5 Piping installation
Installation manual
14
ELBH/X12E
Daikin Altherma 3 R MT W
4P708482-1 – 2023.03
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 (=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 temperature.
All installed piping and piping accessories
(valve,
connections,…)
MUST
withstand
the
following
temperatures:
INFORMATION
The following figure is an example and may NOT
completely match your system layout
EXAMPLE
(*) 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…
Then the minimum water
volume is…
Cooling operation
21 l
Heating operation
21 l
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.
Minimum flow rate
Check that the minimum flow rate in the installation is guaranteed in
all conditions. For this purpose, use the differential pressure bypass
valve delivered with the unit, and respect the minimum water
volume.
If operation is…
Then the minimum required
flow rate is…
Cooling
10 l/min
Heating/defrost
20 l/min
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
36].
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
differential pressure 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 differential pressure bypass valve on the space heating
water outlet.
1
Install the shut-off valves on the water pipes.
Summary of Contents for Altherma 3 R MT W
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