38
EN
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 in-
stalling 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 work-
ing 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.
APPLICATION OF THE BURNER TO BOILER
FOR BURNERS WITH DUNGS GAS VALVE mod. MB.....
The DUNGS mod. MB.... valve has a filter and gas pressure
stabilizer, which means that only the cut-off cock and the vibra-
tion damper joint should be fitted to the gas feed pipe. A pres-
sure reduction unit should be installed outside the heating sys-
tem 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.
GENERAL DIAGRAM FOR INSTALLATION OF GATE-
FILTER-STABILIZER-ANTI-VIBRATION JOINT-
OPENABLE PITTING
8780GB.tif
8871GB.tif
