LANDI RENZO TN SIC Guía Instalación Y Regulación página 9

Regulators setting
4.2 INJECTION CAR
The first step is to adjust peak speed:
• take the engine at about 3,500 r.p.m. and turn the
peak speed regulator located on the start petrol
solenoid valve to take the values of CO, HC and CO
as shown in the table.
The second step is to adjust idling speed:
• with the engine running, turn the Idle speed setting
screw (E) (clockwise it decreases, anticlockwise it
increases) to take the values of CO, HC and CO
shown in the table.
Having regulated idling and peak speeds, carry out a
test on the road.
4.3 CARBURETTED CAR
The first step is to adjust peak speed:
• take the engine to approximately 3,500 r.p.m. and
turn the peak speed regulator located between the
regulator and the mixer to take the values of CO, HC
and CO as shown in the table.
2
The second step is to adjust idling speed:
• with the engine running, turn the Idle speed setting
screw (E) (clockwise it decreases, anticlockwise it
increases) to take the values of CO, HC and CO
shown in the table.
Having regulated idling and peak speeds, carry out a
test on the road.
SETTING TABLE REGULATORS 'TN SIC'
GAS SPEED
CO (in %) idling
3.500 g/m
CO (in %) idling
2
3.500 g/m
HC (in ppm) idling
3.500 g/m
'TN SIC' CNG REGULATORS INSTALLATION AND ADJUSTMENT MANUAL
2
as
2
as
2
LIMITS
bottom top
0.10 0.30
0.10 0.30
11 13
11 13
150 250
30 60
LANDI RENZO S.p.A.
9 / 20
Sensitivity setting
5. SETTING PROCEDURE FOR REGULATORS
TYPE 'TN SIC'
without exhaust gas analyser (Fig. 1)
5.1 CATALYSED CAR
See point 4.1 without gas analyser check.
5.2 INJECTION AND CARBURETTED CAR
The first step is to adjust peak speed:
• take the engine to approximately 3,500 r.p.m. and
turn the peak speed regulator located between the
regulator and the mixer clockwise until you notice a
fall in engine speed due to the mixture getting leaner;
then turn this same screw very slowly anticlockwise
until there is an increase
in engine speed; at this stage it is not necessary to
turn the screw further anticlockwise since there
would only be greater consumption and no increase
in efficiency.
The second step is to adjust idling speed:
• with the engine running, turn the Idle speed setting
screw (E) (clockwise it decreases, anticlockwise it
increases) until an optimum idling speed is obtained
which is also to be checked after the road test.
Having regulated idling and peak speeds, carry out a
test on the road.
6. SENSITIVITY SETTING PROCEDURE FOR
REGULATORS TYPE 'TN SIC' (Fig. 1)
The regulators are already set in-house by the
manufacturer. If problems arise, such as idle speed
instability or acceleration gap, please check the
degree of regulator sensitivity.
The setting screw (C) is not used for setting idle
speed but simply to adjust the regulator sensitivity.
By unscrewing it you reduce the spring load on the
3rd stage lever while by tightening it you increase the
spring load on the 2nd stage lever towards closing.
In particular, since the idle speed flow is separated
from the peak speed one, shifting from idle to peak
speed should take place without 'carburation gaps';
such gaps may occur, above all, during too slow
accelerations (too tightened screw); at the same time
the regulator should remain tight without any gas
leakage every time the engine is turned off (too loose
screw).