Kirby Air Conditioner 5 User Manual download pdf (Page 20)

KMACS 5 MANUAL

reading of the bottom depth. In an emergency, the

pneumo air can be used as a breathing air supply

for a diver. The diver tells the KMACS 5 operator

to “Turn on the pneumo-air...”, then inserts the hose

into the mask or helmet. When using the pneumo in

this mode the air pressure should be regulated by

the KMACS 5 operator to be slightly greater than

the diver’s depth. For example, if the diver is at 100

feet (30 meters), the pneumo should be opened until

the gauge reads a depth of 110 feet (33 meters), so

that a positive pressure exists.

The diver should practice using the pneumo as an

alternative air source under controlled conditions in

shallow water. The pneumo hose should be bubbling

when it is inserted in the diver’s mask, otherwise the

diver will receive a blast of water when the pneumo

is ﬁrst turned on.

2.9 DIVER AT DEPTH

Once the diver reaches the bottom, or his maxi-

mum planned depth, the diver should inform the

KMACS 5 operator that he is, “On the bottom.” At

this time, the KMACS 5 operator should ensure that

he gets an accurate depth reading. The KMACS 5

operator should inform the diver that he is “Taking a

pneumo...”, when he opens the pneumo purge valve.

The diver should observe the end of the pneumo

hose and immediately inform top side that, “He has

bubbles...”. Once the diver has a ﬂow of bubbles at

the end of the hose, the pneumo valve (D,O) should

be closed immediately.

Should the diver move deeper at any time during

his dive he must inform the KMACS 5 operator

and another pneumo should be taken for a new

maximum depth reading. If the KMACS 5 operator

knows that the diver is moving over an uneven bot-

tom he should periodically take additional pneumo

readings to ensure that the diver has not accidentally

gone deeper and neglected to notify top side. Keep

in mind, however, that every pneumo reading does

use some air. If high pressure air is the air source

and the dive is deep, or the diver is working hard,

pneumo readings should be taken as sparingly as

possible.

2.10 CHANGING OUT HIGH PRESSURE

CYLINDERS

The KMACS 5 operator should continuously moni-

tor the diver’s air supply at the two high pressure

gauges (L,M) when diving with high pressure air as

the primary supply. When the initial supply source

pressure drops to between 300 and 500 psi (20.7 and

34.5 bars), depending upon depth, the diver should

be switched over to the second air source using the

selector valve handle (I). While the diver is breathing

off the secondary source a fresh cylinder should be

put on line immediately.

To change out high pressure cylinders, ﬁrst close

the cylinder valve on the tank which is low. Once

the valve is closed, open the bleeder valve on the

yoke (S) and allow the pressure to bleed from the

line. The high pressure whips are color coded to help

the KMACS 5 operator to ensure he is selecting the

correct one. Always observe the umbilical pressure

gauge (B) carefully during this procedure. If the

KMACS 5 operator is not careful he may acciden-

tally turn off the high pressure cylinder supplying

the diver’s breathing air. If the umbilical pressure

gauge (B) needle starts to “fall”, turn the cylinder

back on immediately and double check to ensure

the correct cylinder is being changed.

When the high pressure whip is empty, unscrew the

knurled knob on the yoke (S) and attach the yoke

to a fresh cylinder. Tighten the yoke knob ﬁnger

tight, close the bleeder valve, and slowly open the

cylinder tank valve. Read the new pressure on the

appropriate gauge (L,M).

2.11 PROCEDURES DURING THE

DIVER’S ASCENT

At the end of the dive, the diver should prepare

to leave bottom upon orders from the KMACS 5

operator. The KMACS 5 operator must carefully

note the diver’s depth and time on the dive log. The

KMACS 5 operator is responsible for monitoring the

diver’s ascent rate which should not exceed 60 feet

(18 meters) per minute, or slower if a dive computer

is being used to monitor decompression/no decom-

pression status. The diver should not leave the bot-

tom until he is instructed to do so by the KMACS 5

operator. At the start of the diver’s ascent he should

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Kirby Air Conditioner 5 User Manual Page 20

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