Riello RDBS0.1 Instrucción página 9

GAS TRAIN PRESSURE LOSS
The gas train pressure loss ∆p is provided from the
diagram; the scales of the volumetric output
valid respectively for:
a = air,
n = natural gas (G20),
p = propane (G30),
c = city gas (G140), only for applications not covered
by the Gas Appliances Directive (90/396/EEC).
The value indicated in the diagram will differ accord-
ing to the adjustment of the pressure stabilizer.
The minimum necessary pressure in the network
can be obtained by adding the pressure of the dia-
gram to the burner pressure losses and the back
pressure of the combustion chamber (see the tech-
nical instruction of the heat generator).
FILTER MAINTENANCE
If necessary the filter can be replaced; for this oper-
ation you must call the service agent.
PRESSURE STABILIZER ADJUSTMENT
By rotating the pressure regulator adjustment screw
clockwise, the gas head pressure and thus output
increases. Anti-clockwise reduces the pressure and
output.
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VALVE ADJUSTMENTS
The slow opening of the valve providing reduced
ignition gas is adjusted by turning the screw (10,
fig. 4 page 1) anti-clockwise to increase the start
gas quantity and clockwise to decrease it.
It is possible to set the valve to give an ignition gas
rate of 80% of the maximum, however to ensure
smooth ignition, we would recommend that this
value is kept to a minimum value but that allows
reliable operation. The introduction of the main gas
output is achieved through the valve continuing to
open slowly once ignition has been achieved.
The main gas throughput is set by adjusting the
screw (12, fig. 4 page 1) anti-clockwise to increase
rate and clockwise to decrease.
LOW GAS PRESSURE SWITCH ADJUSTMENT
Adjust the gas pressure switch (6, fig. 4 page 1)
after carrying out all the other adjustments of the
burner with the gas pressure switch adjusted at the
beginning of the scale. Let the burner work at the
required output. Slowly start to close the gas isola-
tion valve on the gas supply manifold reducing the
pressure by 5 - 6 mbar from that recorded as the
normal working gas pressure measured on your
pressure gauge. Rotate the dial on the pressure
switch until the dial reads just below the reduced
value now showing on your pressure gauge, the
burner should shut down. Open op the isolation valve
and check that the burner starts and runs correctly.
INITIAL ADJUSTMENT OF THE GAS VALVE
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ADJUSTMENT OF THE START GAS FLOW
°
(10, fig. 4 page 1)
are
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Rotate the screw (10) clockwise until a resistance
is felt. Rotate the screw anticlockwise for 7 turns.
This is an initial setting and may require adjusting
for different outputs.
ADJUSTMENT OF THE MAIN FLOW RESTRICTOR
(12, fig. 4 page 1)
Rotate the screw (12) clockwise until a resistance is
felt. Rotate the screw anticlockwise for three turns.
This is an initial setting for the burner to fire and will
require adjusting for different outputs.
PRESSURE GOVERNOR (11, fig. 4 page 1)
Rotate the screw (11) anticlockwise until you hear the
click at the end of a full rotaton at this point.
Rotate the screw clockwise by 12 turns this will set
the governor at a mid position from where adjust-
ments to the through put can be made.
GAS PRESSURE (M3, fig. 4 page 1)
The gas head pressure is measured at the pres-
sure test point (M3).
AIR DAMPER ADJUSTMENT
See burner's instruction (3, fig. 8, page 9).
2 GB