Compac CNG User Manual

Troubleshooting
Problems Filling a Vehicle
Compac Industries Ltd.
Page 77
www.compacngv.com
Problems Filling a Vehicle
Problem
Likely Cause(s)
Recommended Action
The dispenser is under filling
the vehicle
The medium or high bank solenoid is
not opening.
 See Solenoid Problem Troubleshooting
section
The storage pressure in the cascades
service station pressure banks is
lower than 200 bar, causing the
dispenser to receive less gas than it
should.
 This is not a dispenser fault.
The filters are blocked.
 Remove and replace the coalescing filters.
Water in the gas mains has caused
freezing, blocking the pipes.
 Pour hot water on the frozen part of the
dispenser.
 Install a drier into the gas main.
Fast fill or temperature compensation
variables are incorrectly set
 Check pressure transducers are calibrated
and all parameters are correct
 Replace transducers if they cannot be
calibrated
The regulator pressure is set too low.
 Adjust the regulator set pressure Check the
Setting and Sealing of the Regulator (see
page 43)
The dispenser stops filling the
vehicle after approximately 1kg
of gas has been dispensed
The over pressure switch is faulty
 Check the End of sale indicator to confirm
there is a problem with the over pressure
switch.
 Check the wiring to the switch and switch
operation. Replace switch if no fault is found
in the wiring.
The over pressure switch link has
come loose in J12
 Check the End of sale indicator to confirm
there is a problem with the over pressure
switch.
 Check the link in J12 is still in place and the
contacts are clean.
The dispenser is over filling the
vehicle
The regulator pressure is set too
high.
 Adjust the Regulator set pressure Check the
Setting and Sealing of the Regulator (see
page 43)
The regulator seal is worn out.
 Clean the regulator and replace the valve
seals (see page 52).
Fast fill or temperature compensation
variables are incorrectly set
 Check pressure transducers are calibrated
and all parameters are correct
 Replace transducers if they cannot be
calibrated
The dispenser is slow filling the
vehicle.
Moisture in the gas mains has caused
freezing in one or more of the valves.
(This often occurs when water has
not been cleared out of the gas pipes
after testing.)
 Pour boiling water onto the pipework where
the freezing has occurred until the ice has
thawed and the gas can flow.
 Contact your gas supplier
The preset display is flashing
after a fill.
The solenoid has not closed and the
preset amount has been exceeded.
The preset display will
stop flashing when the next fill is
started.
 See Solenoid Problem Troubleshooting
section
Gas flows but does not read up
on the display.
The C4000 needs to be reset
 Re-power dispenser.
Solenoid valves are not closing at the
end of a fill when the dispenser stops
metering because of dirt and/or water
contamination.
 Clean the solenoid and replace the valve
seals.
The meter is faulty and has stopped
 Replace the meter (see page 65).

Compac CNG Specifications

General

Brand	Compac
Model	CNG
Category	Dispenser
Language	English