American Dryer Corp. SL75 Manual

Service Procedures
for the
Model SL31,50,75 Dryer
Hot Surface Ignitor Gas
Part No. 450279-2
American Dryer Corporation
88 Currant Road
Fall River MA 02720-4781 USA
Telephone: [phone] / Fax: [phone]
e-mail: [e-mail]
www.amdry.com

“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.
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.
IMPORTANT
For your convenience, log the following information:
DATE OF PURCHASE ______________________________________________ MODEL NO. ____________________________
DISTRIBUTOR’S NAME ___________________________________________________________________________________
SERIAL NUMBER(S) ______________________________________________________________________________________
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
For replacement parts, contact the distributor from which the dryer was purchased or contact:
American Dryer Corporation
88 Currant Road
Fall River MA 02720-4781 USA
Telephone: [phone] / Fax: [phone]
e-mail: [e-mail]
www.amdry.com
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.
SL31,50,75
FOR YOUR SAFETY
Do not store or use gasoline
or other flammable vapors
and liquids in the vicinity of
this or any other appliance.
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.

Table of Contents
Part Locations and Removal ................ 4
Lower Front Panel Removal ......................................... 4
Upper Front Panel Removal ......................................... 4
Top Cover Removal ....................................................... 4
Lint Box/Blower Assembly Removal ............................. 4
Gas Valve/Ignition System Removal ............................. 5
Gas Valve/Ignition System Components ...................... 6
Oven Housing Components .......................................... 6
Tumbler Support
Wheel Assembly Replacement .................................... 6
Tumbler Alignment ....................................................... 7
Belt Replacement ........................................................ 8
Placing the Belt ........................................................... 8
SL31Belt Replacement ................................................ 9
Placing the Belt ........................................................... 9
Electrical Component Locations........10
Electrical Panel ......................................................... 10
Sail Switch and Axial Probe Assembly ...................... 10
Exhaust Probe, Exhaust Hi-limit,
and Lint Drawer Switch ............................................... 11
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.
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. Toute 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.
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 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.

4 American Dryer Corporation 450279-2
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.
Unplug two connections on the exhaust hi-limit at
the left of the lint box. Also disconnect the two
connections for the lint drawer switch, located at the
back of the lint box. The lint box may now be pulled
out through the front of the dryer.
Unplug the motor harness.
For SL31, remove two screws above the lint drawer.
For SL50,75, also remove two screws beneath the
gasket on the left and right side of the lint drawer.
Also, unplug the exhaust temperature probe.
LINT BOX/BLOWER ASSEMBLY REMOVAL:
TOP COVER REMOVAL:
First remove the back guard, the four screws holding
top cover. Next pull top cover toward the rear of the
dryer and lift up.
Tilt the bottom of the panel out and lift the panel up.
Align support rod into hole to support control panel.
Disconnect the electrical connections. Remove
screw from hinge to remove the control panel.
LINT DRAWER
SWITCH
EXHAUST
HI-LIMIT
For Models SL31,50,75
For Models SL31,50,75
For Models SL31,50,75
SUPPORT
ROD
DOOR
SWITCH
UPPER FRONT PANEL REMOVAL:
Remove the four screws located just above the top
loading door. Tilt the bottom of the panel out and lift
the panel up and away from the dryer.
For Models SL31,50,75

450279- 2 www.amdry.com 5
GAS VALVE/IGNITION SYSTEM REMOVAL:
Be sure to shut off the gas main and then proceed
to remove electrical connections and screws
indicated. Remove lower front panel. Disconnect
union and screws noted with arrows.
By removing the top screws you will be able to
remove the burner tube. After, removing the top
burner, without damaging the Hot Surface Ignitor,
remove the whole gas valve assembly. Be careful
during assembly not to damage the Hot Surface
Ignitor. Replace assembly in the reverse order.
Inspect all wires to be sure all lead directly toward
the front of the dryer. Be sure no wires are caught
on the burner tube or ignitor.
To remove motorized impellor assembly:
Remove the six hex nuts shown with arrows. Now
pull the blower motor assembly apart from the blower
housing. Remove the four Phillips screws shown
with arrows and separate the motorized impellor
from the blower motor mount.
To remove motorized impellor assembly, remove lint
housing cover, lint screen, and the four screws
shown with arrows. Pull the motorized impellor
assembly out through the opening.
For Models SL31,50,75
For Models SL31,50,75
Gas Valve Ingnition System

6 American Dryer Corporation 450279-2
OVEN HOUSING COMPONENTS:
GAS VALVE/IGNITION SYSTEM COMPONENTS:
BURNER TUBE
IGNITOR
GAS VALVE
For Models SL31,50,75
OVEN CHAMBER
RADIANT
SENSORS
HOT SURFACE
IGNITOR
Dual Burner SL50,75
RADIANT SENSOR
BURNER HIGH-LIMIT
GAS VALVE
HOT SURFACE
IGNITOR
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 below is provided to show
the location of these wheels as the wheels cannot
easily be seen while standing in front of the dryer.
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.
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. Be sure to mark the position of rear wheel
brackets prior to removal (refer to photo right).
For Models SL50,75
For Models SL31

450279- 2 www.amdry.com 7
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 by equalizing the gap
on the top, bottom, left and right by moving the wheel
assemblies.
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 front to bulkhead may be checked for accuracy
by using a thickness gauge. The rear gap is not
accessible. Marking the position of the rear wheel
brackets before removing the brackets will help in
replacing the tumbler back into it’s original position
when the wheel brackets are reinstalled.
Below, both wheel assemblies are adjusted correct
and spacing is even on all sides.
EXAMPLES:
In the illustrations to the right, 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.

8 American Dryer Corporation 450279-2
BELT REPLACEMENT:
Shut off electrical power to the dryer. Lockout and
tag out supply voltages. Follow the steps to remove
front middle panel. Next you will remove either the
front bottom or front upper panel, depending on
pocket you are working on. Remove the belt from
the motor sheave. Next, remove the two screws
fastening the lint coupe to the front panel. Remove
the front panel screws, while holding up the
basket. Tilt the top of the front panel forward. Take
note of position of motor adjustment nut. Spin
counterclockwise to loosen tension. The old belt
can now be removed. Slide the new belt around
basket and push belt to a position close the motor
sheave.
PLACING THE BELT:
Now that the belt is close to the motor sheave (Fig.1),
make sure the motor pivot is at it’s highest point.
Wrap the belt under the motor sheave (Fig.2), then
push the belt over the idler wheel (Fig.3). Once this
has been accomplished make sure to spin the
basket by hand to self align the belt on motor sheave
and idler wheel. Tighten the motor adjustment nut
to position previous set.
FIG. 1
FIG. 2
FIG. 3

450279- 2 www.amdry.com 9
SL31 BELT REPLACEMENT:
Shut off electrical power to the dryer. Lockout and
tag out supply voltages. Follow the steps to remove
front middle panel. Next you will remove either the
front bottom or front upper panel, depending on
pocket you are working on. Remove the belt from
the motor sheave. Next, remove the two screws
fastening the lint coupe to the front panel. Remove
the front panel screws, while holding up the
basket. Tilt the top of the front panel forward. Take
note of position of motor adjustment nut spin
counterclockwise to loosen tension. The old belt
can now be removed. Slide the new belt around
basket and push belt to a position close the motor
sheave.
PLACING THE BELT
BACK ON THE MOTOR SHEAVE:
Place belt installation tool (BIT-P/N 320650) over belt
(Fig. 1) and rotate in a clockwise direction. While
rotating run BIT under motor sheave (Fig. 2).
Continue to spin BIT, belt will then wrap under motor
sheave (Fig. 3). Remove BIT from dryer (Fig. 4).
Next, you want to rotate basket slowly to ensure it is
on the sheave completely. Tighten the motor
adjustment nut to position previous set.
FIG. 1
FIG. 4
FIG. 2
FIG. 3

10 American Dryer Corporation 450279-2
Electrical Component Locations
SAIL SWITCH AND AXIAL PROBE ASSEMBLY:
Located behind back guard. Access doors are
provided. Back guard does not have to be removed.
ELECTRICAL PANEL:
The electrical panel is located behind the front middle
panel.
For Models SL31
For Models SL50,75
DOOR
SWITCH
COMPUTER
PANEL
COVER
ROTATIONAL
SENSOR
SWITCH
REVERSING
RELAY
COMPUTER
COVER
DOOR SWITCH
For Models SL50,75
For Models SL31
AXIAL
PROBE
SAIL
SWITCH
BURNER
HIGH LIMIT
AXIAL
PROBE
SAIL
SWITCH