The DUNGS MB-DLE... gas valve unit is made up of:
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A safety valve which closes opens rapidly (6).
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A main valve which opens in two stages (5). The first opening stage
occurs rapidly (release) and can be adjusted unscrewing the knob
(2) and inserting it overturned on the underlying adjusting pin. The
+ and - symbols on the valve head indicate the direction in which
the knob should be turned to change gas ignition flow rate (first
valve opening stage). Rotating in a clockwise direction, the ignition
delivery diminishes; rotating in an anti-clockwise direction, the
delivery increases. The complete stroke from zero to the maximum
is slightly more than three turns (40% of the total opening), and
vice versa. When the first opening stage has taken place, the
valve continues to open slowly and takes 15 seconds to reach the
maximum open position. To adjust the desired maximum delivery,
loosen the screw with locking protruding head (4) and turn the
knob (3). Do not tamper with the painted screw. Turn in a clockwise
direction to reduce delivery and in anti-clockwise direction to
increase it. It should be pointed out that when the regulating
knob is turned, the end-of-the-run which limits the operating of
the valve moves; therefore, when the knob has been turned until
it reaches the - sign, the valve will not open and the burner will
not ignite. To get ignition, it is necessary to turn the knob in an
anti-clockwise direction towards the + sign. The complete run from
zero to maximum and vice versa is nearly six turns of the knob.
This adjusting operation (for maximum and ignition output) must be
carried out without forcing the corresponding end of stroke.
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The pressure stabiliser (10) can be adjusted (see table) using the
screw which can be accessed sliding the cover (1) to one side. The
complete run from the maximum to the position and vice versa is
about 80 turns. Do not force against the end-of-the-run positions.
Around the access opening there are arrows with symbols
indicating the rotation direction for pressure increase (clockwise)
or decrease (anti-clockwise). This stabilizer creates a hermetic
closure between the "upstream" and "downstream" sections when
there is no flow. Different springs to obtain different pressure value
from those described above are not foreseen. To regulate the
pressure stabilizer, connect a water manometer to the rubber tube
holder installed on the tap (8) in correspondence with the exit of the
stabilizer (Pa).
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The inlet filter (12) can be accessed for cleaning removing one of
the two side closing plates.
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Minimum pressure switch (14). For adjusting remove the
transparent cover and operate the black knob. The reference mark
is a small rectangle on the yellow disk around which the adjusting
knob rotates.
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At the inlet, a fitting (13) has been installed on the connection flange
to measure the inlet pressure. At the connection flange outlet, there
is also a fitting (7) to measure the outlet pressure.
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The side pressure fittings (9), indicated as Pe, are in communication
with the inlet pressure.
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The side pressure taps (8) indicated as Pa, are used to measure
the pressure coming out of the stabilizer. It is useful to know,
that the pressure coming out of the valve unit (7) corresponds to
the pressure regulated by the stabilizer and is reduced in order
to overcome the crossing resistance of the principle valve (5).
The valve crossing resistances depend on the opening of the
valve regulated by the knob (3) through which the end-of-stroke
position is adjusted.
To regulate the pressure stabilizer,
connect a water manometer to the rubber tube
holder installed on tap (8) in correspondence to the
stabilizer exit (Pa).
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The holes of the pressure stabilizer bleed (11)
should be free and to ensure a proper operation.
SUGGESTIONS FOR ADJUSTING THE GAS
VALVE
•
Connect a water manometer to the pressure tap
Pa (8) to measure the pressure coming out of the
stabilizer.
•
Put the gas delivery regulators for ignition (2) and
for maximum delivery (3) in the positions presumed
necessary for the delivery desired. Also open the
combustion air regulator.
•
Turn on the burner.
•
With the burner on, operate under the cover (1)
on the adjusting screw of the gas and pressure
stabiliser and adjust pressure to the value
considered necessary to obtain the desired output,
approx. 40-70 mm. W.C. when the maximum output
regulator (3) is in the maximum opening position.
•
Put the ignition flow regulator (2) in the position
considered necessary to obtain ignition with the
minimum possible delivery.
CAUTION / WARNINGS
With irregular ignitions, adjust the pressure to
the stabiliser (8) at 20 mbar.
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0006080749_202206
ENGLISH
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