Starting Up And Regulation With Methane Gas - baltur GI MIST 1000 DSPGM Manual De Instrucciones

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
should be taken and doors and windows should be opened.
Open the pipe union on the pipeline situated near the burner
and then 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
gate 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.
6) Remove the protection cover from the disk carrying the air and
gas flow regulator screws and slacken the screws that block
the regulator screws.
7) Check that the air regulator device on the combustion head is in
correct position for the fuel throughput required (the air passage
between the diffusor disk and the head must be small for low
throughput and relatively wide when throughput is higher). See
"Combustion head airflow regulation" heading.
8) Fit a pressure gauge with suitable full scale (where the pressure
level envisaged allows, a liquid manometer is preferable; do
not use pointer gauges for low pressures) to the pressure outlet
port on the gas pressurestat.
9) Open, as far as considered necessary, the flow regulator
incorporated in the pilot flame valve(s). Also check that the
combustion airflow control shutter is sufficiently open; if neces-
sary, alter the position by acting on the regulator screws on the
regulator disk.
10) With the burner panel switch on "O" and the master switch in
'make', that the fan motor rotates in the correct direction. If
necessary, reverse two phases of the motor power supply line
to change the direction.
11) Now switch the panel switch to "I" and turn the modulation
switches to MIN (minimum) and MAN (manual).
With the control system receiving electrical power, the program-
mer will cause the burner to start up as described under the
foregoing heading "Description of natural gas operation". During
pre-purge time, check for operation of the air pressurestat, the
contacts of which should change from a pressure-zero 'make'
to a pressure-positive 'make'. In the event that the pressure
is sufficient and the pressurestat fails to respond, neither the
ignition transformer nor the pilot flame gas valves will operate
so the burner will shut down in lockout. Note that lockouts during
this first ignition sequence should be considered normal since
the fuel supply line will still contain air which must be purged
before a stable flame can be obtained. Press the "reset" button
to re-start.
UV Cell
If flame detection is carried out with the UV cell, the following
should be taken into consideration. Even the slightest gre-
asiness will compromise the passage of the ultraviolet rays
through the UV photoelectric cell bulb, thus preventing the
sensitive 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 or-
dinary lamp. It is possible to verify its sensibility with a flame
(or cigarette lighter or a candle) or with the electric spark that
occurs between 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 (+ e -). The minimum
cell current value, to ensure the correct operation of the control
box, is shiwn on the wirung diagram.
12) As soon as the burner is ignited at low flame (main flame valve
open and modulator on minimum) make a visual inspection of the
strength and appearance of the flame, making any corrections
required (adjust the gas or air regulator screws on the modulating
disk). The next step is to take a meter reading of the volume of
gas put through the burner (see the "Meter Reading" section).
If necessary, a further correction in the gas flow may be made
as described above. Once fuel and air flow are satisfactorily
regulated, a check must be made on combustion characteristics,
using the appropriate instruments. If the air/gas ratio is correct the
level of carbon dioxide (CO
be approximately - in the case of natural gas - 8% at minimum
burner output, rising to an optimum 10% at maximum output.
We recommend that the value of 10% should not be exceeded,
as operation in too limited an excess of air can give rise to
unacceptable carbon monoxide (CO) levels (due to variations
in atmospheric pressure, or dust deposits in the air lines). It is
essential to verify, using the appropriate instrument, that the
percentage of CO in flue gases does not exceed the maximum
permissible level of 0,1%.
13) After having regulated gas throughput for the minimum flame
setting, set the modulation switches to "MAN" (manual) and
"MAX" (maximum).
17 / 32
0006080764_201006
) per unit of fuel put through should
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