To Protect The Water Circuit Against Freezing - Daikin Altherma 3 H MT ECH2O Installer's Reference Manual

8 | Piping installation

8.2.6 To protect the water circuit against freezing

About freeze protection
Freeze protection by glycol
Installer reference guide
96
c Space heating/cooling water OUT
d Space heating/cooling water IN
e.1 Valve motor
e.2 Valve motor latch
f Water tap
g Automatic air purge valve
h Pressure gauge (field supply)
i Pressure vessel (field supply)
j Bypass valve
k Tank valve
2 Prepare for air purging according to the instructions (see
of the unit with the manual air vent
3 Open the water tap.
4 Open fill and drain valve and monitor the manometer.
5 Fill the system with water until the external manometer shows that the
system target pressure is reached (system height +2 m; 1 m water column =
0.1 bar). Make sure that the pressure relief valve does not open.
6 Close the manual air vent valves as soon as water emerges free of bubbles.
7 Close the water tap. Keep the fill and drain valve open in case it is necessary to
repeat the filling procedure after the air purging of the system. See
4
purge function" [
8 Close the fill and drain valve and remove the hose with non-return valve only
after air purging is performed and the system is completely filled.
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.
▪ Install freeze protection valves. Freeze protection valves drain the water from
the system before it can freeze. Insulate the freeze protection valves in a similar
way as the water piping, but do NOT insulate the inlet and outlet (release) of
these valves.
NOTICE
If you add glycol to the water, do NOT install freeze protection valves. Possible
consequence: Glycol leaking out of the freeze protection valves.
About freeze protection by glycol
Adding glycol to the water lowers the freezing point of water.
valves" [
236].
"Water pipe freeze
"To purge the air out
4
237]).
4
prevention" [ 209]),
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1 – 2021.07
"11.4.2 Air