Daikin Altherma 3 H MT W - To Fill the Water Circuit; To Protect the Water Circuit against Freezing

8 | Piping installation
Installer reference guide
91
EPRA08~12EAV3+W1 + ETBH/X12EF6V+9W
Daikin Altherma 3 H MT W
4P634885-1 – 2021.03
a Water IN (screw connection, 1")
b Space heating water OUT (screw connection, 1")
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 "8.1.3To
check the water volume and flow rate"[486].
▪ Mind the minimum flow rate when adjusting the overpressure bypass valve
setting. See "8.1.3 To check the water volume and flow rate" [4 86] and
"11.4.1Minimum flow rate"[4230].
NOTICE
Install air purge valves at all local high points.
NOTICE
In case an optional domestic hot water tank is installed: 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.
8.2.4 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
Make sure both air purge valves (one on the magnetic filter and one on the backup
heater) are open.
All automatic air purge valves MUST remain open after commissioning.
8.2.5 To protect the water circuit against freezing
About freeze protection
Frost can damage the system. To prevent the hydraulic components from freezing,
the software is equipped with special frost protection functions, that include the
activation of pump in case of low temperatures:
▪ Water pipe freeze prevention (see "Water pipe freeze prevention"[4203]),
▪ Drain prevention. Only applicable when Bivalent is enabled ([C‑02]=1). This
function prevents the opening of freeze protection valves in the water piping to
the outdoor unit when the auxiliary boiler is running at negative outdoor
temperatures.
However, in case of a power failure, these functions cannot guarantee protection.
Do one of the following to protect the water circuit against freezing: