Connecting Refrigerant Piping; To Connect The Refrigerant Piping To The Indoor Unit; Preparing Water Piping; To Check The Water Volume And Flow Rate - Daikin Altherma 3 R ECH2O Installation Manual

5 Piping installation
If the temperature is higher than 30°C and the humidity is higher
than RH 80%, the thickness of the insulation materials should be at
least 20 mm to prevent condensation on the surface of the
insulation.
5.2

Connecting refrigerant piping

See the installation manual of the outdoor unit for all guidelines,
specifications and installation instructions.
5.2.1 To connect the refrigerant piping to the
indoor unit
1 Connect the liquid stop valve from the outdoor unit to the
refrigerant liquid connection of the indoor unit.
b
a
a Refrigerant liquid connection
b Refrigerant gas connection
2 Connect the gas stop valve from the outdoor unit to the
refrigerant gas connection of the indoor unit.
5.3

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. 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:
Installation manual
18
withstand the following
INFORMATION
The following illustration is an example and might NOT
match your system layout.
▪ 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.
5.3.1

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.
Minimum flow rate
Check that the minimum flow rate in the installation is guaranteed in
all conditions.
If operation is...
Cooling
Heating/defrost
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 44].
during
60°C
M
89°C
Then the minimum required
flow rate is...
16 l/min
22 l/min
"8.2 Checklist
EBSH/X(B)11+16P30+50DF
Daikin Altherma 3 R ECH₂O
4P663483-1A – 2021.11