Immergas VICTRIX 50 - Fan and Venturi Components

9
STV50 ed 09/08 VICTRIX 50 Rev. 002
1
2
3
9
P1
7
8
4
5
6
1
Fan.
is operates upstream from the combustion chamber and it is
physically positioned at the bottom of the sealed chamber.
It is controlled by the integrated board with a positive square
wave signal with a variable ON-OFF (duty-cycle) ratio.
Its speed is adjusted (from about 1250 to about 5200 rpm) ac-
cording to the output required and is controlled by means of
a Hall eect sensor which reads the rpm.
e fan extracts the combustion air from the top of the draught
diverter through a plastic pipe (1) that helps reduce noise and
optimises burner ignition.
Variations in the ow of air entering the mixing duct results
in a variation in the pressure (P1) signal at the inlet of the
Venturi pipe and enables the pneumatic valve to regulate
exiting gas pressure.
Venturi.
e Venturi pipe (1) is tted in a sealed duct (6) inside which
the combustion air and gas are mixed.
e air is driven to the bottom of the duct by the fan, while
the exiting gas from the valve is injected at the Venturi pipe
(1) inlet by a nozzle (2).
e transit of air in the pipe creates vacuum (“Venturi eect”)
which, through the 4 holes (3) in the base, “drags” the gas
inside and mixes it with the air.
e nozzle (2) diers in diameter according to whether natural
gas or LPG is used; in fact working with both gases at a more or
less constant pressure, its section determines correct gas ow.
At the end of the Venturi pipe is a pressure pick-up point where
the input signal (P1) is read.
is signal is conveyed to the pneumatic valve regulating the
gas pressure via a silicone pipe.
GAS
AIR
Technical Documentation
Technical Documentation