Foot Controls |
Overview |
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This section provides information for servicing A-dec foot controls. It includes tubing flow diagrams, exploded illustrations, and troubleshooting tips for Foot Control I, II and III.
85.0812.00, 2003 |
FC-1 |
Foot Controls |
Overview |
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Working with Foot Controls
Foot Control Valves
A foot control is a foot-operated regulator. Handpieces are operated by using a foot control. A-dec foot controls are actuated by applying foot pressure on the foot control disk. The pressure applied to the disk pushes down on a valve assembly allowing air to flow from the valve to handpiece turbines. This turns on air and water coolant.
The A-dec foot control valve has gone through a number of changes over the years. The type of foot control you have will determine the valve configuration.
In A-dec Foot Control I, the valve assembly is hex-shaped and uses a piston to actuate the handpieces. Foot Control II changed the body style of the valve assembly to a square shape and used a stem assembly for actuation. The Foot Control III valve assembly is also square but uses a piston for actuation.
In Foot Control I and Foot Control III, the piston seats the exhaust vent against the poppet and pushes it away from the inlet seat, which opens the valve. When pressure to the foot control cover is released the piston returns, closing the inlet and exhausting any pressure from the outlet side of the valve.
In Foot Control II, the foot pressure on the stem assembly passes the fluted surfaces of the stem to below the inlet o-ring seat, allowing air to flow to the outlet. When foot pressure is released the stem returns, sealing the inlet at the o-ring. Pressure from the outlet side of the valve is exhausted as the fluted stem moves above the outlet o-ring seal.
85.0812.00, 2003 |
FC-2 |
Foot Controls |
Foot Control I |
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Foot Control I
This information applies to foot controls used before October 1999 (38.0010.00, 38.0035.00, 38.0039.00, 38.0040.00 38.0041.00, 38.0045.00, 38.0050.00, 38.0053.00 and 38.0061.00).
NOTE: Asterisk (*) signifies parts that are included in the field service kit.
Before October 1999
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Item # |
Part Number |
Description |
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90.0010.00 |
Foot Control I field service kit |
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1 |
22.0110.00 |
Foot control cover, fits all foot controls |
2 |
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2 |
38.0320.00 (01, 02) |
Foot control housing, 1-hole |
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38.0321.00 (01, 02) |
Foot control housing, 2-hole |
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3 |
22.0120.00 |
FC I retaining ring (includes screws) |
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4 |
38.0610.00 |
Chip blower valve |
7 |
13 |
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38.0612.00 |
Scaler valve |
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4 |
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*5 |
22.0135.00 |
Spring |
14 |
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6 |
38.0604.00 |
Wet/dry toggle valve |
8 |
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7 |
22.0081.00 |
Piston assembly |
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*8 |
22.0580.00 |
Spring |
9 |
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*9 |
22.0060.00 |
Plastic poppet |
12 |
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10 |
22.0050.00 |
Spring cap |
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*11 |
030.016.02 |
O-ring pkg 10 |
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*12 |
22.0040.00 |
Spring |
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*13 |
10.0440.00 |
Spring |
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*14 |
22.0778.00 |
Signal relay valve stem |
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16 |
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*15 |
38.0054.02 |
Diaphragm pkg 10 |
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16 |
002.015.00 |
Screw, pan head phillips pkg 2 |
Foot Control I |
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85.0812.00, 2003 |
FC-3 |
Foot Controls |
Foot Control I Flow Diagram |
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Foot Control I valve |
Foot Control I |
Signal |
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valve |
Wet/dry toggle |
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relay valve |
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valve |
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Optional chip blower |
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or scaler valve |
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Exhaust hole |
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Foot Control I Valve Assembly
From air
regulator
Diaphragm
Signal relay valve
To control head
Foot Control I Cross View
85.0812.00, 2003 |
FC-4 |
Foot Controls |
Foot Control II |
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Foot Control II
NOTE: Asterisk (*) signifies parts that are included in the field service kit.
Item # |
Part Number |
Description |
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90.0312.00 |
Foot control II field service kit |
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1 |
22.0110.00 |
Foot control cover, fits all foot controls |
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2 |
38.0237.00 |
Retaining ring, internal, Black |
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338.0320.00 (01, 02) Foot control housing, 1-hole
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38.0321.00 (01, 02) |
Foot control housing, 2-hole |
4 |
38.0610.00 |
Chip blower valve |
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38.0612.00 |
Scaler valve |
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*5 |
38.0246.00 |
Stem with E-ring |
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*6 |
38.0552.00 |
Ring return valve stem |
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7 |
38.0604.00 |
Wet/dry toggle valve |
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*8 |
013.011.00 |
Spring |
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*9 |
030.008.02 |
O-ring, AS568-008 |
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*10 |
38.0054.02 |
Diaphragm |
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11 |
38.0056.00 |
Replacement signal relay valve |
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*12 |
030.012.02 |
O-ring, AS568-012 |
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13 |
003.078.00 |
Socket head screw |
WARNING
Turn the master On/Off toggle to the OFF position and bleed system air pressure before removing the foot control disc to prevent the foot control stem from being forcefully ejected.
1
2
3
5
4
6
7 8
11
9
12
13
Foot II
FC-5
85.0812.00, 2003
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