A-Dec 3420 Operation And Maintenance Instructions - page 12
Routine Adjustments
System Air Pressure
The air filter/regulator (see Figure 27) controls
the system air pressure and is preset to 80 psi
(552 kPa). If the system pressure is not 80 psi
(552 kPa), simply lift the adjustment knob and
turn clockwise to increase pressure and turn
counterclockwise to decrease pressure. When
adjusting to decrease pressure, press the syringe
air button before reading the gauge.
Handpiece Drive Air Pressure
Adjust the drive air pressure to meet the hand-
piece manufacturer’s dynamic drive air pressure
specification. Refer to the documentation that
came with your handpiece for the dynamic drive
air pressure specification.
You will need a 3⁄32" hex key to complete this
adjustment.
1. Install a bur in the handpiece.
2. Locate the drive air pressure gauge (see
Figure 27) and the drive air pressure control
(see Figure 25).
3. Move the wet/dry toggle on the foot control
to the OFF position, away from the blue dot
(see Figure 26).
4. Turn the drive air pressure flow control
clockwise until the valve seats.
5. Fully depress the foot control disc.
6. While running the handpiece, watch the
drive air pressure gauge and adjust the
handpiece drive air pressure.
• Turn the drive air control counterclockwise
to increase drive air pressure flow.
• Turn the control clockwise to decrease flow.
7. Repeat steps 1 through 6 for each handpiece.
Handpiece Coolant Air Flow
The coolant air flow control is used to adjust
the coolant air flow to all handpieces.
You will need an adjustment key or a 1⁄8" hex
key to complete this adjustment.
1. Install a bur in the handpiece.
2. Locate the coolant air flow control
(see Figure 25).
3. Move the wet/dry toggle on the foot control
to the OFF position, away from the blue dot
(see Figure 26).
4. Insert an adjustment key, or a 1⁄8" hex key,
into the coolant air flow control.
5. Fully depress the foot control disc to acti-
vate the handpiece.
6. Adjust the coolant air flow to fit your
needs.
A strong flow of air is recommended.
• Turn the control clockwise to decrease the
flow or counterclockwise to increase the
flow.
7. The coolant air is set for all handpieces.
Handpiece Coolant Water Flow
The coolant water flow controls are used to
adjust the flow of coolant water to each hand-
piece.
You will need an adjustment key or a 1⁄8" hex
key to complete this adjustment.
1. Install a bur in the handpiece.
2. Locate the coolant water flow controls
(see Figure 25).
3. Move the wet/dry toggle on the foot control
to the On position, toward the blue dot
(see Figure 26).
4. Insert an adjustment key, or a 1⁄8" hex key,
into the coolant water flow control for the
handpiece being adjusted.
5. Hold the handpiece over a receptacle. Be
sure to hold the handpiece so that the
water will be directed away from you and
into the receptacle.
Then, fully depress the foot control disc to
activate the handpiece.
6. Adjust the coolant water flow to fit your
needs.
• Turn the control clockwise to decrease the
flow or counterclockwise to increase the
flow.
7. Repeat steps 1 through 6 for each handpiece.
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85.0681.00 Rev J
20
50
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100
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7
psi
kg/cm
2
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80
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100
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7
psi
kg/cm
2
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100
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2
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100
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psi
kg/cm
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Figure 27. Adjust the system air pressure.
Adjustment knob
Air filter/ regulator
Drive air
pressure gauge
System air
pressure gauge
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