Introduction - Aqua Lung SEA LV2 Technical Manual

4

Introduction

This manual provides factory prescribed procedures for
the correct service and repair of this Aqua Lung product.
It is not intended to be used as an instructional manual for
untrained personnel. The procedures outlined in 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 Advisor 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; once every two years with normal use.
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 non-reusable
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 over-
haul 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 aluminum, 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. The method used to depressurize your system will depend
on its configuration:
• SEA w/ handwheel: Depress second stage purge button for
5 seconds and release for 5 seconds. Repeat this procedure
until the system is depressurize.
• SEA w/o handwheel: Breathe the unit down by taking 5
breaths from the second stage and pause for 5 seconds.
Repeat this procedure until the system is depressurized.
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 the manual:
LP is Low Pressure; MP is Medium Pressure; and HP is
High Pressure.
6. Numbers in parentheses reference the key numbers on the
exploded parts schematics. For example, in the statement,
"... remove the o-ring (7) from the crown (8) "...the number 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) or use a brass or plastic
o-ring removal tool. Avoid using hardened steel picks
(unless directed), as they may damage the o-ring sealing
surface. All o-rings that are removed are discarded and
replaced with brand new o-rings.
Pinch Method
Press upwards on sides of o-ring to
create a protrusion. Grab o-ring or
insert o-ring tool at protrusion.
SEA MK / LV2 Technical Manual