6 VPA 300/200, 450/300
For the Installer
Pipe connections
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 nonpressu-
rised collecting pipes to a drain so that hot water splashes
cannot cause injury. These non-pressurised collecting pipes
shall not be used for anything else. A discharge 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 sec-
tion of pipe at least 300 mm long, before any elbows or
bends in the pipework (see following picture).
600 mm maximum
Matal discharge pipe from tundish,
with continous fall.
300 mm
minimum
Tundish
Safety device
(e.g. temperature
relief valve)
Metal discharge pipe from
temperature relief valve to tundish
Possible wall
Discharge below
fixed grating
Fixed grating
Trapped gulley
Valve outlet size Minimum size of
discharge pipe
Minimum size of
discharge pipe from
tundish
Maximum resistance
allowed, expres-
sed as a length of
straight pipe (i.e. no
elbows or bends)
Resistance created
by each elbow or
bend
G1 / 2 15 mm 22 mm up to 9 m 0,8 m
G1 / 2 15 mm 28 mm up to 18 m 1,0 m
G1 / 2 15 mm 35 mm up to 27 m 1,4 m
G3 / 4 22 mm 28 mm up to 9 m 1,0 m
G3 / 4 22 mm 35 mm up to 18 m 1,4 m
G3 / 4 22 mm 42 mm up to 27 m 1,7 m
G1 28 mm 35 mm up to 9 m 1,4 m
G1 28 mm 42 mm up to 18 m 1,7 m
G1 28 mm 54 mm up to 27 m 2,3 m
Pipe connections
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.
Hard water areas
Usually, there should not be a problem in installing VPB/
VPBS in areas of hard water as the operating temperature
is 50-60 °C.
Cleaning the system
When the water heater and the climate system have been
filled with water, VPA must operate at maximum normal
temperature for at least one hour. Thereafter the system
must be drained of water and refilled.
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