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0006080895 ed 2007/02
TWO-STAGE GAS BURNERS
The burner is equipped with a moun ting fl ange which
slips on the burner head. When applying the burner
to the boiler, it is necessary to
correctly po sition
the
fl ange so that the burner head enters the furnace
to the
extent spe cifi ed by the boiler manufacture.
When
the burner has been correctly fa stened to the boiler,
proceed with con necting in to the gas pipeline.
The DUNGS mod. MB... valve in cor porates a fi lter and
a gas pressure stabilizer and, therefore, only a cut-off
cock and an anti-vibration joint have to be fi tted onto
the gas adduction pipeline. Only if the gas pressure
were above the maximum value allowed by regulations
(400 mm. W.C.) would it be necessary to install a pres-
sure reducer on the gas pipeline outside the heating
plant. We advise installing a bend directly onto the
burner gas ramp before applying the removable fi tting.
This layout makes it possible to open the boiler door,
if there is one, after the fi tting itself has been opened.
The above is clearly illustrated in the following drawing
(see BT 8871/GB).
BT
8871GB
DESCRIPTION OF OPERATIONS
By closing the main switch, and if the thermostats are closed, voltage will reach the control box and, after a short
time, the burner will start up according to its pre-established programme. The fan motor will then be turned on and,
when it starts functioning, it will bring about a pre -washing of the combustion chamber. Subsequently, ignition is
connected and, after three seconds, the safety valve and the operating (main) valve will open. The fl ame appears
in this way and, detected by it’s own control device, it permit the continuation and completion of the ignition phase.
In the case of fl ame failure, the control box activates a “safety shut down” within two seconds of the opening of the
gas valves (operating and safety). When there is a “safety shut down” the gas valves are immediately re-closed.
To unblock the control box from the safety position, push the button on the control panel.
INSTALLING ON BOILER
N° 0002934100
Rev. 10/02/2004
1) Lock the fl ange B on the tube of the
burner via the supplied screw A and nut
C (n° 2 x BTG ...).
2) Position the insulating seal E on the
tube, interposing the cord F between
fl ange and seal.
3) Finally, fix the burner to the boiler
via the 4 stud bolts and relative nuts
(supplied).
N.B. Make sure the tube penetrates
into the combustion chamber as per
the boiler manufacturer’s instructions.
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02
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The di mensions of the gas adduction pipeline should be in function with it’s length and with gas delivery according
to UNI re gu la tions; It must be per fe ctly hermetic and ade qua tely tested be fore the burner is general in spection. It
is indispensable to install a suitable pi pe union in the pipeline, in proximity to the burner, to allow for easy di sas-
sembly of the burner and opening of the boiler door.
