5 Piping installation
Installation manual
8
ETBH/9W
Daikin Altherma 3 H HT W
4P644727-1 – 2021.02
75°C
(*)
89°C
(*)
75°C
(*)
M
M
EXAMPLE
(*) Maximum temperature for piping and accessories
5.1.1
To check the water volume and 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.
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. This minimum flow rate is required during defrost/
backup heater operation. For this purpose, use the overpressure
bypass valve delivered with the unit, and respect the minimum water
volume.
Minimum required flow rate
25 l/min
NOTICE
To guarantee proper operation it is recommended to have
a minimum flow of 28 l/min during DHW.
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
5.1.2
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.
▪ 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.
NOTICE
Configuration.
Configuration of a third-party tank depends
on the size of the heat exchanger coil of the tank. For more
information, see the installer reference guide.
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.
NOTICE
Do NOT use excessive force when connecting the piping.
Deformation of the piping can cause malfunctioning of the
unit.
1
Connect the O-rings and shut-off valves to the indoor unit water
connections.
2
Connect the outdoor unit field piping on the water IN connection
(a) of the indoor unit.
3
Connect the space heating/cooling field piping on the space
heating water OUT connection (b) of the indoor unit.
b
a
a
Water IN (screw connection, 1")
b
Space heating water OUT (screw connection, 1")
