HEIL PT 1000, Operation Manual

Page: 190 / 202

Issued September 2017
Compressed Natural Gas (CNG) Option Copyright 2017, Heil Environmental
Printed in U.S.A.
182
HEIL CNr
(CONTINUED)
Maintenance Bypass
The following are the steps must be followed by a qualified
maintenance technician after getting any display messages
described in this manual. This will allow a qualified service
person to get the truck back on route/correct the issue:
1. Driver will need to call maintenance department of
their company in order to drive/move the truck since
all solenoids are locked and need maintenance
bypass for them to open.
2. For any leaking tank, open the oblong access covers
on the street side of the CNrG tailgate and then close
that tank's manual shut off valve. In case of system
leak, solenoids will not open until the leak is stopped
(system leak is a leak detected in the line going from
FMM to tanks on high pressure side).
3. Go inside the cab and on display screen hold "ok"
button on screen until it prompts you to enter
maintenance code.
4. Enter the maintenance bypass code and you will see
the screen shown in the figure to the right.
NOTICE
Authorized Service Personnel should contact Heil
Technical Service for the maintenance bypass code to
unlock the CNG solenoids.
Figure 98. Display Screenshot:
Maintenance Screen
5. Make sure you have first closed the manual shut off
valves on the tanks that are leaking (Step 2). You will
notice that the Bypass Mode is OFF by default. Press
"ok" button and turn ON Bypass Mode. Once you do
this, all solenoids (except leaking tank/tanks) open.
However, all tanks are now connected to each other
and to the main supply/return line. This is the reason
it is very important to first perform Step 2 before
performing this step.
6. You will now be able to drive the truck to your
maintenance department to evaluate and repair the
leak. The audible alarm will not go OFF until the
issue is corrected.