Daikin ERLA11D V3 Series Installer's Reference Manual page 110

8 | Piping installation
Installer reference guide
110
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 (mandatory)
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
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 (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 must be installed on the cold water inlet.
▪
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.
ERLA11~16D + EBVH/X11+16S18+23D
Daikin Altherma 3 R F
4P643602-1B – 2022.05