A-dec Foot Controls User manual
85.0812.00, 2003 FC-1
Foot Controls Overview
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-2
Foot Controls Overview
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-3
Foot Controls Foot Control I
Item # Part Number Description
— 90.0010.00 Foot Control I field service kit
1 22.0110.00 Foot control cover, fits all foot controls
2 38.0320.00 (01, 02) Foot control housing, 1-hole
38.0321.00 (01, 02) Foot control housing, 2-hole
3 22.0120.00 FC I retaining ring (includes screws)
4 38.0610.00 Chip blower valve
38.0612.00 Scaler valve
*5 22.0135.00 Spring
6 38.0604.00 Wet/dry toggle valve
7 22.0081.00 Piston assembly
*8 22.0580.00 Spring
*9 22.0060.00 Plastic poppet
10 22.0050.00 Spring cap
*11 030.016.02 O-ring pkg 10
*12 22.0040.00 Spring
*13 10.0440.00 Spring
*14 22.0778.00 Signal relay valve stem
*15 38.0054.02 Diaphragm pkg 10
16 002.015.00 Screw, pan head phillips pkg 2
Foot Control I
7
9
1
3
2
4
6
5
8
10
11
12
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).
15
14
13
16
Foot Control I
NOTE: Asterisk (*) signifies parts that are included in the field service kit.
Before October 1999
85.0812.00, 2003 FC-4
Foot Controls Foot Control I Flow Diagram
Optional chip blower
or scaler valve
Foot Control I valve
Wet/dry toggle
valve
From air
regulator
To control
head
Foot Control I Cross View
Signal relay
valve
Diaphragm
Foot Control I Valve Assembly
Foot Control I
valve
Signal
relay valve
Exhaust hole
85.0812.00, 2003
FC-5
Foot Controls Foot Control II
Item # Part Number Description
— 90.0312.00 Foot control II field service kit
1 22.0110.00 Foot control cover, fits all foot controls
2 38.0237.00 Retaining ring, internal, Black
3 38.0320.00 (01, 02) Foot control housing, 1-hole
38.0321.00 (01, 02) Foot control housing, 2-hole
4 38.0610.00 Chip blower valve
38.0612.00 Scaler valve
*5 38.0246.00 Stem with E-ring
*6 38.0552.00 Ring return valve stem
7 38.0604.00 Wet/dry toggle valve
*8 013.011.00 Spring
*9 030.008.02 O-ring, AS568-008
*10 38.0054.02 Diaphragm
11 38.0056.00 Replacement signal relay valve
*12 030.012.02 O-ring, AS568-012
13 003.078.00 Socket head screw
Foot Control II
8
9
1
2
3
4
7
5
10
11
6
13
12
Foot Control II
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.
NOTE: Asterisk (*) signifies parts that are included in the field service kit.
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