Landi Renzo CN04 Guida

MANUALE INSTALLAZIONE E REGOLAZIONE PAG. 3

MANUEL AND ADJUSTMENT MANUAL PAGE 9

INSTALLATION AND ADJUSTMENT MANUAL PAGE 6

EGUIA INSTALLACION Y REGULACION PAGE 13

RIDUTTORI ‘CN04’ METANO

‘CN04’ CNG PRESSURE REGULATORS

DETENDEURS ‘CN04’ GAZ NATUREL

REDUCTORES ‘CN04’ GAS NATURAL

LANDI RENZO S.p.A.

RID. METANO CN04 / CN04 CNG REG. / RED. CN04 GAZ NATUREL / RED. CN04 GAS NATURAL

2/16

Technical Drawings

Schemi Tecnici Schémas Techniques

Esquema Técnicos

Fig. 1 - Ver. CN-04P cod. 536261000 -

Fig. 3

Fig. 2 - Ver. CN-04B cod. 536260000 -

24 F

CN-04B

CN-04P

LANDI RENZO S.p.A.

Installationand adjustament manual CN04

6/16

Legend

Specification

Thank you for purchasing this LANDI RENZO

version ‘CN04’ pressure regulator, a reliable and

technologically advanced device for the conver-

sion of vehicles with catalytic converter and engi-

ne with fuel injection system or carburettor to

methane. Correctly installed it will give its user

many years of excellent service To ensure that you

obtain the maximum performance from your con-

version system, please read these installation and

adjustment instructions carefully.

LEGEND (FIG. 1-2)

A) Gas outlet

B) Throttle adjustment screw.

C) Solenoid valve positive and negative contact.

D) Safety valve.

E) Water outlet connector to attach to an engine

water circuit outlet pipe.

F) Water inlet connector to attach to a return pipe

of the engine water circuit.

G) Gas Inlet.

H) Bleed tap.

I) Pressure sensor.

1. TECHNICAL SPECIFICATION

Electronically controlled device that reduces the

methane pressure, permitting a regular flow of gas

for all engine demands. It is equipped with three

pressure reduction stages, providing stability at

both high and low supply pressures, as the amount

of gas supplied changes, and a low pressure

solenoid valve upstream of the third stage. Heat

absorbed from the pressure regulator elements

heated with the engine cooling circuit fluid ensures

that the pressure regulator does not freeze during

the pressure drop phase. The flow of gas needed

for the engine to idle is activated by a dedicated

solenoid valve, and supplied through the main flow

gas pipe. Equipped with an electronic starting

device incorporating a safety system that interve-

nes to close the gas solenoid valve when the

engine is turned off, including accidentally.

CHARACTERISTICS:

Methan pressure pressure regulator with 3 reduc-

tion stages.

Application:

automotive traction, suitable for vehicles with ca-

talytic converterr and engine with fuel injection

system or carburettor.

Fuel type:

CNG (Compressed methan gas).

Heating:

by engine cooling fluid.

Operating temperature:

from -40° TO 120°C.

Supply voltage:

12 volts nominal;

operating field from 8 to 16 volts.

Test pressure:

390 bar

Inlet pressure:

Minimum 15 bar

Maximum 260 bar

Bursting pressure:

> 400 bar

1st stage adjustment pressure:

4 bar

2nd stage adjustment pressure:

1.5 bar

Safety valve opening pressure:

6.5 bar

Max loss:

< 15 Ncm3/h (aIr)

Indicative service life:

about 100,000 Km

Maximum METHANE flowrate:

18.1 Kg/h

Vehicle maximum power:

up to 100 Kw

Weight:

about 1.6 Kg.

Type approval E13110R 000101

2. FUNCTIONING OF THE PRESSURE

REGULATOR (FIG. 1-2-3)

The methane passes through the pressure regu-

lator inlet (1), passes through the pipe (3) and the

first stage valve(4), and enters the first stage

chamber(3). The pressure exerted by the gas on

the walls of the chamber dilates the first stage

membrane (8), overcoming the resistance of the

calibrated spring (9). Since the membrane (8) is

attached to the lever (6) with fulcrum at (5), it acts

on the first stage valve (4), opening and closing it

to create a pressure balance. From the first stage

chamber (7), the gas passes into the second stage

chamber (11), and its flow rate is regulated by the

pressure exerted by the gas on the membrane

(10), which dilates and overcomes the resistance

of the spring (15) to operate the lever (12) which

adjusts the opening and closing of the first stage

valve (13). Depressurising the engine causes an

axial movement of the third stage membrane (23),

which is connected to the lever (16) and thus

opens the valve (18) allowing the gas to reach the

3rd stage chamber and then, across the spool (2)

through the pipe to the engine.

Functioning

LANDI RENZO S.p.A.

Installationand adjustament manual CN04

7/16

The minimum of the throttle valve (18) is regulated

using the throttle adjusting screw (17), which acts

on the spring (22) and thus on the lever (16) to

ensure passage of the right amount of gas to

operate at idle. The start and acceleration device

consists of a solenoid valve (19) controlled by an

electronic device that only powers the valve when

the engine is started, allowing the gas to exit

through the valve housing (26) and then proceed

to the 3nd stage chamber. If the engine does not

start the coil de-energises, and the core(21) and

spring (20) resume their pressure on the housing

(26), thus cutting off the gas flow; this also applies

if the engine should stall for any reason. Before

starting, when the current is switched on, the

electronic device excites the coil (19) for a pre-set

period of time, freeing the amount of gas needed

for starting from the housing (26).

3. GENERAL WARNINGS

The following instructions should be followed when

installing the pressure regulator:

• install the pressure regulator in the engine com-

partment as close as possible to the point where

the mixer will be installed, attaching it firmly to the

bodywork with the screw on the centre hole (24)

supplied with the unit;

• install the pressure regulator outside the space

housing the organs that take in air to ventilate and

heat the interior compartment;

install the pressure regulator at least 150 mm from

the exhaust manifolds and silencers. If the distan-

ce is less than the minimum value prescribed, but

greater than 75 mm, a diaphragm in sheet metal or

material of equivalent characteristics, with a mini-

mum thickness of 1 mm, must be interposed

between the elements.

• position the pressure regulator parallel to the

direction of movement and in a vertical position, so

that it is easily accessible for adjustment and

maintenance operations;

• check that the pressure regulator is fitted in a

position that is lower than the highest point of the

radiator to avoid the formation of air bubbles in the

water circuit;

• make sure you do not position the pressure

regulator in such a way that the bleed screw is over

the distributor or the ignition coil;

• carefully clean the high pressure methane pipes

before connecting them permanently to the pres-

sure regulator, to avoid getting any impurities

inside the pressure regulator;

• check that there are no leaks from the water pipes

(generally connected to the interior compartment

heating circuit) when the engine is on;

• check that the pressure regulator heats up qui-

ckly through its connection to the engine cooling

circuit.

Each time the engine cooling circuit is emptied the

liquid level must be topped up, ensuring that any

air bubbles that could prevent pressure regulator

heating are eliminated.

The pressure regulator gas outlet must be con-

nected to the mixer, ensuring that the connecting

pipe (which must be as short as possible) has no

curves or bags.

Do not in any circumstances slacken the five

screws (25) that attach the 3rd stage cover to

the pressure regulator body in order to attach

the pressure regulator. Use only the central

hole (24) and the corresponding screw with nut

and washer.

4. ‘ADJUSTMENT OF ‘EC04’ PRESSURE

REGULATORS

with exhaust gas analyser

4.1 Fuel injection vehicles with catalytic con-

verter (V05 system)

The first operation is to adjust the maximum:

• bring the engine to about 3,500 rpm to learn the

default value.

The second operation is to regulate the minimum:

• with the engine on, turn the throttle adjustment

screw(B)(clockwisetodecreaseandanticlockwise

to increase) until the number of steps of the linear

electromechanical actuator shown on the “Di-

splay” menu under MOT on the Mod. V05 Tester

Programmer is equal (or as close as possible) to

the value indicated at DEF.

• Check that the LEDs of the Lambda scale that

indicate carburation are oscillating regularly.

• use the exhaust gas analyzer to check that the

Lambda value is about 1,000, the CO and HC are

close to zero and the CO2 value is around 11-13%.

Refer to the “Lambda Control System A1 V05

installation and adjustment manual’ or the carbu-

ration measurement procedure in the ‘Mod. VO5

Tester Programmer instruction manual” for further

details.

After registering the minimum and the maximum,

perform a road test.

General warnings Regulators setting

LANDI RENZO S.p.A.

Installationand adjustament manual CN04

8/16

4.2 VEHICLE WITH CARBURETTOR OR FUEL

INJECTION ENGINE

The first operation is to adjust the maximum:

• bring the engine to about 3,500 rpm and turn the

throttle adjustment screw on the pipe connecting

the pressure regulator and the mixer, until the

values of CO, CO2 and HC are about as shown in

the table;

The second operation is to regulate the minimum:

• with the engine on, turn the throttle adjustment

screw (B) (clockwise to decrease and anticlockwise

to increase) until the CO, CO2 and HC values are

approximately those shown in the table;

After registering the minimum and the maximum,

perform a road test.

5. ‘ADJUSTMENT OF ‘EC04’ PRESSURE

REGULATORS

without exhaust gas analyser

5.1 VEHICLES WITH FUEL INJECTION

SYSTEMS AND CATALYTIC CONVERTERS

See paragraph 4.1, omitting the test with the

exhaust gas analyser.

5.2 VEHICLES WITH FUEL INJECTION

SYSTEMS AND CARBURETTORS

The first operation is to adjust the maximum:

• bring the engine to about 3,500 rpm and turn the

throttle adjustment screw on the pipe connecting

the pressure regulator and the mixer clockwise

until the engine noise changes because of the lean

mixture, then turn the screw very slowly in an

anticlockwise direction until the engine revs incre-

ase; in this phase the screw does not need to be

turned anticlockwise again since this would only

increase consumption without increasing yield.

The second operation is to regulate the minimum:

• with the engine on, turn the throttle adjustment

screw (B) (clockwise to decrease and anticlockwise

to increase) until a stable minimum is achieved,

and check again after the road test.

After registering the minimum and the maximum,

perform a road test.

6. SYSTEM MAINTENANCE OPERATIONS

To obtain the best from methane fuel, the engine

must be tuned and regularly maintained, in both its

mechanical and its electrical parts. In addition to

the normal maintenance prescribed by the vehicle

manufacturer, you should also:

• every 15,000 km, check/replace the air filter,

replace the spark plugs, check the exhaust gas,

check the efficiency of the electrical system (che-

ck that connections have not rusted);

every 30,000 km, check the play in the valves, the

efficiency of the Lambda probe (for vehicles with

catalytic converters) and use the bleed tap to

check that there is no oil or other residues inside

the pressure regulator.

• every 100,000 km, if malfunctioning has develo-

ped, perform a general overhaul of the conversion

system, using our product overhaul kits, which

come complete the suitable instructions that de-

scribe the procedures to follow. Spark plugs with

a colder thermal grade should be used, checking

that the electrode spacing is never greater than 1

mm. The valve clearances should be increased to

0.05 mm greater than the specifications for petrol

operations supplied by the vehicle manufacturer.

Once a methane conversion system has been

installed, it is natural to use this for as many

kilometres as possible: however, to avoid prejudi-

cing the correct operation of the original petrol

fuelled system, and of the fuel pump, it is advisable

to drive 2/3 km on petrol every 200/300 km at least

(at each refuelling with methane, for example).

Data, descriptions and illustrations are purely indi-

cative, and LANDI RENZO S.p.A. reserves the

right to make improvements or changes to them as

it sees fit, and without notice.

Do not tamper with the original Landi Renzo com-

ponents for any reason, particularly not with the

engine running or with the ignition on.

Washing the engine with direct jets of water, and

installations in unsuitable points of the engine

compartment can cause water infiltration into the

components and in consequence to subsequent

damage.

LANDI RENZO S.p.A. declines any responsibi-

lity for damages to persons or things deriving

from tampering with its device by unauthori-

sed personnel.

Maintenance

SETTING TABLE REGULATORS CN04

LIMITSGAS SPEED

Bottom Top

CO (in %) Idling

3.500 g/m

0.10

0.30

CO2 (in %) Idling

3.500 g/m

HC (in ppm) Idling

3.500 g/m

150

250

Indice

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