Landi Renzo CN04 Guide

GB
MANUALE INSTALLAZIONE E REGOLAZIONE PAG. 3
MANUEL AND ADJUSTMENT MANUAL PAGE 9
INSTALLATION AND ADJUSTMENT MANUAL PAGE 6
I
F
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
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Technical Drawings
Schemi Tecnici Schémas Techniques
Esquema Técnicos
Fig. 1 - Ver. CN-04P cod. 536261000 -
Fig. 3
Fig. 2 - Ver. CN-04B cod. 536260000 -
A
B
E
H
C
G
25
D
24 F
I
A
B
F
E
H
C
G
25
D
24
CN-04B
CN-04B
CN-04P
CN-04P

LANDI RENZO S.p.A.
Installationand adjustament manual CN04
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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
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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
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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
0.10
0.30
0.30
CO2 (in %) Idling
3.500 g/m
11
11
13
13
HC (in ppm) Idling
3.500 g/m
150
30
250
60