Immergas VICTRIX 75 - Primary Heat Exchanger and Safety Devices; Condensation Module Details; Safety Devices and Controls

7
STV75 ed 01/08 VICTRIX 75
Primary heat exchanger
(condensation module).
It consists of a casing containing 12 coil shaped elements.
Each element is made of 5 elliptic pipe spirals (3).
e whole module is made of stainless steel. e lower sec-
tion is the sealed combustion chamber while the top is the
condensation chamber (4).
e eight lower elements are heated directly by the cylindrical
burner, while the top four are located inside the condensation
chamber (4) which is separated from the combustion chamber
by a metal plate (see the ue circuit).
To minimise head losses and increase the ow available for
the system, the ow consists of the parallel connection of six
elements while the return consists of the parallel connection
of the remaining six elements.
e exchanger inlet is connected to the boiler pump ow on
which the system return NTC probe is positioned (6) while the
outlet, on which the system ow (7) NTC probe is positioned,
is connected to the primary circuit ow.
readed ttings and a at seals are used to couple the ow
and return pipes of the primary circuit.
e overheating safety thermostat (1) is installed on the system
ow pipe.
e ue hood (5) is connected to the top of the module by a
seal and fastened to the supporting frame by screws.
Condensation is runo from the bottom.
Safety devices and controls.
System pressure switch (2).
is switch detects the pressure inside the primary circuit.
It is housed on the ow manifold body and coupled to a
microswitch that prevents the burner working when pressure
is below 0.3 bar.
It prevents the main exchanger from overheating.
ISPESL type approved 4 bar safety valve (3).
It prevents the safety pressure from being exceeded in the
circuit (4 bar).
It is located at the front of the ow manifold body to which
it is coupled.
When this valve trips it causes water to come through the
system ow pipe to which an extension pipe (4) is connected
that ends with a collection funnel (5).
5
2
3
4
1
System
ow
2
3
5
6
7
1
8
4
3
Flue
Condensate
discharge
System
return
System
ow
Technical Documentation
Technical Documentation