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5 Piping installation
▪ Water pressure – Domestic hot water. The maximum water
pressure is 10 bar (=1.0 MPa), and must be in accordance with
the applicable legislation. Provide adequate safeguards in the
water circuit to ensure that the maximum pressure is NOT
exceeded (see
"5.3.1 To connect the water
minimum water pressure to operate is 1 bar (=0.1 MPa).
▪ 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
temperatures:
INFORMATION
The following figure is an example and may NOT
completely match your system layout
(*) Maximum temperature for piping and accessories
5.2.1
To check the water volume and flow rate
Minimum water volume
There are no requirements for the minimum water volume.
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
operation. For this purpose, it is recommended to use a differential
pressure bypass valve (field supply).
Minimum required flow rate
12 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
commissioning" [ 4 25].
during
Installation manual
8
piping" [ 4 8]). The
withstand
the
following
89°C (*)
75°C (*)
M
"8.2 Checklist
5.3
Connecting water piping
5.3.1
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.
1 Connect the space heating water in and out pipes to the indoor
unit.
2 Connect the domestic hot water in and out pipes to the indoor
unit.
a2
a1
b2
b1
a1
Space heating/cooling – Water IN (screw connection, 1")
a2
Space heating/cooling – Water OUT (screw connection,
1")
b1
DHW – Cold water IN (screw connection, 3/4")
b2
DHW – Hot water OUT (screw connection, 3/4")
3 Install the following components (field supply) on the cold water
inlet of the DHW tank:
a
b2
a
Shut-off valve (recommended)
b1
DHW – Cold water IN (screw connection, 3/4")
b2
DHW – Hot water OUT (screw connection, 3/4")
c
Non-return valve (recommended)
d
Pressure reducing valve (recommended)
*e
Pressure relief valve (max. 10 bar (=1.0 MPa))
(mandatory)
*f
Tundish (mandatory)
g
Expansion vessel (recommended)
NOTICE
▪ It is recommended to install shut-off valves on the
space heating/cooling water in and out connections, as
well as on the domestic cold water in and domestic hot
water out connections. These shut-off valves are field
supplied.
▪ However, make sure there is no valve between the
pressure relief valve (field supply) and the DHW
tank.
*e
*f
d
c
a
g
b1
EHFH03S18D
Daikin Altherma 3 R F
4P596803-1D – 2022.08
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