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5 Preparation
Minimum water volume
Check that the total water volume in the installation is minimum
20 litre, 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.
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.
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 the installation manual of the
domestic hot water tank.
Use the following graph to determine the maximum water volume for
the calculated pre-pressure.
A
2,4
2,1
1,8
1,5
1,2
1
0,9
0,6
0,3
20
70
120
105
A
Pre-pressure (bar)
B
Maximum water volume (l)
Water
Water + glycol
Example: Maximum water volume and expansion vessel pre-
pressure
Installation
height
≤185/105 l
(a)
difference
≤7 m
No pre-pressure
adjustment is required.
>7 m
Do the following:
▪ Increase
the
pressure according to
the
installation
difference.
The
pressure
increase by 0.1 bar for
each metre above 7 m.
▪ Check if the water
volume
does
exceed the maximum
allowed water volume.
Installer reference guide
10
170
220
270
150
185
B
Water volume
(b)
(b)
>185/105 l
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.
The expansion vessel of
the outdoor unit is too
pre-
small for the installation.
In this case, it is
required
recommended to install
height
an extra vessel outside
pre-
the unit.
should
NOT
(a)
This is the height difference (m) between the highest point
of the water circuit and the outdoor unit. If the outdoor unit
is at the highest point of the installation, the installation
height is 0 m.
(b)
The maximum water volume is 185 l in case the circuit is
only filled with water, and 105 l in case the circuit is filled
with water and glycol.
Minimum flow rate
Check that the minimum flow rate (required during defrost/backup
heater operation) in the installation is guaranteed in all conditions.
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
05+07 models
See the recommended procedure as described in the installation
manual of the domestic hot water tank.
5.3.4
Changing the pre-pressure of the
expansion vessel
NOTICE
Only a licensed installer may adjust the pre-pressure of the
expansion vessel.
The default pre-pressure of the expansion vessel is 1 bar. When it is
required to change the pre-pressure, 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.
a
a
Schrader valve
5.3.5
To check the water volume: Examples
Example 1
Daikin Altherma monobloc compact outdoor unit
13 l/min
EBLQ05+07C2V3
4P598847-1 – 2019.10
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