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STV2I ed 11/09
VICTRIX 2 I Export
Technical Documentation
Technical Documentation
Safety devices and controls for central heating
only versions.
System automatic by-pass (4).
Guarantees the circulation of water in the primary circuit
(
between flow and return
) also when the high resistance of the
system does not allow it.
It is mounted between the pump body and the 3-way valve
group.
It can be inserted or excluded by the screw (4) accessed from the
front. With the cut on the head of the screw in horizontal posi-
tion, the by-pass is inserted (
open
), with the cut on the head of
the screw in vertical position; the by-pass is excluded
(closed)
.
System filing unit (7).
It is a ball valve positioned between the boiler circuit and the
domestic cold water inlet that allows to pressurise the CH
system.
The cock is connected to a filling fitting (6), which is then
connected to the pump body (2).
System flow switch (5).
When faced with circulation of water with a flow rate of at least
400 l/h, the system flow switch (5) enables boiler functioning.
This takes place by means of a disc connected to a micro switch,
which, on lifting when it is hit by the flow of water, closes the
electric contact.
The closure of the contact, which is positioned out of the pipe
where the water passes, allows the integrated P.C.B. to start
boiler functioning.
The flow switch (5) is push-fitted onto the system return pipe
(
heat exchanger flow
) and blocked by two relevant shaped clips.
The body is made up of two plastic parts that are fixed to each
other by two self-threading screws.
Automatic air vent valve (1).
Allows the automatic expulsion of the gaseous substances that
may be present in the boiler circuit.
It is mounted on the pump directly on the body (2).
3 bar safety valve (3).
Prevents the safety pressure in the primary circuit from being
exceeded (3 bar).
It is engaged into the front part of the pump body (2) and is
fixed using a clip.
Its intervention causes water to escape from the boiler return.
System expansion vessel (8).
It compensates the volume variation consequent to heating the
water, thus limiting the pressure variations.
It has a capacity of 8 litres (
useful 5.7 litres
) and a factory-set
pressure of 1.0 bar.
It is positioned on the right side of the boiler at the side of the se-
aled chamber and is connected to the filling fitting (6) by means
of a copper pipe, which is connected to the pump body (2).
8
3
4
1
2
6
7
5
2
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