KMACS 5 MANUAL
hoses to the mask or helmet, (refer to the manual for the mask or helmet for the proper connection procedures for your life support equipment). This action will prevent any foreign matter from entering the helmet or mask breathing system. Once the hose is blown out, immediately connect the fitting on the hose to the fitting on the mask or helmet.
Connect the communications portion of the diver’s umbilical to the communications fittings on the communicator and to the mask or helmet. Be sure the proper connection is made with the right com- munications line for each diver. The wires in the diver’s umbilical should be marked so it is easy to identify which plug connects to the earphone ter- minals and which plug connects to the microphone terminals.
2.5 PRE-DIVE CHECK
Prior to EVERY dive, the following should be checked:
With the free flow and demand regulator on the mask/helmet(s) shut off, turn on the air supply at each of the air cylinders. During operation with scuba bottles as the main supply, the selector valve handle must be FULLY up or FULLY down. Fully up turns the “BLUE” supply on and the “ORANGE” supply off. Fully down turns the “ORANGE” sup- ply on and the “BLUE” supply off.
Note the air pressure in each cylinder by reading the gauges (L,M). The low pressure supply should be switched “OFF” at the source at this time. A check valve in the low pressure system prevents back flow to the compressor.
Both cylinders should be full prior to diving. Load the regulator on the KMACS 5 using the regulator adjustment knob (H). Observe the umbilical hose pressure (B) which should be set at 150 psi (10.3 bars) over top side pressure, or 165 psi (11.5 bars) The regulator used in the KMACS 5 is a
by bleeding either the pneumo system or diver’s breathing apparatus.
As the diver descends, the KMACS 5 operator should increase the regulator setting so that the
umbilical pressure is always 150 psi (10.3 bars) over the pressure at the diver’s depth. Consult the table below for approximate pressure settings.
TABLE 1
Suggested Regulator settings for the KMACS 5
| Depth - fsw | Pressure | Optimal | Minimum |
| 0’ | 14.7 psia | 150 psig | 150 psig |
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| 33’ | 29.4 psia | 165 psig | 150 psig |
| 66’ | 44.1 psia | 180 psig | 150 psig |
| 99’ | 58.8 psia | 195 psig | 160 psig |
| 132’ | 73.5 psia | 210 psig | 175 psig |
| 165’ | 88.2 psia | 225 psig | 190 psig |
| 198’ | 102.9 psia | 225 psig | 205 psig |
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TABLE 1, Metric
Suggested Regulator settings for the KMACS 5
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| Pressure | Optimal | Minimum | |
0 | 1 bar | 10.3 bars | 10.3 bars | |||
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| 10 | 2 bars | 11.4 bars | 10.3 bars | ||
20 | 3 bars | 12.4 bars | 10.3 bars | |||
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| 30 | 4 bars | 13.4 bars | 11.0 bars |
40 | 5 bars | 14.5 bars | 12.1 bars | |||
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| 50 | 6 bars | 15.5 bars | 13.1 bars | |
60 | 7 bars | 15.5 bars | 14.1 bars | |||
2.5.1 TESTING L.P. SUPPLY
With the air on at the bottles and the communications switched on, check the regulator function. The diver should insert his face in the mask/helmet and take several breaths to test the demand regulator.
To test the low pressure supply, place the selector valve handle (I) in the “H.P. OFF” zone and the console will be running off the low pressure supply only. Observe the umbilical pressure gauge (B). As the compressor cycles, the gauge will rise and fall as the compressor’s volume tank fills and empties. The maximum pressure for the L.P. inlet should be 225 psi. Again, check the mask/helmet function which will also confirm the low pressure supply routing.
10 | © 2003 KMDSI Document # 041112001 |
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