Page 19
User, Installations and Maintenance Manual
ATTENTION!
▪
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 with-
out forming any risk to persons in the vicinity.
ATTENTION!
▪ Do NOT install any valves between the domestic
hot water tank and relief valves/expansion vessel..
▪ Do NOT install shut-off valves between the ex
-
pansion relief valve and the domestic hot water
tank.
NB!:
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. Maxi-
mum permitted (equivalent) length of 22 mm pipework is
9 m. Each bend or elbow is equivalent to 0.8 m of pipe-
work.
The following figures (fig. 23 - fig. 24) illustrate 3 examples of
hydraulic connection.
11
11
10
15
12
10
17
PRSV
>3°
9
5
OUT
IN
1
16
11
13
14
4
29
17 11
fig. 23 - Example of water system WITHOUT thermostatic mixing valve
5
16
11
18
11
17
17
17
29
4
11
OUT
11
11
10
15
12
10
17
PRSV
>3°
9
IN
1
13
14
fig. 24 - Example of water system WITH thermostatic mixing valve
Legend (fig. 23 - fig. 24)
1 Water inlet pipe
4 Ricirculation water inlet
5 Hot water outlet pipe
9 Inspectionable end of di-
scharge pipe
10 Pressure gauge
11 Shut-off valve
12 Pressure regulator
13 Shut-off valve
14 Expansion vessel
15 Drain tap
16 Recirculation pump
17 Check valve
18 Automatic thermostat mixing
equipment
29 T/p relief safety valve (factory
installed)
PRSV Pressure reducing valve/
pressure relief valve combi-
nation
- - - when the circulation pump is
working
NOTE: All piping MUST be installed according to section
G3 of the Building Regulations.
