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Piping installation
Installer reference guide
94
NOTICE
To avoid damage to the surroundings in case of water leakage, it is recommended to
close the domestic cold water inlet shut‑off valves during periods of absence.
NOTICE
A pressure relief valve 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
"8.1.3 To check the water volume and flow
▪
Mind the minimum flow rate when adjusting the differential pressure bypass
valve setting. See
"8.1.3 To check the water volume and flow
"11.4.1 Minimum flow
rate" [
NOTICE
Install air purge valves at all local high points.
4
rate" [
88].
4
234].
rate" [
4
88] and
EPRA14~18D + ETVH16SU18+23E
Daikin Altherma 3 H HT F
4P644738-1D – 2023.10
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