Technical Specification - LANDI RENZO TN SIC Guía Instalación Y Regulación

Legend
Specification
Thank you for purchasing a LANDI RENZO
pressure regulator type 'TN SIC', the reliable and
technologically advanced device to install a CNG
conversion system on vehicles with catalytic
converter, injection system, carburettor and turbo-
charger
Correctly installed, your pressure regulator will give
many years of excellent performance.
To ensure that you achieve peak performance from
the conversion system, please read this installation
and setting guide thoroughly.
LEGEND (Fig. 1)
A) Gas outlet connector;
B) Idle speed pipe (the pipe is not installed on the
regulator, but is supplied separately. We suggest its
use only in case of stalling during idle / out-of-idle
condition. If used, to position always at the same
direction of gas outlet connector);
C) Sensitivity screw;
D) Plus contact for idle speed solenoid valve;
E) Idle speed setting screw;
F) High pressure solenoid valve (not present on
the TN1 SIC and TN1 SIC Turbo-Charged
versions)

1. TECHNICAL SPECIFICATION

Electronic control device to reduce the natural gas
pressure allowing a regular flow of gas every time
the engine requires it.
It is equipped with three natural gas reduction stages
that allow stability at both high and low pressures
and a high-pressure solenoid valve upstream from
the first stage. The absorption of heat, taken from
parts of the reduction unit, heated with the liquid of
the engine cooling circuit, prevents the natural gas
freezing during the fall in pressure phase.
The flow of gas necessary for engine idling has a
positive pressure from the second stage and is
activated by means of a gas pipe separated from the
main flow. It includes an electronic starting device
with a built-in safety system that trips and shuts off
the gas solenoid valves if the engine is switched off
or even stalls.
SPECIFICATION:
Regulator type: 3 stages with electronic starting
device and idling at positive pressure
'TN SIC' CNG REGULATORS INSTALLATION AND ADJUSTMENT MANUAL
Operation
Use: motor transport (suitable for vehicles with
catalytic converter, injection, carburettor and turbo-
charger)
Type of fluid: CNG (compressed natural gas)
Body: GDALSI 13 Fe UNI 5079
Heating: engine cooling circuit liquid
Test pressure: 300 bar
Inlet pressure: 220 bar
First stage adjustment pressure: 3.5-4 bar
Second stage adjustment pressure: 1,5 bar
Power supply: 12V DC
H. P. solenoid valve coil power capacity: 20W
Idling solenoid valve coil power capacity: 18W
VERSIONS:
TN1 SIC (standard): up to 130 HP
TN1 B SIC (standard): up to 130 HP
TN1 B SIC (oversize): from 130 HP to 190 HP
TN1 C SIC (oversize): from 130 HP to 190 HP
TN2 C SIC (super overs.): from 190 HP to 220 HP
TN2 C/S: from 220 HP to 250 HP
TN3 SIC: over 250 HP
TN1 SIC Turbo-Charged: for turbo-charged
engines up to 200 HP
2. REGULATOR OPERATION (Fig. 2)
When solenoid valve (1) is open, natural gas enters
the first-stage chamber (4). The pressure exerted by
the gas on the chamber walls dilates diaphragm (8)
thus over-coming the resistance of spring (9). Being
connected to lever (3), diaphragm (8) also acts on
the first-stage valve (2) generating a pressure
balance. The gas then passes from the first-stage
chamber (4) to the second-stage chamber (11). Gas
flow is metered by the pressure exerted by
diaphragm (10) in controlling the opening and
closing of valve (13).
The vacuum generated by the engine causes the
third-stage diaphragm (6) to move axially. Being
connected to lever (5), this diaphragm causes valve
(7) to open so that the gas reaches the engine
through outlet (19). Valve (7) is sealed when spring
(14) is adequately set.
The starting and idle-speed device consists of
solenoid valve (17) which is controlled via an
electronic device. Plunger (15) moves thus leaving
hole (18) open. The gas coming from the second-
stage chamber (11) flows out of this hole thus
allowing the engine to run at idle speed. If the engine
stops, the coil becomes de-energised and
LANDI RENZO S.p.A.
7 / 20