Aqua Lung LPIS User manual

USER'S MANUAL
Rev. 1/16
LOW PRESSURE INFLATION SYSTEM (LPIS)
DRY SUIT INFLATION SYSTEM (DSIS)

2DSIS / LPIS User's Manual
COPYRIGHT NOTICE
This user's manual is copyrighted, all rights reserved. It may not, in whole or
in part, be copied, photocopied, reproduced, translated, or reduced to any
electronic medium or machine readable form with out prior consent in writing
from Aqua Lung America, Inc.
©2016 Aqua Lung International
DSIS / LPIS User’s Manual PN 108609
You can contact a Technical Adviser via e-mail at:
[email protected]
[email protected]
[email protected]
TRADEMARK NOTICE
Aqua Lung®is a registered trademark of
Aqua Lung America, Inc.
Warnings, Cautions and Notes:
Pay special attention to information provided in Warnings, Cautions
and Notes that are accompanied by one of these symbols:
A NOTE is used to emphasize important points, tips and reminders.
A WARNING indicates a procedure or situation that, if not avoided,
could result in serious injury or death to the user.
A CAUTION indicates any situation or technique that could
cause damage to the product and could subsequently result in
injury to the user.

3
General Precautions and Warnings ............................................................ 4
Product Description...................................................................................... 6
Preparation and Setup.................................................................................. 7
General Filling Procedures .......................................................................... 7
Filling Methods for DSIS / LPIS ................................................................... 9
Pre-Dive Inspection .................................................................................... 19
Post-Dive Inspection .................................................................................. 21
Care and Maintenance................................................................................ 21
Inspection and Service............................................................................... 23
Warranty Information ................................................................................. 23
Technical Specications ............................................................................ 24
DSIS / LPIS Parts......................................................................................... 25
Notes ............................................................................................................ 26
TABLE OF CONTENTS

4DSIS / LPIS User's Manual
WARNING: The DSIS / LPIS is intended to be a supplemental air supply
for inatable devices only. DO NOT attempt to use the system as a
breathable air supply. Attempts to use the DSIS / LPIS for this purpose
could result in serious injury or death.
WARNING: Visual inspection and factory prescribed service for the DSIS
/ LPIS must be performed annually by a factory trained and qualied
service technician. Repair, service and visual inspection must not be
attempted by untrained or unqualied personnel.
WARNING: DO NOT attempt to overll the DSIS / LPIS beyond 3000 PSI
(207 BAR) at 70ºF/ 21ºC. Doing so may seriously weaken the cylinder
and cause it to rupture, resulting in serious injury or death.
WARNING: The DSIS / LPIS is designated compatible for use only with
normal, atmospheric, compressed air (21% oxygen and 79% nitrogen by
volume). DO NOT attempt to ll with other gases, including pure oxygen or
air which has been enriched with oxygen exceeding 21% in content. Failure
to observe this warning may result in serious injury or death due to re
and explosion or the serious deterioration and failure of the equipment.
WARNING: DO NOT ll or use the DSIS / LPIS if it has been exposed to
extreme heat exceeding 250º F / 121º C or open ame. Instead, discharge
the cylinder completely and return it to a qualied technician for visual
inspection and possible hydrostatic testing.
GENERAL PRECAUTIONS AND WARNINGS
WARNING: DO NOT apply any type of petroleum-based lubricant, such
as household oil or motor oil to any part of the DSIS / LPIS. The DSIS
/ LPIS does not require any lubrication under normal circumstances,
except that which is performed during inspection and service by a
factory trained service technician.
WARNING: DO NOT apply any type of aerosol spray to the DSIS / LPIS.
Doing so may cause permanent damage to certain plastic components.
WARNING: Before using the DSIS / LPIS, you must have successfully
received training and certication in the technique of SCUBA diving from
a Military or government operated diving school (or any recognized cer-
tication agency). Use of SCUBA equipment by uncertied or untrained
persons is dangerous and can result in serious injury or death.

5
WARNING: Before using the DSIS / LPIS, it is important to receive in-water
training which simulates proper use of this system. You must also understand
the basic principles and techniques of buoyancy control both on the surface
and underwater. Use of the DSIS / LPIS without proper training is dangerous
and can result in serious injury or death.
WARNING: During training exercises, it is important to ensure that the
DSIS /LPIS is always pressurized whenever it is submerged in order to
prevent the entrance of water into the system. Whenever the system
has been completely emptied of air underwater, it is important to return
the DSIS /LPIS as soon as possible to a qualied technician for visual
inspection and any necessary service before attempting to rell it.
WARNING: It is important to ll the DSIS / LPIS only with dry, ltered air
with a water vapor content that does not exceed -65°F / -53ºC dew point.
Excess water vapor in the air can cause ice to form inside the DSIS / LPIS
and interfere with the operation of the system at colder temperatures.
NOTE: 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 SEA 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 SEA is in the“OFF” position.
NOTE: When instructed to unscrew or loosen a part, turn the part
counter-clockwise.
When instructed to screw, or tighten a part, turn the part clockwise until
hand tight. DO NOT use any tools to install components.
WARNING: When diving in cold water (below 50˚F or 10˚C), you must
have received training and certification in the techniques of cold water
diving from a recognized training agency.
NOTE: When instructed to depressurize the system, close the handwheel, and
connect the MP hose to an ination device. Depress the inator button on the
device for 5 seconds and release for 5 seconds. Repeat this procedure until the
system is depressurized. Remove MP hose from ination device when done.

6DSIS / LPIS User's Manual
PRODUCT DESCRIPTION
• DSIS / LPIS piston rst stage with integral ll port, dial pressure gauge,
safety plug assembly and on / off knob. Black coated brass components
are utilized on rst stage for a low reective signature.
• Swivel relief plug will vent air from rst stage at 175 - 210 PSI (12-14.5 BAR).
• 6 in (15.4 cm), 9 in (22.8 cm), 20 in (50.8 cm) or 33 in (83.8 cm) quick
disconnect medium pressure (MP) inator hose with 360 degree swivel.
• Light weight aluminum cylinder 1.5 ft³ (42 L), 3.0 ft³ (85 L) or 6.0 ft³ (170 L)
3000 PSI (207 BAR).
• MOLLE pocket for 3.0 ft³ (85 L) LPIS System PN 769146 (optional).
DSIS / LPIS Components (Fig. 1)
Figure 1
Swivel Relief Plug
Aluminum
Cylinder
Dial Pressure
Gauge
Safety Plug Assy
Fill Port
Medium Pressure
(MP) Inator Hose
360º Swivel
First Stage
On / Off Knob
Component Identication
MOLLE Pocket

7
The purpose of this manual is to familiarize you with the correct setup, lling,
inspection and maintenance of the DSIS / LPIS.
The DSIS / LPIS is packaged fully assembled and ready to use after it has
been lled with air. Before using it, however, it is very important to carefully
read and understand the procedures outlined in this manual for lling the unit
and performing a pre-dive inspection.
PREPARATION AND SETUP
GENERAL FILLING PROCEDURES
1. Before attempting to ll the DSIS / LPIS, ensure that the ll adapter and rst
stage are completely dry – especially in the area surrounding the ll port.
2. The DSIS / LPIS is congured with a 3000 PSI (207 BAR) aluminum cylinder.
Examine the cylinder markings to verify it is rated for a ll pressure of 3000 PSI
(207 BAR), has a current visual inspection and a current hydrostatic test date
(if required) (Fig. 2).
Figure 2
Month & Year
of Manufacture
(Hydro Date)
Maximum Fill
Pressure
NOTE: The DSIS / LPIS 1.5 ft³ (42 L) aluminum cylinder does not
require hydrostatic re-testing. The 3.0 ft³ (85 L) and 6.0 ft³ (170 L)
aluminum cylinders do require hydrostatic re-testing. (Fig. 2).

8DSIS / LPIS User's Manual
WARNING: DO NOT attempt to ll the DSIS / LPIS if the cylinder
markings indicate that it is assembled with a non standard cylinder
rated for a different ll pressure than 3000 PSI (207 BAR). Doing so
may result in rupture or explosion in the event of re or overlling.
Instead, immediately return the unit to a qualied technician and
do not use under any circumstances.
Figure 4
4. Unscrew the ll port cap from the
ll port (Fig. 4).
5. Closely inspect the ll port opening
to ensure that no debris, residue or
moisture is present.
CAUTION: If moisture is found to be present inside the ll port
opening, this indicates that water may have entered the rst stage
and cylinder. DO NOT ll or attempt to use the DSIS / LPIS until
it has received complete inspection and any required service by
a qualied technician.
Figure 3
3. Close the handwheel and depressurize
the system (Fig. 3).
Red Indicator
Ring Visible
"OFF"
POSITION

9
WARNING: DO NOT attempt to loosen or remove any components
on the rst stage or hose assembly under any circumstances. Doing
so could result in a dangerous malfunction of the DSIS / LPIS which
could result in serious injury or death.
FILLING METHODS FOR DSIS / LPIS
Filling DSIS / LPIS with a SCUBA Fill Adapter
NOTE: The DSIS / LPIS system does not include a SCUBA ll adapter.
This adapter (PN 108325) may be purchased separately (Fig. 5).
Figure 5
1. Supply (SCUBA) cylinder with SCUBA ll adapter (PN 108325).
2. Compressor with compressor ll adapter (PN 100656).
3. Compressor with HP ll adapter (PN 102865).
O-Ring

10 DSIS / LPIS User's Manual
1. Using a calibrated pressure gauge, check the supply cylinder to ensure that
it contains 3000 PSI (207 BAR). It is very important to ensure that the DSIS /
LPIS is lled to its total capacity but not overlled.
WARNING: DO NOT attempt to use the SCUBA ll adapter or ll
the DSIS / LPIS from an airsource with a ll pressure greater
than 3000 PSI (207 BAR). Doing so could cause a dangerous
malfunction to the ll adapter or weaken the cylinder and safety
plug, resulting in serious injury or death.
3. Screw the threaded male tting on
the ll adapter into the ll port. DO
NOT apply a wrench or otherwise
over-tighten the ll adapter (Fig. 6).
4. Loosen the ll adapter yoke screw
as needed so that the dust cap can be
removed from the inlet tting.
5. Inspect the supply cylinder o-ring
to make sure it is present, in good
condition and seated evenly in the
supply cylinder valve.
2. Remove the protector cap from the threaded male tting of the ll adapter.
Inspect the ll adapter to ensure that the o-ring is present and seated evenly at
the base of the threads. Check the threads of the male tting, making sure they
are clean and not damaged.
Figure 6
CAUTION: The dial pressure gauge is for reference only. Use the
ll system gauge to indicate accurate cylinder pressure.
CAUTION: Do not attempt to ll the DSIS / LPIS directly from a
supply cylinder unless you have received the necessary training
and authorization to do so. If done incorrectly, this procedure
poses certain hazards which may cause severe injury or death.

11
6. While supporting the DSIS / LPIS
with one hand, place the yoke of the
ll adapter over the cylinder valve to
align the inlet tting ush against the
valve o-ring. Screw the ll adapter
yoke screw into the small dimple on
the backside of the cylinder valve until
nger tight (Fig. 7).
Figure 7
Bleed Valve Screw
NOTE: The DSIS / LPIS will ll with the handwheel in the “OFF”
position (red indicator ring visible). In this position the pressure
gauge will not register PSI. This is not recommended.
Figure 8
8. While holding the rst stage and ll
adapter secure, open the handwheel
to pressurize the system (Fig. 8).
7. Close the bleed valve screw on
the ll adapter (Fig. 7).
"ON"
POSITION
Red Indicator
Ring Not Visible
NOTE: Always ll the cylinder as slowly as possible (do not exceed
500 PSI / 34.5 BAR per minute) by turning the handwheel of the
supply valve slowly to control the rate of ll. Rapid lling will generate
heat and will result in an incomplete ll after the cylinder cools. If the
cylinder is warm to the touch afterward, the ll rate was too rapid.

12 DSIS / LPIS User's Manual
9. While supporting the cylinder with one hand, very slowly open the handwheel
on the supply cylinder to begin lling (do not exceed a ll rate of 500 PSI / 34.5
BAR per minute). Make sure the dial pressure gauge shows that the cylinder
is lling properly.
10. When at least three minutes have elapsed and air can no longer be heard
owing from the supply cylinder into the DSIS / LPIS, completely open the supply
cylinder valve. Verify the cylinder has been lled to 3000 PSI (34.5 BAR).
11. While holding the rst stage and ll adapter secure, close the handwheel on
the supply cylinder. Close the handwheel on the DSIS / LPIS.
12. Open the bleed valve screw on the ll adapter to relieve the line pressure.
13. While supporting the DSIS / LPIS cylinder with one hand, loosen the yoke
screw on the ll adapter until the complete system can be lifted off and removed
from the supply cylinder valve.
14. Unscrew the ll adapter from the rst stage. Replace the dust cap over the
inlet tting and tighten the yoke screw nger tight. Replace protector cap on the
threaded male tting of the ll adapter.
15. Thread the ll port cap into the ll port until nger tight and depressurize
the system.
16. When charging is complete, store the ll adapter in a clean area.

13
Filling DSIS / LPIS with a Compressor Fill Adapter
NOTE: The DSIS / LPIS system does not include a compressor ll
adapter. This adapter (PN 100656) may be purchased separately (Fig. 9).
O-Ring
O-Ring
Figure 9
WARNING: DO NOT attempt to use the compressor ll adapter or
ll the DSIS / LPIS from an airsource with a ll pressure greater
than 3000 PSI (207 BAR). Doing so could cause a dangerous
malfunction to the ll adapter or weaken the cylinder and safety
plug, resulting in serious injury or death.
CAUTION: Do not attempt to fill the DSIS / LPIS directly from
a compressed air filling station unless you have received
the necessary training and authorization to do so. If done
incorrectly, this procedure poses certain hazards which may
cause severe injury or death.
CAUTION: The dial pressure gauge is for reference only. Use the
ll system gauge to indicate accurate cylinder pressure.

14 DSIS / LPIS User's Manual
1. Remove the protector cap from the threaded male tting of the ll adapter. Inspect
the ll adapter to ensure that the o-ring is present, not damaged and seated evenly
at the base of the threads. Check the threads of the male tting, making sure they
are clean and not damaged. Inspect the o-ring in the groove on the ll block end
of the adapter, making sure it is present, not damaged and seated evenly.
2. Screw the threaded male tting on the ll adapter into the ll port of the rst stage
until nger tight. DO NOT apply a wrench or otherwise over-tighten the ll adapter.
3. Loosen the yoke screw on the compressor ll yoke as needed so that the
yoke can be placed over the block of the ll adapter.
4. While supporting the DSIS / LPIS
with one hand, place the yoke over
the block of the ll adapter to align the
inlet tting ush against the ll block
o-ring. Screw the yoke screw into the
small dimple on the backside of the ll
adapter block until nger tight (Fig. 10).
5. Close the bleed valve screw on the
compressor ll yoke (Fig. 10).
NOTE: The DSIS / LPIS will ll with the valve handwheel in the “OFF”
position (red indicator ring visible). In this position the pressure
gauge will not register PSI. This is not recommended.
Figure 10
6. While holding the rst stage and ll
adapter secure, open the handwheel
to pressurize the system (Fig. 11).
Figure 11
"ON"
POSITION
Red Indicator
Ring Not Visible
Bleed Valve Screw

15
NOTE: Always ll the cylinder as slowly as possible (do not exceed
500 PSI / 34.5 BAR per minute) by turning the handwheel of the
supply valve slowly to control the rate of ll. Rapid lling will generate
heat and will result in an incomplete ll after the cylinder cools. If the
cylinder is warm to the touch afterward, the ll rate was too rapid.
7. While supporting the cylinder with one hand, very slowly open the compressor
valve to begin lling (do not exceed a ll rate of 500 PSI / 34.5 BAR per minute).
Make sure the dial pressure gauge shows that the cylinder is lling properly.
8. When at least three minutes have elapsed and air can no longer be heard
owing from the compressor ll hose into the DSIS / LPIS, completely open the
compressor valve. Verify the cylinder has been lled to 3000 PSI (34.5 BAR).
9. While holding the rst stage and ll adapter secure, close the handwheel on
the compressor valve. Close handwheel on the DSIS / LPIS.
10. Open the bleed valve screw on the compressor ll yoke to relieve the
line pressure.
11. While holding the DSIS / LPIS cylinder, loosen the yoke screw on the
compressor ll yoke as needed and remove it from the ll adapter. Return the
compressor ll yoke to its storage location.
12. Unscrew the ll adapter from the rst stage. Replace protector cap on the
threaded male tting of the ll adapter.
13. Thread the ll port cap back into the ll port until nger tight and depressurize
the system.
14. When charging is complete, store the ll adapter in a clean area.

16 DSIS / LPIS User's Manual
NOTE: The DSIS / LPIS system does not include a HP ll adapter.
This adapter (PN 102865) may be purchased separately (Fig. 12).
O-Ring
Figure 12
Filling DSIS / LPIS with a HP Fill Adapter
CAUTION: Do not attempt to fill the DSIS / LPIS directly from
a compressed air filling station unless you have received
the necessary training and authorization to do so. If done
incorrectly, this procedure poses certain hazards which may
cause severe injury or death.
CAUTION: The dial pressure gauge is for reference only. Use the
ll system gauge to indicate accurate cylinder pressure.
WARNING: DO NOT attempt to use the compressor ll adapter or
ll the DSIS / LPIS from an airsource with a ll pressure greater
than 3000 PSI (207 BAR). Doing so could cause a dangerous
malfunction to the ll adapter or weaken the cylinder and safety
plug, resulting in serious injury or death.

17
1. Remove the protector cap from the threaded male tting on the ll adapter.
Inspect the ll adapter to ensure that the o-ring is present, not damaged and seated
evenly at the base of the threads. Check the threads of the male tting, making
sure they are clean and not damaged.
Bleed Valve
Screw
Adapter
Nut
Figure 13
3. Close the bleed valve screw on
the ll adapter (Fig. 13).
2. Insert the threaded male fitting
on the ll adapter into the ll port on
the rst stage. Screw the adapter nut
into the ll port until nger tight. DO
NOT apply a wrench or otherwise
over-tighten the ll adapter. (Fig. 13).
NOTE: The DSIS / LPIS will ll with the valve handwheel in the “OFF”
position (red indicator ring visible). In this position the pressure
gauge will not register PSI. This is not recommended.
4. While holding the rst stage and ll
adapter secure, open the handwheel
to pressurize the system (Fig. 14).
Figure 14
"ON"
POSITION
Red Indicator
Ring Not Visible

18 DSIS / LPIS User's Manual
5. While supporting the cylinder with one hand, very slowly open the
compressor valve to begin filling (do not exceed a fill rate of 500 PSI /
34.5 BAR per minute). Make sure the dial pressure gauge shows that the
cylinder is filling properly.
6. When at least three minutes have elapsed and air can no longer be heard
owing from the compressor ll hose into the DSIS / LPIS, completely open the
compressor valve. Verify the cylinder has been lled to 3000 PSI (34.5 BAR).
7. While holding the rst stage and ll adapter secure, close the handwheel on
the compressor valve. Close the handwheel on the DSIS / LPIS.
8. Open the bleed valve screw on the ll adapter to relieve the line pressure.
9. Unscrew the adapter nut and remove it from the rst stage. Replace protector
cap on the threaded male tting of the ll adapter.
10. Thread the ll port cap back into the ll port until nger tight and depressurize
the system.
11. Return the ll adapter to its storage location.
NOTE: Always ll the cylinder as slowly as possible (do not exceed
500 PSI / 34.5 BAR per minute) by turning the handwheel of the
supply valve slowly to control the rate of ll. Rapid lling will generate
heat and will result in an incomplete ll after the cylinder cools. If the
cylinder is warm to the touch afterward, the ll rate was too rapid.

19
PRE-DIVE INSPECTION
Before each use, the DSIS / LPIS must be given a thorough visual inspection
and functional test by a qualied technician. NEVER use a DSIS / LPIS which
shows signs of damage, leakage or substandard performance.
1. Carefully inspect the medium pressure hose to ensure it is securely connected
into its respective port on the rst stage. Inspect the length of the hose to ensure
that it is not blistered, cut or otherwise damaged. Inspect the hose ttings for any
signs of corrosion.
2. Visually inspect the entire system for any external damage, such as dents,
gouges, cracks or severe external corrosion.
3. Ensure the handwheel is closed and
the system is depressurized. Inspect the
pressure gauge, checking that it is securely
fastened to the rst stage. Closely examine
the pressure gauge to ensure that it reads
“0 PSI (Fig. 16).
Figure 16
“0 PSI”
CAUTION: The pressure gauge should read “0 PSI” when the
handwheel is closed and the system is depressurized. DO NOT
attempt to use the DSIS / LPIS if the gauge indicates pressure until
it has received inspection and service from a qualied technician.
CAUTION: DO NOT attempt to pressurize the DSIS / LPIS without
rst checking to ensure that the MP hose and pressure gauge are
securely fastened to the rst stage.

20 DSIS / LPIS User's Manual
5. Closely examine the pressure
gauge to make sure it reads “3000
PSI”, indicating a full cylinder (Fig. 18).
Provided that these pre-dive inspection requirements have all been met, the
DSIS / LPIS is now ready for use.
CAUTION: Do not deplete the DSIS / LPIS of air during the pre-
dive inspection. Doing so will drop the pressure below the “3000
PSI” and it will have to be topped off by maintenance personnel.
4. Connect the DSIS / LPIS MP inator
hose onto the QD tting of the ination
device being used. Open the handwheel
to pressurize the system (Fig. 17).
6. Briey depress the inator button to ensure that sufcient airow is provided
to the MP hose. Immediately after releasing the inator button, listen closely to
ensure that the MP hose does not continue to allow any air ow.
"ON"
POSITION
Red Indicator
Ring Not Visible
Figure 17
Figure 18
3000 PSI