baltur COMIST 180 DSPNM Mode D'emploi page 24

burner has been started up only with gas, it is also necessary
E
to check that the combustion air regulation shutter is in the right
position. If necessary, modify it by adjusting the screws or the
N
regulating disk.
G
8) Remove the protective cover from the disk on which are in-
serted the screws which regulate the gas and air delivery, and
L
unloosen the locking screws.
I
9) With the switch on the burner's control panel in the "O" position
and the main switch inserted check by manually closing the
S
relay, that the motor rotates in the right direction. If it does not,
exchange the places of two cables of the motor's supply line
H
in order to invert its sense of rotation.
10) Now insert the switch on the commend panel and put the mo-
dulating switches in the MIN (minimum) and MAN (manual)
positions. The control box receives voltage in this way and the
programmer turns on the burner as described in Chapter "De-
scription of Operations". During the pre-ventilation phase check
that the air pressure switch effects a changeover (it should pass
from a closed position without measurement of pressure to a
closed position with measurement of air pressure). If the air
pressure switch does not measure sufficient pressure (it will not
effect the changeover) and neither the ignition transformer nor
the gas ignition flame valves will be inserted and the control box
will go to "shut down". It should be pointed out that "shut downs"
during the first ignition phase are considered normal. This is
because air still exists in the pipeline of the valve incline and
must be expelled before it is possible to have a stable flame.
To unblock the control box, press the relative push-button.
UV CELL
If the flame detection is carried out with the UV cell, the fol-
lowing should be taken into consideration. Even the slightest
greasiness will compromise the passage of the ultraviolet rays
through the UV photoelectric cell bulb, thus preventing the sen-
sitive internal element from receiving the quantity of radiation
necessary for it to function properly. Should the bulb be fouled
by light oil, fuel oil, etc., it is indispensable to clean it thoroughly.
It should be pointed out that even by simply touching the bulb
with the fingers, it is possible to leave a slight greasiness which
could compromise the working of the UV photoelectric cell. The
UV cell does not "see" daylight or light from an ordinary lamp.
It is possible to verify its sensibility with a flame (or cigarette
lighter or a candle) or with the electric spark that occurs betwe-
en electrodes in an ordinary ignition transformer. To ensure
that the UV cell works properly, its current value should be
sufficiently stable so as not to fall below the minimum value
required for the specific control box. It may be necessary to
search experimentally for the best position by sliding (axial or
rotation movement) the body that contains the photoelectric cell
in respect to the fastening clamp. An inspection can be carried
out by inserting a microammeter, with an adequate scale, in
series to one of the two UV photoelectric cell connection wires.
It is obviously necessary to respect the polarity + and -). The
value of the cell current to ensure functioning of the control box
is shown on the wiring diagram.
11) With the burner operating at a minimum (ignition flame and
safety valves open, modulation regulator at a minimum),
All manuals and user guides at all-guides.com
12) After having regulated at "minimum", put the modulation switches
13) The servomotor regulating delivery (gas/air) starts up. Wait
14) With the burner operating at maximum delivery required for the
15) We recommend controlling the combustion with the appropriate
16) Check that modulation functions automatically by putting the
20 / 30
0006080118_200811
immediately check visually the entity and appearance of
the flame and, if necessary, proceed with correcting it by
operating the gas delivery regulator of the ignition flame
(pilot). Subsequently, check the quantity of gas delivered
by reading the meter. See Chapter "Reading the Meter".
If necessary, correct the gas delivery by operating the flow
regulator incorporated in the ignition valve (pilot). Then
control combustion with the appropriate instruments. For a
correct air/gas ratio, the percentage of Carbon Dioxide (CO
should increase together with the increase in delivery. As an
indication, for methane gas, the percentage should be from at
least 8% at minimum burner delivery to an optimum value of
10% for maximum delivery. We advise against exceeding the
value of 10% to avoid operating with a rather limited excess
of air which could cause (variation in atmospheric pressure,
presence of dust particles in fan's air ducts) a considerable
amount of Carbon Monoxide (CO). It is indispensable to check,
with the appropriate instruments, that the Carbon Monoxide
(CO) present in the smoke does not exceed the maximum level
permitted of 0,1%.
in the "MAN" (manual) and "MAX" (maximum) positions.
until the disk on which the regulation screws have been fitted,
has reached an angle of about 12° (this corresponds to the
space taken up by three screws), and then stop modulation
and return the switch to the "O" position.
N.B. The "V" cam of the servomotor which regulates
delivery (fuel/air), see BT 8562/1, inserts almost
immediately the principle gas valve(s) which open
completely. Gas delivery is not determined by the
principle valve but by the position of the gas delivery
regulation valve (see BT 8813/1). Carry out a visual
control of the flame and proceed if necessary, with
regulating the gas and air delivery by operating
the adjustable screws of the regulation disk. The
operation described above should be repeated pro-
gressively (by moving forward the disk about 12° at
a time) and modifying every time, if necessary, the
gas/air delivery during the whole modulation run.This
is necessary in order to ensure that the modulation
functions with good graduality. The positions of
the screws that commend the fuel may need to be
modified in order to obtain the graduality required.
boiler, check combustion with the appropriate instruments and
modify, if necessary, the previous regulation carried out after a
visual control only (CO max. = 10% - CO max. = 0,1%).
2
instruments and, if necessary, modify the previous regulation
carried out, after a visual control only, also in a few intermediate
points of the modulation run.
AUT - O - MAN switch in the "AUT" position and the MIN - O
- MAX switch in the "O" position. In this way, modulation is
activated exclusively by the automatic command of the boiler's
)
2