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APPLICATION OF THE BURNER TO BOILER
GAS FEED SYSTEM AT LOW PRESSURE (max - 400 mm.W.C.)
In addition. the following should be installed: a cut-off cock, a
gas filter, a pressure stabilizer or a pressure regulator (when
the feed pressure is superior to 400 mm.W.C. = 0.04 kg/cm
2
),
and an antivibration Joint. These parts should be installed as
described in our drawing (see BT 8780).
We consider it useful to give the following practical tips for installing
the essential accessories on the gas pipeline near to the burner:
1) To avoid big drops in pressure on ignition the length of the pipeline
between the point where the stabilizer or reducer is fitted and
the burner should be from 1,5 to 2 m. This pipe must have a
diameter equal or superior to that of the burner attachment
fitting.
2) To get the best performance out of the pressure stabilizer, it is
advisable to fit it onto horizontal pipes after the filter. The gas
pressure regulator must be adjusted while it is working at the
maximum capacity actually displayed by the burner. The output
pressure must be adjusted to a value slightly lower than the
maximum possible value (that obtained by turning the adjusting
screws almost up to the limit). In this specific case, tightening
the adjusting screws will increase the pressure at the regulator
outlet, and slackening them will reduce the pressure.
3) 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 pipe
fitting itself has been opened.
FOR BURNERS WITH DUNGS GAS VALVE mod. MB.....
The DUNGS mod. MB.... valve has a filter and gas pressure stabi
-
lizer, which means that only the cut-off cock and the vibration damper
joint should be fitted to the gas feed pipe. A pressure reduction unit
should be installed outside the heating system only in cases where
the gas pressure exceeds the level permitted by the standard (400
mm.C.A.).
It is recommended to put a bend directly on the burner gas train
before fitting the detachable connector. This is to allow the opening
of the boiler door, when the connector itself has been opened.
These details are clearly illustrated in the following diagram.
8871GB.tif
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