To Check The Water Volume And Flow Rate; Connecting Water Piping; To Connect The Water Piping - Daikin Altherma 3 H MT ECH2O Series Installation Manual

NOTICE
Water circuit requirements. Make sure to comply with the
water pressure and water temperature requirements
below. For additional water circuit requirements, see the
installer reference guide.
▪ Water pressure – Space heating/cooling circuit. The maximum
water pressure is 3 bar. Provide adequate safeguards in the water
circuit to ensure that the maximum pressure is NOT exceeded.
The minimum water pressure to operate is 1 bar.
▪ Water pressure – Domestic hot water. The maximum water
pressure is 10 bar. Provide adequate safeguards in the DHW
circuit to ensure that the maximum pressure is NOT exceeded.
The minimum water pressure to operate is 1 bar.
▪ Water pressure – Storage tank. The water inside the storage
tank is not pressurized. Therefore a visual check of the water level
in the storage tank has to be carried out annually.
▪ Water temperature. All installed piping and piping accessories
(valve, connections,...) MUST
temperatures:
INFORMATION
The following illustration is an example and might NOT
match your system layout.
75°C
▪ Storage tank – Water quality. Minimum requirements regarding
the quality of water used to fill the storage tank:
▪ Water hardness (calcium and magnesium, calculated as
calcium carbonate): ≤3 mmol/l
▪ Conductivity: ≤1500 (ideal: ≤100) μS/cm
▪ Chloride: ≤250 mg/l
▪ Sulphate: ≤250 mg/l
▪ pH value: 6.5~8.5
For properties deviating from the minimum requirements, suitable
conditioning measures have to be taken.
5.1.1

To check the water volume and flow rate

To make sure that the unit operates properly:
▪ You MUST check the minimum water volume and the minimum
flow rate.
Minimum water volume
Check that the total water volume in the installation is minimum 20
litres, the internal water volume of the outdoor unit NOT included.
ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663479-1 – 2021.07
withstand the following
75°C
M
89°C
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.
Minimum required flow rate
20 l/min
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).
See the installer reference guide for more information.
See the recommended procedure as described in
commissioning" [ 4 36].
during
5.2

Connecting water piping

5.2.1

To connect the water piping

NOTICE
Do NOT use excessive force when connecting the field
piping and make sure the piping is aligned properly.
Deformation of the piping can cause malfunctioning of the
unit.
1 Connect the outdoor unit field piping to the water connection
pipes of the indoor unit.
Do NOT exceed the maximum tightening torque (Thread size 1",
25-30 N•m). To avoid damage, apply the necessary countertorque
with a suitable tool.
3
≤Ø7 mm
1
5 Piping installation
"8.2 Checklist
2
Installation manual
9