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10
FIRST-STAGE ADJUSTMENT AND TESTING
F
NOTE: In conjunction with this subsection, the techni-
cian should refer to Table 5 - Test Bench Specifica-
tions, on page 18. In addition, all tests described must
first be done at low-pressure (500 psig) and then again
at service pressure (3000 psig).
1.
With the first stage regulator mounted on the test bench
high-pressure valve block adapter, attach a spare inter-
mediate-pressure hose to the open low-pressure port on
the first-stage regulator. Attach the free end of this hose
to the male fitting provided for it on the test bench. (If
the Octopus regulator is attached to the first-stage regu-
lator, removal of the port plug [Item 20] will be required).
2.
While watching the intermediate-pressure gauge on the
test bench, slowly pressurize the bench and regulator
to 500 psig. The intermediate-pressure gauge should
indicate a "lockup" pressure of 120 to 160 psig. If the
gauge pressure increases beyond 160 psig, turn the air
source off immediately. This indicates a failure of the
first-stage regulator to achieve "lockup" pressure. Refer
to the Troubleshooting Table 1 on page 14 for corrective
guidelines and specific procedures. If the intermediate
pressure is not greater than 160 psig but there is an au-
dible leak or freeflow from the second-stage regulator(s),
adjustment of the lever (Item 34) will be required before
final adjustment of the first-stage intermediate pressure
can be completed. To adjust the lever see
Stage Adjustment and
page
CAUTION: While adjusting the intermediate
pressure, be sure to "cycle" the regulator by
pushing the purge button (Item 2) at least ten
(10) times after turning the adjustment screw
(Item 31). Failure to "cycle" the regulator
can result in a false reading of the first-stage
intermediate-pressure "lock-up".
3.
The optimum lockup pressure is 140±5 psig for the
standard Conshelf 14, and 125±5 psig for the Conshelf
Supreme and 300 Bar DIN versions. To increase the
intermediate pressure, turn the adjustment screw (Item
31) "in" or clockwise; to decrease the intermediate
pressure, turn the adjustment screw "out" or counter-
clockwise. Turn the adjustment screw using a large flat-
bladed screwdriver. Turn the screw no more than ¹⁄₈ turn
at a time, then purge the second stage several times
and observe the adjustment's intermediate-pressure
increase. Repeat this process until the proper interme-
diate pressure is set.
4.
If the acceptable range cannot be achieved by varying
the adjusting screw (Item 11), refer to the Troubleshoot-
ing Table 1 on page 14 for corrective guidelines and
specific procedures.
5.
Assuming the correct intermediate-pressure has been
achieved, depress the purge button (Item 2) several
times, release and observe the test bench intermediate-
pressure gauge 5 seconds to 15 seconds after purging.
The intermediate-pressure indicated must not "creep" or
slowly increase more than 5 psig within this time. If the
intermediate-pressure will not stabilize at one pressure
"Second-
Testing", Step 2a or 2b, on this
setting, refer to the Troubleshooting Table 1on page 14
for corrective guidelines and specific procedures.
6.
After stabilizing the intermediate-pressure repeat Steps
2 through 5 at 3000 psig, service pressure.
For the Conshelf Supreme:
7.
To complete the environmental conversion of a standard
Conshelf 14 or reinstallation of environmental compo-
nents on the Supreme Model, perform the following
procedure while the regulator is pressurized.
CAUTION: Performing this procedure while
the first stage is unpressurized results in in-
correct intermediate pressure and excessive
strain on the secondary diaphragm.
A.
Pour silicone fluid into the spring retainer until the
level reaches within ¹⁄₈-inch below the top of the
retainer.
B.
Insert the secondary diaphragm (Item 33) into the
spring retainer with the outer, raised lip pointing
up. The diaphragm must be covered with silicone
to function properly.
C.
Air bubbles underneath the secondary diaphragm
must be removed by smoothing the diaphragm
with the fingernail.
D.
Using the square, slotted tool provided with the
conversion kit, screw the secondary-diaphragm
retaining ring (Item 34) clockwise into the spring
retainer. Hand-tighten firmly.
E.
Verify that the intermediate-pressure has not
changed after the conversion or reinstallation pro-
cedure. Refer to the subsection on the first-stage
adjustment as required.
When the regulator is depressurized, the secondary dia-
phragm will appear to be "sucked in" (figure 11). When
the regulator is pressurized, the secondary diaphragm
returns to its normal shape (figure 12)
Figure 11
Conshelf XIV Service Manual
Figure 12
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