Daikin Altherma EHVH04S23DAV - Changing the Pre-Pressure of the Expansion Vessel

6 Preparation
Installer reference guide
27
ERGA04~08DAV3(A) + EHVH04+08S23DAV
Daikin Altherma – Low temperature split
4P499573-1 – 2017.12
FHL1
FHL2
FHL3
M1
T1
M2
T2
M3
T3
eea db f gc
a Outdoor unit
b Indoor unit
c Heat exchanger
d Pump
e Shut-off valve
f Collector (field supply)
g Overpressure bypass valve (delivered as accessory)
FHL1...3 Floor heating loop (field supply)
T1...3 Individual room thermostat (optional)
M1...3 Individual motorised valve to control loop FHL1...3 (field
supply)
Maximum water volume
Use the following graph to determine the maximum water volume for
the calculated pre-pressure.
0.3
0.5
1
1.5
2
2.4
5020 100 150 200 250 290
a
b
a Pre-pressure (bar)
b Maximum water volume (l)
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.
Installation
height
difference
(a)
Water volume
≤200l >200l
>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 (if applicable). For this purpose, use the
overpressure bypass valve delivered with the unit, and respect the
minimum water volume.
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 during defrost/backup heater
operation
12l/min
See the recommended procedure as described in "9.4 Checklist
during commissioning"on page76.
6.4.4 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.
Final English - Tanslations in progress