A-Dec 3420 Operation And Maintenance Instructions - page 11
Control Functions
Unit On/Off. To turn your Pac I unit ON, simply
connect the unit supply air tubing (see Figure
18) to the compressor or bottled gas (refer to
About Your Pac I).
To turn the unit OFF, disconnect the unit from
the compressor or bottled gas.
Handpiece Selector (see Figure 24) controls
which one of the two handpieces will be operat-
ed when you press the foot control disc.
Drive Air Pressure Flow Controls (see Figure
25)are used to adjust the drive air pressure to
each handpiece. To adjust drive air pressure,
refer to Routine Adjustments, Drive Air Pressure.
Coolant Air Flow Control (see Figure 25) adjusts
the flow of coolant air to both handpieces.
Turned fully clockwise, it completely shuts off
the coolant air. To adjust coolant air flow, refer
to Routine Adjustments, Handpiece Coolant Air
Flow.
Coolant Water Flow Controls (see Figure 25) are
used to adjust the flow of coolant water to each
handpiece. To adjust coolant water flow, refer
to Routine Adjustments, Handpiece Coolant
Water Flow.
Air Pressure Gauges
System Air Pressure Gauge (see Figure 25)
displays air pressure coming from the air filter/
regulator. The reading should be 70–80 psi
(483–552 Kpa).To adjust the system pressure,
refer to Routine Adjustments, System Air
Pressure.
Drive Air Pressure Gauge (see Figure 25) displays
drive air pressure to the selected handpiece.
Use this gauge to adjust the drive air pressure to
the handpiece manufacturer’s specifications, as
described in Routine Adjustments, Drive Air
Pressure.
Foot Control
The foot control (see Figure 26) modulates drive
air to the active handpiece and provides air sig-
nal that activates the coolant air and coolant
water flow. The foot control is operated by light
foot pressure applied to any part of the foot
control disc.
Wet/Dry Toggle (see Figure 26) allows you to
shut off coolant water to the handpieces with-
out moving your hands from the oral cavity.
Using your foot, move the toggle away from the
blue dot to turn coolant water off. Move the
toggle toward the blue dot to turn coolant water
on.
Optional Chip Blower Button (see Figure 26)
sends a jet of air through the handpiece when it
is not running.
85.0681.00 Rev J
Page
7
Figure 26. Foot Control
Foot control disc (use to
modulate handpiece drive
air flow.)
Optional chip
blower button
Wet/dry toggle
blue dot
50
60
70
80
90
100
4
5
6
7
psi
kg/cm2
20
50
0
10
30
40
60
70
80
90
100
0
1
2
3
4
5
6
7
psi
kg/cm2
Figure 24. Handpiece selector
Handpiece
selector
20
50
0
10
30
40
60
70
80
90
100
0
1
4
5
6
7
psi
kg/c
m
2
20
50
0
10
30
40
60
70
80
90
100
0
1
4
5
6
7
psi
kg/c
m
2
1
2
+
Figure 25. Pac I handpiece controls
Coolant water flow
controls
Coolant air flow
control
Drive air pressure flow
controls
Drive air
pressure
gauge
System air
pressure
gauge
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