YZ Systems Milton Roy • 201 Ivyland Road • Ivyland, Pennsylvania • USA • 18974 • P: 281.362.6500 • www.yzsystems.com
Page 72
NJEX EUR ver. 08-2021
Section 12: System Maintenance
Overflow Protector Assembly
Inspection
The overflow protector assembly should be inspected
as follows on each NJEX System in operation,
figure
194
:
1. Isolate the protector by closing valve
V6
located
just below the overflow protector on the expansion
tank.
2. Slowly remove the protector upper housing,
item
A
, by unscrewing it from the protector lower valve
body,
item B
.
3. Inspect the dart and o-ring seal,
item C
, located in
the upper body. It should not be sticky or unusu-
ally shaped. If any distortion to this o-ring is found
it should be replaced immediately. A normal fitting
o-ring will exhibit a slight interference between
the dart and the o-ring when in contact with each
other. This contact is what causes the seal when
necessary.
4.
Inspect the cap to body o-ring,
item D
, and lubri-
cate or replace as necessary.
5. Inspect the reset push button. When pushed
in, the button should depress, then spring back
freely. If any sticking occurs, the o-ring,
item E
,
should be lubricated.
6. To reinstall the protector upper housing, first as-
sure that the dart is fully inserted into the housing
contacting the o-ring seal. Second, install the
upper housing onto the lower body, assuring that
the cap comes to a full seated position against the
protector lower body.
7. Depress the
Reset
button to reset the dart.
8. Slowly open valve
V6
below the protector.
9. The
Reset
button on the side of the overflow
protector is utilized to test the function of the low
pressure relief and to reset the overflow dart.
Pressing this button will over-ride the low pressure
relief and the overflow protection dart.
Figure 194
Valve V6
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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