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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. Removing some 1st
stage shims .
2. Damaged or worn H.P. piston seat. Replace 1st stage seat (p/n 3801-5).
This also gives high intermediate
pressure..
3. Damaged or worn L.P. poppet stem seat. Replace 2nd stage 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 back
chilled due to repeated purging and have shrunk, up to room temperature. If the
allowing air to flow. regulator is to be used for Ice diving,
set the second stage up after cooling it
in Ice water. This will help prevent this
type of leakage from occuring due to
cold water conditions.
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