baltur 66875410 Instruction Manual Download

Page: 56 / 88

12 / 42

0006080764 _201312

N° 0

ENGLISH

FUNCTIONAL dESCRIPTION

WITH LIqUId FUEL

Turn the main isolating switch “q1” to on: the power indicator light

will come on. Turn the start / stop switch “S1” to on: power reaches

the “LFL ...” control box at terminal “1” . The cyclic relay equipment

carries out the ignition program by starting the fan motor for the

pre-ventilation phase.

If the air pressure provided by the fan is enough to cause the

corresponding pressure switch to intervene, it will do so immediately, as

well as the motor of the pump that sends the diesel oil to the burner ducts.

Diesel oil from the pump reaches the atomizer unit and is forced to

circulate within it because the passage leading to the outward and

return nozzles are closed. This closure is carried out by “closing pins”

applied to the ends of the rods. These “pins” are pressed against

the seats by strong springs placed on the opposite end of the rods.

The diesel oil circulates, comes out of the atomizer unit return pipe

and arrives at the return pressure regulator. It passes through this

and reaches the pump return pipe and from there it is discharged

back into the return pipe.

The diesel oil circulates at a slightly higher pressure (a few bars)

than the minimum pressure which the return pressure regulator is set

to (10 ÷ 12 bar). The diesel oil’s pre-ventilation and pre-circulation

stage duration is not that provided for by the equipment because it

is carried out with the air damper in its open position.

The pre-ventilation and pre-circulation time is given by the total time

of the operations below:

•  output servomotor opening stroke (fuel/air) +
•  pre-ventilation time set in the equ
•  closing stroke of fuel/air supply adjustment servo motor up to

ignition air position.

The equipment subsequently goes through its ignition program

enabling the ignition transformer and then the flame ignition valves

with gas (pilot). The high tension between the electrode and the

burner mass causes the electrical discharge (spark) that ignites the

gas/air mixture. Flow is regulated by the flow regulator incorporated

in one of the two ignition flame valves (pilot). The presence of the

flame is detected by the UV photocell.

If the UV photocell does not detect the flame then the

burner locks out. When more than one burner is operating

in the combustion chamber, you must make sure that the

UV photocell of one burner does not detect the flame of the

other. This condition is achieved by installing the photocell

on a swinging support so that it can be positioned in such a

way as to prevent the interference described above.

HYDRAULIC DIAGRAM

1  FILTER
2  HOSE
3  BURNER PUMP (20-22 BAR)
4  PRESSURE GAUGE 0-40 BAR
5  MODULATION SERVOMOTOR
6  DISK WITH SCREWS FOR AIR/FUEL SUPPLY REGULATION
7  DISK WITH ADJUSTMENT SCREWS FOR OPENING AND

CLOSING AIR SUPPLY TO HEAD

8 AIR PRESSURE SWITCH

9  RETURN PRESSURE REGULATOR MIN 10-12 bar MAX 18-20 bar
10  PRESSURE GAUGE 0-40 BAR
11  REDUCTION UNIT OR (PILOT) PRESSURE STABILISER
12  GAS MINIMUM AND MAXIMUM PRESSURE SWITCH WITH

(PILOT) PRESSURE INTAKES

13 IGNITION FLAME SAFETY GAS VALVE (PILOT)
14 MAIN GAS VALVE FOR IGNITION FLAME

CONNECTION

TO SUPPL

Y CIRCUIT

SEE BT

8666-3