Connecting The Water Piping Of The Gas Boiler - Daikin Altherma EVLQ05+08CA Installer's Reference Manual

7.10.4 Connecting the water piping of the gas boiler

To connect the water piping for space heating
EVLQ05+08CAV3 + EHYHBH05AF + EHYHBH/X08AF + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1F – 2020.10
NOTICE
In case an optional domestic hot water tank is installed:
▪
A drain device and pressure relief device must be installed on the cold water inlet
connection of the domestic hot water cylinder.
▪
To avoid back siphonage, it is recommended to install a non-return valve on the
water inlet of the domestic hot water tank in accordance with the applicable
legislation.
▪
It is recommended to install a pressure reducing valve on the cold water inlet in
accordance with the applicable legislation.
▪
An expansion vessel should be installed on the cold water inlet in accordance
with the applicable legislation.
▪
It is recommended to install the pressure relief valve on a higher position than
the top of the domestic hot water tank. Heating of the domestic hot water tank
causes water to expand and without pressure relief valve the water pressure
inside the tank can rise above the tank 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, overpressure will deform
the tank and water leakage may occur. To confirm good operation, regular
maintenance is required.
Use the straight brass fitting connections (accessory of the heat pump unit).
1 The space heating piping of the boiler will be connected to the indoor unit.
2 Install the straight brass fitting connections so that they perfectly match the
connection of both modules.
3 Tighten the straight brass fitting connections.
a b
a Outlet space heating
b Inlet space heating
7 Installation
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Installer reference guide
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