To Connect A Pressure Vessel; To Fill The Heating System - Daikin EPRA10EAV3 Installer's Reference Manual

8.2.4 To connect a pressure vessel

8.2.5 To fill the heating system

EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
NOTICE
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A drain device and pressure relief device must be installed on the cold water inlet
connection of the storage tank.
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To avoid back siphonage, it is recommended to install a non-return valve on the
water inlet of the storage tank in accordance with the applicable legislation.
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It is recommended to install a pressure reducing valve on the cold water inlet in
accordance with the applicable legislation.
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An expansion vessel should be installed on the cold water inlet in accordance
with the applicable legislation.
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It is recommended to install the pressure relief valve on a higher position than
the top of the storage tank. Heating of the storage tank causes water to expand
and without pressure relief valve the water pressure of the domestic hot water
heat exchanger inside the tank can rise above 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, water leakage may occur. To
confirm good operation, regular maintenance is required.
1 Connect a suitably dimensioned and preset pressure vessel for the heating
system. There may not be any hydraulic blocking elements between the heat
generator and the safety valve.
2 Position the pressure vessel in an easily accessible place (maintenance, parts
replacement).
DANGER: RISK OF ELECTROCUTION
During the filling process, water can escape from any leaking point and can cause an
electrical shock if it comes into contact with live parts.
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Before the filling process, de-energise the unit.
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After the first filling and before switching on the unit with the mains switch, check
whether all electric parts and connection points are dry.
1 Connect a hose with a non-return valve (1/2") and an external manometer
(field supply) to a water tap and the fill and drain valve. Secure the hose
against slipping off.
8 Piping installation
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Installer reference guide
95