Problems Filling - Compac CNG Installation And Service Manual

Troubleshooting

Problems Filling

Problem
The post is under filling
The loading post stops filling
the vehicle after approximately
1kg of gas has been dispensed
The loading post is slow filling
Gas flows but does not read up
on the display.
The loading post stops at
9999.99 99999.9
, , or
999999
units according to
where the decimal point is set.
Compac Industries Ltd.
Likely Cause(s)
Water in the gas mains has caused
freezing, blocking the pipes.
The over pressure switch is faulty
The over pressure switch link has
come loose in J12
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.)
The C4000 needs to be reset
Solenoid valves are not closing at the
end of a fill when the loading post
stops metering because of dirt and/or
water contamination.
The meter is faulty and has stopped
recording flow.
The loading post will stop dispensing
if either the value or the quantity
displays ever reach these values.
Page 47
Recommended Action
 Pour hot water on the frozen part of the
loading post.
 Install a drier into the gas main.

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.
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.
 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
 Re-power loading post.
 Clean the solenoid and replace the valve
seals.
 Replace the meter (see page 38).
 Hang up the nozzle to reset the display and
restart.
This is not a loading post fault.
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Problems Filling