Daikin Altherma 3 H HT F Installer's Reference Manual page 94

8 | 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
Overpressure bypass valve (delivered as accessory). We recommend to install the
overpressure bypass valve in the space heating water circuit.
▪
Mind the minimum water volume when choosing the installation location of the
overpressure bypass valve (at the indoor unit, or at the collector). See
check the water volume and flow
▪
Mind the minimum flow rate when adjusting the overpressure 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.
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.
▪
It is recommended to install a pressure reducing valve on the cold water inlet in
accordance with the applicable legislation.
▪
An expansion vessel should be installed 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.
rate" [ 4 88].
4
232].
"8.1.3 To
4
rate" [ 88] and
EPRA14~18D + ETVH16SU18+23E
Daikin Altherma 3 H HT F
4P644738-1A – 2022.03