YZ Systems Milton Roy • 201 Ivyland Road • Ivyland, Pennsylvania • USA • 18974 • P: 281.362.6500 • www.yzsystems.com
Page 93
NJEX EUR ver. 08-2021
Section 13: NJEX System Troubleshooting
tion. If not, remove the actuation cylinder. Inspect for
a broken return spring, or a stuck / sticking actuator
piston or plunger. Replace the spring if broken. Clean
and Lubricate the actuation cylinder and actuation
piston assembly. Manually push the plunger into the
seal assembly and ensure it returns completely and
freely. If sticking continues to occur, the seals should
be replaced. Reassemble and see if alarm reoccurs
after a system restart.
5. If pump actuation is normal:
a. Inspect the discharge lines and valves for a
restriction.
b. Inspect all the check valves on the discharge
side of the pump, from the NJEX System to
the pipeline, for proper operation.
c. A back pressure regulating device must be
installed immediately outside the NJEX enclo-
sure on the odorant line leading to the pipe-
line injection point. Perform a forward purge
noting the time required to empty the Verom-
eter. If the time to empty the Verometer is
longer than 30-45 seconds, after the level
begins dropping, replace the Verometer filter,
and restart the system. During the system
restart monitor the controller and observe if
the alarm reoccurs.
d. Replace the inlet check valve to the pump.
6. If problems persist, contact YZ technical service
for additional assistance.
Pump Failure Alarm
Troubleshooting Steps
When an active
Pump Failure
alarm is indicated the
following steps should be taken:
1. Verify that the Verometer has odorant in it, and
that the expansion tank has the proper pressure
in it of
1.72 Bar
.
Note:
If the Verometer is empty, restart the system.
Stroke to the pump to cyle odorant through the system
and observe if the alarm reoccurs.
2. Verify that the pump volume spacer matches the
pump displacement parameter in the controller.
3. Verify that all valves and check valves are proper-
ly set system operation. Inspect for valve settings
that can restrict pump displacement.
4. Check the actuation gas filter for flow resriction or
closure.
5. Ascertain whether the pump is properly stroking.
a. If pump actuation does not occur as the Test
key is pressed, remove the actuation gas
line at the top of the pump and test the pump
stroke again. As the
Test
key is pressed,
there should be a burst of gas at the open ac-
tuation supply connection. If gas is released
from the open actuation supply line skip to
subsection
5.g
. , otherwise continue to
5.b
.
b. If gas is not blown from the loose connection,
disconnect the hose leading from the pump
solenoid to air relay valve. Test stroke the
pump again and observe if gas is discharged
from the small hose.
c. If gas comes out of the solenoid briefly when
the
Test
key is pressed the solenoid is good
but, the air relay valve requires service or
repair.
d. If small hose does not release gas, remove
the pump solenoid wiring cable, the solenoid
located on the right of the two solenoids.
Next, connect a volt meter to the two paral-
lel posts of the solenoid cable. As the
Test
key is pressed, obseve if a 12VDC current
becomes present.
If a voltage is detected the solenoid should
be replaced.
If a volt meter is unavailable, the fill valve
signal may be used to test the solenoid.
First, test the fill valve function to verify that
it is working properly before using it to test
the pump solenoid. Second, verify that the
Verometer is less than 100 % full on the level
indication. Thrid, take the cable connected to
the fill valve solenoid, remove it and re-con-
nect it to the pump solenoid. With the status
key in the run mode instruct the NJEX System
to fill. If the solenoid is good, you should get
gas from the solenoid. To stop it, place in the
NJEX System in standby mode and gas flow
should stop. If no gas flows the pump sole-
Summary of Contents for NJEX 6300G
Page 1: ...NJEX 6300G 7300G N A T U R A L G A S O D O R I Z A T I O N S Y S T E M...
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Page 3: ...NJEX 6300G 7300G Instruction Operating Manual Version 08 2021...
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