20
APPLICATION OF THE BURNER TO BOILER
The burner is equipped with a mounting flange which
slips on the burner head. When applying the burner
to the boiler, it is necessary to correctly position
the flange so that the burner head enters the furnace
to the extent specified by the boiler manufacture.
When the burner has been correctly fastened to the
boiler, proceed with connecting in to the gas pipeline.
The dimensions of the gas adduction pipeline should
be in function with it’s length and with gas delivery
according to UNI regulations. It must be perfectly
hermetic and adequately tested before the burner is
general inspection. It is indispensable to install a
suitable pipe union in the pipeline, in proximity to the
burner, to allow for easy disassembly of the burner
and opening of the boiler door. The DUNGS mod.
MB... valve incorporates a filter and a gas pressure
stabilizer and, therefore, only a cut-off cock and an
anti-vibration joint have to be fitted 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
pressure reducer on the gas pipeline outside the
heating plant. We advise installing a bend directly
onto the burner gas ramp before applying the
removable fitting. This layout makes it possible to
open the boiler door, if there is one, after the fitting
itself has been opened. The above is clearly illustrated
in the following drawing
(see BT 8871/GB).
ELECTRICAL CONNECTIONS
The electric lines should be at an adequate distance from hot parts. It is advisable to make all connections with
flexible electric wire. Minimum section of conductors 1.5 mm
2
. (CEI 64/8 3.I.07).
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
(8 second), 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 flame 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 flame 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 red button on the control panel.
ENGLISH
Boiler
Anti vibration
joint
Pipe fitting
Vanne gas DUNGS
multibloc
Burner
Door opening
direction
Door
Gate
UPPER VIEW
BT 8871GB
