Page 1
Service Procedures
for the Model 20 Dryers
(AD-20, SL20, CG20, D20, and
STI-8 Dryers GEN II)
ADC Part No. 450261
Page 2
Retain This Manual in a Safe Place for Future Reference
This product embodies advanced concepts in engineering, design, and safety. If this product is properly
maintained, it will provide many years of safe, efficient, and trouble free operation.
Only qualified technicians should service this equipment.
OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation
manual included with the dryer.
The following “FOR YOUR SAFETY” caution must be posted near the dryer in a prominent location.
FOR YOUR SAFETY
Do not store or use gasoline
or other flammable vapors
and liquids in the vicinity of
this or any other appliance.
We have tried to make this manual as complete as possible and hope you will find it useful. The manufacturer
reserves the right to make changes from time to time, without notice or obligation, in prices, specifications,
colors, and material, and to change or discontinue models. The illustrations included in this manual may not
depict your particular dryer exactly .
POUR VOTRE SÉCURITÉ
Ne pas entreposer ni utiliser d’essence
ni d’autres vapeurs ou liquides
inflammables à proximité de cet
appareil ou de tout autre appareil.
IMPORTANT
For your convenience, log the following information:
DATE OF PURCHASE __________________________________________________ MODEL NO. ________________________
RESELLER’S NAME ______________________________________________________________________________________
SERIAL NUMBER(S) ______________________________________________________________________________________
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
Replacement parts can be obtained from your reseller or the ADC factory. When ordering replacement part s
from the factory , you can F AX your order to ADC at (508) 678-9447 or telephone your order directly to the ADC
Parts Department at (508) 678-9000. Please specify the dryer model number and serial number in addition
to the description and part number, so that your order is processed accurately and promptly.
IMPORTANT NOTE TO PURCHASER
Information must be obtained from your local gas supplier on the
instructions to be followed if the user smells gas. These instructions
must be posted in a prominent location near the dryer .
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IMPORTANT
You must disconnect and lockout the electric
supply and the gas supply or the steam supply
before any covers or guards are removed from
the machine to allow access for cleaning,
adjusting, installation, or testing of any equipment
per OSHA (Occupational Safety and Health
Administration) standards.
Please observe all safety precautions displayed
on the equipment and/or specified in the
installation manual included with the dryer .
Table of Contents
Part Locations and Removal ................ 4
Lower Front Panel Removal ......................................... 4
Upper Front Panel Removal ......................................... 4
Back Guard Removal ................................................... 5
T op Cover Removal....................................................... 5
Lint Box / Blower Assembly Removal........................... 5
Gas V alve Removal ...................................................... 7
Oven Removal .............................................................. 7
CAUTION
Dryer(s) should never be left unattended while in
operation.
“Caution: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper operation.”
«Attention: Lor des opérations d’entretien des
commandes étiqueter tous fils avant de les
déconnecter. T oute erreur de câblage peut étre
une source de danger et de panne.»
WARNING
Children should not be allowed to play on or near
the dryer(s). Children should be supervised if near
dryer(s) in operation.
Under no circumstances should the dryer door
switch(es), lint door/drawer switch(es), or heat
safety circuit(s) ever be disabled.
Tumbler Support Wheel Assembly Replacement ......... 8
Tumbler Alignment ....................................................... 9
Electrical Component Locations........ 10
Electrical Panel ......................................................... 10
Oven Contactor .......................................................... 10
Door Switch ............................................................... 10
Fire Suppression System Items and Sail Switch ........11
Direct Sp ark Ignition (DSI) Module ..............................11
Flame-Probe ...............................................................11
Flame-Probe Positioning.............................................1 1
Exhaust Probe, Exhaust Hi-Limit, and Lint Drawer
Switch........................................................................ 1 2
Rotation Switch ......................................................... 12
Belt Installation ................................... 13
The dryer must never be operated with any of the
back guards, outer tops, or service panels
removed. Personal injury or fire could result.
The dryer must never be operated without the lint
filter/screen in place, even if an external lint
collection system is used.
FOR YOUR SAFETY
Do not dry mop heads in the dryer . Do not use
dryer in the presence of dry cleaning fumes.
The dryers must not be installed or stored in
an area where it will be exposed to water
and/or weather.
The wiring diagram for the dryer is located in
the front electrical control box area.
Placing the Belt Back on the Motor Sheave............... 1 5
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Part Locations and Removal
LOWER FRONT PANEL REMOVAL:
Remove the lint drawer. Remove the four screws located just below the loading door . Tilt the top of the panel
out and lift the panel up and away from the dryer.
UPPER FRONT PANEL REMOVAL:
Remove the four screws located just above the loading door. Tilt the bottom of the p anel out and lift the panel
up and away from the dryer.
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BACK GUARD REMOV AL:
TOP COVER REMOVAL:
Remove all facing visible screws.
With the back guard removed, the top is removed
by pulling it toward the rear of the dryer and up.
LINT BOX / BLOWER ASSEMBLY REMOVAL:
Unplug wires from Direct Spark Ignition (DSI)
module.
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Remove screws and nuts at the rear of the lint box.
Unplug wires from the capacitor.
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LINT BOX / BLOWER ASSEMBLY REMOVAL (continued):
Remove two screws just above the lint drawer.
Unplug three connections at the left of the lint box.
The lint box may now be pulled out through the front
of the dryer.
Pull the lint box down from the front and out slightly .
T o remove motorized impellor assembly , remove five
screws and four nuts shown at the arrows.
Lift off cover and pull motorized impellor assembly out through the opening.
6 American Dryer Corp. 450261-2
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GAS V AL VE REMOVAL:
OVEN REMOV AL:
Be sure to shut off the gas main and then proceed
to remove electrical connections and screws
indicated. Disconnect union and U-Bolt located just
behind the union and the oven base. The U-Bolt is
more easily accessed through the rear of the dryer.
The gas valve and burner orifice can now be pulled
out through the front of the dryer.
When reinstalling the gas valve be sure to align the
orifice with the opening in the burner tube bracket.
Misaligning and forcing valve inward can drive the
opposite end of the burner tube up against the
flame-probe elements.
The oven can be removed with or without the gas
valve in place.
Be sure to shut off the gas supply to the dryer . The
back guard, heat duct, and lower front panel must
be removed. Remove the gas valve electrical
connections and remove the lint box / blower
assembly. Remove the five screws (shown lower
right) that are holding the burner to the rear bulkhead.
Remove the two oven base nuts. With the lint box
out of the way , the oven can be tilted on its side and
pulled out through the front of the dryer.
Heat Duct
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TUMBLER SUPPORT
WHEEL ASSEMBLY REPLACEMENT:
The front wheel assemblies can be replaced with
the lower front panel removed. Remove the three
bolts by reaching upward with a socket or box
wrench. The illustration on the right is provided to
show the location of these wheels as the wheels
cannot easily be seen while standing in front of the
dryer.
The left rear wheel assembly can be removed with
just the back guard removed. The rear right wheel
requires removing the back guard, heat duct, and
oven.
All wheel assemblies are mounted on slots to allow
for alignment of the tumbler. After one or more wheel
assemblies are replaced, the tumbler must be
realigned.
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TUMBLER ALIGNMENT:
Proper alignment is achieved by making the gap
between the tumbler and openings in the front and
rear bulkheads equal on all sides.
The gap may be checked for accuracy by using a
thickness gauge.
Adjust the tumbler position by loosening the three
bolts and forcing the wheel assembly toward the
center of the dryer to raise the tumbler and to move
it away from the side. A large screwdriver can
provide the necessary leverage.
Adjustment of the front of the tumbler is made the
same as the rear. The gap on the top, bottom, left
and right are to be made equal by moving the wheel
assemblies.
EXAMPLES:
Below, both wheel assemblies must be moved to
the right in order to move the tumbler right. The left
wheel assembly must move a little more than the
right in order to lift the tumbler.
Below, both wheel assemblies must be moved
inward in order to move the tumbler straight upward.
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Electrical Component Locations
ELECTRICAL PANEL:
The electrical panel is located behind the front upper panel.
F1
J11
T erminal
Block
A
B
C
Relay 3
Drive
Relay 2
Blower
Relay 1
Door Switch
P14
Transformer
25VAC
OVEN CONTACTOR:
Lower right front of the dryer (electric oven models).
Oven Contactor
J5
DOOR SWITCH:
On upper front panel.
Door Switch
10 American Dryer Corp. 450261-2
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FIRE SUPPRESSION SYSTEM ITEMS
AND SAIL SWITCH:
Rear of the dryer.
Water
Pressure
Switch
Solenoid
Valve
Sail
Switch
DIRECT SPARK IGNITION (DSI) MODULE:
Lower right front of the dryer to left of the lint box.
Thermistor Probe
FLAME-PROBE:
Under the gas oven and accessed from the rear of
the dryer.
Screw locations at arrows.
DSI Module
FLAME-PROBE POSITIONING:
Viewed from the rear of the dryer with heat duct
removed. Proper spark gap is approximately 1/8”
(3.175 mm) and is located 1/4” (6.325 mm) from
the rear of the left edge of the burner tube as shown.
(Guard against allowing elements to touch the burner
tube.)
NOTE: For clarity the illustration has the flame plate
normally located just after the flame sensing probe
removed.
Flame-probe spark gap
directly over the left
edge of burner tube
Flame-probe
element as shown
Correct positioning of the
flame-probe elements.
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EXHAUST PROBE, EXHAUST HI-LIMIT,
AND LINT DRAWER SWITCH:
Temperature probe and exhaust hi-limit are
accessible once the lint box is removed. The lint
drawer switch can be removed after the cover has
been removed.
Exhaust Hi-Limit Switch
Exhaust Temperature Probe
ROTATION SWITCH:
Just behind the upper front panel, as viewed from
the rear of the dryer with top removed.
Lint Drawer Switch
Rotation
Switch
Magnet
Rotation
Switch
12 American Dryer Corp. 450261-2
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Belt Installation
REQUIRED ITEMS:
4 feet of Number 16 or 18 Electrical Wire
Duct Tape
Phillips Screw Driver
5/16” Nut Driver
Electrical Tape
3 foot Section of 1-1/2” Electrical Tubing
One 6-inch Cable Tie
Replacement Belt
Remove the back guard, front upper panel, and front lower panel. Cut the locking end off the plastic wire tie
and use a piece of electrical tape to secure the wire tie to one end of the 4-foot section of electrical wire
(Fig. 1).
FIG . 1
FIG . 2 FIG . 3
Push the wire tie between the tumbler felt and the middle front panel ring at highest position of the tumbler
(Fig. 2). The wire tie must exit beyond the top of the tumbler (Fig. 3). Be careful NOT to damage the rotational
sensor. Take hold of the end of the wire tie, pull it and the electrical wire attached to it until 2 feet of wire
remains hanging inside the tumbler (Fig. 4). Att ach the replacement belt to the end of the electrical wire still
hanging in the tumbler by making a loop in the wire and taping the loop closed with electrical tape (Fig. 5).
Squeeze the belt flat between your fingers (Fig. 6).
FIG . 4
FIG . 5 FIG . 6
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Pull the belt up through the tumbler felt until there is enough belt to begin to loop the belt around the tumbler
(Fig. 7 and 8). Tape the belt to the outside of the tumbler with duct tape approximately 2-inches from the
outside edge of the tumbler (Fig. 9). Rotate the tumbler slowly in the clockwise direction, while pulling the end
of the belt to the right side of the dryer. Continue to rotate the tumbler clockwise and proceed to t ape the belt
to the outside of the tumbler occasionally , to aid in holding the belt in place (Fig. 10).
FIG . 7
FIG . 8 FIG . 9
Guide the belt over the top of the front right tumbler roller, while continuing to turn the tumbler clockwise (Fig.
1 1). The end will pass between the top of the lint box and the tumbler . Guide the belt over the top of the front
left roller (Fig. 12).
FIG . 10
FIG . 1 1 FIG. 12
Continue to turn the tumbler clockwise while feeding the belt out of the tumbler, until only a few inches are left
in the tumbler. Pull the remaining belt out of the tumbler into the area above the tumbler , until only a few inches
remain in the tumbler (Fig. 13).
FIG . 13
14 American Dryer Corp. 450261-2
FIG . 14
Page 15
Pulling the belt through the tumbler felt gap will tend to flip the felt. Before pulling the last few inches out of the
tumbler, lace the electrical wire back through the loop in the belt (Fig. 13 on the previous p age).
Pull the remaining belt and a couple of inches of wire out of the tumbler and into the area above the tumbler.
Slide the belt to the middle of the tumbler. With the electrical wire pulled tight (Fig. 14 on the previous p age),
rotate the tumbler one or two turns. This should flip the felt back to the original position. Feeling that the felt
is even all the way around the tumbler indicates the felt is back to original position. Remove the electrical wire.
The belt is now wrapped around the tumbler and ready for installation on the drive motor sheave.
PLACING THE BELT BACK ON THE MOTOR SHEAVE:
One proven method used to pull the belt back onto the sheave involves using a two foot length of electrical
conduit (Fig. 15). Preparing the end of the conduit as shown makes it easier to use. Position the belt around
the tumbler and directly above the motor sheave (Fig. 16). Insert the conduit through the belt and onto the
motor sheave (Fig. 17).
FIG . 15
FIG . 16 FIG. 17
While pushing the electrical tubing, pull the end toward the bottom right corner (Fig. 19). From this position,
rotate the conduit clockwise. The belt will move to a position over the motor sheave. Hold the belt against the
motor (Fig. 18). Rotate the conduit one more revolution while pulling the conduit out. The belt should drop
onto the motor sheave. Rotate the tumbler a few turns while manually preventing the belt from falling off the
sheave (Fig. 19). This should center the belt on the tumbler and prevent the belt from being thrown off later.
Replace all dryer panels.
FIG . 18
FIG . 19
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ADC Part No. 450261 2 - 09/15/05 - 1
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