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I
NSTALLATION OF THE OPTION KIT ON THE DOMESTIC HOT WATER TANK
All pipework and fittings must be flushed free of all flux and debris prior to the fitting of controls of this option kit. Failure to do this
may cause irreparable damage to the controls.
All cautions as under chapter "Installation of the EKHWSU domestic hot water tank" on page 2 remain of extreme importance and
are equally valid in this chapter.
6
H
Piping requirements
Tundish
Install the tundish in a vertical position within a maximum of
500 mm away from the temperature and pressure relief valve on
the domestic hot water tank and the expansion relief valve
included in the option kit.
Tundish pipework
Tundish pipework must be 22 mm metal pipe with a minimum
vertical length of 300 mm below the tundish. Maximum permit-
ted (equivalent) length of 22 mm pipework is 9 m. Each bend or
elbow is equivalent to 0.8 m of pipework.
All pipework must have a continuous fall.
Installation manual
9
8
2
3
≤5 00 m m
≤5 00 m m
8
EKUHW2WB
14
F
14
8
8
R
C
7
D1
11
D1
12
4
10
D2
13
9
15
Sizing of copper discharge pipe D2 for common temperature
relief valve outlet sizes
Valve
Discharge pipe
outlet
Discharge pipe
size D2
size
size D1
from tundish
15 mm
15 mm
22 mm
Requirements to discharges
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.
If in any doubt, refer to Building Regulation G3.
Do not install any valves between the domestic hot
water tank and relief valves/expansion vessel.
EKUHWB + EKUHW2WB + EKHWSU150-300B3V3
Domestic hot water tank with option kit for air to
5
Fixed grating
Trapped
effluent water
Maximum
resistance
allowed,
expressed as a
Resistance
length of straight
created by
pipe (i.e. no
each elbow
elbows or bends)
or bend
up to 9 m
0.8 m
water heat pump system
4PW44439-1D – 02.2011
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