Amron AMCOMMAND Il User manual

Instruction Manual
For
Amron International Diving Supply, Inc.
Model 8225-HP & 8225-HP2 AMCOMMAND Il
Two Diver Air Control Systems
S/N______________________
This manual and the information contained herein is provided for use as an operation and
maintenance guide. No license or rights to manufacture, reproduce, or sell either the manual or
articles described herein are given. Amron International Diving Supply, Inc. reserves the right to
change specifications without notice.
Amron International Diving Supply, Inc.
1380 Aspen Way
Vista, California 92081 U.S.A.
Phone [phone] ¥Fax [phone]
Email: [email protected]
Website: www.amronintl.com
Copyright © 2005, Amron International, Inc.
Revised December 2011

TABLE OF CONTENTS
SECTION
Specifications 1
Air Control.....................................................................................................................1.1
Depth Monitoring...........................................................................................................1.2
Communications ...........................................................................................................1.3
Enclosure......................................................................................................................1.4
General Information 2
Description....................................................................................................................2.1
Air Control.....................................................................................................................2.2
Depth Monitoring...........................................................................................................2.3
Low Pressure Alarm Module.........................................................................................2.4
Communications ...........................................................................................................2.5
Diving Safety and Regulations 3
Diving Safety & Regulations..........................................................................................3.1
Personnel Requirements...............................................................................................3.2
Air Supply Requirements ..............................................................................................3.3
Calibration, Service and Inspection...............................................................................3.4
Options 4
Warranty and Service Policy 5
Limited Warranty...........................................................................................................5.1
Service Policy................................................................................................................5.2
Controls and Connections 6
General .........................................................................................................................6.1
Air Control.....................................................................................................................6.2
Drawing, Air Control Front Panel Model 8225-HP ........................................................6.3
Depth Monitoring (Pneumo)..........................................................................................6.4
Low Pressure Alarm......................................................................................................6.5
Drawing, Pneumo Front Panel Model 8225-HP............................................................6.6
Communications ...........................................................................................................6.7
Drawing, Communicator Front Panel Model 2825A-8225.............................................6.8
I

TABLE OF CONTENTS
SECTION
Pre-Dive Procedures 7
Pre-Dive Set-Up ...........................................................................................................7.1
Pre-Dive Check-Out......................................................................................................7.2
Pre-Dive Pneumo Test..................................................................................................7.3
Pre-Dive Communications Test ....................................................................................7.4
Connecting Diver Umbilical...........................................................................................7.5
Low Pressure Supply....................................................................................................7.6
Operating Procedures 8
Low Pressure Breathing Air ..........................................................................................8.1
High Pressure Breathing Air..........................................................................................8.2
Pre-Operation Check List..............................................................................................8.3
Pneumo Readings.........................................................................................................8.4
Diver Communications..................................................................................................8.5
2-Wire Operation...........................................................................................................8.6
Diagram, Set-Up Instructions (Figure 3) .......................................................................8.7
Simulcom (4-Wire) Operation........................................................................................8.8
Diagram, Simulcom 4-Wire Connection, Model 2825-8225 (Figure 4) .........................8.9
Simulcom - What, Why and How? ..............................................................................8.10
What is Simulcom? .....................................................................................................8.11
To Operate and/or Check-Out Simulcom....................................................................8.12
Theory of Operation 9
Mechanical....................................................................................................................9.1
Flow Diagram, (8225-HP) Air Control ...........................................................................9.2
Electrical........................................................................................................................9.3
Functional Block Diagram (2825-8225).........................................................................9.4
Maintenance 10
Review of Scheduled Maintenance.............................................................................10.1
Scheduled Maintenance..............................................................................................10.2
Trouble Shooting & Repair 11
General Information ....................................................................................................11.1
Air Control...................................................................................................................11.2
Depth Monitoring.........................................................................................................11.3
Diver Communications................................................................................................11.4
Problems and Probable Causes .................................................................................11.5
II

TABLE OF CONTENTS
III
SECTION
Reference Material 12
Dive Log, U.S. Navy (Chart)........................................................................................12.1
Repetitive Dive Worksheet..........................................................................................12.2
No Decompression Limits...........................................................................................12.3
Gauge Pressure for Depth of Seawater & Fresh Water..............................................12.4
Equivalent Depths of Seawater & Fresh Water...........................................................12.5
Drawings 13
Schematic Diagram-Model 2825A-8225.....................................................................13.1
Parts Identifier, 2832-202............................................................................................13.2
Schematic Diagram- 28FDW OPTION........................................................................13.3
Schematic and Parts Locator-Model 2324-202...........................................................13.4
Parts Locator- Pneumo Front Panel 8225-200 ...........................................................13.5
Parts Locator - Pneumo Back Panel 8225-200...........................................................13.6
Parts Locator - Air Control Front Panel 8225-400HP..................................................13.7
Parts Locator - Air Control Back Panel 8225-400HP..................................................13.8
Parts Locator - Air Control Front Panel 8225-400HP2................................................13.9
Parts Locator - Air Control Back Panel 8225-400HP2..............................................13.10
Parts Locator - Diver Communications 2825A-8225-28FDW ...................................13.11
Parts Locator - Regulator 8000-0201........................................................................13.12
Parts List 14
Amcomand II Air Control System, Model 8225-HP.....................................................14.1
Amcomand II Air control System, Model 8225-HP2....................................................14.2
8225-200 Pneumo Panel Assembly............................................................................14.3
8225-300 Case Assembly...........................................................................................14.4
8225-400HP Air Control Panel Assembly, Model 8225-HP........................................14.5
8225-400HP2 Air Control Panel Assembly, Model 8225-HP......................................14.6
8225-500 Yoke/Hose Assembly..................................................................................14.7
8000-0201 Regulator, Pressure Reducing..................................................................14.8
2825A-8225-400M Front panel Assembly...................................................................14.9
2405-28 Microphone, Push to Talk...........................................................................14.10
2823-602 External Charger Assembly......................................................................14.11
Recommended Spare Parts......................................................................................14.12
Repair & Calibration Log 15
Repair and Maintenance Log......................................................................................15.1
Gauge Calibration Log................................................................................................15.2

SPECIFICATIONS
AIR CONTROL 1.1
High Pressure Input
Input Pressure Range.............. 500-3000 PSI with standard CGA850 Yoke Connections
***500-4500 PSI with optional 300 Bar DIN Adapters
Inlet Valve (Source Select)...............................................................................................2
Gauge - 0-5000 PSI............................................................................. Accuracy +/- 1.5%
Check Valve, prevents reverse inlet flow.........................................................................2
Input Filter, In Line Pre Regulator......................................................................50 Micron
CGA850 Yoke connections with 6ft. High-pressure hose whips (standard).....................2
***Available with optional 300 Bar DIN Adapters, Amron Part No. SAA5300
High Pressure Regulator, Tescom
Outlet Pressure Range.......................................................................................0-265 PSI
High Flow.............................................................................................................Cv = .24
Max Pressure......................................................................................................4500 PSI
Low Pressure Input, with Check Valve
Max Pressure........................................................................................................285 PSI
Inlet Connection (#6 JIC) .................................................................................................1
Diver Outlet Connection, (O2 Fitting)...............................................................................2
Diver Outlet Valve............................................................................................................2
Air Pressure Gauge, 0-400 PSI ........................................................... Accuracy +/- 1.5%
Over Pressure Relief Valve Set Pressure.............................................................285 PSI
Universal Storage Block - CGA850 Yoke & 300 Bar DIN
HP hoses and CGA850 yokes or optional 300 BAR DIN connections are secured to
universal storage blocks mounted on air control panel located inside of unit.
Panel
Material ......................................................................................................Stainless Steel
Powder Coating......................................................Black Textured Semi-Gloss Polyester
Silkscreen Graphics ............................................................................Red, White & Blue
1

SPECIFICATIONS
2
DEPTH MONITORING (PNEUMO) 1.2
Pneumo Gauge, 3D Precision
Mirrored Scale, 6 Inch......................................................................................................2
Range .........................................................................Dual Scale 0-250 FSW/0-76 MSW
Divisions.................................................................................................................. 1 Foot
Accuracy .............................................................................................0.25% of Full Scale
Pneumo Valve
Regulating Valve, KEL-F Seat .........................................................................................2
Outlet Connection
O2 Fitting Chrome Plated Brass ......................................................................................2
Low Pressure Alarm
Audio Range, 22.5-125 PSI .......................................................... Factory Set at 100 PSI
Panel Material
Material ..............................................................................................................Aluminum
Powder Coating......................................................Black Textured Semi-Gloss Polyester
Silkscreen Graphics ...............................................................................................Yellow
COMMUNICATIONS 1.3
AMCOM II, Model 2825A-8225 2-Diver Communicator
Operating Voltage................................................................................................12 V DC
Power .............................................................................................Rechargeable Battery
or External Power..................................................................................................12 VDC
Operating Time ......................................................................................Nominal 60 Hour
Charger ........................................................................................................ 110/220 Volt
Frequency Response ...................................................................................300-7500 Hz
Audio Power..........................................................................................................12 Watt
Panel................Black Powder Coat over Stainless Steel with White Silkscreen Graphics
ENCLOSURE 1.4
Case Material
Pressure molded fiberglass, with aluminum and or stainless steel hardware. Includes
carrying handle, latches, and stay hinge to lock unit in open position (upper section is
locked upright in respect to lower section).
Case
Lid closed....................................................................................... 20" W x 14" D x 12" H
Lid Open......................................................................................... 20" W x 14" D x 21" H
Weight: ...........................................................................................Approximately 70 lbs.
Color: ..................................................................................................International yellow

GENERAL INFORMATION
DESCRIPTION 2.1
The AMRON AMCOMMAND II Model 8225-HP & 8225-HP2 is a portable self contained two diver
high and low pressure air control, communication and depth monitoring (pneumo) system, for
surface supplied diving operations. The system is designed to provide a central control point for the
supply of breathing air to the divers, monitor the diver’s depth, and provide two way communications
between the divers and the surface. The system is a housed in a durable pressure fused fiberglass
case, which provides a convenient, compact, rugged, professional system.
AIR CONTROL 2.2
The Air Control Section consists of two high pressure inputs, a single low pressure input, and two
diver air connections.
Standard 3000 PSI MAX Input
Model 8225-HP & HP2 comes standard with 2 each CGA850 yokes attached to 6-foot long
HP hoses. The CGA850 yoke limits the maximum input pressure to 3000 PSI.
Optional 4500 PSI MAX Input
Installing the 300 Bar DIN Adapters, Amron Part No. SAA5300, will increase the maximum
input pressure limit to 4500 PSI. Simply remove CGA850 yoke nut and yoke from bleeder
body, screw on 300 Bar DIN adapters, and tighten with a wrench.
Each input has a shut off valve and 0-5000 psi gauge.
Check valves provide protection against back flow of air from a full bottle to an empty, when
switching HP bottles. High-pressure air is reduced to desired low pressure via a Tescom adjustable
regulator. The input to the regulator is protected against contamination by a 50-micron filter.
Regulator output pressure is adjustable over the range of 0 to 285 psi; a 2 1/2" 0-400 PSI gauge
monitors the output pressure. The unit has an over pressurization relief valve, factory set to 285 psi.
The low-pressure input is #6 JIC (3/8), and has a check valve to permit simple switch over from low-
pressure air to high-pressure air.
Divers air line connection is O2type fitting; control is via two 1/4 turn ball valves permitting
unrestricted flow.
DEPTH MONITORING 2.3
The diver’s pneumo connection is O2type fitting, pneumo valves are regulating type. Pneumo
gauges are, 6" high precision 0.25% of full-scale accuracy, dual scale 0-250 FSW/0-76 MSW with 1
foot increments. Gauge protectors are provided for each pneumo gauge.
3

GENERAL INFORMATION
4
LOW PRESSURE ALARM MODULE 2.4
Low Pressure Alarm Module supplies a loud audio signal to alert the operator when a diver's air
pressure falls below a preset limit of 100 PSIG.
COMMUNICATIONS 2.5
The diver communication system is based on the field proven AMRON Model 2825. The unit is
powered from internal rechargeable gel cell batteries, battery charger provided. Operating time from
fully charged battery is approximately 60 hours. Unit can also be operated from an external 12 V DC
source, via charger jacks on the front panel. The communicator has a unique battery condition
indicator; Steady GREEN light indicates battery voltage level is good. Blinking GREEN light
indicates battery voltage is approaching a low level (approx 2-4 hours of operation remain). Steady
RED light indicates battery voltage is below the level necessary to guaranty proper operation.
WARNING: When Battery Condition indicator is steady RED light, communication will stop. The
battery condition indicator also functions in the same manner when operating from an external power
source.
Possibly the most useful feature of the AMCOMMAND communicator is the ability to operate the unit
remotely. This feature allows the use of a hand held push to talk microphone (included), or a walk
and talk type module (optional). This allows the tender (operator) to move about and still maintain
contact with the divers.
The use of the noise canceling push to talk microphone automatically disconnects the speaker when
talking to the divers cutting out the majority of the background noise, greatly improving the
intelligibility of communications.
The communicator provides 12 watts voice power. This power level provides the volume necessary
to communicate clearly even under difficult conditions. Standard controls include; power on/off,
tender volume, diver volume, speaker on/off, 5-way binding post diver input, push to talk switch,
headset/microphone jack, and remote push to talk jacks.
28/FDW Wireless Tender Option
Models 8225-HP/28/FDW & 8225-HP2/28/FDW Amcommand II comes with the Amron 2 Diver
Deluxe Communications System with Wireless Tender. This feature allows the tender (operator) to
be completely mobile around the dive sight while still remaining in constant contact with the divers.
The wireless tender is a full duplex (SIMULCOM) system. The system comes complete with a
built-in transceiver module with antenna and one wireless headset with clip-on belt module. The
system allows unlimited headsets for listen only. The unit operates FM at 49 MHz. The range is up
to 1/4 mile and uses one 9 volt battery.

SAFETY & REGULATIONS
DIVING SAFETY & REGULATIONS 3.1
Safe Diving does not happen by accident. There are few occupations in the world, which require such a
broad range of knowledge and training as diving. There are many diverse factors, which can affect
diving safety i.e., planning, weather, equipment, location, water conditions, as well as the type of work
being done. The single most important factor in eliminating accidents is planning and attention to detail.
Diving knowledge, training and experience are fundamental elements needed to execute a safe dive.
The following reference materials are recommended as sources of information for running a safe
diving operation:
1. U.S. Department of Labor, OSHA Regulations 1910.401 Sub-part T–Commercial
Diving Operations.
2. U.S. Navy Diving Manual.
3. Divers Handbook of Underwater Calculations.
Diving regulations
Several codes and regulations cover diving operations and procedures. In the United States most
commercial diving operations are covered by the OSHA (Occupational Safety and Health Administration)
regulations, or Individual State regulations, which are adopted from the federal regulations, and made a
part of the civil code.
While government agencies are exempt from OSHA regulations, they generally fall under other
regulations, which are similar or stricter than OSHA. If they are completely exempt, they must still abide
by the procedures for operating a safe dive.
While no agency (within the U.S., for commercial diving operations) tests or approves equipment for use,
they do establish minimum standards, which should be followed. The suitability of a given piece of
equipment for a particular task is left to the supervisor of the dive. The following information is extracted
from the OSHA regulations for commercial diving operations.
NOTE: The information is not presented as a direct or complete quotation, but rather as our
interpretation of the regulations. Each diving supervisor should obtain a copy of these regulations for
their own use.
Copies of the complete section of Commercial Diving Operations are available from Amron International
for a nominal charge.
WARNING: DO NOT USE THE AMCOMMAND II FOR THE FOLLOWING
1. Mixed gas diving operations with an oxygen level greater than 40%.
2. Oxygen or oxygen enriched breathing mixtures above 40%.
The AMCOMMAND II is not designed or intended for these applications.
5

SAFETY & REGULATIONS
PERSONNEL REQUIREMENTS 3.2
1. Each dive team member shall have the experience or training necessary to perform assigned
tasks in a safe and healthful manner. The person operating the AMCOMMAND II must be
trained in the proper operating procedures, and emergency operating procedures.
2. It is the responsibility of the designated person in charge of the diving operation to be on-site
at all times. He is responsible for all aspects of the diving operation affecting the safety and
health of dive team members.
3. The dive shall be terminated when:
1. A diver requests termination.
2. A diver fails to respond to instructions.
3. Diver communications are lost and can not be re-established quickly.
4. A diver begins to use diver carried back-up breathing air, or location reserve breathing air.
5. Operational conditions deteriorate to a point where safe diving can not be guaranteed.
AIR SUPPLY REQUIREMENTS 3.3
WARNING
Regardless of the type of air supply being used for surface supplied diving; the diver must always have a
back-up supply of air. Generally this is in the form of a bailout bottle. The back-up air supply must be
adequate to return the diver to the surface, if the dive requires in-water decompression this must be
accounted for also.
1. The diver's air supply may originate from a low-pressure air compressor, high-pressure air cylinders,
or a combination of both. Regardless of the source, the air must meet certain established standards
of purity and must be supplied in an adequate volume for breathing.
2. The air supply requirements depend upon the specific factors of each dive such as depth, duration,
level of exertion, and type of diving system (helmet/hat) being used. It is the dive supervisor's
responsibility to ensure that an adequate supply of air is available and on site for the planned dive.
This includes sufficient back-up air to safely return the diver to the surface in the event the primary
supply of air is lost.
3. Low-pressure compressors used for breathing air should be specifically designed for diving.
Compressors used to supply air to the divers shall be equipped with a volume tank which has a
check valve on the inlet side, a pressure gauge, relief valve, drain valve, and a proper filtration
system. The output of the air compressor system shall be tested for air purity every 6 months by
means of an air sample.
4. Air compressor intakes shall be located away from and up-wind of, areas containing exhaust or other
contaminants.
5. NOTE: OSHA Regulations require a decompression chamber capable of recompressing the diver
at the surface to a minimum of 165 FSW (6 ATA) shall be available at the dive location for a
surface-supplied air diving to depths deeper than 100 FSW.
6

SAFETY & REGULATIONS
7
CALIBRATION, SERVICE AND INSPECTION 3.4
1. Each depth gauge shall be dead weight tested or calibrated against a master reference gauge every
6 months, or if there is a discrepancy greater than two percent (2%) between any two equivalent
gauges.
2. Each equipment modification, repair, test, calibration, or maintenance service shall be recorded by
means of a tagging or logging system, and include the date and nature of work performed, and the
name of the person performing the work. For your convenience a repair service log is provided at
the end of this manual.
3. Equipment Inspection; Prior to each dive, the equipment shall be inspected and checked to ensure
that it is in proper working order.

OPTIONS
OPTIONS 4.1
Model 2821-28 Walk-and-Push-to-Talk (2-Wire Operation)
AMRON headset extension (remote walk and talk), with push-to-talk belt module, jacks for headset,
25 feet 1/4" O.D. cable. (Use with Model 2460-28 headset with boom microphone).
Model 2822-28 Remote Walk-and-Talk (4-Wire Operation)
AMRON headset extension (remote walk and talk), with belt module, jacks for headset, 25 feet 1/4"
O.D. cable. (Use with Model 2460-28 headset with boom microphone).
Model 2460-28 Headset
Headset with boom microphone and color-coded dual banana plugs to mate to color-coded inputs on
Amron communicators and accessory items.
Model 2829-01 Wireless Kit with Case
Wireless kit comes standard with a remote tender transceiver, wireless headset, wall charger, and
case.
Model 2829-04 Wireless Headset
Wireless Headset with single ear muff and boom microphone. Full Duplex, includes voice-actuated
transmitter.
Model 2405-28 Hand Held Microphone
Noise Canceling Hand Held Push to Talk Microphone.
Model SAA5300 300 Bar DIN Adapter
Converts a standard Amron CGA850 Yoke (3000 PSI) to 300 Bar DIN (4500 PSI) use.
8

WARRANTY
LIMITED WARRANTY 5.1
AMRON INTERNATIONAL DIVING SUPPLY, INC. warrants that its products are free from defects
in material and workmanship under normal use and service, as described in AMRON
INTERNATIONAL DIVING SUPPLY, INC. literature covering this product, for a period of 90 days
from date of shipment. Amron's obligation under this warranty is limited to the repair of or
replacement, at Amron's option, of defective material. This warranty shall not cover defects, which
are the result of misuse, negligence, accident, repair or alterations.
SERVICE POLICY 5.2
AMRON INTERNATIONAL encourages owners of equipment to call [phone] for assistance
if problems are encountered. Every effort will be made to assist in solving your problem.
Equipment which must be returned to the factory for repairs should be safely packaged, insured,
and shipped prepaid to: Amron International, Inc.
1380 Aspen Way
Vista, Ca. 92081
Be sure to include the following information:
Your Name
Your Company
Shipping address
Phone Number
Contact Name
A short description of the problem is most helpful.
Valid in-warranty repairs will be made at no charge. Out-of-warranty repairs will be handled in the
same fashion, except you will be advised of the repair charges before any work is done.
9

CONTROLS & CONNECTIONS
10
GENERAL 6.1
Before using the AMCOMMAND II Model 8225-HP or 8225-HP2, familiarize yourself with its operating
controls and connections. For simplicity, the controls and connections are divided into three categories.
The categories are Air Control, Pneumo, and Communications.
AIR CONTROL 6.2
The Air Control Section consists of a high-pressure section and a low-pressure section. The system is
designed to supply breathing air to a diver through an umbilical. This is known as surface supplied
diving. The air the divers are breathing is supplied from the surface.
A. High Pressure
Accepts breathing air from SCUBA bottles, or any other suitable source, i.e. high-pressure flasks. The
pressure is reduced to a level suitable to the needs of the diver via a pressure-reducing regulator. The
pressure required by the diver is determined by the type of helmet/hat being used and the depth the
diver is working at. The general rule of thumb is bottom pressure plus over-bottom pressure required for
a given type of diving hat/helmet. Consult your diving hat/helmet manufacture/manual for the requirement
of the hat/helmet you are using.
The High Pressure Section has two inputs, complete with high-pressure hose whips, CGA850 SCUBA
bottles yokes, and pressure reducing regulator.
Standard 3000 PSI MAX Input
All models comes standard with 2 each Amron CGA850 yokes attached to 6-foot long HP hoses.
The CGA850 yoke limits the maximum input pressure to 3000 PSI.
Optional 4500 PSI MAX Input
Installing the 300 Bar DIN Adapters, Amron Part No. SAA5300, will increase the 8225-HP and
8225-HP2 to a maximum input pressure limit to 4500 PSI. Simply remove Amron CGA850 yoke
nut and yoke from bleeder body, screw on 300 Bar DIN adapter, and tighten with a wrench.
1. Source select inlet valve handles are color coded Red and Blue to correspond to the Hose Whips
which are also color-coded Red and Blue. This helps the operator identify which valve controls
which tank. For maximum airflow, turn handle counter clockwise four (4) full turns. To shut-off
valve, turn handle clockwise until it stops.
2. Inlet gauge reads actual input pressure of air source. Gauge pressure range is 0-5000 psi;
accuracy is 1-1/2% of Full Scale.
3. Check valves, (HP section) prevents input air from one source flowing into a second lower
pressure source when both source valves are open. This simplifies the switch over from one
SCUBA bottle to another. NOTE: If both source valves are left open with full bottles the bottles
will be drawn from equally.
4. The Amron CGA850 input yokes are standard with bleed valves and color-coded 6-ft. high-
pressure hose whips. The CGA850 input yokes are limited to maximum pressures of 3000 PSI
and fit standard SCUBA bottle valves.

CONTROLS & CONNECTIONS
11
AIR CONTROL (Continued) 6.2
5. A pre-regulator filter prevents debris from contaminating the regulator. Filter element is 50
micron.
6. High pressure TESCOM regulator(s) reduce pressure of incoming air from high-pressure bottles
to a level required by diver’s Hat/Helmet. To increase the diver’s air pressure, turn knob
clockwise to desired setting. To decrease the diver’s air pressure, turn knob counter clock-wise.
Note: Regulator is a non-venting type, in order to reduce the set pressure, air must be flowing through
the regulator.
B. Low Pressure
The Low Pressure Section consists of a LP input, low pressure output of regulator, LP gauge, and diver
connection. A small portion of the LP air is also used when diver depth measurements are made.
Accepts breathing air from a low-pressure source i.e. a low pressure diving air compressor. Note: The
low-pressure section does not regulate the air pressure to the diver. The compressor must be set to
provide the proper pressure to the diver.
Breathing air from the low-pressure side of the regulator or the low-pressure input is routed to the diver’s
breathing air connections. A portion of the low-pressure air is used by the pneumo section for diver depth
measurements.
1. Low pressure input, #6 JIC type fitting. (O2type fitting available).
2. Low-pressure check valve prevents the back flow of air from the HP regulator
output into the LP air source. This also permits simple switch over from LP to HP
air.
3. 1/4 Turn ball valve, controls flow of air to diver, ball valve permits unrestricted flow.
4. Divers air supply gauge reads air pressure to divers, 0-400 PSI.
5. Divers air supply outlet connection, O2(oxygen) type fitting. (37oJIC optional).
6. Pressure relief valve, factory set for 285 PSI, vents excess pressure to
atmosphere. Vent is located between diver output connections.

CONTROLS & CONNECTIONS
AIR CONTROL FRONT PANEL, MODEL 8225-HP 6.3
12

CONTROLS & CONNECTIONS
13
DEPTH MONITORING (PNEUMO) 6.4
The Pneumo Fathometer section is used to measure the diver’s depth. Pneumo readings are made by
pressurizing the diver’s pneumo hose; air is forced through the pneumo hose until all water is displaced.
The air is then shut off, and the pressure is read on a high accuracy gauge calibrated in FSW (feet of
seawater). See Section 8, Page 33, Par. 12 for details. The system components are:
1. Diver pneumo valve (yellow handle) controls the air supply to the pneumo Fathometer system,
one for each diver.
2. Pneumo gauge, dual scale 0-250 FSW/0-76 MSW, mirrored scale, 6 inch, high precision, 0.25%
of full scale accuracy, one for each diver.
3. Diver pneumo outlet connections are O2(oxygen) type fittings. (37oJIC fitting optional).
LOW PRESSURE ALARM 6.5
Monitors the diver’s air pressure. Alarm is factory set to 100 PSI, when pressure drops below the set
point the audio alarm is turned on.
1. ON/OFF switch turns alarm on or off as desired.
2. Audio transducer emits audio tone at 2900 Hz at a level of 90 dB.
3. Pressure switch, (internal) adjustable 25 to 300 PSI set point. Factory set to 100 PSI.

CONTROLS & CONNECTIONS
PNEUMO FRONT PANEL, MODEL 8225-HP 6.6
14

CONTROLS & CONNECTIONS
15
COMMUNICATIONS 6.7
Two-way communications with divers. High power folded acoustic horn, provides ample volume for noisy
environments. Speaker is mounted in the optimum plane to direct sound to the operator.
1. Speaker, 15 watt folded acoustic horn, with talk-back capability.
2. Speaker ON/OFF switch allows operator to shut speaker off when using headset.
3. Speaker automatically disconnects when using the hand-held push to talk microphone. This
eliminates excessive background noise resulting in clear tender to diver communication.
4. Diver to tender and tender to diver voice communication, via a communications cable in the
diver’s umbilical.
Tender Controls
1. “ON/OFF” power switch - applies power to the unit from internal batteries or an external power
source.
2. “Push to talk” switch allows tender to diver communication.
3. “Diver to Tender volume” - is the volume control from diver to tender. Rotate clockwise to
increase volume from diver.
4. Tender to Diver volume” - controls tender volume to the diver. Rotate clockwise to increase
volume to diver.
5. “Hand Held Microphone” - convenient method to talk to divers, automatically activates the push to
talk function and disconnects the talk back speaker reducing background noise. This feature
significantly improves intelligibility.
Tender Connections
1. “Headset Jack” - Dual banana jack (black color) connection for headset, hand held microphone or
remote push to talk module (Model 2821-28). Provides walk/ talk capability.
2. “Microphone Jacks” - Dual banana jack (red color) connection for headset microphone.
3. “Remote Push To Talk Jacks” - Dual banana jack (yellow color) connection for remote push to
talk module (Model 2821-28), or hand held microphone.
Diver controls (separate controls for each diver)
1. “Tender to Diver Volume” - Adjusts volume from Tender to Diver.
2. “Diver to Tender Volume” - Adjust volume from Diver to Tender.
3. “Diver ON/OFF” - cuts off diver, spring-loaded switch returns to ON when released.
4. “Diver Cross-talk” - Permits one diver to talk to the other when operating in the 2-wire mode.
Diver Connections
1. “Diver Input, Microphone” - Dual 5-way binding post connection to diver’s umbilical (used for both
microphone and speakers when operating in the 2-wire mode).
2. “Diver Output, Earphone” - Dual 5-way binding post connection to Diver’s umbilical, (used for
earphone connection when operating in the Simulcom Mode).
Power Connections
1. “Battery Charger/External Power, Jacks” - red = positive, black = negative. Tip jack connection for
battery charger or external battery.
2. “Battery Condition Indicator, LED” - LED light indicates Power On by a steady light. Blinking light,
battery has reached a low level (2-4 hours of operation remain, when light first began to blink).
Light goes out when battery voltage has dropped to a point where the reliable operation of the
unit can no longer be guaranteed.

CONTROLS & CONNECTIONS
COMMUNICATOR FRONT PANEL, MODEL 2825A-8225 6.8
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