8 | Piping installation
Installer reference guide
114
ERLA11~16D + EBBH/X11+16D
Daikin Altherma 3 R W
4P643603-1B – 2022.05
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 "8.5.3To
check the water volume and flow rate"[4109].
▪ Mind the minimum flow rate when adjusting the overpressure bypass valve
setting. See "8.5.3 To check the water volume and flow rate" [4 109] and
"12.4.1Minimum flow rate"[4253].
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
In case an optional domestic hot water tank is installed: A pressure relief valve (field
supply) with an opening pressure of maximum 10bar (=1MPa) must be installed on
the domestic cold water inlet connection in accordance with the applicable
legislation.
NOTICE
In case an optional domestic hot water tank is installed:
▪ 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.
8.6.4 To fill the water circuit
To fill the water circuit, use a field supply filling kit. Make sure you comply with the
applicable legislation.
NOTICE
Pump. To prevent blocking of the pump rotor, commission the unit as quickly as
possible after filling the water circuit.
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