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5.3.2
To connect the water piping for domestic
hot water
a
e
c
e
a
Pressure reducing valve/pressure relief valve
combination. Water inlet and water outlet 22 mm
connection, discharge piping connection 15 mm
b
Adaptor 22 mm×3/4" Female BSP
c
T-piece 22 mm×22 mm×22 mm
d
Expansion vessel of 18 l or 8 l – 3/4" Male BSP
e
Tundish 15 mm inlet, 22 mm outlet
1 Pre-assemble the adaptor and expansion vessel so that the
expansion vessel is ready for installation.
2 Mount the expansion vessel to the wall.
EWSAH/X06UD
Daikin Altherma 3 WS
4P675760-1C – 2023.02
d
b
1
3 Fit the T-piece (part of the kit) to the domestic hot water cold
water IN pipe of the unit.
4 Connect the pressure reducing valve/pressure relief valve
combination (part of the kit) to the T-piece with a length of
copper tube Ø22 mm (field supply).
5 Connect the expansion vessel to the T-piece with a length of
copper tube Ø22 mm (field supply).
6 Connect the pressure reducing valve/pressure relief valve
combination to the water mains inlet.
7 Install the tundish (part of the kit) in a vertical position within a
maximum of 600 mm away from the pressure reducing valve/
pressure relief valve combination.
WARNING
Install the tundish away from any electrical device.
Possible consequence: Electrical 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.
8 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 and temperature 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.
5 Piping installation
2
c
d
Installation manual
13
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