To Fill The Water Circuit; To Protect The Water Circuit Against Freezing - Daikin ETBH16E9W Installer's Reference Manual

8.2.4 To fill the water circuit

8.2.5 To protect the water circuit against freezing

About freeze protection
EPRA14~18D + ETBH/X16E
Daikin Altherma 3 H HT W
4P644736-1D – 2023.10
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. Make sure it is NOT between the pressure relief valve and the DHW
tank.
▪
It is recommended to install a pressure reducing valve on the cold water inlet in
accordance with the applicable legislation.
▪
It is recommended to install an expansion vessel 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.
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.
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
▪ 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:
▪ Add glycol to the water. Glycol lowers the freezing point of the water.
8
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"Water pipe freeze prevention" [
Piping installation
4
210]),
Installer reference guide
95