background image

37

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 flame & Start

of Modulation

in seconds

20

DESCRIPTION OF TWO STAGE PROGRESSIVE OPERATION (BT...DSPN) (See BT 8712/2)

We refer to a two-stage progressive operation because the passage from the 1st flame to the 2nd flame (from the
minimum rate to the maximum pre-established rate) takes gradually and therefore the amount of combustion air
and fuel delivery are increased very gradually.
During the fuel oil pre-heating phase, voltage passes through the regulation thermostat of the pre-heater and
reaches the relay coil of the resistances.
The relay closes and takes current to the resistances which, in turn, heat the fuel contained in the pre-heater.
The minimum thermostat of the pre-heater closes when the temperature reaches the value at which it has been
set. The control box will be connected only when the temperature in the pre-heater reaches the value at which it
has been set and causes the resistances to be disinserted (an opening of the contact of the regulation thermostat);
therefore, the fuel oil in the pre-heater should be at maximum temperature.
The control box (cyclic relay) of the burner is therefore connected by the regulation thermostat of the pre-heater
when it excludes the resistances by disinserting the relative relay.

Control box specifications

The cyclic relay control box carries out the ignition programme by starting up the fan motor in order to effect the
pre-ventilation phase. If the air pressure supplied by the fan is sufficient to cause the intervention of the relative
pressure switch, the pump motor will be turned on immediately and will carry out a pre-circulation of hot oil in the
burner pipes. Oil from the pump reaches the pre-heated to the correct temperature and when it comes out it
passes through a filter before reaching the atomizer unit. The hot oil circulates in the atomizer unit without coming
out of the nozzle because the passages 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 their seats by strong springs which are situated at the opposite ends of the rods.
The oil circulates, comes out of the atomizer group return, goes through the sump where the TRU thermostat is
inserted and arrives at the return pressure regulator; it passes through this and reaches the pump return and from
there is discharged into the return. Hot oil circulation, as described above, is carried out at a pressure value
slightly higher (some bar) than the minimum pressure at which the return pressure regulator has been set
(10 ÷ 12 bar). The duration time of the pre-ventilation and oil pre-circulation phase is 22,5 seconds.
This time can be extended (theoretically indefinitely) because a special device in the electric circuit does not allow
the ignition programme to be carried out until the temperature of the fuel in the nozzle return pipeline has reached
the temperature at which the TRU thermostat (thermostat on the nozzle return) has been set.
This special device does not allow the fuel to pass through the nozzle until it has reached at least the temperature
at which the TRU thermostat has been set. Normally, intervention of the TRU thermostat takes place within the
pre-ventilation time 22,5 seconds); if it does not, pre-ventilation and fuel oil pre-circulation are extended until the
intervention of the TRU thermostat. The intervention of the TRU thermostat (oil in circulation sufficiently hot)
allows the control box to proceed with carrying out the ignition programme by inserting the ignition transformer
which in turn feeds the electrodes with high voltage. High voltage between the electrodes primes the electric
spark for ignition of the fuel/air mixture. 5 seconds after the ignition spark appears, the control box carries voltage
to the magnet, which by means of appropriate levers, moves backwards the two rods which intercept the flow
(outward and return) of fuel to the nozzle. This moving backwards of the rods also determines a closing of the
passage (by-pass) inside the atomizer unit. Consequently, the pump pressure is taken to the normal value of
about 20 ÷ 22 bar. Deviation of the two rods from the closing seat, now permits the fuel to enter the nozzle at the
pressure at which the pump has been regulated at (20 ÷ 22 bar), and comes out of the nozzle adequately atomized.
The return pressure, which determines delivery to the furnace, is regulated by the return pressure regulator.
The value of the ignition flow rate (minimum delivery) should be about 10 ÷ 12 bar).
The atomized fuel which comes out of the nozzle is mixed with air supplied by the fan and is then ignited by the
spark of the electrodes. Flame presence is detected by the photoresistant. The programme proceeds and, after 5
seconds, surpasses the “shut down” position, disconnects the ignition, and then connects the delivery regulating
circuit (fuel/air).

Summary of Contents for BT 75 DSPN /D

Page 1: ...ere attentamente quanto esposto nel capitolo AVVERTENZE PER L UTENTE PER L USO IN SICUREZZA DEL BRUCIATORE presente all interno del manuale istruzioni che costituisce parte integrante ed essenziale de...

Page 2: ...ner and service it The works on the burner and on the system have to be carried out only by competent people The system electric feeding must be disconnected before starting working on it If the woeks...

Page 3: ...to EC or UNI Standards for gas burners or the gas part of duel fuel burners gas light oil or gas heavy oil when such burners have been ordered in non compliance with the EC Standard or Italian UNI Sta...

Page 4: ...lato un bruciatore o una caldaia per evitare che si creino situazioni pericolose come la formazione di miscele tossiche ed esplosive Per chiarire meglio la situazione facciamo un esempio Per bruciare...

Page 5: ...1 Allorch si decida di non utilizzare il bruciatore per un certo periodo chiudere il rubinetto o i rubinetti di alimentazione del combustibile Avvertenze particolari per l uso del gas Far verificare d...

Page 6: ...M12 N 4 M16 N 4 M16 N 4 M16 DADI ESAGONALI HEXAGONAL NUTS ECROUS HEXAGONAUX N 8 M12 N 8 M16 N 8 M16 N 8 M16 ROSETTE PIANE FLAT WASHERS RONDELLES PLATES N 8 M12 N 8 M16 N 8 M16 N 8 M16 TUBI FLESSIBILI...

Page 7: ...Air regulation servomotor 1 Photor sistance 2 Transformateur d allumage 3 Vis r glage air la t te de combustion 4 Thermostat retour buse 5 Valve r glage de pression 2e flamme 6 Pressostat air 7 Moteur...

Page 8: ...8 N 0002921710 N 0002921700 CAMPO DI LAVORO WORKING FIELD CHAMP DE TRAVAIL CAMPO DI LAVORO WORKING FIELD CHAMP DE TRAVAIL...

Page 9: ...mentazione deve essere realizzato come da nostri disegni n BT 8511 5 oppure BT 8513 6 anche quando si impiega combustibile con bassa viscosit Il dimensionamento delle tubazioni deve essere effettuato...

Page 10: ...10 SCHEMA IDRAULICO DI PRINCIPIO PER BRUCIATORI A DUE FIAMME O MODULANTI FUNZIONANTI CON OLIO COMBUSTIBILE MAX 15 E A 50 C N BT 8511 5 ITALIANO...

Page 11: ...11 SCHEMA IDRAULICO DI PRINCIPIO PER PI BRUCIATORI A DUE FIAMME O MODULANTI FUNZIONANTI AD OLIO COMBUSTIBILE DENSO MAX 50 E A 50 C CON RISCALDATORE AUSILIARIO N BT 8513 6...

Page 12: ...li di chiusura applicati all estremit delle aste Detti spilli sono premuti contro le sedi da robuste molle situate all estremit opposta delle aste L olio circola ed esce dal ritorno del gruppo polveri...

Page 13: ...aia a vapore della caldaia si avvicina al valore regolato sul termostato o pressostato del 2 stadio che determina il richiamo del motore di comando della modulazione in senso inverso al movimento prec...

Page 14: ...ritorno La sopra descritta circolazione di olio caldo si effettua ad un valore di pressione un po pi alta qualche bar rispetto alla pressione minima a cui regolato il regolatore della pressione di rit...

Page 15: ...burente resta al valore massimo fino a quando la temperatura pressio ne se caldaia a vapore della caldaia si avvicina al valore regolato e determina il richiamo del motore di comando della modulazione...

Page 16: ...0 12 bar MAX 18 20 bar 11 SERVOMOTORE DI MODULAZIONE COLLEGAMENTOAL CIRCUITO DI ALIMENTAZIONE VEDI 0002901120 8511 6 8513 7 PER UNO O PI BRUCIATORI 12 DISCO COMANDO REGOLAZIONE ARIA COMBUSTIBILE 13 SE...

Page 17: ...o interporre tra la stessa e la caldaia una protezio ne isolante con spessore di almeno 10 mm Per infilare la flangia isolante che deve essere interposta tra il bruciatore e la piastra di caldaia occo...

Page 18: ...tro sul preriscaldatore che il funzionamento dei termostati avvenga correttamente Regolare a circa 50 C il termostato di comando della resistenza incorporata nel filtro di linea 10 Mettere in funzione...

Page 19: ...delle viti che comandano il combustibile per ottenere quanto sopra specificato Precisiamo che la massima erogazione si ottiene quando la pressione di ritorno di circa 2 3 bar inferiore alla pressione...

Page 20: ...one come esposto precedentemente Quando si raggiunta l erogazione massima de siderata si provvede a correggere la posizione della testa di combustione spostandola in avanti o indietro in modo da avere...

Page 21: ...la spia di blocco Per controllare l efficienza della fotoresistenza e del blocco operare come segue a Mettere in funzione il bruciatore b Dopo almeno un minuto dall avvenuta accensione estrarre la fot...

Page 22: ...ire la caldaia e se necessario anche il camino da personale specializzato fumista una caldaia pulita ha maggior rendimento durata e silenziosit VARIANTE PER BRUCIATORE PROVVISTO DI PRERISCALDATORE A V...

Page 23: ...ura approssimativa corrispondente C 120 127 133 138 143 147 151 155 158 164 169 174 A regolazione effettuata chiudere la saracinesca di scarico aria I termostati minima e regolazione del preriscaldato...

Page 24: ...uto ogni anello rosso pu ruotare rispetto alla scala di riferimento L indice dell anello rosso indica sulla rispettiva scala di riferimento l angolo di rotazione impostato per ogni camma Indice di rif...

Page 25: ...25 APPARECCHIATURA DI COMANDO E CONTROLLO LAL N 7153 Rev 07 1996...

Page 26: ...26 N 7153 Rev 07 1996 APPARECCHIATURA DI COMANDO E CONTROLLO LAL...

Page 27: ...27 N 7153 Rev 07 1996 APPARECCHIATURA DI COMANDO E CONTROLLO LAL...

Page 28: ...28 N 7153 Rev 07 1996 APPARECCHIATURA DI COMANDO E CONTROLLO LAL...

Page 29: ...29 N 7153 Rev 07 1996 APPARECCHIATURA DI COMANDO E CONTROLLO LAL...

Page 30: ...30 N 7153 Rev 07 1996 APPARECCHIATURA DI COMANDO E CONTROLLO LAL...

Page 31: ...31 N 7153 Rev 07 1996 APPARECCHIATURA DI COMANDO E CONTROLLO LAL...

Page 32: ...32 N 7153 Rev 07 1996 APPARECCHIATURA DI COMANDO E CONTROLLO LAL...

Page 33: ...Scala dei valori assoluti per impostazione del tempo all interno del del campo selezionato 3 LED di visualizzazione dello stato di funziona mento U T Tensione di alimentazione LED acceso tempo trascor...

Page 34: ...t the maximum level fuel supply called for by the boiler The supply circuit must be built according to our drawings n BT 8511 5 or BT 8513 6 even when low viscosity fuel is being used Pipe dimensions...

Page 35: ...35 BASIC HYDRAULIC DIAGRAM FOR MULTIPLE TWO FLAME OR MODULATING BURNERS USING FUEL OIL MAX 15 E AT 50 C N BT 8511 5 ENGLISH...

Page 36: ...36 BASIC HYDRAULIC DIAGRAM FOR MULTIPLE TWO FLAME OR MODULATING BURNERS FUNCTIONING WITH DENSE FUEL OIL MAX 50 E AT 50 C AND AUXILIARY HEATER N BT 8513 6...

Page 37: ...thermostat is inserted and arrives at the return pressure regulator it passes through this and reaches the pump return and from there is discharged into the return Hot oil circulation as described abo...

Page 38: ...d stage is aware of load variations in the boiler and automatically requests the servomotor regulating delivery fuel air to make an adjustment in the fuel delivery and in the relative combustion air W...

Page 39: ...eaches the nominal level of about 20 22 bar As the rods move away from their closing seats fuel can then enter the nozzle at a pressure of 20 22 bar set on the pump and flow adequately atomized out of...

Page 40: ...OSING PINS 7 BY PASS HOLES 8 CLOUSING SPRING 9 OPENING ELECTROMAGNET 10 RETURN PRESSURE REGULATOR MIN 10 12 bar MAX 18 20 bar CONNECTION AT THE FUEL FEEDING DIAGRAM FOR ONE OR MORE BURNERS SEE 0002901...

Page 41: ...if the burner has to be disassembled If the plate is not thermally insulated you should fit insulating protection at least 10 mm thick between it and the boiler In order to fit the insulating flange w...

Page 42: ...gulation thermostat should be set to a temperature 15 20 C higher than the minimum level thermostat After igniting the burner check that thermostats operate correctly by reading the thermometer on the...

Page 43: ...upply occurs at the end of the modulation movement This is necessary for modulation to operate gradually You may have to change the position of the fuel control screws to achieve this Maximum supply o...

Page 44: ...ng with the combustion head in an intermediate position start up the burner and make a first adjustment as previously described When maximum delivery desired has been reached proceed with correcting t...

Page 45: ...s the lock pilot lamp lights up To check efficiency of the photoresistance and the locking operation proceed as follows a ignite the burner b At least a minute after ignition remove the photoresistanc...

Page 46: ...reduction in the dimension of the pre heater When the burner starts up cold fuel oil would be forced to pass through the coil of the steam pre heater still cold because it would not yet have been hea...

Page 47: ...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 48: ...ning B Insertion and disinsertion lever motor connection Camshaft Position 1 Disinsertion Position 2 Insertion To modify the regulation of the 3 cams utilized operate the respective red rings A Z M By...

Page 49: ...49 N 7153 Rev 04 1996 INSTRUCTIONS LAL CONTROL BOX...

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Page 55: ...55 N 7153 Rev 04 1996 INSTRUCTIONS LAL CONTROL BOX...

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Page 57: ...ot flash in these fields 2 Scale of absolute values for setting the time inside the selected field 3 Status display LED U T Electrical supply tension LED on time passed or stopped LED flashing time de...

Page 58: ...aux doit tre effectu en fonction de la longueur de ceux ci et de la capacit de la pompe utilis e Nos dispositions ne concernent que ce qui est n cessaire au bon fonctionnement Les prescriptions observ...

Page 59: ...e r cup ration huile chaude dimensions pr vues pour contenir les r sistances de chauffage en aucun cas inf rieures diam tre 150 hauteur 300 doivent tre install s le plus pr s possible du br leur une h...

Page 60: ...as 0 5 m par rapport la pompe de ce dernier Manom tre R glage de pression R glable de 0 5 2 bar By pass chauffeur auxiliaire Serpentin de r chauffement huile combustible vapeur ou eau chaude Flexibles...

Page 61: ...pression minimum sur laquelle est param tr le r gulateur de la pression de retour 10 12 bar Cette phase de pr ventilation et de pr circulation de l huile dure 22 5 secondes Cette dur e peut tre prolon...

Page 62: ...nd e par la chaudi re N oubliez pas que le champ de variation de la port e r alisable avec une bonne combustion est d environ 1 1 3 par rapport la port e maximum indiqu e sur la plaquette Note Le pres...

Page 63: ...ce et est allum par l tincelle des lectrodes La photor sistance indique la pr sence de la flamme Le programmateur poursuit et apr s 5 secondes d passe la position de blocage coupe l allumage puis met...

Page 64: ...3 17 bar 22 2 20 bar anneau de tenue en Viton r sistant l huile et la temp rature chambre de turbulence retour combustible entr e combustible orifice sortie combustible orifices retour combustible N...

Page 65: ...est pas pourvue d isolation thermique il vous faut interposer entre elle et la chaudi re une protection isolante d au moins 10 mm d paisseur La bride isolante doit tre interpos e entre le br leur et l...

Page 66: ...umez le br leur et contr lez l indication du thermom tre plac sur le pr chauffeur de fa on vous assurer que les thermostats fonctionnent correctement R glez le thermostat de commande de la r sistance...

Page 67: ...iez la position des vis qui commandent le combustible de fa on obtenir la situation d crite ci dessus Nous pr cisons que la distribution maximum est obtenue lorsque la pression de retour est inf rieur...

Page 68: ...position interm diaire Allumez le br leur en effectuant un r glage selon les indications fournies plus haut Lorsque la distribution maximum d sir e est atteinte corrigez la position de la t te de com...

Page 69: ...par le programme l appareil se bloque Vous ne pouvez d bloquer l appareil qu en appuyant sur le bouton de d blocage sblocco Proc dez au moins deux fois l essai d efficacit du blocage 3 Contr lez l eff...

Page 70: ...si la buse avec une pression insuffisante Pour viter cela le pr chauffeur est quip d un r seau de by pass commande manuelle qui permet lorsqu il est ouvert de ne pas traverser le serpentin voir BT 857...

Page 71: ...ur lorsqu il est froid 6 Pr chauffeur lectrique 7 Filtre AUTONETTOYANT 0 3 mm 8 Thermom tre 9 Thermostats minimum Pr chauffeur 10 Thermostats maximum Pr chauffeur 11 Thermostats r glage Pr chauffeur 1...

Page 72: ...au rouge dans le sens d sir pour tourner par rapport l chelle de r f rence L indice de l anneau rouge indique l angle de rotation appliqu chaque came sur l chelle de r f rence R f rence Arbre cames Ca...

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Page 85: ...clignote pas 2 Echelle des valeurs absolues pour la programmation du temps l int rieur de la plage s lectionn e 3 DEL d affichage de l tat de fonctionnement U T Tension d alimentation DEL allum e temp...

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Page 96: ...ur it Il presente catalogo riveste carattere puramente indicativo La casa pertanto si riserva ogni possibilit di modifica dei dati tecnici e quant altro in esso riportato Technical data in this brochu...

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