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THEORY OF OPERATION
MECHANICAL (cont’d)
9.1
6A.
Make sure the breathing air source is dry. Scuba cylinders should be filled from a
compressor with a good filtration system. The air source for the filling compressor should
be from outdoors, and the filling of the tanks should be done on a cold dry day.
6B.
Place the AMCOMMAND II and the bottles in a warm location. This can be a temporary
shelter with a portable heater.
7.
Relief Valve, factory set to 285 PSI. This valve is set to relief the system pressure in the
event the regulator should fail to control the pressure. The exhaust port for this valve is
located between the diver output connections. If this valve should ever vent during a
dive, the dive should be terminated immediately. Correct the cause of the problem before
using the system again. You can control the outlet pressure by using the input valve (HP-
1 or HP-2) as a throttle valve, closing the valve to reduce the pressure to the system.
Open the valve slightly upon reaching the approximate pressure required, adjust the valve
slightly to match the flow required by the diver. You can advise the diver to go to free flow,
which will maintain a constant flow rate making it easier to control the pressure.
8.
LP input, the input is straight forward using a check valve to eliminate the need for another
panel valve and facilitate switching from LP to HP air.
9.
Output gauge, monitors the pressure to the diver. Gauge range is 0-400 PSI, 1-1/2% of
full-scale accuracy.
10.
Diver output valves, 3/8 inch ball valves, 1/4 turn full open, unrestricted flow -- One valve
for each diver.
11.
Low-pressure alarm, monitors diver’s breathing air pressure, audio alarm is factory set to
come on at 100 PSI. Accuracy is +/-15 PSI. Audio alarm set point is internally set, and can
be adjusted to turn on anywhere between 30 and 285 PSI. Audio output is approximately
90 dB at 2900 Hz. The alarm has an ON/OFF switch to disable the alarm. The diver
communicator supplies power for the audio alarm. Power is available regardless of
whether the communicator is on or not.
12.
Pneumo Fathometer system, the depth measurement system consists of the two depth
gauges, blow down valves, output connections, and gauge protectors. The operation of the
pneumo system is based upon the density of seawater that is 64.043 lb/ft3. The weight of a
column of sea water one inch, by one inch, by one foot in height is .44473 (64.043 lbs.
divided by 144 sq. inches). For underwater calculations this is rounded off to three places
or .445 lbs. per square inch. Therefore by measuring the pressure, we can calculate the
depth. To avoid doing the calculation we use a very accurate gauge that reads the
pressure in pounds per square inch, but has the dial calibrated in Feet of Seawater.
Note:
Fresh water has a density of 62.366 lbs/ft3, therefore the same calculations equals .433 lbs.
per square inch. These differences must be taken into consideration when diving in fresh water,
particularly decompression stops. See Section 10 for fresh water vs. sea water tables, “Diver’s
Handbook of Underwater Calculations”, or U.S. Navy Diving Manual for additional information
regarding fresh water diving.
33
Summary of Contents for 8225-HP
Page 16: ...CONTROLS CONNECTIONS AIR CONTROL FRONT PANEL MODEL 8225 HP 6 3 12...
Page 18: ...CONTROLS CONNECTIONS PNEUMO FRONT PANEL MODEL 8225 HP 6 6 14...
Page 20: ...CONTROLS CONNECTIONS COMMUNICATOR FRONT PANEL MODEL 2825A 8225 6 8 16...
Page 29: ...OPERATING PROCEDURES DIAGRAM SET UP INSTRUCTIONS Figure 3 8 7 25...
Page 31: ...OPERATING PROCEDURES DIAGRAM SIMULCOM 4 Wire Connection Model 2825 8225 Figure 4 8 9 27...
Page 39: ...THEORY OF OPERATION FLOW DIAGRAM MODEL 8225 HP 9 2 35...
Page 42: ...THEORY OF OPERATION FUNCTIONAL BLOCK DIAGRAM MODEL 2825 8225 9 4 38...
Page 52: ...REFERENCE MATERIAL DIVING LOG U S NAVY CHART 12 1 48...
Page 53: ...REFERENCE MATERIAL REPETITIVE DIVE WORKSHEET 12 2 49...
Page 58: ...DRAWINGS SCHEMATICS SCHEMATIC DIAGRAM MODEL 2825A 8225 13 1 54...
Page 59: ...DRAWINGS SCHEMATICS PARTS IDENTIFIER 2832 202 13 2 55...
Page 60: ...DRAWINGS SCHEMATICS SCHEMATIC DIAGRAM 28FDW OPTION 13 3 56...
Page 61: ...DRAWINGS SCHEMATICS SCHEMATIC PARTS LOCATOR MODEL 2324 202 13 4 57...
Page 62: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 8225 200 Pneumo Front Panel 13 5 58...
Page 63: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 8225 200 Pneumo Back Panel 13 6 59...
Page 64: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 8225 400HP Air Control Front Panel 13 7 60...
Page 65: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 8225 400HP Air Control Back Panel 13 8 61...
Page 66: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 8225 400HP2 Air Control Front Panel 13 9 62...
Page 67: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 8225 400HP2 Air Control Back Panel 13 10 63...
Page 68: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 2825A 8225 28FDW Diver Communications 13 11 64...
Page 69: ...DRAWINGS SCHEMATICS 65 PARTS LOCATOR MODEL 8000 0201 Regulator 13 12...