baltur BGN LX series Betriebsanleitung Seite 38

IGNITION AND GAS REGULATION (METHANE)
1) Make sure that the combustion head penetrates into the combustion chamber by the quantity required by
the manufacturer. Check that the device that turning off the air on the combustion head is in the proper position
for the required fuel supply (the air passage between disk and head must be sensibly reduced in case of low fuel
supply. In the contrary case, if the fuel supply is quite high, the air passage between disk and head must be
opened). See chapter "Combustion head regulation".
2) If not already done when connecting the burner to the gas pipes, taking the necessary measures and opening
doors and windows, it is necessary to bleed the air contained in the pipes. Open the union on the pipes close to the
burner, and slightly open the gas stop cock(s). Wait until you smell the typical gas smell, and then close the cock.
Wait for the necessary time, according to the specific conditions, until the gas present in the room is dispersed
outside and then restore the connection of the burner to the gas piping.
3) Check that there is water in the boiler and that the plant dampers are open.
4) Make sure that the combustion product discharge can occur freely (boiler and chimney dampers open).
5) Check that the electrical line voltage corresponds to that required for the burner, and that the electrical connec-
tions (motor and main line) are preset for the available voltage value. Check that all electrical connections im-
plemented on the spot are properly executed as per our wiring diagram.
6) Apply a pressure gauge with suitable scale to the gas pressure take-off to measure the regulation value (if the
expected pressure rate allows it, it is preferable to use a water column instrument, do not use hand instruments for
low pressures).
7) Regulate the air for the ignition flame, for minimum flame and high flame, following the instructions for regulating
air damper control electrical motor shown in the following pages. In practice, set the low flame and high flame air
regulation cams to the suitable positions according to the desired thermal power for low and high flame.
8) By acting on the special screw for adjusting the gas and air pressure ratio, on the gas valve mod. MB-VEF..,
DMV-VEF.., set the desired value (see the specific instructions for the gas valve MB-VEF.., DMV-VEF.. in the
following pages).
9) With the burner panel switch set to "0" and main circuit breaker on, manually turn the contactor off and check that
the motor runs in the correct direction. If necessary, invert the place of two cables of the line supplying the three-
phase motor to reverse the direction of rotation.
10) Now enable the control panel switch and set the modulation switches to MIN (minimum) and MAN (manual). The
control box thus receives voltage, and the programmer determines the enable of the burner as described in chap-
ter "description of the operation".
Note: Pre-ventilation is carried out with open air and thus, during the same, the regulation servomotor is enabled,
and it runs a complete opening stroke up to the "maximum" set. Only when the regulation servomotor
returns to the "ignition" position, the control box continues its ignition program by enabling the transformer
and the ignition gas valves.
During the pre-ventilation step, make sure that the air pressure control switch changes position (from off position
without pressure detection it must switch to the off position with air pressure detection). If the air pressure switch
does not detect the sufficient pressure (it does not switch position), the ignition transformer and the flame gas
valves are not enabled, and thus the control box "locks". Note that some "locks" at the first stage are normal since
in the valve ramp pipes there is still air that must be discharged before having a stable flame.
To "unlock", press the "unlock" push button. At the first stage there may occur further "locks" due to:
a) The gas pipes have not been sufficiently air-bled, and thus the gas quantity is not sufficient to allow a stable
flame.
b) The "lock" with presence of flame may be caused by instability of the same in the ionisation zone for an
incorrect air/gas ratio. Remedy is by varying the quantity of supplied air and/or gas so as to find the correct
ratio. The same problem may be caused by a wrong air/gas distribution in the combustion head. Remedy is by
operating on the combustion head regulation device, by adjusting the closing or opening of the air passage
between head and gas diffuser.
EN
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