To Connect The Recirculation Piping; To Fill The Domestic Hot Water Tank - Daikin R32 Split Series Installer's Reference Manual

8.4.4 To connect the recirculation piping

8.4.5 To fill the domestic hot water tank

EKHWET90~120BAV3
R32 Split series – Domestic hot water tank
4P680077-1 – 2021.11
a b
a DHW – hot water OUT (screw connection, ½")
b DHW – cold water IN (screw connection, ½")
NOTICE
▪
A pressure relief device must be installed on the cold water inlet connection of
the storage tank.
▪
To avoid back siphonage, it is recommended to install a non-return valve on the
water inlet of the storage 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 storage tank. Heating of the storage tank causes water to expand
and without pressure relief valve the water pressure of the domestic hot water
heat exchanger inside the tank can rise above 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, water leakage may occur. To
confirm good operation, regular maintenance is required.
NOTICE
A pressure relief valve (field supply) with an opening pressure of maximum 7 bar
(=0.7 MPa) must be installed on the domestic cold water inlet connection in
accordance with the applicable legislation.
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.
If recirculation is required in your system, the water return to the tank must be
from the cold water inlet.
A check valve must be installed to prevent water return to the supply system
1 Open every hot water tap in turn to purge air from the system pipe work.
2 Open the cold water supply valve.
3 Close all water taps after all air is purged.
4 Check for water leaks.
8 Piping installation
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Installer reference guide
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