Starting Up And Regulation With Methane - baltur COMIST 72 DSPGM Manuel D'installation, Utilisation Et Entretien

opacity below N° 2 of the Bacharach Scale, even if, as a con-
E
sequence, the CO
2
opacity dirties the boiler less and therefore its average yield
N
is normally high even when the CO
It should be remembered that, in order to regulate properly,
G
the water in the system should be at the right temperature
and the burner should have been operating for at least 15
L
minutes. If the appropriate instruments are not available,
I judgement can be based on the colour of the flame.
We advise regulating in such a way as to obtain a flame bright
S
orange in colour. Avoid a red flame with smoke in it, or a white
flame with an exaggerated excess of air. After having checked
H
the air/fuel regulation, tighten the locking screws of the adju-
stable screws.
19) Control that the modulation motor functions automatically by
putting the AUT - O - MAN switch in the "AUT" position and the
MIN - O - MAX switch in the "O" position. In this way, modula-
tion is activated exclusively by the automatic command of the
boiler's probe, if the burner is a COMIST...MM (modulating)
version, or on the command of the thermostat or pressure
switch of the 2nd stage, if the burner is a COMIST...DSPGN
(two stage progressive) version. (See Chapter "Electronic
Potentiality Regulator RWF... for the modulating version).
Normally, it is not necessary to alter the internal settings of the
Potentiality Regulator RWF... .
20) Check the efficiency of the flame detection device (photocell
UV). The photoresistant cell is a flame control device and, if
the flame should be extinguished during operations, it must be
capable of intervening (this control should be made at least one
minute after start up). The burner should be capable of blocking
itself (shut down), and remaining so, if the flame does not appear
regularly during the start up phase within the time limit preset
on the control box. The shut down causes an immediate inter-
ception of the fuel, the burner comes to a standstill and the red
warning light comes on. To check the efficiency of the photocell
UV and of the shut down system, proceed as follows:
a) Start up the burner
b) after one minute, extract the photoresistant cell by pulling
it out of its seat and simulate flame failure with a dark
cloth. The flame should be extinguished and the control
box will repeat the ignition phase from the beginning
and, immediately after the flame appears, it will go to
shut down.
c) The control box can only be unblocked by pressing
manually on the appropriate pushbutton (unblocking).
To check the efficiency of the shut down device, carry
out this control at least twice.
21) Check the efficiency of the boiler's thermostats or pressure
switches (this operation should stop the burner).

STARTING UP AND REGULATION WITH METHANE

GAS
1) If not already done at the moment of connecting the burner
to the gas pipeline, it is indispensable to carry out a purge of
the air contained in the pipeline. As a precaution, special care
value is slightly lower. The lower smoke
value is slightly inferior.
2
should be taken and doors and windows should be opened.
Open the pipe union on the pipeline situated near the burner
and the open a little the gas cut-off cock (or cocks). When the
characteristic odour of gas can be smelled, close the cut-off
cock. Wait until the gas present in the room has dispersed, and
then reconnect the burner to the gas pipeline. Subsequently,
re-open the gas cut-off cock.
2) Check that there is water in the boiler and that the system's
gas valves are open.
3) Check, with absolute certainty that the discharge of combustion
products can take place freely (boiler and chimney lock-gates
should be open).
4) Make sure that the voltage of the electric line to which the
burner is to be connected, corresponds to that required by the
burner and that the electrical connections (motor or principle
line) have been prepared to match the voltage rating available.
Also check that all the electrical connections carried out on the
spot are in accordance with our electric wiring diagram.
5) Make sure that the combustion head is long enough to enter
the furnace to the extent specified by the boiler manufacturer.
Check that the device which regulates the air on the combustion
head is in the position considered necessary for the fuel delivery
required (air passage between the disk and the head should be
considerably reduced when the fuel delivery is reduced; on the
other hand, when the fuel delivery is fairly high; the air passage
between the disk and the head should be relatively open). See
chapter "Air Regulation on the Combustion Head".
6) Apply a manometer with an adequate scale (if the entity of
pressure forecast allows it; it is preferable to use a column of
water instruments, do not use a pointer instrument for moderate
pressure) to the pressure plug on the gas pressure switch.
7) Open, to the quantity considered necessary, the flow regulator
incorporated in the ignition flame valve(s) (pilot). If the burner
is already working on light oil fuel, the combustion air regulation
shutter must not be modified; in such a case it will be necessary
to adjust the gas flow to the amount of air already adjusted for
the light oil operation. If the burner is started up only on gas it
is necessary to verify that the combustion air regulation shutter
is in the right position and, if not, to modify it by operating the
adjustable screws of the regulating disk.
8) Remove the protective cover from the disk on which are inserted
the screws which regulate the gas and air delivery, and unloosen
the locking screws.
9) With the switch on the burner's control panel in the "O" position
and the main switch inserted check by manually closing the
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
in order to invert its sense of rotation.
10) Now insert the switch on the commend panel and put the
modulating 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
"Description of Operations".
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