18
SEa lV2 Technical Maintenance Manual
Filling the SEa with the MRS iii Mobile
Refill Station
The MRS III is a self-contained Mobile Refill Station with an
onboard supply of approved breathing air pressurized up to 4500
psi. The MRS III is designed to fill up to two (2) Aqua Lung SEA
(Survival Egress Air) units simultaneously to the operating pres-
sure of 3000 psi. The following instructions are the same for filling
one unit or two.
1. Verify that both panel mounted fill valves on the MRS III
are closed (clockwise).
2. Open the valves on the MRS III supply cylinders and
verify that the SUPPLY Pressure Gauge on the panel reads
between 3000 and 4500 psi.
3. Verify that the REGULATED Pressure Gauge on the
MRS III panel reads 3000 psi.
4. Remove the fill port plug from the SEA unit and store the
plug in the mounted retainer located on each MRS III. Verify
that the SEA fill port is clean and dry, and place the SEA in
the blast tube.
5. Install the MRS III fill hose connector into the SEA fill port
by rotating the knob clockwise until the o-ring is fully seated.
DO NOT USE A WRENCH OR PLIERS TO TIGHTEN. If the
fitting leaks during filling, the connector threads and o-ring
must be inspected for damage. Replace the damaged parts
as needed.
6. Slowly open the MRS III panel mounted fill valve (coun
-
terclockwise) that corresponds to the fill hose being used.
There is no need to open any valve on the SEA unit.
7. Slowly fill the SEA at a rate not to exceed 500 psi per
minute, to the maximum of 3000 psi.
NOTE
:
If the SeA cylinder becomes excessively
warm to the touch while filling, allow additional filling
time for the unit to cool before removing the SeA unit.
8. When the SEA has cooled and is full, close the MRS III
panel mounted fill valve.
9. Open the bleeder valve knob on the MRS III fill hose con
-
nector and vent the pressure from the fill hose.
10. Verify that the small pressure indicator on the SEA indi-
cates zero pressure.
11. Disconnect the MRS III fill hose connector from the SEA
by rotating the connector knob counterclockwise.
12. Replace the port plug into the fill port of the SEA unit and
hand tighten.
13. When all filling operations are complete, close the valves
on the MRS III supply cylinders. Firmly grasp one of the MRS
III fill hose connectors, point in a safe direction, and bleed
any remaining pressure from the system by slowly opening
the corresponding panel mounted fill valve for that hose.
14. Close both panel mounted fill valves and both bleeder
valve knobs on the MRS III.
15. Attach the fill connectors to the provided mounting brack
-
ets, close and securely latch the MRS III cover.
Second Stage Reassembly
1. Install a new, unlubricated exhaust valve (64) by insert-
ing the stem of the exhaust valve through the center hole of
the exhaust port. Pull the stem all the way through until the
mushroom plug pops through the hole and keeps the valve
securely in place. Examine the flap of the exhaust valve
to make sure it is laying flat and is not distorted or folded
under. Using a pair of small wire cutters, snip the stem of the
exhaust valve so it is only about 1/4" long.
2. Using your fingers, screw the exhaust cover (65) onto the
box bottom (63) until hand tight.
3. Press a new LP seat (51) into the end of the poppet (50)
until it is flush and seated evenly. Ensure the dimpled side is
toward the poppet.
51
50
4. Place the poppet bearing (48), rounded side first, onto the
stem of the poppet (50). Using the poppet as an installation
tool, insert the bearing into the barrel of the valve body (47).
Align the squared side of the poppet bearing with the square
hole in the valve body and press it into place. Remove the
poppet.
48
47
