Daikin EKHWSU180D3V3 [9/24] Precautions when connecting the water piping
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Daikin EKHWSU180D3V3 [9/24] Precautions when connecting the water piping

Daikin EKHWSU180D3V3 [9/24] Precautions when connecting the water piping
6 Installation
Installation manual
9
EKHWSU150~300D3V3 + EKEXPVES
Domestic hot water tank with option kit for air to water heat pump
system
4P510673-1B – 2018.01
6.4.2 Precautions when connecting the water
piping
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
6.4.3 To connect the water piping
394 mm
127 mm
>300 mm
D1
D1
D2
R
F
10
3
2
6
1
7
5
8
H
4
5
9
C
a
b
a Fixed grating
b Trapped effluent water
Discharge piping requirements
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
▪ Where the secondary return circuits are used, an
additional expansion vessel may be required.
▪ 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.
Sizing of copper discharge pipe D2 for common temperature relief
valve outlet sizes:
Valve outlet size Discharge pipe
size D1
Discharge pipe
size D2 from
tundish
Maximum
resistance
(a)
Resistance
created by each
elbow or bend
15mm 15mm 22mm Up to 9m 0.8m
(a) The maximum allowed resistance is expressed as a length
of straight pipe (i.e. no elbows or bends)
If in any doubt, refer to Building Regulation G3.
Before installation
Locate the domestic hot water tank in a suitable position to facilitate
the installation of water supply, discharge fittings and pipework. It is
therefore recommended to first read through this whole procedure.
In the box all the needed components for G3-compliance have been
installed from the factory.
Only the following steps need to be performed:
▪ Make the connection of the G3-kit to the cylinder.
▪ Connect the tundish to an effluent water connection.
▪ Connect the expansion vessel (if required).
Installation procedure of the G3 kit
1 Install the clamps to support the G3 kit. The number of clamps
and mounting distances depend on the tank size, see
illustration and table below.
A B C
Tank size (L) 150 180 200 250 300
# of clamps 2 2 3 3 3
A 370mm 370mm 370mm 370mm 370mm
B 408mm 570mm 340mm 350mm 560mm
C — — 335mm 560mm 590mm

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