Daikin ALTHERMA, Installer'S Reference Manual

Page: 82 / 280

8 | Piping installation
Installer reference guide
82
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
4P620241-1 – 2020.06
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 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
200]),
▪ 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.
▪ Install freeze protection valves. Freeze protection valves drain the water from
the system before it can freeze.
NOTICE
If you add glycol to the water, do NOT install freeze protection valves. Possible
consequence: Glycol leaking out of the freeze protection valves.
NOTICE
If you add glycol to the water, you also need to install a flow switch (EKFLSW1).
Freeze protection by glycol
About freeze protection by glycol
Adding glycol to the water lowers the freezing point of water.
WARNING
Ethylene glycol is toxic.