Daikin Altherma 3 H HT ECH20, Installation Manual

Page: 9 / 44

5 Piping installation
Installation manual
9
ETSH/X(B)16P30+50EF
Daikin Altherma 3 H HT ECH
₂ O
4P679468-1 – 2022.02
a
a Drain pan hose
7 Connect the pressure relief valve to an appropriate drain in
accordance with the applicable legislation. Ensure that any
steam or water that may escape is drained in a frost-protected,
safe and observable manner.
a
a Pressure relief valve
5 Piping installation
5.1 Preparing water piping
NOTICE
In case of plastic pipes, make sure they are fully oxygen
diffusion tight according to DIN 4726. The diffusion of
oxygen into the piping can lead to excessive corrosion.
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 (=0.3 MPa). 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
(=0.1 MPa).
▪ 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 withstand the following
temperatures:
INFORMATION
The following illustration is an example and might NOT
match your system layout.
89°C 75°C
M
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 25
litres, the internal water volume of the outdoor unit NOT included.
Minimum flow rate
Check that the minimum flow rate in the installation is guaranteed in
all conditions.
Minimum required flow rate
25 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).