HEIL PT 1000, Operation Manual

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Issued September 2017
Compressed Natural Gas (CNG) Option Copyright 2017, Heil Environmental
Printed in U.S.A.
186
HEIL CNr
(CONTINUED)
System Under Voltage
The display notification shown in the figure below will only
be displayed in the event that the System Voltage is less
than 8 volts, indicating that there is voltage too low to safely
operate the Cortex Controller and Display.
Figure 105. Display Screenshot:
System Under Voltage
Solenoid Failure
Perform this procedure for any tank solenoid in the Heil
not needed for a system without solenoids. Refer to
Solenoid Failure Detection to help determine which
solenoid has failed.
A. Preparation for Defueling
Follow the instructions below and then use one of the
methods described in
CNG Fuel Module Defueling
Methods . Ignition will have to be left ON to defuel all
tanks with functioning solenoids.
1. Remove the relevant side access cover to access
the 1/4 turn valve of the tank on which the solenoid
has failed. This valve is the long-handled valve
located next to the manual shut-off valve.
2. Open the 1/4 turn valve for only the tank on which the
solenoid has failed. Now, that tank will be connected
to the main supply line and the gas will have a
pathway to defuel even if the solenoid failed to open.
3. Now you can defuel by using one of the methods
described in CNG Fuel Module Defueling Methods
.
4. Make sure that the display in the cab shows that all
tanks and the system are completely depressurized
before disconnecting any lines/fittings.
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