference
(a)
Water volume
≤200l >200l
≤7m No pre-pressure
adjustment is required.
Do the following:
▪ Decrease the pre-
pressure according to
the required installation
height difference. The
pre-pressure should
decrease by 0.1 bar for
each metre below 7 m.
▪ Check if the water
volume does NOT
exceed the maximum
allowed water volume.
>7m Do the following:
▪ Increase the pre-
pressure according to
the required
installation height
difference. The pre-
pressure should
increase by 0.1 bar for
each metre above 7 m.
▪ Check if the water
volume does NOT
exceed the maximum
allowed water 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.
(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.
Minimum flow rate
Check that the minimum flow rate in the installation is guaranteed in
all conditions. This minimum flow rate is required during defrost/
backup heater operation. For this purpose, use the overpressure
bypass valve delivered with the unit, and respect the minimum water
volume.
NOTICE
To guarantee proper operation it is recommended to have
a minimum flow of 28l/min during DHW.
NOTICE
If glycol was added to the water circuit, and the
temperature of the water circuit is low, the flow rate will
NOT be displayed on the user interface. In this case, the
minimum flow rate can be checked by way of the pump
test (check that the user interface does NOT display error
7H).
NOTICE
When circulation in each or certain space heating loops is
controlled by remotely controlled valves, it is important that
the minimum flow rate is guaranteed, even if all valves are
closed. In case the minimum flow rate cannot be reached,
a flow error 7H will be generated (no heating or operation).
Minimum required flow rate
20l/min
See the recommended procedure as described in "9.4 Checklist
during commissioning"on page71.
6.3.4 Changing the pre-pressure of the
expansion vessel
NOTICE
Only a licensed installer may adjust the pre-pressure of the
expansion vessel.
When changing the default pre-pressure of the expansion vessel
(1bar) is required, take following guidelines into account:
▪ Only use dry nitrogen to set the expansion vessel pre-pressure.
▪ Inappropriate setting of the expansion vessel pre-pressure will
lead to malfunction of the system.
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.
1
2
a
a Schrader valve
6.3.5 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.
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: