4 Piping installation
Installation manual
13
EWSAH/X06UDA9W
Daikin Altherma 3 WS
4P675760-1 – 2021.10
1
2
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):
≤600 mm
≥300 mm
a
D1
D2
c
b
d
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.
9
After completing the installation, the installer has to fill out the
warning label on the tank with indelible ink. The warning label
can be found on the unit top plate.
WARNING
The discharge pipes from the pressure relief valves MUST
terminate in a safe and visible position without forming any
risk to persons in the vicinity.
WARNING
▪ Discharge piping, tundish, drain valves, etc. MUST be
positioned away from any electrical components.
▪ The discharge pipe away from the tundish MUST
terminate in a safe, visible position without forming any
risk to persons in the vicinity.
WARNING
▪ Do NOT install any valves between the domestic hot
water tank and relief valves/expansion vessel.
▪ Do NOT install shut-off valves between the expansion
relief valve and the domestic hot water tank.
NOTICE
▪ All pipework and fittings must be flushed free of flux
and debris prior to installing the domestic hot water
tank kit. Failure to do this may cause irreparable
damage to the tank kit controls. Flush the system by
opening the hot water tap.
▪ The tundish pipework must be a 22 mm metal pipe with
a minimal vertical length of 300 mm below the tundish
before any elbows or bends in the pipework. All
pipework must have a continuous fall of 1 in 200
thereafter. Maximum permitted (equivalent) length of
22 mm pipework is 9 m. Each bend or elbow is
equivalent to 0.8 m of pipework.
4.3.3
To connect the recirculation piping
Prerequisite:
Only required if you need recirculation in your system.
1
Remove the top panel from the unit, see
2
Cut out the rubber grommet on top of the unit, and remove the
stop. The recirculation connector is located below the space
heating/cooling water outlet pipe.
3
Route the recirculation piping through the grommet and connect
it to the recirculation connector.
