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6.0 HELPFUL HINTS
6.1 TROUBLESHOOTING REGULATORS
POSSIBLE CAUSE RECOMMENDED ACTION
A. High Inhalation Effort at Depth:
1. Inlet filter clogged. Replace the filter.
2. No air flowing through the dry air bleed system. Check the flow rate coming out of the
one-way bleed valve . If no or low
air flow is detected, clean the flow
element in the piston, or replace the
piston.
3. High pressure air supply insufficient. Verify the supply air pressure. Make
sure the customer had the tank valve
turned
all the way on.
4. Second stage improperly adjusted. Repeat Steps 1 through 6 in Section
5.4, Set-Up of Second Stage
.
B. Free Flowing:
1. Intermediate pressure too high. Adjust the first stage’s outlet pressure
to below 150 psig. Remove shims .
2. Damaged or worn H.P. piston seat. Replace seat (p/n 3801-5).This also
gives high intermediate pressure.
3. Damaged or worn L.P. poppet stem seat. Replace seat (p/n 978-9BN).
4. Nicked or corroded orifice sealing. Dress the orifices in the first and
second stages with a polishing stick, or
replace the orifices.
5. Demand lever in second stage bent too high. Adjust or replace the lever.
6. Weak spring in second stage. Replace the spring.
7. Second stage improperly adjusted. Repeat Steps 1 through 6 in
Section
5.4, Set-Up of Second Stage
.
8. Parts in the second stage have been severely Allow the second stage to warm up to
chilled due to repeated purging and have shrunk, room temperature (this chilling will not
allowing air to flow. occur in normal diving).
20
15
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