Daikin Altherma 3 H HT EPRA18DAV3, Руководство по установке для специалистов

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7 | Piping installation
Installer reference guide
82
EPRA14~W1 + ETVH/9W(G)
Daikin Altherma 3 H HT F
4P587502-1B – 2020.12
7.2.4 To connect the recirculation piping
Prerequisite: Only required if you need recirculation in your system.
1 Remove the top panel from the unit, see "To open the indoor unit" [
4
60].
2 Cut out the rubber grommet on top of the unit, and remove the stop. The
recirculation connector is placed below the hole.
3 Route the recirculation piping through the grommet and connect it to the
recirculation connector.
4 Reattach the top panel.
7.2.5 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.
7.2.6 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
183]),
▪ 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.