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DIAGRAM OF CONNECTING A BURNER TI THE GAS PIPE NETWORK AT AVERAGE
PRESSURE
N° BT 8531/1
REV.: 15/11/1990
1 - Measuring and reducing unit
2 - Interception
3 - Filter
4 - Reducer
5 - Meter
6 - Wire gauze flame trap
7 - Eventual automatic overflow valve (it should obviously
unload outside in a suitable place)
8 - Emergency interception installed outside
9 - Ball cock
10- Anti-vibration joint
11- A couple of flange
GENERAL
These are forced-draught burners with gas/air mixtures
at the combustion head. They are suited to working with
forced-draught or low pressure burners according to the work cur
-
ves. They bring together great flame stability, total safety and a whole
new level of performance. The burner has a Lamtec electronic cam
(ETAMATIC model) controlled by a microprocessor for intermittent
running, for control and monitoring of gas draught burners with
electronic modulation and air-gas adjustment motors, as well as
possible fan motor inverters. When running as an automatic burner,
valve seal control is integrated into the system as is power regulation
and carbon monoxide levels (read the ETAMATIC instructions at the
end of the enclosed manual to better understand how it works).
DESCRIPTION OF OPERATIONS ON FLAME
MODULATION
The attainable capacity variation field is,
indicatively,
from 1 to
1/5 with respect to the maximum capacity stated on plate. Ignition is
preceded, as provided for in the regulations, by pre-ventilation of the
combustion chamber. The pre-ventilation stage for the combustion
chamber takes place with the air damper at the large flame position.
At the end of the pre-ventilation stage, the air combustion air damp-
ers are brought back to the ignition flame position. If the pressure
switch for the pre-ventilation air pressure shows sufficient pressure,
the ignition transformer is switched on and then the gas valves switch
on and the burner starts up.
The quantity of gas delivered (m
3
/h)
can be adjusted acting on the flow regulator of the SKP 25 valve.
The flame then appears, detected by the control device (UV photo-
electric cell) that permits completion of the ignition stage with the
switching off of the ignition transformer.
The pilot circuit switches off after the main valves have opened.
The burner is thus at the point of ignition (ZP, P0). The flame is de
-
tected by the infra-red detector. The programmer relay goes beyond
the lock-out position and causes the servo-motors to regulate the air
gas mix and the inverter is kept at minimum (P1). If the modulation
probe permits (adjusted to a temperature or pressure that is lower than
that in the boiler), the air-gas regulating servo-motors start to rotate
and cause a steady increase in the gas supply, the combustion air
and the motor’s revs increase to the maximum for which the burner
has been adjusted (P9).
N.B. The ETAMATIC electronic cam controls the burner by activating
the combustion air and gas servo motor as well as, where
used, the inverter for the fan motor according to a work curve
with 10 set points (see ETAMAC adjustment curve).
The burner stays at its maximum supply position until the tempe
-
rature or pressure reaches a sufficient level to activate the probe
that causes the air-gas supply regulation servo motors to turn in the
opposite direction to gradually reduce the gas supply, the correspon
-
ding combustion air and the number of motor revs (to minimum). If
the pressure or temperature limit is reached even at the minimum
delivery for which the full stop device is adjusted (thermostat or
pressure switch), the burner will be stopped by the action of the stop
device. By lowering the temperature or pressure below the level at
which the stop device intervenes, the burner is switched back on
at the previously described programme.
During normal working the modulation probe applied to the boiler
will detect the change in demand and automatically adjusts the
supply of combustion air by switching on the air-gas adjustment
servo motor with increased or decreased rotation. This operation
enables the air-gas delivery system to balance the amount of heat
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