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11

ELECTRIC CONNECTIONS

The burner electrical connections have been kept to a minimum. We recommend that all connections are made of
flexible electric wire. Electric lines must be installed at a suitable distance from hot parts.
Make sure that the electric line you wish to connect to the apparatus is fed with voltage and frequency values suitable
for the burner. Make sure that the main line, the relative fuse switch (fuses are essential) and the limiting device, if any,
are suitable for bearing the maximum current absorbed by the burner.

DESCRIPTION OF OPERATION 

 (see BT 8713/1)

During the fuel oil pre-heating stage, voltage passes through the pre-heater regulation thermostat and reaches the coil
of the resistances remote switch. This remote switch shuts and takes current to the pre-heater resistances, which heat
the fuel contained in the pre-heater. The resistances heating the pump, the unit for atomizing fuel and regulating first-
flame return pressure are also cut-in, through the panel ( I ) switch.
The pre-heater minimum level thermostat shuts off when the temperature reaches the value at which the pre-heater is
set. The equipment is only cut-in when the temperature at which resistances are cut-out (opening of the regulation
thermostat contact) is reached in the pre-heater. This is therefore achieved when fuel oil in the pre-heater is at maximum
temperature. The burner control box (a cyclic relay) is then cut-in by the heating tank regulation thermostat when the
latter cuts-out the resistances by switching off the relative remote switch.

Control box specifications

The control box cyclic relay carries out the ignition programme, by putting into operation the fan motor for executing
the preventilation stage. If the pressure of the air supplied by the fan is sufficient to put the relative pressure switch
into action, cutting in also occurs of the motor of the pump that carries out hot oil pre-circulation in the burner pipes.
Oil from the pump reaches the pre-heater, passes through it, reaching the temperature envisaged, exits through a
filter and then reaches the atomizing unit. The oil circulates in the atomizing unit without flowing out of the nozzle
because the channels leading towards the nozzle (outward flow) and from the nozzle (return flow) are closed. Closure
is carried out by “closing cones” fixed to the rod ends. These “cones” are pressed against their seats by strong
springs located at the opposite end of the rods. Oil circulates and flows out of the return end of the atomizing unit,
passes through the trap where the TRU thermostat is and reaches the 1st flame return pressure regulator, passes
through it, goes through the 2nd flame solenoid valve (usually open), reaches the pump return pipe and from this it
discharges into the feed system return pipe. Hot oil circulation as described above is carried out at slightly higher
pressure (a few bar) compered to the minimum pressure at which the 1st flame return pressure regulator is set (10 ÷
12 bar). This oil precirculation and preventilation phase lasts 22,5 seconds. This time can be prolonged (infinitely, in
theory) because the electric circuit is built in such a way that it does not enable the control box to continue carrying out
the ignition programme, until the fuel temperature, in the nozzle return piping, has reached the level at which the TRU
thermostat is set. This particular design does not allow fuel to pass through the nozzle until the fuel itself reaches at
least the temperature at which the TRU thermostat is set. Usually, the TRU thermostat operates within normal
preventilation time (22,5 seconds), otherwise the fuel oil preventilation and pre-circulation stages are prolonged until
the TRU goes into action. TRU operation (oil circulating is sufficiently hot) enables the control box to continue executing
the ignition programme, by cutting-in the ignition transformer which feeds high voltage to the electrodes.
High tension between the electrodes triggers the electric charge (spark) to ignite the air-fuel mixture.
2,5 seconds after the ignition spark begins, the control box takes voltage to the magnet which, through suitable
levers, moves back the two rods that intercept the flow of fuel (outgoing and return) to the nozzle. The moving back of
the rods also closes the by-pass inside the atomizing unit, and consequently pump pressure reaches the normal level
of about 20 ÷ 22 bar. Withdrawal of the two rods from the closure seats now enables fuel to enter the nozzle at a
pressure of 20 ÷ 22 bar set at the pump and to exit the nozzle, sufficiently atomized.
Return pressure, which determines oil flow to the combustion chamber, is now regulated by the 1st flame return
pressure regulator.

Control box
&  relative
Programmer

LAL 1.25
Cyclic relay

Safety Time
in seconds

5

Pre-Ventilation & Oil
Pre-circulation Time
in seconds

22,5

Pre-ignition Time
in seconds

2,5

Post-ignition
Time
in seconds

5

Time between
1st  and 2nd
flames
in seconds

20

Summary of Contents for BT 75 DSNM-D

Page 1: ...en BT180DSNM D BT250DSNM D BT300DSNM D BT350DSNM D 2004 11 Cod 0006080092 BT 75DSNM D BT100DSNM D BT120DSNM D Instruction for burners model Edition...

Page 2: ...re delegato Dott Riccardo Fava Read carefully the instructions before starting the burner and service it The works on the burner and on the system have to be carried out only by competent people The s...

Page 3: ...R Transformador voltios TENSIONE TRIFASE 220 380V 220 380V 220 380V 220 380V VOLTAGE Tensi n THREEPHASE trif sica 50 Hz 50 Hz 50 Hz 50 Hz RESISTENZA PRERISCALDATORE kW 10 5 kW 10 5 kW 10 5 kW 15 kW PR...

Page 4: ...RIFASE 220 380V 220 380V 220 380V VOLTAGE Tensi n THREEPHASE trif sica 50 Hz 50 Hz 50 Hz RESISTENZA PRERISCALDATORE kW 18 kW 25 5 kW 28 5 kW PRE HEATER RESISTANCES resistencia precalentador FLANGIA AT...

Page 5: ...TCH 8 2nd FLAME ELECTROVALVE usually open 9 1st FLAME PRESSURE REGULATOR VALVE HEATING RESISTANCES 10 PUMP MOTOR 11 PRE HEATER 12 BURNER FIXING FLANGES 13 INSULATING GASKET 14 COMBUSTION HEAD 15 FAN M...

Page 6: ...0 DSNM D 910 460 450 550 400 150 1445 210 400 230 195 275 M16 240 BT 120 DSNM D 910 460 450 640 480 160 1385 185 450 230 195 275 M16 240 BT 180 DSNM D 1035 545 490 800 600 200 1635 200 535 260 220 340...

Page 7: ...7 WORKING FIELD N 0002921710 N 0002921701 WORKING FIELD...

Page 8: ...oth when the burner is not operating and when the burner is in operation at the maximum fuel output level requested by the boiler The feed circuit must be built according to our drawings n BT 8511 6 o...

Page 9: ...TEAM COIL OR HOT WATER TO HEAT THE OIL 15 HEAVY OIL HEATING COIL STEAM OR HOT WATER 16 HUB DIAMETER 100MM HEIGHT 300MM HEATING ELECTRICAL LEAD IF NECESSARY N B The thank for recovery of hot oil diamet...

Page 10: ...ten the nuts too much During this operation tightening of the flange locking nuts keep the body of the burner lifted so that the combustion head is kept in a horizontal position Remarks The burner is...

Page 11: ...against their seats by strong springs located at the opposite end of the rods Oil circulates and flows out of the return end of the atomizing unit passes through the trap where the TRU thermostat is...

Page 12: ...it is a steam boiler reaches the level set at the 2nd flame thermostat pressure switch in case of steam boilers and operates the thermostat by bringing the 1st flame back into operation The return mo...

Page 13: ...uge 0 5 2 bar Pump Degasifier and hot oil recovery Air regulation gates Air gate control motor Opening magnet 2nd flame solenoid valve usually open Access to setting screws 1st flame return pressure r...

Page 14: ...Suction 1 4 Vacuum meter connection Return Pump plate Delivery nozzle 1 4 Pressure gauge connection Heating element seal Pump pressure regulation 20 22 bar Suction Return Delivery nozzle Pump plate 1...

Page 15: ...alve Opened 1st flame switched on regolator Closed 1st flame switched off regulator Tie down point pressure gauge to get the backpressure which cause the output variation for the 1st and 2nd flame Pum...

Page 16: ...g pressure to about 1 bar 11 Remove the plug on the vacuum gauge connection point of the pump and then slightly open the gate on the fuel supply pipe Wait until fuel out of the hole without any air bu...

Page 17: ...closure of the air passage between head and disk This way high pressure at the pre disk position can be obtained even at low flow Consequently high pressure and air turbulence enable better air penetr...

Page 18: ...tton sblocco unlock Locking can also be caused by temporary inconveniences water in the fuel air in the pipe lines etc if you unlock the burner in these cases the burner starts up without any snags If...

Page 19: ...in order to keep working pressure sufficiently constant Two flame burners are required for pressurized boilers where combustion chamber pressure is higher than atmospheric pressure in order to give su...

Page 20: ...he following a gate valve a suitable pressure reducer adjustable from 1 to 8 bar and a control manometer end of the scale 10 bar Do not recuperate the condensate which is discharged from the heater to...

Page 21: ...EATER WHEN IT S COLD 6 ELECTRIC PRE HEATER 7 SELF CLEANING FILTER 0 3 MM 8 THERMOMETER 9 MIN PRE HEATER THERMOSTAT 10 MAX PRE HEATER THERMOSTAT 11 PRE HEATER ADJUSTER THERMOSTAT 12 THERMOMETER 13 PLUG...

Page 22: ...1 rev 09 04 87 2 3 4 1 Motor cam shaft coupling cutting out pin The switching off of the motor and shaft connection can be obtained by pushing 1 2nd Flame valve connection cam must be adjusted in a po...

Page 23: ...23 INSTRUCTIONS LAL CONTROL BOX N 7153 Rev 04 1996...

Page 24: ...24 INSTRUCTIONS LAL CONTROL BOX N 7153 Rev 04 1996...

Page 25: ...25 INSTRUCTIONS LAL CONTROL BOX N 7153 Rev 04 1996...

Page 26: ...26 INSTRUCTIONS LAL CONTROL BOX N 7153 Rev 04 1996...

Page 27: ...27 INSTRUCTIONS LAL CONTROL BOX N 7153 Rev 04 1996...

Page 28: ...28 INSTRUCTIONS LAL CONTROL BOX N 7153 Rev 04 1996...

Page 29: ...29 N 7153 Rev 04 1996 INSTRUCTIONS LAL CONTROL BOX...

Page 30: ...30 N 7153 Rev 04 1996 INSTRUCTIONS LAL CONTROL BOX...

Page 31: ...flash in these fields 2 Scale of absolute values for setting the time in side the selected field 3 Status display LED U T Electrical supply tension LED on time passed or stopped LED flashing time del...

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Page 40: ...7 11 Fax 051 685 75 27 28 International Tel 39 051 684 37 1 1 Fax 39 051 683 06 86 http www baltur it http www baltur com E MAIL info baltur it Technical data in this brochure are given as information...

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