Formula To Calculate The Expansion Vessel Pre-Pressure; To Check The Water Volume And Flow Rate Of The Space Heating Circuit And Brine Circuit; Changing The Pre-Pressure Of The Expansion Vessel - Daikin Altherma 3 GEO Series Installer's Reference Manual

INFORMATION
Be aware of the hygroscopic property of anti-freeze fluids:
it absorbs moisture from its environment. Leaving the cap
off the anti-freeze fluid container causes the concentration
of water to increase. The anti-freeze fluid concentration is
then lower than assumed. And in consequence, freezing
can happen after all.
Preventive actions MUST be taken to ensure minimal
exposure of the anti-freeze fluid to air.
▪ Non-brass metallic piping. When using non-brass metallic
piping, insulate the brass and non-brass properly so that they do
NOT make contact with each other. This to prevent galvanic
corrosion.
▪ Valve – Change‑over time. When using a 2-way valve in the
space heating circuit, the maximum change-over time of the valve
MUST be 60 seconds.
▪ Domestic hot water tank – Capacity. To avoid stagnation of
water, it is important that the storage capacity of the domestic hot
water tank meets the daily consumption of domestic hot water.
▪ Domestic hot water tank – After installation. Immediately after
installation, the domestic hot water tank must be flushed with fresh
water. This procedure must be repeated at least once a day the
first 5 consecutive days after installation.
▪ Domestic hot water tank – Standstills. In cases where during
longer periods of time there is no consumption of hot water, the
equipment MUST be flushed with fresh water before usage.
▪ Thermostatic mixing valves. In accordance with the applicable
legislation, it may be necessary to install thermostatic mixing
valves.
▪ Hygienic measures. The installation must be in compliance with
the applicable legislation and may require additional hygienic
installation measures.
▪ Recirculation pump. In
legislation, it may be required to connect a recirculation pump in
between the hot water end point and the recirculation connection
of the domestic hot water tank.
c
a b
d
a Recirculation connection
b Hot water connection
c Shower
d Recirculation pump
7.1.2 Formula to calculate the expansion vessel
pre-pressure
The pre-pressure (Pg) of the vessel depends on the installation
height difference (H):
Pg=0.3+(H/10) (bar)
7.1.3 To check the water volume and flow rate
of the space heating circuit and brine
circuit
The unit does not have an integrated expansion vessel, but a field
supplied expansion vessel can be installed in the brine circuit in case
installing the brine level vessel (delivered as accessory) is not
optimal. For more information, see
vessel" [ 4 30].
To make sure that the unit operates properly:
▪ You must check the minimum water volume.
EGSAH/X06+10DA9W(G)
Daikin Altherma 3 GEO
4P569820-1A – 2019.09
accordance with the applicable
"7.2.4 To connect the brine level
▪ You might need to adjust the pre-pressure of the expansion
vessel.
▪ You must check the total space heating water volume in the unit.
▪ You must check the total brine water volume in the unit.
Minimum water volume
Check that the total water volume per circuit in the installation is
minimum 20 litre, the internal water volume of the indoor unit NOT
included.
INFORMATION
If a minimum heating load of 1 kW can be guaranteed and
setting [4.B] Space
(overview field setting [9‑04]) is 4°C, the minimum water
volume can be lowered to 10 litre.
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.
c
M1 M2 M3
a a a
a External room thermostat
b Remote outdoor sensor
c By-pass valve (field supply)
d Shut-off valve
Minimum flow rate
Minimum required flow rate
Heat pump operation
Cooling operation
Backup heater operation
7.1.4 Changing the pre-pressure of the
expansion vessel
NOTICE
Only a licensed installer may adjust the pre-pressure of the
expansion vessel.
The expansion vessel is field supplied. For more information on how
to change the pre-pressure, see the manual of the expansion vessel.
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.
7 Piping installation
heating/cooling > Overshoot
d
d
b
No minimum required flow
10 l/min
No minimum required flow during
heating
Installer reference guide
29