HEIL PT 1000, Operation Manual

Page: 187 / 202

Issued September 2017
Compressed Natural Gas (CNG) Option Copyright 2017, Heil Environmental
Printed in U.S.A.
179
HEIL CNr
(CONTINUED)
The Alarm Summary Screen can be reached by pressing
the right arrow on the display twice.
Figure 91. Path to Alarm Summary Screen
Figure 92. Alarm Summary
Screen
Solenoid System Function
The valve body on each CNG tank has an integrated
solenoid. The solenoids are normally closed when the
ignition is OFF and open when ignition is ON and a voltage
is supplied to them.
Leak Detection/Solenoid Lock
The system is capable of detecting a leak in the system or
leak in any tank when the ignition is initially OFF and the
leak starts. For safety purposes, if a leak is detected, all
solenoids are locked in the closed position and not allowed
to open until a maintenance code is entered and bypass is
activated. The audible alarm activates whenever there is
pressure difference detected of 600 psi or more and the
truck ignition is OFF (ignition must be turned ON to see
more details about the leak on the display screen).
NOTICE
Authorized Service Personnel should contact Heil
Technical Service for the maintenance code to unlock the
CNG solenoids.