Aqua Lung DSIS, Technical Manual

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4
LPIS / DSIS Technical Manual
Pinch Method
Press upwards on sides of o-ring to
create a protrusion. Grab o-ring or
insert o-ring tool at protrusion.
Introduction
This manual provides factory prescribed procedures for the
correct service and repair of the Aqua Lung product described
in this manual. It is not intended to be used as an instructional
manual for untrained personnel.
The procedures outlined within this manual are to be performed
only by personnel who have received Factory Authorized training
through an Aqua Lung Service & Repair Seminar. If you do not
completely understand all of the procedures outlined in this manual,
contact Aqua Lung® to speak directly with a Technical Adviser
before proceeding any further.
Scheduled Service
This product should be given the same care and maintenance
as life support equipment. It is therefore important to perform
scheduled overhaul service for the complete unit, according to
the procedures outlined in this manual on a regularly scheduled
basis; annually with normal use. Overhaul service may need
to be performed more frequently depending on the amount of
use it received and environmental condition in which it is used.
General Guidelines
1. In order to correctly perform the procedures outlined in
this manual, it is important to follow each step exactly in the
order given. Read over the entire manual to become familiar
with all procedures before attempting to disassemble the
product in this manual and to learn which specialty tools and
replacement parts will be required. Keep the manual open
beside you for reference while performing each procedure.
Do not rely on memory.
2
. All service and repair should be carried out in a work area
specifically set up and equipped for the task. Adequate lighting,
cleanliness and easy access to all required tools are essential
for an efficient repair facility.
3. As each unit is disassembled, reusable components should
be segregated and not allowed to intermix with nonreusable
parts or parts from other units. Delicate parts, including inlet
fittings and crowns which contain critical seating surfaces,
must be protected and isolated from other parts to prevent
damage during the cleaning procedure.
4. Use only genuine Aqua Lung® parts provided in the
overhaul parts kit for this product. DO NOT attempt to
substitute an Aqua Lung® part with another manufacturer’s
regardless of any similarity in shape or size.
5. Do not attempt to reuse mandatory replacement parts under
any circumstances, regardless of the amount of use the product
has received since it was manufactured or last serviced.
6. When reassembling, it is important to follow every torque
specification prescribed in this manual, using a calibrated
torque wrench. Most parts are made of either marine brass or
plastic and can be permanently damaged by excessive stress.
General Conventions
Unless otherwise instructed, the following terminology and
techniques are assumed:
1. When instructed to remove , unscrew , or loosen a
threaded part, turn the part counter-clockwise.
When instructed to
install
,
screw,
or
tighten
a threaded part,
turn the part clockwise.
2. When instructed to “OPEN” the handwheel, turn the
handwheel counter-clockwise. The red indicator ring will
not be visible
in the handwheel window, this indicates the
unit is in the “ON” position.
When instructed to “CLOSE” the handwheel, turn the
handwheel clockwise. The red indicator ring will be
visible
in the handwheel window, this indicates the unit
is in the “OFF” position.
3. When instructed to depressurize the system, close
the handwheel and connect the MP hose to an inflation
device. Depress the inflator button on the device for 5
seconds and release for 5 seconds. Repeat this procedure
until the system is depressurized. Remove MP hose from
inflation device when done.
4.
When instructed to fill or refill the cylinder, 3000 PSI
(207 BAR) will be the standard fill pressure used for testing
purposes in this manual. Upon completion of all testing, fill
the cylinder to its full capacity as marked. ( Reference the
Filling Procedures section of the User’s Manual).
5.
The following acronyms are used throughout this manual:
MP is
Medium Pressure;
HP
is High Pressure:
LP
is Low
Pressure.
6.
Numbers in parentheses reference the key numbers on the
exploded view parts schematics. For example , in the state-
ment, “...remove the o-ring (7) from the crown (8)...”, the num-
ber 7 is the key number to the crown o-ring.
7. When instructed to remove an o-ring, use the pinch method
(see illustration below) if possible, or use a brass or plastic
o-ring removal tool. Avoid using hardened steel picks, as they
may damage the o-ring sealing surface. All o-rings that are
removed are discarded and replaced with brand new o-rings.