To Connect The Pressure Relief Valve To The Drain; To Fill The Water Circuit - Daikin Altherma EHVH08SU18CB6W Installer's Reference Manual

180 l
WARNING
Install the tundish away from any electrical device.
Possible consequence: Electric shock or fire.
NOTICE
To ensure a free water flow through the discharge pipe,
manually operate the pressure relief valve by turning its
knob left.
9 Connect the 2 tundishes (1 from the pressure relief valve of the
domestic hot water tank, and 1 from the pressure relief valve of
the domestic hot water tank kit) to an appropriate drain
according to the applicable legislation. The following example
shows discharge below fixed grating (Building Regulation G3
section 3.61 gives alternative points of discharge):
a
D1
≤600 mm
b
≥300 mm
D2
a Safety device (pressure relief valve of domestic hot water
tank; pressure relief valve of domestic hot water tank kit)
b Tundish
c Fixed grating
d Trapped gully
D1 Metal discharge pipe from safety device to tundish
D2 Discharge pipe from tundish, with continuous fall. See
Building Regulation G3 section 3.56, Table 03 and worked
example.
NOTICE
Install air purge valves at all local high points.
NOTICE
▪ 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.
ERLQ004~008CA + EHVH04+08SU18+26CB6W
Daikin Altherma – Low temperature split
4P449978-1B – 2018.07
260 l
7.8.5
The blow out of the pressure relief valve is coming out of the
backside of the unit.
a
The blow out should be connected to an appropriate drain according
to the applicable legislation. It is recommended to use a tundish.
7.8.6
c
1 Connect the water supply hose to the fill valve.
d
2 Open the fill valve.
3 Make sure that the automatic air purge valve is open (at least 2
turns).
4 Fill the circuit with water until the manometer indicates a
pressure of ±2.0 bar.
5 Purge as much air as possible from the water circuit.
6 Close the fill valve.
7 Disconnect the water supply hose from the fill valve.
To connect the pressure relief valve to the
drain
INFORMATION
Heating of the domestic hot water tank causes water to
expand. As a result, 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 can then become subjected to this high pressure. To
prevent overpressure, a pressure relief valve is factory-
installed on top of the domestic hot water tank. The
prevention depends on the correct operation of the
pressure relief valve. If it does NOT function correctly,
overpressure will deform the tank and water leakage may
occur. To confirm correct operation, regular maintenance is
required.
a Pressure relief blow-out

To fill the water circuit

NOTICE
The water pressure indicated on the manometer will vary
depending on the water temperature (higher pressure at
higher water temperature).
However, at all times water pressure shall remain above
1 bar to avoid air entering the circuit.
7 Installation
Installer reference guide
41