Use Of The Burner; Adjusting Air On The Combustion Head (Methane Gas) - baltur GI MIST 1000 DSPGM Manual De Instrucciones

14) The modulating servo-motor will now start up. wait until the
modulator disk has moved through an angle of about 12° (cor-
responding to the space occupied by three screws) and then
interrupt modulation by turning the switch back to "O". Make a
visual check on the flame and if necessary regulate gas and air
throughput rates using the regulator screws on the modulator
disk. This procedure must be repeated throughout the whole
modulation travel of the disk, making adjustments in air and gas
throughput at 12° intervals. It is important to check that the gas
and air flows rates rise gradually and that maximum rates are
obtained at the end of the modulation range. This conditions is
essential to ensure that the modulation provides smooth and
gradual increase or decrease in burner output. If necessary,
change the position of the screws controlling fuel throughput
to obtain this result.
15) At this point, with the burner providing the maximum
heat output required by the boiler, check combustion
E
using the appropriate instruments and, if necessary, modify the
previous setting made solely on the basis of visual inspection.
N
(CO max. = 10% which corresponds to an O
2
G
3% - CO max. = 0,1%).
16) It is very important to carry out an instrument assisted check
L
on combustion and modify, where necessary, the initial visual
setting, this must also be effected in a series of intermediate
I
positions of the modulation range.
S
17) Now check that the modulation system is operating correctly
by turning the AUT - O - MAN switch to "AUT" and the MIN - O
H
- MAX switch to "O". With this setting the modulation function
will cut in automatically only in response to requests from the
boiler detector. Under normal conditions there will be no need
to alter the internal adjustment of the RWF 40 controller; in
case this should become necessary, however, instructions have
been included under a separate heading in this manual.
18) Check that the flame supervision device (UV photocell) is
operating correctly by sliding it out of its seat on the burner and
checking that the burner effectively locks out.
19) Check that the boiler thermostats or pressurestats are operating
correctly they must cause the boiler to shut down when they
cut in.

USE OF THE BURNER

The burner operates fully automatically: it is activated by closing
the main switch and the control board switch. Burner operations are
controlled by commend and control devices, as described in the
chapter "Description of Operations". The "shut down" position is a
safety position automatically taken up by the burner when a particular
part of the burner or of the system is inefficient. Therefore, it is good
practice, before unblocking the burner and starting it up again, to
check that there are no defects in the heating plant. The length
of time that the burner rests in the "shut down" position is without
limit. To unblock the control box, press the appropriate pushbutton.
"Shut down" can be caused by transitory flows (a little water in the
fuel, air in the pipes, etc.); in these cases, if unblocked, the burner
will start up normally. When, however, shutdowns occur repeatedly
(3 or 4 times), do not persist in trying to unblock the burner, first
check that there is fuel in the tank and then call the local service to
repair the defect.
SERVICING
The burners do not require particular servicing, it is good practice,
however, that authorized personell performs the following operations,
at least at the end of the heating season:
1) Clean to photocell
2) For gas burners, periodically check that the gas filter is clean.
3) Clean the combustion head by dismantling the blast pipe into its
component parts. Take care during reassembly that the ignition
electrode is correctly positioned, checking that the spark jumps
only between the electrode and the central drilled pilot flame disk.
ADJUSTING AIR ON THE COMBUSTION HEAD
The combustion head is equipped with a device that automatically
regulates the passage between the diffusor disk and the head, ad-
mitting combustion air to the head. This passage can be restricted
value of about
2
to obtain high pressure upstream of the diffusor disk, even with low
fuel throughput, so that high velocity and turbulence ensure that the
air penetrates the gas more thoroughly, giving an optimum fuel/air
mixture and a stable flame. With gas burners, it can be essential to
have high air pressure on the diffusor inlet side if pulsation of the
flame is to be prevented, especially where the burner operates in
a high pressure combustion chamber, or in high thermal load con-
ditions. Accordingly, the head must be adjusted in such a way that
a substantially high pressure is always generated upstream of the
diffusor. It is recommended that the passage of air allowed through to
the head be restricted in such a way that there is a generous opening
of the air shutter regulating the air flow supplied by the burner fan.
To achieve this, adjust the screws on the modulation disk. When
the regulation is complete, remember to tighten the screws locking
the regulator screws.
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