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0006080895 ed 2007/02
TWO-STAGE GAS BURNERS
DETAILS OF TERMINAL BOARD
FOR VALVE MB-ZRDLE
1st POSITION
2nd POSITION
VALVE
INLET MAX PRESSURE
ADJUSTTABLE OUTLET PRESSURE
TYPE OF GAS
MODEL
(PE) mbar
FROM THE STABILIZER (PA) mbar
MB ...B01 S 20
360
from 4 to 20
Gas maturale / L.P.G.
The monobloc
DUNGS
Model
MB-ZRDLE
is made up of:
a) Minimum gas pressure switch (3) and maximum gas pressure (12)
b) Gas fi lter (6)
c) Pressure regulator (stabilizer) (2)
d) Safety valve (incorporate in the pressure regulator) which opens and closes rapidly (4)
e) Principle valve with two positions (lst fl ame and 2nd fl ame) which opens slowly with an adjustable initial rapid
release and rapid closing (8).
Before proceeding with regulation, read the following:
1) It is possible to reach the gas fi lter (6) in order to clean it, by removing one of the two side closing plates.
2) The pressure stabilizer can be regulated (see table) by manoeuvring it’s regulating screw. it can be reached by
sliding the cover (2) to one side. The complete run from the minimum to the maximum position and viceversa is
about 60 turns. Do not force against the end-of-the-run position. Before starting up the burner, give the screw
at least 15 turns towards the + sign. Around the screw are arrows with symbols which indicate the sense of
rotation to increase the pressure (in a clockwise direction) and the sense of rotation to decrease pressure (in
an anti-clockwise direction). The stabilizer hermetically closes from “upstream” to “downstream” when there is
no gas fl ow. Different springs to obtain different pressure values from those descrive above are not foreseen.
To regulate the pressure stabilizer, connect a water manometer to the rubber tube holder installed on
the valve, to tap Pa (7), in correspondence with the stabilizer exit.
3) It is not necessary to regulate the rapid opening and closing safety valve (4).
4) Principle valve (8).
Regulating the initial rapid release
effects the 1
st
and 2
nd
opening positions of the valve. Regulation of the rapid
release andof the hydraulic brake modify the 1
st
and 2
nd
positions of the valve in proportion to the output regulated.
To carry out regulation, unscrew the protection cover (11) and use the back part of it as a tool to turn the pin.
Rotation in a clockwise direction = minor rapid release
Rotation in an anti-clockwise direction = greater rapid release
REGULATING THE FIRST POSITION (1
ST
FLAME)
Loosen the screw with the protruding cylindrical head (1) Give the knob (10), which regulates the output for the
2
nd
fl ame, at least one turn in the direction of the arrow which indicates the +sign (anti-clockwise direction).
Rotate the regulating ring (9) of the 1st fl ame in the direction indicated by the arrow towards the + sign
(anti-clockwise direction). As an indication, this should be a little more than two turns from the end-of-the-run position.
Then, when the lst fl ame only is alight, rotate adequately ring (9) in order to obtain the gas delivery desired.
The complete run of the output regulator, from the - position to the + position, and viceversa, is about three and
a half turns. Rotation of the regulator in a clockwise direction, determines a reduction in delivery; rotation in an
anticlockwise direction increases delivery.
REGULATING THE SECOND POSITION (2
ND
FLAME)
Loosen the screw with the protruding cylindrical head (1).
Rotate the knob (10) in the direction indicated by the arrow for the + sign
(anti-clockwise direction) as much as considered necessary in order
to obtain the gas delivery required for the 2
nd
fl ame. The complete run
of the regulator from the - position to the + position, and viceversa, is
about FIVE turns. Rotate in a clockwise direction to determine a re-
duction in delivery and in an anti-clockwise direction to increase it.
After regulatiny._the gas delivery for the 1
st
and 2
nd
fl ame, remember
to tighten home the screw (1) to avoid the regulator moving out of
the position at which it has been set.
N° 0002910311
REV.:13/01/2004
COMBINED DUNGS GAS VALVE (monobloc)
MOD. MB-ZRDLE...B01
