5 Piping installation
Installation manual
8
ETVH/23E
Daikin Altherma 3 H HT F
4P644728-1D – 2022.08
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.
To facilitate service and maintenance, 4 shut-off valves and 1
differential pressure bypass valve are provided. Mount the shut-off
valves on the space heating water IN/OUT connections, and on the
water IN/OUT connections from/to the outdoor unit. To ensure the
minimum flow rate (and prevent overpressure), install the differential
pressure bypass valve on the space heating water outlet.
1
Connect the O-rings and shut-off valves to the outdoor unit
water connection pipes of the indoor unit.
2
Connect the outdoor unit field piping to the shut-off valves.
3
Connect the O-rings and shut-off valves to the space heating/
cooling water pipes of the indoor unit.
4
Connect the space heating/cooling field piping to the shut-off
valves.
5
Connect the domestic hot water in and out pipes to the indoor
unit.
b1
b2
a1
a2
c2
c1
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")
c1
Water IN from outdoor unit (screw connection, 1")
c2
Water OUT to outdoor unit (screw connection, 1")
6
Install the following components (field supply) on the cold water
inlet of the DHW tank:
g
c
b1
b2
d
a
*e
*f
a
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 to 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.
NOTICE
A pressure relief valve (field supply) with an opening
pressure of maximum 10 bar (=1 MPa) must be installed
on the domestic cold water inlet connection in accordance
with the applicable legislation.
NOTICE
▪ A drain device and pressure relief device must be
installed on the cold water inlet connection of the
domestic hot water cylinder.
▪ To avoid back siphonage, it is recommended to install a
non-return valve on the water inlet of the domestic hot
water tank in accordance with the applicable legislation.
Make sure it is NOT between the pressure relief valve
and the DHW tank.
▪ It is recommended to install a pressure reducing valve
on the cold water inlet in accordance with the
applicable legislation.
▪ It is recommended to install an expansion vessel on the
cold water inlet in accordance with the applicable
legislation.
▪ It is recommended to install the pressure relief valve on
a higher position than the top of the domestic hot water
tank. Heating of the domestic hot water tank causes
water to expand and without pressure relief valve the
water pressure inside the tank can rise above the tank
design pressure. Also the field installation (piping,
tapping points, etc.) connected to the tank is subjected
to this high pressure. To prevent this, a pressure relief
valve needs to be installed. The overpressure
prevention depends on the correct operation of the field
installed pressure relief valve. If this is NOT working
correctly, overpressure will deform the tank and water
leakage may occur. To confirm good operation, regular
maintenance is required.
NOTICE
Differential
pressure bypass valve
(delivered as
accessory). We recommend to install the differential
pressure bypass valve in the space heating water circuit.
▪ Mind the minimum water volume when choosing the
installation location of the differential pressure bypass
valve (at the indoor unit, or at the collector). See
"5.1.1 To check the water volume and flow rate"
▪ Mind the minimum flow rate when adjusting the
differential pressure bypass valve setting. See
"5.1.1 To check the water volume and flow rate"
and
"8.2.1 To check the minimum flow rate"
NOTICE
Install air purge valves at all local high points.
