Adjusting Burner; Chimney Draft; Combustion Air; Flame Monitoring - ACV BMV3 Instrucciones De Instalación, Uso Y Mantenimiento

Figure 16
Figure 17
Figure 18
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MA 2
BMV3 / BMV4 / BMV5 : 662Y1000 • A
3.1. Adjusting the burner
In order to achieve low-emission combustion values, the
burner must be adjusted by measuring the exhaust gas using
suitable measuring instruments.
The measuring hole (Ø 8 mm) is to be located at a distance
of twice the diameter of the exhaust pipe behind the heater
and is to be closed after the measurement.
Caution: The heater and exhaust gas ducts must be
sealed tight.
3.2.

Chimney draft

In order to achieve constant combustion chamber pressure,
a draft damper must be installed in the exhaust gas line. The
draft damper must be installed to ensure that the vacuum in
the combustion chamber is not more than 0.1 mbar during
operation.
For overpressure boilers, refer to the boiler operating instruc-
tions to adjust the chimney draft.
3.3.

Combustion air

Each burner has been factory-adjusted with a basic air flow
rate, according to the installed nozzle. Depending on the
combustion chamber and the nozzle tolerance, the basic fac-
tory setting leads to an excess of air and must be re-adjusted
in all cases. The required quantity of air is determined from
the soot contents and the CO 2 measurement. The final ad-
justment should be performed using the throttle screw.
a. Air flap (see. fig.16)
Turning counter clockwise the air flap set-screw reduces the
air flow from the fan. Therefore, the fan pressure measured
at the measuring fitting decreases, and the CO 2 content in
the exhaust gases increases. Turning the set screw clock-
wise will open the flap and increase the fan pressure, thus
reducing the CO 2 content in the exhaust gases.
b. Baffle plate (see. fig.16)
• By turning clockwise the baffle plate set-screw, the
gap between the burner pipe and baffle plate is re-
duced, thus reducing the combustion air volume
while increasing fan pressure and the CO 2 content of
the exhaust gases.
• For reverse direction of rotation, the gap width and
thus the combustion air volume increases with de-
creasing fan pressure thus decreasing the CO 2 con-
tent in the exhaust gas.
Pay attention that the fan pressure is kept between 2,0 -
3,5 mbar.
We recommend setting a CO 2 content of 12 - 13 vol. %.
Fan pressure measurement is to be carried out at the
pressure measurement fitting (1) (see fig. 17).
The soot number may not exceed 0.5 according to the
soot number comparison scale.
3.4.

Flame monitoring

The photo-current is to be measured in series with the pho-
tocell (+pole on terminal 12, max. 5 kOhm inner resistance in
the instrument) (see fig. 18).
The photo-current must be between 55 μA and 100 μA at
230 V~ while in operation.
Measuring adapter MA 2 (see fig. 18) available on request.
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