YZ Systems Milton Roy • 201 Ivyland Road • Ivyland, Pennsylvania • USA • 18974 • P: 281.362.6500 • www.yzsystems.com
Page 94
NJEX EUR ver. 08-2021
Section 13: NJEX System Troubleshooting
noid is bad and should be replaced.
e. If the above test indicates the solenoid is
functioning, next determine if the signal is be-
ing sent by the controller, or lost in the cabling
and connections. Open the termination enclo-
sure ,enclosure door just below the N-300,
and connect your volt meter to
TB2
terminals
9
and
10
, with
9
being the positive (yellow
wire) and
10
being the negative (blue wire).
Now, test fire the pump with the test switch.
A momentatry voltage pulse, aproximately
.2 seconds in duration, should be observed.
This will be a DC voltage pulse not exceed-
ing 12VDC. If the pulse is at the termination
panel next check the polarity of connections
of the wiring. The terminal
9
should have a
yellow wire attached and, the terminal
10
should have a blue wire attached. If the
polarity is correct, on the wiring, the cable
assembly to the solenoid should be replaced.
f. If no voltage is detected, contact the technical
service department at the factory.
g. With the actuation gas line reconnected to
the pump, test stroke the pump. Observe if
there is an audible pump stroke with the piston
bottoming out and returning to the top of the
pump housing. If an audible pump actuation is
not present , remove the actuation cylinder and
inspect for a broken return spring, or a stuck /
sticking plunger assembly. Replace the spring
if broken, clean and relubricate the plunger
assembly and actuation cylinder. Make certain
the seals are not sticking to the plunger as-
sembly.
h. Inspect the pump oil level and action during
actuation. The oil level should rise slightly
during an actuation of the pump, and the oil
level must be above the nipple connecting the
reservoir to the pump body. The oil should
not smell strongly of odorant and the oil color
should be red, not clear. If the oil appears
clear and / or smells strongly of odorant, the
pump diaphragm and seals need service.
If the pump is low on oil, or out of oil, fill to
the oil level reference mark inside of the oil
reservoir about half way down with proper oil.
If the pump was completely out of oil, or if
the level was below the top of the nipple, the
pump will need repeated stroking to permit
the trapped air to work out of the oil reservoir.
If possible, let the pump run overnight with
the reservoir cap removed. If refilling with
oil seems to bring the displacement back,
monitor for a while and observe if the oil level
drops again. If the pump continues to use oil,
service the seals and diaphragm servicing.
6. Assure that the pump is properly primed by:
a. Placing the unit in stand by.
b. Closing valve
V8
at the pipeline.
c. Open valve
V3
.
d. Test stroke the pump 15 - 20 strokes with the
Test
key, then place back in standby.
e. Close valve
V3
and open valve
V8
.
f. Place the controller in run mode.
g. Monitor the pump performance and observe if
pump actuation is occurring.
7. If problems persist, contact YZ technical service
for additional assistance.
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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