Electrical Connections; Light Oil Ignition And Adjustment; Natural Gas Ignition And Adjustment - baltur COMIST 36 Instrucciones

ELECTRICAL CONNECTIONS
Electric lines should be kept well
away from hot parts. All connections
should be carried out with flexible
electric wiring with cross-section
suitable for available voltage and
power drain.
N.B. The burner is provided of a
switch to change manually from 1st
to nd stage.
NOTES ON IGNITION OF
DUAL FUEL BURNER
It is advisable to ignite first with liquid
fuel because in this case fuel supply
depends on the nozzle used. Natu-
ral gas supply can instead be varied
by operating the flow regulator.
PREPARATIONS FOR
IGNITION WITH LIGHT OIL
Ensure that the nozzles fitted are
suitable for the output of the boiler.
Light oil supply values in kg/h are
shown in the table
These depend on nozzle size and
pump pressure (usually 1 bar
for the first and second flames).
Bear in mind that 1 kg of light oil is
equal to about 10.00 kcal. When
selecting nozzles (spray angle 60°)
remember that fuel supply with the
first valve should not be much lower
than minimum burner flow rate (see
burner plate).
Make sure that the blast tube pene-
trates the combustion chamber as
per boiler manufacturer's instruc-
tions.
Check that the tank return pipe is
not blocked, that gates are closed,
etc. Any obstacle would in fact break
the seal on the pump or hose shaft.
Open the stop cock on the suction
pipe. Eliminate the connection or
"bridge" of the second flame thermo-
stat. Open the pump air bleed valve.
Switch on the main switch (burner
switch must remain set to "0" - off)
and manually close (see figure) the
pump motor remote switch to verify
that rotation direction is correct.
If necessary, change over two wires
of the main line at remote switch
output in order to reverse motor
rotation direction.
Manually switch on the pump motor
switch again to operate the pump
and suck light oil from the tank.
When light oil can be seen coming
out from the air bleed device, stop
the motor and close the air bleed.
The burner is now ready for light oil
ignition.
LIGHT OIL IGNITION AND
ADJUSTMENT
1) Ensure that motors (fan and
pump) rotate in correct direc-
tion.
) Make sure discharge of combu-
stion waste occurs without any
hindrance (chimney gate open)
and that there is water in the
boiler.
3) Open the combustion air regu-
lator to the extent you consider
necessary (see BT 8653/1).
Then open by one third the air
passage between blast tube and
disk,using flame disk screw.
4) Switch on main and burner (light
oil setting) switches to cut-in and
await ignition. If the air pressure
control pressure switch reads a
value above preset pressure,
first switch on the ignition tran-
sformer and then the light oil
valves (relief and first flame).
While burner is operating on
first flame, adjust combustion
air supply, if necessary. After
adjusting, switch off burner and
then switch on again in order to
ensure that ignition is correct.
Remember that for smooth
ignition air should be adjusted
as little as possible. If ignition
is smooth, switch off burner
and make a bridge connection
between the terminals of the
second flame thermostat and
set the 1st and nd stage switch
in "nd stage" position.
5) Adjust combustion air to the
setting considered necessary
for cutting-in the second flame
(see BT 8653/1).
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6) Now switch on the burner once
again. It will operate on first
and second flame. Operate the
second flame air adjustment
cam to adapt supply to actual
conditions.
7) The burner is provided with a
device that improves combu-
stion by reducing or increasing
air passage between disk and
blast tube. Maximum permitted
smoke intensity is n°  on the
Bacharach scale, with carbon
dioxide (CO ) value within ran-

ge of 10 to 13%. To improve
combustion and for good flame
stability (no pulsations) it may
be necessary to operate the
blast tube adjustment device.
If burner operates on low fuel
supply, the air passage between
disk and blast tube should be
reduced (unscrew the blast tube
position adjustment screw in the
case of COMIST 36 and move
forward the blast tube fixing
knobs in the case of COMIST
7 and COMIST 1).
When the burner is operating at
a higher fuel supply level, this
passage should be opened pro-
portionately (screw the blast tube
position adjustment screw in the
case of COMIST 36 and move
backward the blast tube fixing
knobs in the case of COMIST
36 and move backward the blast
tube fixing knobs in the case of
COMIST 7 and COMIST 1).
If flame disk position is modified,
it is usually also necessary first
to correct the positions of the
first and second flame air regu-
lation gates. Then, check that
ignition is correct.
NATURAL GAS IGNITION
AND ADJUSTMENT
N.B. See end pages for detailed
description of gas supply adjust-
ment depending on type of valve
fitted to burner.
Before igniting, it is essential to di-
scharge air in the pipes and check,
if burner is three-phase, that motor
rotation direction is correct. Next,