HEIL PT 1000, Operation Manual

Page: 185 / 202

Issued September 2017
Compressed Natural Gas (CNG) Option Copyright 2017, Heil Environmental
Printed in U.S.A.
177
HEIL CNr
When equipped, the optional Heil CNrG Solenoid System
will monitor and display live in-cab CNG system and tank
Display. Additionally, the system detects and alerts of leaks
(visually and audibly) while closing solenoid valves of
affected tanks to isolate the leak(s).
On the display, tanks are numbered starting with the tank
at the top of the of the CNrG tailgate, "TANK-1", and ending
with the tank lowest in the CNrG tailgate, in the system
shown below, "TANK-7". When the system is operating
without any issues, all boxes are green as shown below.
Figure 88. Main Display Screen
Summary of Features
Display screen inside the cab which gives live
pressure monitoring for each tank and system.
Visual warning in form of messages and color on the
screen along with audible alarm whenever solenoid
failure occurs.
System visual and audible warning if one of the
pressure transducers is unplugged in either ignition
ON or OFF conditions.
Whenever the ignition is OFF and truck is not
running, system gives audible alarm in the event of
any leaks on tank or system side. The operator
needs to turn the ignition ON and check the display
screen that will show the tank location of the leak.
As a safety feature, all solenoids will be closed
whenever there is a leak. A maintenance bypass
code will need to be entered to be able to open
solenoids and drive the vehicle. The leak detection
feature is available only when the ignition is OFF.
Leaks are detected at a pressure difference of 600
psi.