12
STV50 ed 09/08
VICTRIX 50 Rev. 002
Air-gas adjustments.
The calibration of the total premix combustion system, when
necessary, envisions the adjustment of the nominal heat output
and the air-gas ratio
(off-set).
With exception for the adjustment of the
nominal output that
is also carried out during the initial check
, the two operations
are only normally requested after a gas transformation, after
extraordinary maintenance
(replacement of a component of the
air-gas circuit, replacement of the integrated P.C.B. etc.)
or when
the appliance is not calibrated.
Adjustment of nominal and minimum heat
output.
The availability of maximum output is linked to the length of
the intake and exhaust pipes which, increasing, slightly reduces
the amount
(flow rate)
of inlet air and consequently also la
pressure of the burnt gas.
The boiler is calibrated as per standard for functioning with a
Ø80/125 horizontal concentric kit with length of 0.5m and
therefore the use of the flue kit with greater or lower head
losses requires a check and possible adjustment of the nominal
output according to the table give below.
The operation must be performed as follows and with respect
to the values stated in the heat output adjustment table:
- start the boiler in chimney sweep mode by pressing the
"MODE"
and "+" keys simultaneously for 2 seconds.
"H"
will appear on the display followed by a 2-figure number
indicating the temperature of the primary circuit, then check
the maximum speed
(with burner on)
;
- after at least 5 minutes check and, if necessary, modify the
value of parameter N° 22 "Max number of fan rpm in CH
mode", after having inserted the code reserved for the tech-
nician, until obtaining the value
(N° of fan rpm)
referring
to the nominal output
(see technical data)
;
- press the
"MODE"
and "-" keys simultaneously for two
seconds. In this way the boiler is forced to minimum and
"L"
appears on the display followed by a 2-figure number
indicating the temperature of the primary circuit;
- check and, if necessary, modify the value of parameter N°
26 "Min number of fan rpm in CH mode" until reaching
the value
(N° of fan rpm)
referring to the minimum output
(see technical data)
;
To exit the chimney sweep mode, press the "+" and "-" keys
at the same time for 2 seconds.
Regulation of the air-gas ratio (off-set).
The correct regulation of the air-gas ratio (1:1) takes place
in the factory and must be retouched
only when carbon
dioxide (CO
2
) values are detected in the fumes that are
not optimal.
With this scope, during
the initial check or following extra-
ordinary maintenance interventions, flue analysis must be
performed at maximum heat output and minimum heat
output
, which attests the goodness of the combustion in
reference to the values indicated in the table below:
G 31
G 30
G 20
CO
2
at nominal
output
CO
2
at minimum
output
9,25 % ± 0,2
11,70 % ± 0,2
10,10 % ± 0,2
9,32 % ± 0,2
12,30 % ± 0,2
10,60 % ± 0,2
To carry out the control correctly and,
if necessary
, regulate
the air-gas ratio, proceed as follows:
DUNGS GB-GD 057 gas valve.
Calibration of the maximum CO
2
.
- Switch the boiler on and take it to chimney sweep mode by
pressing the
"MODE"
and
"+"
keys simultaneously for two
seconds. In this way the boiler is forced to maximum and
"H"
appears on the display followed by a 2-figure number
indicating the temperature of the primary circuit;
- withdraw the combustion products by inserting the analyser
probe fully home;
- check whether the value of carbon dioxide (CO
2
) is within
the limits indicated in the table regarding the nominal heat
output
(see table above)
;
-
if the values are incorrect
, take them within the limits by
acting on the off-set adjusting screws (12) of the gas valve.
By turning in a clockwise direction the CO
2
value decreases,
by turning in an anti-clockwise direction, it increases.
G20
G30
G31
Single boiler
Max. N°. RPM 5180
Max. N°. RPM 4600
Max. N°. RPM 5200
Min. N°. RPM 1280
Min. N°. RPM 1150
Min. N°. RPM 1250
Exhaust collector kit with
flue adjusting devices
Max. N°. RPM 5180
Max. N°. RPM 4600
Max. N°. RPM 5200
Min. N°. RPM 1580
Min. N°. RPM 1450
Min. N°. RPM 1550
Technical Documentation
Technical Documentation