Preparing Water Piping; To Check The Water Volume And Flow Rate; Third-Party Tank Requirements; Connecting Water Piping - Daikin Altherma 3 R W Installation Manual

5 Piping installation
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 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.
(*) Maximum temperature for piping and accessories
5.3.1

To check the water volume and flow rate

Minimum water volume
Check that the total water volume in the installation is higher than
the minimum water volume, the internal water volume of the indoor
unit NOT included:
If...
Cooling operation
Heating operation
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.
Installation manual
16
withstand the following
89°C (*)
60°C (*)
M
M
Then the minimum water
volume is...
20 l
20 l
Minimum flow rate
Check that the minimum flow rate in the installation is guaranteed in
all conditions. For this purpose, use the overpressure bypass valve
delivered with the unit, and respect the minimum water volume.
If operation is...
Cooling
Heating/defrost
Domestic hot water production
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 37].
during
5.3.2

Third-party tank requirements

In case of a third-party tank, the tank shall adhere to the following
requirements:
▪ The heat exchanger coil of the tank is ≥1.05 m² and ≤3.7 m².
▪ The tank thermistor must be located above the heat exchanger
coil.
▪ The booster heater must be located above the heat exchanger
coil.
NOTICE
Performance. Performance data for third-party tanks
CANNOT be provided, and performance CANNOT be
guaranteed.
5.4

Connecting water piping

5.4.1

To connect the water piping

NOTICE
Do NOT use excessive force when connecting the piping.
Deformation of the piping can cause malfunctioning of the
unit.
To facilitate service and maintenance, 2 shut-off valves and 1
overpressure bypass valve are provided. Mount the shut-off valves
on the space heating water inlet and space heating water outlet. To
ensure the minimum flow rate (and prevent overpressure), install the
overpressure bypass valve on the space heating water outlet.
1 Install the shut-off valves on the water pipes.
Then the minimum required
flow rate is...
16 l/min
22 l/min
"8.2 Checklist
EBBH/X11+16DF
Daikin Altherma 3 R W
4P643600-1B – 2021.10