SPARGAS 11 P - Burner BALTUR - Free user manual and instructions

USER MANUAL SPARGAS 11 P BALTUR

N° 0002470601 Rev. 17/07/97

The burner is equipped with a mounting flange which slips on the burner head. When applying the burner to the boiler, itis necessary to correctly position the flange so that the burner head enters the furnace to the extent specified by the boiler manufacture. When the burner has been correctly fa- stened to the boiler, proceed with connecting in to the gas pipeline. The dimensions ofthe gas adduction pipeline should be in function with it's length and with gas delivery according to UNI regulations (see diagram BT 1387 reported on the last page of the handbook). Itmust be perfectly hermetic and adequately tested be- fore the burner is general inspection. Itis indispensable to install a suitable pipe union in the pipeline, in proximity to the burner, to allow for easy di- sassembly of the burner and opening of the boiler door. The DUNGS mod. MB... valve incorporates a filter and a gas pressure stabilizer and, therefore, only a cut-offcock and an anti-vibration joint have to be fitted onto the gas adduction pipeline. Only ifthe gas pressure were above the maximum value allowed by regulations (400 mm. W.C.) would it be necessary to install a pressure reducer on the gas pipeline outside the heating plant. We advise installing a bend directly onto the burner gas ramp before applying the removable fitting. This layout makes it possible to open the boiler door, ifthere is one, after the fitting itself UPPER UIEU BOILER GATE

DOOR DIRECTION DOUR OPENING À 8871GB.tf has been opened. The above is clearly illustrated in the following drawing (see BT 8871/GB).

ELECTRICAL CONNECTIONS The electric lines should be at an adequate distance from hot parts. It is advisable to make all connections with flexible electric wire. Minimum section of conductors 1.5 mm°2. (CEI 64/8 3.1.07).

DESCRIPTION OF OPERATIONS

Switch off the general switch, if the thermostats are off, and voltage goes to the command and control device which, after a short interval (9 second), will start uf the burner according to the set program. The fan motor goes into operation and makes the combustion chamber preventilation. At the end of the preventilation phase, the ignition procedure will then start and, after 3 seconds, the safety valve and “first flame” (pilot light) valve will open up. À flame will then apper, which will be detected by the flame control device, thus completing the ignition procedure. The air shutter control servo will then be switched on, which will move to the second flame setting, as set by the operator in each specific case, and atthe same time an auxiliary contact on the servo will activate the second flame valve. Ifthe flame does not light, the burner will go into the “safety shutdown” state, 3 second after the opening ofthe gas valves (pilot and safety). If a “safety shutdown” occurs, the gas valves will be closed immediately. To go out ofthe shoutdown state, press the red button on the burner unit.

NATURAL GAS STARTING UP AND REGULATION

(for LPG operation see the relative chapter) In order to proceed with starting up, its necessary, ifthe burner is three-phase, to check that the sense of rotation of the motoris correct. Ifnotalready done so atthe momentof connecting the burner to the gas pipeline, it's indispensable to carry a purge ofthe air contained in the pipeline. AS à precaution, special care should be taken and doors and windows should be opened. O pen the pipe union on the pipeline situated near the burner and then open a little the cut-off cock (or cocks).When the characteristic odour of gas can be smelled, close the cut-off cock. Wait until the gas present in the room has dispersed, and then reconnect the burner to the gas pipeline. Then proceed as follows:

1) Make sure that the discharge of combustion products can take place freely (chimney lock-gates should be open)

and thatthere is water in the boiler.

2) Open as much as considered necessary, the combustion air regulator, (see “servomotor for regulating air shutter

type LKS 120-02 (B5-5-51)") and open by about one third the air passage between the head and the flame disk (diffuser) (see “Regulation of the combustion Head”).

3) Operate the regulators incorporated in the gas valves in such a way as to obtain the gas delivery presumed

4) Disconnect the 2nd flame thermostat and give current to the burner by opening the main switch.

The burners is then turned on and carries outthe pre-ventilation phase. Ifthe air pressure exceeds that value at which the air pressure switch has been set, the ignition transformer will be connected and, subsequently, the gas valves (safety and 1‘ flame) will be inserted. The valves open completely and gas delivery is limited to the position at which the flow regulator incorporated in the 1“ flame (pilot) valve has been manually regulated. At first ignition, successive “shut downs” could occur, due to the following reasons: a - The gas pipeline has not been adequately purged of air and therefore the quantity of gas is not sufficient to allow for a stable flame. b - A “shut down” with flame presence could be caused by flame instability in the ionisation zone, due to and incorrect air/gas ratio. This can be remedied by varying the quantity of air and/or gas delivered, in order to find the correct ratio. Itcould also be caused by an incorrect distribution of air/gas in the combustion head. This can be corrected by operating the regulation device of the combustion head by closing or opening more the air passage between the head and the gas diffuser. See chapter “regulation of the combustion head”. c-Itcould happen thatthe ionisation currentis help up by the current discharged from the ignition transformer (the two currents have to run the same course on the burner's "earth”) and so the burner goes to “shut down” due to insufficient ionisation. This can be remedied by inverting the input (220V side) of the ignition transformer (change the places of the two wire thattake voltage to the transformer). A shut down with flame presence could also be caused by the burner's casing not being properly “grounded”. We must point out that the minimum value of the ionisation current to ensure the working of the control box is shown in the electrical diagram; normally the ionisation current is decidedly higher. To check the ionisation current, connect a microammeter with an adequate scale “in series” to the ionisation circuit. The cable of the ionisation electrode is equipped with a connector (see circuit diagram) to facilitate the micro-ammeter connection. The high isolation wire that comes from the electrode must be inserted to the negative (sign -) of the microammeter. p24

5) With the burner on, adapt delivery to that desired (methane gas = 8550 Kcal/m?) by reading the meter. Take two

readings, the second one exactly one minute after the first one. The difference between the two readings schould be multiplied by in order to obtain the flow per hour (60 minutes). This output can be modified by operating the special regulator incorporated in the valve (see the last pages for a desciption of how to regulate the valves).

6) Control that combustion occurs correctly by using the appropriate instruments (CO, = about 10% for methane gas

7) After regulation, turn the burner off and on again several times to check that ignition occurs correctly.

With the burner disconnected from the main switch, connect the 2" flame thermostat and regulate the special device on the servomotor in such a way as to obtain an opening of the air shutter presumed necessary for the 2° flame (see BT 8920/1). Open as wellthe gas flow regulator incorporated in the valve to allow for the correct delivery presumed necessary for the 24 flame (main flame).

8) Now close the main switch to start up the burner. When the burner has started up it is necessary to check, as

previously shown, the gas delivery and the combustion with the appropriate instruments. When the results are known, if necessary, proceed with varying the gas delivery and the relative combustion air in order to adapt delivery to that required for the specific case (boiler potentiality). Itis also necessary to check ifthe CO, and CO values are adequate (CO, max. = about 10% for Methane gas and CO =0.1%).

9) Control the efficiency of the safety devices: the “shut down” (by detaching the ionisation electrode

cable), the air pressure switch, the gas pressure switch, the gas pressure switch and the thermostats). N.B. The pressure switch is self-controlled and trefore it must close the contact, which is foreseen to be closed at rest, (fan stops and consequently there is an absence of air pressure in the burner); ifit does not, the control box will not be inserted (the burner remains at as standstill). It must be specified that ifthe contact is not closed during working, the control box will carry outits cycle, but the ignition transformer will not be inserted and the gas valves will not open. Consequently, the burner will go to shut down. Check thatthe air pressure switch functions properly with burner operating at 15 flame only, increase the regulating value until it reaches intervention point and the burner should go to shut down. To ublock the burner, press the special pushbutton and return the pressure switch regulator to a sufficient value in order to measure the air pressure existing during the pre-ventilation phase.

AIR REGULATION ON THE COMBUSTION HEAD

(see BT9481/1 and BT9485/2) The combustion head is equipped with a regulating device which closes and opens the air passage between the disk and the head. By closing the passage it's possible to achieve high pressure upstream the disk for low inputs as well. High velocity and turbulence ensure a better penetration in the fuel, an optimum mixture and good flame stability. It might be necessary to have high air pressure upstream the disk in order to avoid flame pulsation and it's considered practically indispensable when the burner is operating with a pressurised furnace and/or thermal load. It's evident from the above, that the device which closes the air on the combustion head should be put in such a position as to always obtain a decidedly high air pressure value behind the disk. Its advisable to regulate in such a way as to achieve a closing ofthe air on the head: this will necessitate a considerable opening of the air shutter which regulates the flow to the burner's fan suction. Obviously, these adjustments should be carried out when the burner is operating atmaximum delivery desired. In practice, start regulating by putting the device which closes the air on the combustion head in an intermediate position, start up the burner and make trial adjustments as previously described. When maximum delivery desired has been reached, proceed with correcting the position of the device which closes the air on the combustion head; move it backwards or forwards in such a way as to obtain an air flow suitable to the delivery, with the air regulation shutter in suction considerably open. When reducing the air passage on the combustion head, avoid closing it completely. N.B. Check that ignition occurs regularly, because if the passage between the disk and the head is closed, it could occur that the air velocity is so high as to render ignition difficult. If this happens, gradually open the regulator until it reaches the correct position and ignition occurs regularly. This position should be definitive. It should alsobe remembered that, for the 1‘ flame, it is preferable to limit the quantity of air to that which is strictly indispensable in order to have safe ignition even in the most difficult circumstances. ps4

MAINTENANCE The burner does not require special maintenance, but it is good practice to check periodically that the gas filter is clean and that the ignition electrode is efficient. It is also necessary to verify that the ignition electrode's spark is produced between the same electrode and the disk. The combustion head may need cleaning. During re-assembly, special attention must be paid to centring exactly the electrodes (ignition and flame detection) in order to avoid them going to earth or short-circuiting which would result in the “shut down” of the burner.

The burner operates fully automatically, therefore it is non necessary to carry out any kind at adjustment during its operating. The “block” position is a safety position reached by the burner automatically when some ofthe components ofthe burners or the plant do not work properly. Itis necessary to check then whether the cause to the problem is à dangerous one before unblocking the burner. The causes to the block may be temporary, for example when air in inside the pipes. When it is unblocked, the burner starts operating properly. Ifthe burner stops three or four times at a stretch, itis necessary either to loock for the problem and solve itor ask for the intervention of the after sales service. The burner can remain in the “block” position without any limit in time. In emergency cases itis advisable to close the fuel valve, and to disconnectthe burner electrically. p:4

Type summary The type references contained in the following table refer to LMG.... With no plug-in base and with no flame detector. For ordering information on beses and other accessories, refer to “Oréening”. Type offlae detector | Fyperelerence LMG2.. | w | H | TSA | En | & UT UC | 1 [ ne Echaviorin the 5 s 5 5 s s Ê s s | eventoffiame fait. min. |_min. | max. | ca. | ea | ca. |min.1) | max à max? dur. operat Burner controis for pre-purging with low flame air volume, without aciuator control Detector electrode (FE) |LMG21.130A27 &) 25 | 7 E 2 2 8 E = Lockout lor UV detector ORA. LMG21.230A27 4) 25 | 20 3 2 2 E 5 = Lockout pwith AGQ2...A27 LMG21.830A27 4) 25 30 El 2 2 B 5 = Lockout LMG21.350A27 4) 28 | 40 5 4 2 10 5 = Lockout LMG2+.B50A27 4) 25 _| 50 5 4 È Tù 5 = Lockout Burner controls for pre-purging with nominal air volume, with actueter control Detector electrode (FE) [LMG22.130A27 3} 25 | 7 3 2 El El El ET Lockout or UV detector OPA... LMG22 280427 4) 25 | 20 5 A 3 8 8 [és és Lockgut with AGO2..A27 LMG22 23807 25 | 20 E 2 El El 3 3 {| 30 Lockout LMG22.830A27 4} 25_] 30 3 2 El E 3 ER ET Lockout LMG22.380A270 4) 8 557] 30 3 z 3 8 3 ES ENT] ockout Burner controls for pre-purging with low flame sir volume, without sctustor control Detector electrode (FE) [LMG25.230A27 25 |] 20 3 3 z E E = Max 3 repart. or UV detector QRA... LMG25.33027 25 | 30 E 2 2 E $ = Max. 3 ropet. with AGC2...A27 LMG25.350A27 2.5 30 5 4 2 30 E = = Max. 3 repet, Legend w Waïing time T4 Interval «TSAEnde-B V2» or «BV1-LR» # Checked pre-purge time Tiè Specified time for air pressure signal TSA Ignition safety time TEL Programmed opening time for actuator «SA» 5 Pre-ignition time T2 Programmed closing time for actuator «SA» Tan Iénition time during <TSA» 1} Max. 65 5 #4 Also suited for use with direct fired air heaters 2 Max. running time available for actuators «SA», 5 Without integral fuse: use anly in connection with bases the actuators running time must be shorter AGKS6... or with anextemal microfnse of max, 6.3 A (slow) É] Also suited for use with flash-steam generators Functions LMG21.../ LMG25... LMG22... A E LÉ La D A 8 Lu Le D seinrw/eP OZ serve nm © a ] ® à AL ET TT Ê Ï m Lo] & nm © z T na [Ko] 2 © Bwt © sa | È Ÿ (o] ve F IT & ei Lo) & TT Lo] LR) Bv2 I il © Fe (o] Le @ EK2 she ee [om + rs oO TE ER mA 1© Ts ul 00 [lame pue ces | réosaoeans Legend A Start command (switching on by «R») B-B° Interval for establishment of flame € Operating position of burner rached CD Bumer operation (heating praduction) D Contralled shutdown by R» + Burner is immediately shut down + Bumer control is immediately ready for new startup AL Faut status signal (alarm) M Fan motor BV... Fuel valve R Control thermostat / pressurestat EK2 Remote reset button SA Actuators FS Flame signal sB Safety limit thermostat GP Gas pressure monitor W Limit thermostat / pressure monitor LP Air pressure monitor Z Ignition transformer LR Load controller

Prerequisites for startup Undervoltage Checked intermittent operation Reversed polarity protection Control program in the event of fault Lockout Resetting the LMG2... Operating concept # Burner control is reset + All contacts in the line are closed

Safety shotdown in the event — the mains voltage is lower than typically AC 160 V — a restartis made when he mains voltage exceeds AC 195 V After no more than 24 hours of continuous operation, the burner control iniriates a safery shutdowmn, followed by a restart. Ifthe connections of line {terminal 12} and neutral (terminaï 2} have been exchanged. the . bumer control will initiate lockout at the end of «TS As.

#_Ifputs will immediately be deactivated {< 1 s) ®_ On restoration of power, a restart will be made with the full program sequence If the operating voltage drops below the undervoltage threshold (for threshold, refer to <Functions»). a restart will be made with the full program sequence #_fthereis a premature faulty flame signal during «tl» = Lockout If de contact of the air pressure monitor «LP» has welded in the working position: prevention of startup and, after 65 seconds, Iockout #_Ifthe contact of ihe air pressure monitor «LP» has welded in the idle position: lockout at the end of «10» #_Efthereis no air pressure on completion of «t10» = Lackout #_Ifthe bumer does not ignite during «TSA» = Lockout If flame is lost during operation = LMG21.../LMG22. lockour = LMG25... three reperitions Lockout cannot be changed and takes place 10 seconds afier safety shutsown. À mains voltage failure during that period of time leads to a restart. When lockout occurs, the bumer control can immediately be reseg! In that case, keep lockout reset button depressed for a minimum of 0.5 seconds and a maximum of 3 seconds! Bumer contral has initiated lockout ° Resct = Red fault LED on Press Iockout reset button for 0.5.2 + Diagnosis of cause of fault — Wait>10s — Press lockout reset buiton for > 3 5 — Read blink code of red fault LED = «Error code table» Burner control in operation + Rest = Green lame signal LED on Press lockout reset button for 0. + Read flame establishment üme — Press lockout reset button for > 3 s — Read blink code of green flarue signai LED = «Error code table» pad

Diagnosis of cause of fault Interrogation of flame establishment time After lockout, the red fault LED is steady on. For reading the cause of fault, refer to the blink code given in the following table: Press lockout reset button LED on {waiting tima > 10 5) mr>3s Rink code Li Blink code Fault Approx ? Error code table Blink code Possible cause 2 xblink No establishment of flame at the end of «TSA» “ — Faulty or soiled detector electrode — Faulty or soiled foel valves — Poor adjustment of bumer 3xblink + Airpressure monitor dons notclose . — LP» feuity — «LP» incorrectiy adjusted “Fan motor does not run 4 x bike + Air pressure monitor does not open or extraneous light on burner startup .… — LP» fully — «LP» incorrectly adjusted 5 xblink + Extrançous light during pro-purging Lou — Or internal device fault 7x blinke 2 Loss of flame during operation L — Poor adjustment of bumer — Faulty ar soiled fnel valves — Short-cireuit between detector electrode and ground

18 x blink + Air pressure monitor opens during pre-purging or operation Lsscond — «Po incorrecily adjusted een — Four times loss of flame during operation (LMG25) 19 x blink + Faulty output contact Rhone — Wiring error

• —_ Extèmel power supply on output terminal 20 x blinke + Intemal device fault + sussnsuss During the img he cause of the faule is diagnosed, the control outputs are deactivaled. The bumer remains shut down Exception: fault status signal «AL» at termina 10 The bumer is swätched on only after a reset is made. Press lockout reset button for 0.5.3 seconds This function measures the flame establishment time with ionization supervision. With th AGQ2.., this function cannot be used. In the running position, the green flame signal LED is steady on. The flame establishment time is read in the running position according to the following sequence: Press lockout reset LED on baton for >3s Blink code Of Blinkcode Green LED on = ie) or = I F FS AL Operation Approx 3s When reading the flame establishment time, the bumer is put out of operation. Reading is in the form of a blirk code as multiples of 0.4 s. pr4

[_Piagnosties table Flame establishment time with | Flame establishment time with TSA»>=3s <T$A»=5s Lxblink <û4s <04s 2x link <08s <08s 7xblink <28s £28s 12 x blink = £<48s 9: The flame establishment time is the period of time from the moment «BV» opens io the moment the flame signal is detected for the first time The flame establishment time remains stored for one startup sequence and is re-ascertained the next time he burner is started up During the period of time the flame establishment time is interrogated, the fault sta outputs are deactivated: - Burmer remains chat down His restarted only after a resct is made - Press lockout rcsct button for 0.5.3 seconds Note: Q) Ifignition and ionization electrode are not correctly located, ignition effects on the detector electrode may lead to incorrect measurements. Flame supervision with detector electrode At raains voltage UN = AC 230 V Detector vollage across temminals 1 and 2 or ground AC 115.230 V {AC volimeter Ri > 10 MO) J Switching thresholds (limit values) Switching on (flame on) DC ammeter, Ri £ 5 KO) 2DC1pA Switching off (flame off) DC ammeter, Ri< 5 kQ) <DC OS uA Requested sensor current for reliable operation >2uA Max. short cireuit current across terminals 1 ACSOpA and 2 or ground (AC ammeñer, Ri £ 5 k£2) Note: (e With the same flame quality, the detector current with LMG2.. is lower than with LGE2... Flame supervision takes place by making use of the conductivity and rectifing effect of hot flame gases. The flame signal amplifier responds only to the DC current compenent of the flame signal. æ À shor-cicuit between detecior elecmode and ground causes the bumer to inïiae +ockout Measurement cirouit Legend C. Electrolytic capacitor 100.470 pF: DC 10.25 V HE- Detector electrode M- Micrometer (Ri mex. = 5000 Q) pod

1- Locking screw for 1st and 2nd flame regulators

2- Cover for regulating screw of pressure stabilizer(only for version BO1)

3- Gas pressure switch (minimum)

5- _ Pressure tap at gas entry

7-_ Pressure tap after pressure stabilizer (Pa)

8- Principle valve (1st and 2nd flame)

9- Regulating ring 1st flame delivery

10- Regulating knob 2nd flame delivery

11- Protective cover (can be used as a knob) of

regulating device for the initial rapid release.

12- Gas pressure switch (maximum) (only for version B02 and B01 S50)

Note: to increase delivery, rotate the delivery devices in an anti-clockwise direction; to decrese delivery, rotate them in a clockwise direction. The versions B02 and B01 S50 are employed with liquid gas (LPG) ps4

The monobloc DUNGS Model MB-ZRDLE is made up of: a) Minimum gas pressure switch (3) and maximum gas pressure (12) b) Gas filter (6) c) Pressure regulator (stabilizer) (2) (only for version BO1) d) Safety valve (incorporated in the pressure regulator) which opens and closes rapidly (4) e) Principle valve with two positions (1st flame and 2nd flame) which opens slowly with an adjustable initial rapid release and rapid closing (8). Before proceeding with regulation, read the following:

1) Itis possible to reach the gas filter (6) in order to clean it, by removing one of the two side closing plates.

2) The pressure stabilizer can be regulated from 40 to 200 mm.W.C. by manoeuvring its regulating screw. It can be

reached by sliding the cover (2) to one side. The and viceversa is about 60 turns. Do not force againstthe end-of- the-run position. Before starting up the burner, give the screw at least 15 turns towards the + sign. Around the screw are arrows with symbols which indicate the sense of rotation to increase the pressure (in a clockwise direction) and the sense of rotation to decrease pressure (in an anti-clockwise direction). The stabilizer hermetically closes from “upstream”to “downstream” when there is no gas flow. Different springs to obtain different pressure values form those described above are not foreseen. To requlate the pressure stabilizer, connect a water manometer to the rubber tube holder installed on the valve, to tap Pa (7), in correspondence with the stabilizer exit.

3) Itis not necessary to regulate the rapid opening and closing safety valve (4).

4) Principle valve (8).

Regulating the initial rapid release effects the 1st and 2nd opening positions of the valve. Regulation ofthe rapid release and of the hydraulic brake modify the 1st and 2nd positions of the valve in proportion to the output regulated. To carry out regulation, unscrew the protection cover (11) and use the back partofitas a tool to turn the pin. Rotation in a clockwise direction = minor rapid release Rotation in an anti-clockwise direction = greater rapid release REGULATING THE FIRST POSITION (1ST FLAME) Loosen the screw with the protruding cylindrical head (1) Give the knob (10), which regulates the output for the 2nd flame, at least one turn in the direction ofthe arrow which indicates the + sign (anti-clockwise direction). ATTENTION: Ifthis knob which regulates the 2nd flame is not given atleastone turn towards the +sign, the valve will not open in the 1st position. Rotate the regulating ring (9) ofthe 1stflame in the direction indicated by the arrow towards the +sign (anti-clockwise direction). As an indication, this should be a little more than two turns from the end-of-the-run position. Then, when the 1st flame only is alight, rotate adequately ring (9) in order to obtain the gas delivery desired. The complete run ofthe output regulator, from the - position to the + position, and viceversa, is aboutthree and a half turns. Rotation ofthe regulator in a clockwise direction, determines a reduction in delivery; rotation in an anticlockwise direction increase delivery. REGULATING THE SECOND POSITION (2ST FLAME) Loosen the screw with the protruding cylindrical head (1) Rotate the knob (10) in the direction indicated by the arrow for the + sign (anti-clockwise direction) as considered necessary in order to obtain the gas delivery required for the 2nd flame. The complete run of the regulator from the - position to the + position, and viceversa, is about FIVE turns. Rotate in a clockwise direction to determine a reduction in delivery and in an anti-clockwise direction to increase it. After requlatinq the qas delivery for the 1st and 2nd flame,remember to tighten home the screw (1) to avoid the requlatormoving out of the position at which it has been set. FI—— N DETAILS OF TERMINAL BOARD [Fe | JL FOR VALVE MB-ZRDLE... ——— 1st POSITION D pm POSITION VALVE INLET MAX PRESSURE ADJUSTTABLE OUTLET PRESSURE TYPE OF GAS MODEL (PE) mbar FROM THE STABILIZER (PA) mbar MB ..B01 S 20 200 from 4 to 20 Gas maturale B..B01S 50 360 from 4 to 50 L.P.G MB … BO2 360 L.P.G.

We think it would be useful to inform you on a few points regarding use of liquid propane gas (L.P.G.).

1) Approximate evaluation of running costs

a) 1 m° of liquid gas in gaseous state has heating power inferior by about 22.000 Kcal. b) to obtain 1 m° of gas about 2 Kg of liquid gas are required. This is equal to about 4 litres of liquid gas. According to the above, itcan be deduced that by using liquid gas (L.P.G.) the followingapproximate equivalence is obtained:

22.000 Kcal =1 m° (in gaseous state) =2 Kg of L.P.G. (liquid) =4 litres L.P.G. (liquid). From this, running costs

Liquid gas (L.P.G.) has, in it gaseous state, a specific gravity superior to that of air (specific gravity of propane gas in relation to air = 1,56) and therefore does not disperse in air like natural gas, which has a lower specific gravity (specific gravity of natural gas in relation to air = 0,60), but precipitates and spreads at ground level as if it were a liquid. In view ofthe above principle, the Ministero dell'Interno ( Home Office) has setlimitations for use of Liquid Gas in circular n° 412/4183 of 6 February 1975. We will look into the points we think most important: a) Liquid Gas (L.P.G.) for burners and/or boilers can only be used in rooms above ground and overlooking open spaces. Installations using liquid gas in basements or cellars are not permitted. b)Rooms where liquid gas is used must have ventilation inlets without closing devices, located on external walls with a surface of at least 1/15 of the room's area and a minimum of 0,5 m2. Atleast one third ofthe entire surface ofthese inlets must be located in the lower part of the external wall, flush with the floor.

3) Requirements for liquid gas plant to ensure correct operation and safety

Natural gasification, from cylinder unit or tank, can only be used for low power plant. Supply capacity at gaseous stage, depending on tank dimensions and minimum external temperature, is shown in the following table but only as a rough guide. Minimum temperature -15°C -10 °C - 5°C -0°C +5 °C Tank 9901. 1,6 Kg/h 2,5 Kg/h 3,5 Kg/h 8 Kg/h 10 Kg/h Tank 3000 1. 2,5 Kg/h 4,5Kg/h 6,5 Kg/h 9Kg/h 12 Kg/h Tank 5000 1. aKkg/h 6,5 Kg/h 11,5 Kg/h 16 Kg/h 21Kg/h With the exception of low power plant, for correct operation and safety, itis always essential to install a suitable liquid gas heater (vaporiser) immediately in front of the pressure reducer. The vaporiser is a container built in accordance with Regulations. It has a control thermostat which heats liquid gas by means of an electric resistor or circulation of hot fluid. Reduction of pressure and change of state (from liquid to gas) considerably lowers temperature. In the cold season, the latter easily reaches values of much less than zero degrees. Any humidity (water) by change present in the liquid gas would change into ice and thus impede correct operation of the reducer (blocked in open position)with consequences that can easily be imagined. The vaporiser must be installed very near to the reducer to avoid already cooled gas, picked up in liquid form from the tank, reaching the reducer. Without the vaporiser, itis practically impossible to ensure correct supply of gas in gaseous state in the cold season. Pressure reduction can be carried out by means of a suitable pressure reducer. Widespread use is also made of plant with two-stage pressure reduction because: a)itreduces risks of freezing and condensation b) Pipe diameter between the first and second reducers can be less than that required for single stage reduction. Considerable cost saving can be achieved for large scale networks. c) Final pressure value is more constant. bu4

For two-stage reduction, install the first reducer near the tank (or atthe vaporiser outlet), which reduces pressure to approximately 1 bar. A second pressure reducer is installed outside, before the boiler room and reduces pressure to the boiler supply value (usually 300 mm.W.C. = 0,03 bar).For natural gasification, the first-stage regulator must be installed so that any condensate discharges into the tank. Itis necessary to protect this pressurereducer whith a proper filter in order to avoid that any impurities, unexpectedly, reach the reducer thus endangering the correct working. It is impostant to point out that the usual filters do not have a cartridge (filter element) enough resistent to this pressure. We can recommend, as à sugges- tion, to use a common “steam filter" foritis provided with a filter element suitable to undergo very hight pressure, see the fig.. Use a filter having at leat the same size as the diameter ofthe gas intake tube. Itis also necessary to point out that the usual gas filter must be installed near the burner. GPLOLTIF GENERAL DIAGRAM FOR TWO-STAGE L.P.G. N°BT 8721/2GB PRESSURE REDUCTION FOR BURNER OR BOILER Rev.21/03/90 Pressure gauge and pressure take-of 2end stage reducer 2 Output=30 mber spprox=0, 03 kg/cm' Cspacity-sbout double of the maximum required by the user Filter Anti-vibration Burner Filter coupiing {steam model) set stage d reducer Qutput=ebout ! Pipe fitting E #ù ibar=1kg/cm n CT Capacity 1 7 l'adequate i 1 = ï (pe. ssao | 2end stage reducer Gutput=sbout 30mbar=0, 03kg/cm° Filter Capacity=sbout double the maximum required by the user A Boiler (floor or wall fitting) Note: Do not cover pipes and reducers 7 With insulsting materisl b:4

4) Pipe dimension table in accordance to UNI-CIG 7129-72 norms

Capacity in volume (consumption) in m°/h for propane (L.P.G.) with density of 1,56 (according to UNI 7128- 72), calculated for a maximum load loss of 0,5 mbar. Outer diameter 3/8 Gas | Gas |3/4 Gas | 1Gas | 17, Gas | 12Gas 2Gas | 2% Gas | 3Gas Inner diameter * mm |13,2 16,6 22,2 27,9 36,6 41,5 53,8 69,6 81,8 Flow rate m°/h 2 15 2,7 6,0 ll 23 35 E = E 4 1,0 1,8 4,1 7,4 15 24 45 82 135 6 0,80 1,5 3,2 6,1 12 19 35 66 108 8 0,70 1,3 2,8 5,2 10,6 16,4 30 58 92 10 0,60 1,1 2,6 4,7 9,5 14,5 27 52 81 Virtual 15 0,50 0,90 2,0 3,8 7,6 11,5 21,5 43 65 length m 20 0,40 0,78 1,7 3,2 6,4 9,8 18,4 36 55 25 0,32 0,69 1,5 2,9 57 8,7 16,1 32 49 30 Ê 0,62 1,4 2,6 Si 8,0 14,7 29 45 40 Ê 0,55 12 2,2 4,5 6,8 12,5 25 38 50 Ê 0,46 1,05 2,0 3,8 6,1 1,1 22 34 60 Ê = Ê 1,8 5) 55 10,0 20 30 80 Ê = Ê 15 3,0 4,6 8,6 17 26 100 Ê = Ê = 2,7 4,2 7,6 15 23

• Inner diameter of pipe UNI 3824-68 taken as basis for calculation. For pressure loss of 1 mbar flow rates must be increased by 45%; For pressure loss of 2 mbar flow rates must be increases by 110%.

The burner must be ordered specifically for use with liquid gas (L.P.G.) so that it is equipped with gas valves of sufficient dimensions to ensure correct ignition and gradual regulation. Our valves have dimension is planned for use at a supply pressure of about 300 mm.W.C. We suggest gas pressure be checked at the burner by using a water column pressure gauge. N.B. Maximum and minimum burner pressure (kcal/h) obviously remains that of the original natural gas burner (L.P.G. has heating power superior to that of natural gas. Therefore, in order to burn fully, it requires air quantity in proportion to the thermal power created).

6) Combustion control

To limit consumption and avoid serious trouble, adjust combustion by using the appropriate instruments. It is absolutely essential to check thatthe percentage of carbon monoxide (CO) does notexceed maximum permitted value of 0,1 % (use à phial analyser or other similar instrument). Please note that our guarantee does not cover burners operating on liquid gas (L.P.G.) in plant for which the above measures have not been taken. OPERATING ANOMALY

TYPE OF IRREGULARITY PROBABLE CAUSE RIMEDY

The burner does not start. 1) Lack of currente. 1) Check the fuses ofthe feed line. Check the fuses ofthe

2) Gas does not reach the bumner. control box. Check the line of the thermostats and the

2) Checkthe opening ofthe detecting devices located along

the feeding pipes. The burner starts butthe flame | 1)The gas valves do not open 1)Check the valves operation does not ignite. The burner 2) There is no spark at the electrode. 2) Check the operation of the ignition transformer. Check stops consequently. the position of the electrodes ends

3) The air pressure switch does not give | 3) Check the setting and operation of the air pressure

its consent to the control box. switch. The burner starts and the flame | 1) The control electrode does not detector | 1) Check the position of the control electrode. Check the ignites then the burnes stops. detects the flame improperly. valve of the ionisation current. bs4

Advertencias SE SENS vaporizzatore / vaporizer / vaporisateur / verdunster / vaporizador Warnings - The vaporizer is considered a dangerous point and should therefore be situated at a safe distance from any building. - The electrical system must be AD-EP (anti-deflagration- explosion proof]. - The L.P.G. pipelines must be made ofSS steel with welded or flanged joints NP 40 (nominal pressure 40 bar). Threaded joints are prohibited. Specific materials

1) Liquid recovery valve.

2) Liquid delivery cock with flow limiter.

3) Steel fitting with welded tang and copper washer.

4) 18 bar safety valve with welded steel fitting.

Hinweise - Der Verdunster wird als Gefahrenpunkt betrachtet, er mu& deshalb in einem Sicherheitsabstand von den Geräten angebracht werden. - Die elektrische Anlage mu explosionssicher sein - Explosionsprobe. - Die Flüssiggasleitungen müssen aus Stahl mit nahtlos geschweiBten oder geflanschten PN40-Verbindungen {Nominaldruck 40 bar) sein. Gewindeverbindungen sind verboten. Erläuterungen