Table of Contents
9 Installation
b
Water outlet (G1")(going to the gas boiler in case of
NHY2KOMB28+32AA gas boiler)
c1~c3
Parts of option EKBALLV1
c1: O-rings
c2: Shut‑off valve
c3: Shut‑off valve with integrated connection for the
vacuum breaker (if applicable)
1 Connect the O-rings and shut-off valves.
2 Connect the field piping on the shut-off valves.
3 In case of connection with the optional domestic hot water tank,
see the installation manual of the domestic hot water tank.
NOTICE
In case of a third-party gas boiler: Install a manometer in
the system.
NOTICE
Install air purge valves at all local high points.
NOTICE
In case an optional domestic hot water tank is installed: A
pressure relief valve (field supply) with an opening
pressure of maximum 10 bar (= 1 MPa) must be installed
on the domestic cold water inlet connection in accordance
with the applicable legislation.
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.
To provide drainage for the pressure relief valve
NOTICE
If overpressure occurs, the system will release some of the
liquid through the pressure relief valve. The pressure relief
valve of the outdoor unit is designed to open at 3 bar.
If glycol was added to the system, take adequate
measures to safely recover it when the pressure relief
valve opens.
In any case, make sure that the flexible hose of the
pressure relief valve is ALWAYS free to release pressure.
Installer reference guide
36
a
Pressure relief valve
b
Flexible hose (drain)
1 Open the top plate, front plate, and rear plate. See
open the outdoor unit" on
page 30.
2 Make a cross-cut in the rubber grommet on the rear plate.
3 Route the flexible hose through the grommet.
4 Close the rear plate.
5 Pull the flexible hose with a light force to make sure that the
flexible hose slopes down. This prevents water from staying
and/or freezing inside the hose.
6 Close the front plate and top plate.
7 If glycol was added to the system, take adequate measures to
safely recover it when the pressure relief valve opens.
9.6.4
Connecting the water piping of the gas
boiler
To connect the water piping for domestic hot
water (not applicable for Switzerland)
1 Flush the installation thoroughly to clean.
a
b
a
Domestic hot water outlet
b
Cold water inlet
c
Pressure relief valve (field supply)
2 Install a pressure relief valve according to local and national
regulations (if required).
3 Connect the hot water connection (Ø15 mm).
4 Connect the main cold water connection (Ø15 mm).
a b
"9.2.2 To
c
EJHA04AAV3 + NHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05
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