Daikin Altherma 3 H HT ETSX16E7, Руководство по установке для специалистов

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8 | Piping installation
Installer reference guide
98
EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
4P679467-1B – 2022.09
5 Fill the system with water until the external manometer shows that the
system target pressure is reached (system 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
"11.4.2 Air
purge function" [
4
240].
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.
8.2.6 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
212]),
▪ 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.
Freeze protection by glycol
About freeze protection by glycol
Adding glycol to the water lowers the freezing point of water.
WARNING
Due to the presence of glycol, corrosion of the system is possible. Uninhibited glycol
will turn acidic under the influence of oxygen. This process is accelerated by the
presence of copper and high temperatures. The acidic uninhibited glycol attacks
metal surfaces and forms galvanic corrosion cells that cause severe damage to the
system. Therefore it is important that:
▪
the water treatment is correctly executed by a qualified water specialist,
▪
a glycol with corrosion inhibitors is selected to counteract acids formed by the
oxidation of glycols,
▪
no automotive glycol is used because their corrosion inhibitors have a limited
lifetime and contain silicates which can foul or plug the system,
▪
galvanized pipes are NOT used in glycol systems since the presence may lead to
the precipitation of certain components in the glycol's corrosion inhibitor.