General
Pipe installation must be carried out in accordance with
current norms and directives.
Internal support bushes should be fitted when a plastic
pipe or annealed copper pipe is used. The water heater
must be fitted with the requisite valves, such as a safety
valve, shut-off valve, non-return valve, and vacuum valve.
An overflow pipe must be routed from the safety valve
to a suitable drain. The size of the overflow pipe must be
the same as on the safety valve. Route the overflow pipe
from the safety valve enclosed along its entire length and
ensure that it is frost proof. The outlet of the overflow
pipe should be visible and clearly away from any electrical
components.
Overflow water from the safety valves goes via non-
pressurised collecting pipes to a drain so that hot water
splashes cannot cause injury. These non-pressurised col-
lecting pipes shall not be used for anything else. A dis-
charge pipe from the tundish connected to the expansion
relief valve (safety valve) shall also be connected to a drain
in the same way.
Please note that the connection of the T&P-valve should
not be used for any other purpose.
Valves may not be positioned between the expansion
valve and the vessel.
Discharge pipes from tundishes shall have av vertical
section of pipe at least 300 mm long, before any elbows
or bends in the pipework (see following picture).
600 mm maximum
Tundish
Metal discharge pipe from
temperature relief valve to tundish.
Safety device
(e.g. temperature
relief valve).
300 mm
minimum
Metal discharge pipe from tundish,
with continous fall.
Possible wall
Discharge below
fixed grating.
Trapped gulley
Fixed grating
NOTE
The expansion vessel accomodates expansion
that results from heating the water inside the
unit. The expansion vessel must be connected
between the expansion valve and the cylinder.
The location of the expansion vessel should allow
access to recharge the pressure as and when
necessary.
Resistance created by
each elbow or bend
Maximum resistance
allowed, expressed
as a lenght of
straight pipe (i.e. no
elbows or bends)
Minimum size of dis-
charge pipe from
tundish
Minimum size of dis-
charge pipe
Valve outlet size
0.8 mmup to 9 m22 mm15 mmG1/2
1.0 mmup to 18 m28 mm15 mmG1/2
1.4 mmup to 27 m35 mm15 mmG1/2
1.0 mmup to 9 m28 mm22 mmG3/4
1.4 mmup to 18 m35 mm22 mmG3/4
1.7 mmup to 27 m42 mm22 mmG3/4
1.4 mmup to 9 m35 mm28 mmG1
1.7 mmup to 18 m42 mm28 mmG1
2.3 mmup to 27 m54 mm28 mmG1
Hard water areas
Usually, there should not be a problem in installing
VPB/VPBS in areas of hard water as the operating temper-
ature is 50-60 °C.
Cleaning the climate system
When the water heater and the climate system have been
filled with water, VPB/VPBS must operate at maximum
normal temperature for at least one hour. Thereafter the
system must be drained of water and refilled.
VPB/VPBS UKChapter 4 | Pipe connections10
4 Pipe connections
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