Landi Ranzo Cng Kit

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Description of parts, their function and instllation

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  • GB

    RIDUTTORI TN1 B SIC

    TN1 B SIC REGULATORS

    REDUCTORES TN1 B SIC

    MANUALE INSTALLAZIONE E REGOLAZIONEINSTALLATION AND ADJUSTMENT MANUALMANUAL DE INSTALACIN Y REGULACIN

    I

    E

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    Fig. 1

    Fig. 2

    I

    Technical drawingsGB Schemi tecnici Esquemas tcnicosE

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    KEY (FIG. 1)A Gas outlet tube;B Idling supply tube (the tube is not installed on the

    reduction unit but is supplied separately as itsuse is recommended only when there is acarburation vacuum in the main tube from idlingsupply to off-idle. If used, always line it up in thesame direction as the gas outlet tube;

    C Sensitivity regulator;D Idling electrovalve positive contact;E Idling regulator;F High pressure electrovalve;G Gas inlet joint;H Fluid heating joint;I cap 2nd stage.

    1. SPECIFICHE TECNICHEAn electronically controlled device which redu-ces the pressure of methane allowing a regularflow of gas for every requirement of the engine.It is fitted with three stages of methane reductionwhich ensures stability at both high and low feedpressures, and with a high pressure electrovalveupstream of the 1st stage. Heat absorption, carriedout by elements of the reduction unit heated byliquid from the cooling circuit of the engine, preven-ts the methane freezing in the pressure fall stage.The flow of gas necessary for the engine at idleis at positive pressure from the second stage andis distributed via a gas conduit separate from themain flow.Included is an electronic device for starting witha built-in safety system which closes the gaselectrovalve in cases where the engine is switchedoff, even accidentally.

    SPECIFICATIONS:Type of reduction unit: 3 stage with electronicstarting device and positive pressure idling.Use: autodriveType of fluid: CNG (Compressed methane gas)Body: GDALSI 13 UNI 5079Heating: liquid from engine cooling circuitTest pressure: 300 barInlet pressure: 220 bar1st stage adjustment pressure: 3,5-4 bar2nd stage adjustment pressure: 1,5 barPower supply: 12 V c.c.High pressure electrovalve coil power : 20WIdling electrovalve coil power: 18W

    2. FUNCTIONING OF THE REDUCTION UNIT (Fig. 2)With the electrovalve (1) open, the methane gasenters the 1st stage chamber (4). The pressureexerted by the gas on the walls of the chamberdilates the membrane (8), overcoming the resi-stance of the spring (9). The membrane (8) atta-ched to the lever (3) acts on the 1st stage valve (2),creating a pressure equilibrium.From the 1st stage chamber (4), the gas passes tothe 2nd stage (11)and the flow is delivered by thepressure exerted by the gas on the membrane(10), regulating the opening and closing of thevalve (13). Depressurisation of the engine activa-tes an axial movement of the 3rd stage membrane(6) which, connected to the lever (5), causes theopening of the valve (7). Through the outlet (19),the gas enters the engine.Sealing of the valve (7) is obtained by correctcalibration of the spring (14). The starting andidling device comprises an electrovalve (17) con-trolled by an electronic device. The needle (15) isdisplaced and frees the jet (18), the gas from thesecond stage (11) exits, thus permitting the engineto function at idling speed.

    If the engine is switched off, the coil is deactivatedand the needle (15) closes the outlet jet (18).Adjustment of the idling speed is carried out via theadjuster (16). When the engine is started, theelectronic device activates the coil (17), the nee-dle (15) frees the jet (18) and allows the amountof gas necessary for starting to pass through.

    LegendSpecification

    GBOperation GB

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    Details: the following photographs show theroute of the methane with blue arrows A, with redarrows B the forces exerted and with yellowarrows C the internal channels for the passage ofthe methane.

    Figure 3 shows the TN1B SIC methane reductionunit; the blue arrows show the flow of methaneat the inlet (on the left) and outlet (at the top).It is a 3-stage reduction unit. That is to say, itconsists of two high-pressure stages (the firstreduces to 4.5 bar, the second to 1.5 bar) and afinal stage which operates at low pressure.

    Figure 4 shows the 1st stage.The pressure here is kept constant by the strengthof the spring which presses down by the effectof the pressure below the membrane, whichpushes upwards (where the cover is located).Under the plate note how the methane enters the1st stage (at the rim) and progresses to the second(blue arrows).

    In practice the methane enters the stage. From theeffect of pressure, a force is generated whichpushes the plate upwards, but there is a springabove it\: the opposing force pushes the platedown and with corresponding force generates aforce in the stage of 4.5 bar (approximately), theposition of the lever shown in figure 5 closes thegas inlet orifice (in the rim).

    The transit channel through which the methanepasses to change stage is shown by the whitearrow on the left in figure 6.

    In the second stage, the pressure is lowered stillfurther to 1.5 bar, again by means of a springopposing a lever figure 7 (arrow on right). Whenmethane enters, the plate indicated by the arrowon the left swells, then generates a force upwar-ds, which is however opposed by a downwardforce generated by the spring shown in figure 7.

    Fig. 3

    Fig. 4

    Fig. 5

    Fig. 6

    A

    A A

    B

    A

    OperationGB

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    This generation of two opposing forces results inthe lever closing the methane inlet orifice shownin figure 9 (the blue arrows show the circulationof methane passing from the second stage tochannel leading to the third stage).Seal is ensured by valve B.

    Figure 9 also clearly shows the passage ofmethane from the inlet to the third stage channeland to the idling tuble.

    Fig. 7

    Fig. 8

    Fig. 9

    Fig. 10

    Fig. 11

    C

    A

    A

    B

    B

    A

    A

    A

    A

    C

    A

    The flow of methane in the functioning of theengine at idling speed is effected by means of thesmall tube indicated in figure 10 with a yellowarrow. The lever to which the membrane is fixedis indicated by the large arrow.

    Regulation of the quantity (which is possible withthe SIC reduction unit) is carried out by means ofthe regulator located on the front of the reductionunit.

    OperationGB

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    Fig. 12

    Fig. 13

    Fig. 14

    Fig. 16

    B

    CAB

    B

    A

    B

    A

    By screwing in (reduction of the quantity of gas)or unscrewing of the regulator (increase in thequantity of gas) the conical seat of the regulatorallows the gas to pass through the larger jet(coming from the channel shown by the yellowarrow in figure 11) and to proceed to the small jet(see blue arrow) which connects with the idlingspeed tube. The seal of the regulator is effectedwith an O-ring.

    The third, low pressure, stage consists of amembrane fixed to the steel lever in figure 10 byan aluminium plate. In practice this stage is con-nected to the engine via the gas outlet tube whichgoes to the mixer, and is thus subject to depres-sion generated within itself by the operating of theaccelerator butterfly valve.

    Acceleration creates a force (whose vector isindicated by F in figure 13) which pushes themembrane towards the interior of the reductionunit thus, by means of the orifice below shown infigure 15, allowing the passage of the methaneinto the third stage and finally it is breathed outof the reduction unit towards the mixer and goes

    Fig. 15

    to feed the engine. The sensitivity of the springwhich supports the lever is controlled by the brassregulator located on the side of the reduction unit.In figure 16, the blue arrows show the gas flowat idle (small arrow) and off idle (larger arrow).The circle in figure 15 indicates the valve whichmakes a seal when the lever is closed (that is,when the depression of the engine is weak.

    Operation GB

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    Figure 17 shows the methane outlet tube. Figure18 shows the pressure reducer and the feed tubeto the mixer (directly on the finned body.

    Fix withM10 screws

    Fig. 19

    Fig. 20

    Position of the reduction unit

    NO

    YES

    NO

    NO

    Discharge capFig. 18

    Fig. 17

    A

    A

    A

    3. GENERAL INFORMATIONWhen installing the reduction unit, the followinginstructions must be observed. supplied with the reduction unit are the mountingbrackets for locating the reduction unit in theengine compartment. These should be adapted tosuit the type of compartment.

    Notices GB

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    install the reduction unit in the engine compart-ment as close as possible to the point at which themixer unit is installed, fixing it securely to thebodywork with the screws provided; install the reduction unit outside the compartmentcontaining the equipment for collecting air for theventilation and heating of the drivers compart-ment; install the reduction unit at a distance of not lessthan 150mm from the exhaust pipes and silencer.If this distance is less than the minimum stated, butmore than 75mm, a sheet of metal not less than1mm thick must be placed between the componen-ts; position the reduction unit parallel to the directionof the vehicles motion, and in a vertical position,so that it is easily accessible for adjustment andmaintenance; ensure that the reduction unit is loca