12
Cousteau/ SEA First Stage Service & Repair Manual
© 2000 Aqua Lung America, Inc.
Final Adjustment and Testing Procedures
1.
Connect the intermediate pressure test gauge either to a
quick-disconnect inflator hose, or to the female fitting of a
second stage LP hose, depending on the connection of the test
gauge. Check to ensure there are no open ports.
CAUTION: Before testing intermediate pressure, it is impor-
tant to connect the first stage to a fully assembled and
properly adjusted second stage. This will provide a safety
relief valve if the intermediate pressure exceeds 155-170 psi.
If a properly adjusted second stage is not available, be sure
to open the bleed valve of the test gauge before pressurizing.
Failure to relieve intermediate pressure in excess of 400 psi
may result in damage to the test gauge or LP hose.
2.
Check to ensure that the first stage adjustment screw(31) is
correctly set to its preliminary adjustment; flush with the top
of the standard spring retainer(28), or flush with the shoulder
inside the environmental spring retainer(32).
3.
Connect the first stage to a filtered air source of 500 psi, and
slowly pressurize the first stage. While closely monitoring
the IP test gauge to ensure that the intermediate pressure does
not rise above 120 psi, slowly turn the knob of the bleed valve
clockwise until it is completely shut.
CAUTION: If a second stage is not connected to the first
stage and the intermediate pressure rises above 200 psi,
immediately reopen the bleed valve of the test gauge and
shut off the air supply. Refer directly to Table 1 - Trouble-
shooting, and remedy as needed before proceeding further.
4.
When the intermediate pressure has stabilized below 120 psi,
apply a 8mm hex key to turn the adjustment screw clockwise
in small increments of adjustment. While turning the adjust-
ment screw, it is important to simultaneously purge the sec-
ond stage or briefly turn the test gauge bleed valve open and
shut. Monitor the test gauge while adjusting in this manner
until the intermediate pressure locks up between 115-120 psi.
CAUTION: Failure to cycle the regulator during adjustment
can result in a false reading of the intermediate-pressure.
5.
When the intermediate pressure has been determined to be
stable at 120 psi or less, increase the inlet pressure to between
2,500 – 3,000 psi while checking the IP test gauge once again
to ensure that the intermediate pressure does not rise above
135 psi. If the intermediate pressure rises above 135 psi,
immediately purge the second stage, or re-open the bleed
valve of the test gauge, and shut off the air supply. Refer
directly to Table 1 - Troubleshooting, and remedy as needed.
