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CAM II
SECOND STAGE
Cam V adjusts the position of the 2° stage damper.
(Reference value 60°, do not exceed 70°).
Do not tamper with this adjustment for any reason.
WARNING
The adjustment of the 2° stage air is carried out using the damper
cover 1)(Fig. 14).
Cam III
Cam III controls the opening of the 2° stage gas valve, and it
should always anticipate cam II by at least 15°.
To adjust the burner output of the 1° and 2° stage,
respect the following recommendations:
–
the burner output ratio between the 1° and 2°
stage should be maximum 1 : 2; if this ratio is
WARNING
exceeded the valve seal control will have to be
used.
–
In any event, the minimum burner output in
the 1° stage should not be less than the value
indicated in the firing rate.
5.10
Gas feeding
Explosion danger due to fuel leaks in the pres-
ence of a flammable source.
Precautions: avoid knocking, attrition, sparks and
heat.
Make sure the fuel interception tap is closed be-
fore performing any operation on the burner.
5.10.1 Gas feeding line
1
D4262
Key (Fig. 16)
1
Gas input pipe
2
Manual gate (the responsibility of the installer)
3
Gas pressure gauge (the responsibility of the installer)
4
Filter
5
Gas pressure switch
6
Safety valve
7
Pressure stabiliser
8
1st and 2nd stage adjustment valve
M1 Gas-supply pressure test point on the pressure switch
M2 Pressure coupling test point
Installation
2
3
M1
4
5
Micrometric screws
D1777
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
WARNING
6
7
8
17
GB
M2
Fig. 15
Fig. 16
20063795
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