American Dryer AD-35i User manual

AD-35i / AD50i / AD80i
Service Manual
American Dryer Corporation
88 Currant Road
Fall River MA 02720-4781 USA
Telephone: [phone] / Fax: [phone]
e-mail: [e-mail]
www.adclaundry.com
ADC Part No. 450336-1

2 American Dryer Corporation 450336-1
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.
Wehavetriedtomakethismanualascompleteaspossible and hope you will find ituseful. Themanufacturer
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. _________________
RESELLER’S NAME _________________________________________________________________________________
SERIAL NUMBER(S) _________________________________________________________________________________
___________________________________________________________________________________________________
___________________________________________________________________________________________________
Replacement parts can be obtained from your reseller or theADC factory. When ordering replacement parts from the
factory, youcanFAX yourorder toADCat(508) 678-9447or telephoneyour orderdirectly totheADCPartsDepartment
at [phone]. 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.
The illustrations on the following pages may not depict your particular dryer exactly. The illustrations are a composite
of the various dryer models. Be sure to check the descriptions of the parts thoroughly before ordering.
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.
“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
instructionsmust be posted in a prominent location nearthedryer.

450336-1 www.adclaundry.com 3
Important Information ........................................................ 4
Safety Precautions ................................................................. 4
Routine Maintenance ......................................................... 4
Cleaning .................................................................................. 4
Adjustments ............................................................................ 5
Lubrication .............................................................................. 5
Installation Requirements ................................................. 5
Enclosure, Air Supply, and Exhaust Requirements ............... 5
Electrical and Gas Requirements .......................................... 5
Operational Service Check Procedure .................................. 6
Description of Parts ........................................................... 6
Control Panel (Microprocessor) ............................................. 6
Control Box (Computer Controls)........................................... 6
Main Door Switch ................................................................... 6
Lint Door Switch ..................................................................... 7
Lint Coop................................................................................. 7
Tumbler ................................................................................... 7
Tumbler Bearing ..................................................................... 7
Drive Motor and Blower Motor ............................................... 8
Temperature Sensor (Computer Controls) ............................ 8
Gas Burner.............................................................................. 8
Variable Speed Drive .............................................................. 8
Sail Switch .............................................................................. 9
Rear Electrical Panel.............................................................. 9
Servicing.............................................................................. 9
Burner Controls (Gas) .......................................................... 10
Front Panel and Main Door Assemblies .............................. 12
Drive Pulley........................................................................... 14
Motor ..................................................................................... 14
Lint Drawer Screen............................................................... 15
Front Support Rollers ........................................................... 15
Troubleshooting ............................................................... 15
Phase 7 Non-Coin Microprocessor Controller
(Computer) System Diagnostics .......................................... 15
Diagnostic (L.E.D. Display) Fault Messages ....................... 15
S.A.F.E. System Diagnostic Conditions ............................... 17
I/O Board L.E.D. ................................................................... 18
Data Label Information .................................................... 23
Data Label............................................................................. 23
Using A Manometer .............................................................. 23
Keypad Layout ...................................................................... 24
S.A.F.E. System Theory Of Operation ................................. 24
Static Pressure ..................................................................... 25
Using a Magnehelic .............................................................. 25
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 standards.
Pleaseobserve all safetyprecautionsdisplayed
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. Touteerreurdecâblagepeutétre
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 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.
Table of Contents _____________________
List of Acronyms _____________________________
DSI Direct Spark Ignition
in WC Inches of Water Column
I/O Input/Output
L.E.D. Light Emitting Diode
L.P. Liquid Propane
OSHA Occupational Safety and Health Administration
S.A.F.E. Sensor Activated Fire Extinguishing

4 American Dryer Corporation 450336-1
Routine Maintenance _________________
Cleaning
A program and/or schedule should be established for periodic
inspection, cleaning, and removal of lint from various areas of
the dryer, as well as throughout the ductwork system. The
frequency of cleaning can best be determined from experience
at each location. Maximum operating efficiency is dependent
uponproper air circulation. The accumulation oflintcan restrict
this airflow. If the guidelines in this section are met, an ADC
dryerwill provide many years of efficient,trouble free, and most
importantly safe operation.
!WARNING
Lint from most fabrics is highly combustible. The
accumulation of lint can create a potential fire hazard.
IMPORTANT: Dryer produces combustible lint and must be
exhausted to the outdoors. Every 6 months, inspect the
exhaust ducting and remove any lint build up.
Suggested Cleaning Schedule
Daily
Clean lint from the lint screen. Inspect and replace if torn.
90 Days
Remove lint accumulation from lint chamber thermostats and
sensors. Removelint from the motor air ventsandsurrounding
area.
!WARNING
TO AVOID THE HAZARD OF ELECTRICAL SHOCK,
DISCONTINUE ELECTRICAL SUPPLY TO THE DRYER.
IMPORTANT: Lint accumulation will restrict internal motor
airflow, causing overheating and irreparable motor damage.
Motor failure due to lint accumulation will VOID THE
WARRANTY.
120 Days
Remove lint from gas burner area with a dusting brush or
vacuum cleaner attachment.
6 Months
Inspectand remove lint accumulationinthe customer furnished
exhaust ductwork system. Inspect exhaust draft dampers to
ensure they are not binding. Inspect and remove all lint
accumulation from in and around control box area including
coin acceptors. Clean lint accumulation from around tumbler
wrapper area.
IMPORTANT: THE ACCUMULATION OF LINT IN THE
EXHAUST DUCTWORK CAN CREATE A POTENTIAL FIRE
HAZARD.
As Required
In the cleaning and care of the cabinet, avoid using harsh
abrasives. Aproduct intended for the cleaning of appliances is
recommended.
Important Information ________________
Safety Precautions
1. Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any appliance.
2. Purchaser and user should consult the local gas supplier
for proper instructions to be followed in the event the user
smells gas. The instructions should be posted in a
prominent location.
3. Dryers must be exhausted to the outdoors.
4. Although ADC produces a very versatile dryer, there are
some articles that, due to fabric composition or cleaning
method, should not be dried in it.
!WARNING
Dry only water washed fabrics. Do not dry articles
spotted or washed in dry cleaning solvents, a
combustible detergent or “all purpose” cleaners.
EXPLOSION COULD RESULT.
Do not dry rags or articles coated or contaminated
with gasoline, kerosene, oil, paint, or wax.
EXPLOSION COULD RESULT.
Do not dry mop heads. Contamination by wax or
flammable solvents will create a fire hazard.
Do not use heat for drying articles that contain plastic,
foam, sponge rubber, or similarly textured rubber
materials. Drying in a heated tumbler may damage
plastics or rubber and may be a fire hazard.
5. A program should be established for the inspection and
cleaning of the lint in the burner area and exhaust
ductwork. The frequency of inspection and cleaning can
best be determined from experience at each location.
!WARNING
THE COLLECTION OF LINT IN THE BURNER/OVEN
AREA AND EXHAUST DUCTWORK CAN CREATE A
POTENTIAL FIRE HAZARD.
6. For personal safety, the dryer must be electrically
grounded in accordance with local codes and/or the
National Electrical Code ANSI/NFPA NO. 70-LATEST
EDITION or in Canada, the Canadian Electrical Codes
Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION.
7. Under no circumstances should the dryer door switch or
heat circuit safety devices ever be disabled.
!WARNING
PERSONAL INJURY OR FIRE COULD RESULT.
8. READ AND FOLLOW all CAUTION AND DIRECTION
LABELS ATTACHED TO THE DRYER.
!WARNING
Children should not be allowed to play on or near the
dryer(s). Children should be supervised if near
dryer(s) in operation.

450336-1 www.adclaundry.com 5
Adjustments
7 Days After Installation and Every 6 Months Thereafter
Inspectbolts, nuts,screws (bearing setscrews),nonpermanent
gas connections, and grounding connections (unions, shutoff
valves,and orifices). Motorand drive beltsshouldbe examined.
Cracked or seriously frayed belts should be replaced. Tighten
loose belts when necessary, and check belt alignment.
Complete operational check of controls and valves. Complete
operational check of all safety devices (door switches, sail
switch, burner and lint chamber thermostats).
Lubrication
The motor bearings, idler bearings and tumbler bearings are
permanently lubricated, and no lubrication is necessary.
Installation Requirements ____________
Installation should be performed by competent technicians in
accordancewith local and statecodes. In the absence of these
codes, the installation must conform to applicable American
National Standards: ANSI Z223.1-LATEST EDITION (National
Fuel Gas Code) or ANSI/NFPA NO. 70-LATEST EDITION
(National Electrical Code) or in Canada, the installation must
conformto applicable Canadian Standards:CAN/CGA-B149.1-
M91 (Natural Gas) or CAN/CGA-B149.2-M91 (L.P. Gas) or
LATEST EDITION (for General Installation and Gas Plumbing)
or Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or
LATEST EDITION (for Electrical Connections).
Enclosure, Air Supply,
and Exhaust Requirements
NOTE: The following information is very brief and general.
For a detailed description refer to the installation booklet for
non-coin dryers.
Bulkheads and partitions around the dryer should be made of
noncombustible materials. Allowances should be made for the
opening and closing of the control door and lint door. Also,
allowancesshould bemadein therearfor easeof maintenance.
(Refer to installation manual for recommended distances and
minimum allowances required.)
Whenthe dryeris operating,itdraws inroom air,heatsit, passes
the air through the tumbler, and exhausts it out the building.
Therefore, the room air must be continually replenished from
the outdoors. If the make-up air is inadequate, drying time and
drying efficiency will be adversely affected. Ignition problems
and sail switch “fluttering” problems on gas dryers may result,
and you also could have premature motor failure from
overheating. On electric dryers, premature electric element
failure may result. Air supply must be given careful
consideration to ensure proper performance of each dryer.
IMPORTANT: Make-up air must be provided from a source
free of dry cleaning solvent fumes. Make-up air that is
contaminated by dry cleaning solvent fumes will result in
irreparable damage to the motors and other dryer
components.
Exhaust ductwork should be designed and installed by a
qualified professional. Improperly sized ductwork will create
excessive back pressure, which will result in slow drying,
increased use of energy, and shutdown of the burner by the
airflow (sail) switch.
CAUTION: IMPROPERLY SIZED OR INSTALLED OR
MAINTAINED (CLEANED) EXHAUST DUCTWORK CAN
CREATE A POTENTIAL FIRE HAZARD.
Electrical and Gas Requirements
Electrical Requirements
It is your responsibility to have all electrical connections made
by a properly licensed and competent electrician to assure that
the electrical installation is adequate and conforms to local and
state regulations or codes. In the absence of such codes, all
electrical connections, materials, and workmanship must
conformto theapplicable requirementsof theNational Electrical
CodeANSI/NFPANO. 70-LATEST EDITION or in Canada, the
Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or
LATEST EDITION.
IMPORTANT: Failure to comply with these codes or
ordinances, and the requirements stipulated in this manual,
can result in personal injury or component failure.
It is your responsibility to have all plumbing connections made
by a qualified professional to assure that the gas plumbing
installation is adequate and conforms to local and state
regulations or codes. In the absence of such codes, all
plumbing connections, materials, and workmanship must
conform to the applicable requirements of the National Fuel
Gas Code ANSI Z223.1-LATEST EDITION, or in Canada, the
Canadian Installation Codes CAN/CGA-B149.1-M91 (Natural
Gas)orCAN/CGA-B149.2-M91(L.P.Gas) orLATESTEDITION.
Gas Supply
The gas dryer installation must meet the American National
Standard...National Fuel Gas Code ANSI Z223.1-LATEST
EDITION, or in Canada, the Canadian Installation Codes CAN/
CGA-B149.1M91 (NaturalGas) orCAN/CGA-B149.2-M91 (L.P.
Gas) or LATEST EDITION, as well as local codes and
ordinances and must be done by a qualified professional.
NOTE: Undersized gas piping will result in ignition problems
and slow drying and can create a safety hazard.
The dryer must be connected to the type of gas (natural or
L.P.) indicated on the dryer data label. If this information does
not agree with the type of gas available, do not operate the
dryer. Contact the dealer who sold the dryer or contact ADC.
The gas input ratings shown on the dryer data label are for
elevations up to 2,000 feet (609.6 meters), unless elevation
requirements of over 2,000 feet (609.6 meters) were specified
at the time the dryer order was placed with the factory. The
adjustment for dryers in the field for elevations over 2,000 feet
(609.6 meters) are made by changing the burner orifices. If
this adjustment is necessary, contact the dealer who sold you
the dryer or contactADC.
NOTE: Any burner changes must be made by a qualified
technician.

6 American Dryer Corporation 450336-1
Operational Service Check Procedure
After performing any service or maintenance function, an
operational check should be performed to ensure that all
components are performing properly.
1. Make a complete operational check of all the operating
controls to assure that the timing is correct, temperature
selection switches are functioning, etc.
2. Make a complete operational check of all safety related
circuits, door switch(es), hi-limit thermostat, sail switch,
cycling thermostats, etc.
3. On gas models, gas pressure test should be taken at the
gas valve pressure tap of each dryer to assure that the
water column pressure is correct and consistent.
NOTE: Water column pressure requirements (measured at
the gas valve pressure tap):
Natural Gas_______ 3.5 in WC (8.7 mb)
L.P. Gas _________ 10.5 in WC (26.1 mb)
4. The dryer should be operated through one (1) complete
cycle to assure that no future adjustments are necessary
and that all components are functioning properly.
5. For 3-phase (3ø) motor models, check the electric service
phase sequence while the dryer is operating. Check to
see if the blower wheel is rotating in the proper direction.
Looking from the front, the blower wheel should spin in
the clockwise direction. If so, the phasing is correct. If
the phasing is incorrect, reverse two (2) leads at
connections L1, L2, L3 of power supply to the dryer.
Description of Parts ___________________
Control Panel (Microprocessor)
Opening the control panel will allow access to the computer
board. The keypad inputs to the computer what temperature
and program has been selected. The computer controls the
entireoperation of thedryer. Itaccepts inputsandgives outputs
to various parts throughout the dryer.
Main Door Switch
The main door switch is located behind the main door on the
right hand side. When the main door is opened, the switch will
also open, preventing the dryer from operating. The main door
switch is a safety device and should never be disabled.
Control Box (Computer Controls)
The computer control box is made up of several computer
harnesses. Theseharnesses provide inputandoutput voltages
to various devices throughout the dryer.

450336-1 www.adclaundry.com 7
Lint Door Switch
The lint door switch is located in the lint compartment at the
top right corner. The lint door switch ensures that the dryer will
operate only when the lint door is completely closed. This is a
safety device and should never be disabled.
Tumbler
The tumbler consists of four (4) ribs, a shaft and a front and
rearfelt seal. The feltsealsare used tokeepthe tumbler sealed
to the front and rear panels. There are also tie rods, which run
under each rib and secure the basket to the shaft.
Lint Coop
The lint coop is the bottom portion of the dryer behind the lint
door. Inside the lint coop is the lint screen which prevents lint
from entering the exhaust system. The lint screen should be
kept clean at all times. The lint screens should be cleaned on
a daily basis. Lint screens with tears or holes should be
replaced immediately.
Tumbler Bearing
The tumbler bearing is located (viewing from the rear of the
dryer) approximately at the upper center of the dryer. The
arrangement consists of a pulley, bearing platform, c-clip, and
bearing, which serve to adjust, drive, and support the tumbler.
NOTES ______________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________

8 American Dryer Corporation 450336-1
BLOWER MOTOR
Temperature Sensor (Computer Controls)
The temperature sensor used, is a transducer that converts
heat into microamps that the computer board then uses to
calculate the temperature.
Drive Motor and Blower Motor
The drive motor is located at the back, lower left side of the
dryer. It sits on an adjustable base, so that the motor can be
easily adjusted up or down. The blower motor is connected to
the impellor, a backward curved paddle wheel. The impellor
provides airflow in the dryer. It creates a vacuum, which pulls
the hot air from the burner into the tumbler through the lint
screen and out the exhaust.
DRIVE MOTOR
Gas Burner
Gas dryers are equipped with a gas burner located behind the
control door. The gas burner assembly consists of the burner
tube, orifice (the orifices have a hole in them to allow gas to
flow through. The hole size varies with different elevations,
and different Btu), gas valve (which can be set up for natural
gas or L.P. gas), spark ignitor, and flame probe.
Variable Speed Drive
Thedryer isequippedwith avariablespeed drivefor the tumbler
motor. The variable speed drive unit is located at the back of
the machine just below the rear electrical panel. The variable
speed drive has a temperature sensor, which monitors the
temperature of the load and adjusts the speed of the motor to
improve drying efficiency.

450336-1 www.adclaundry.com 9
Sail Switch
The sail switch consists of a round damper plate on a lever
arm, which acts like an actuator for a microswitch. When the
air blower comes on, it draws air through the burner. This
creates a negative pressure inside the burner box, and this
negative pressure pulls in the round damper, which activates
the sail switch. If there is improper airflow, the damper will not
pull in, preventing the burner from coming on. Improper airflow
can be caused by improperly designed exhaust ducting, where
the duct run is too long or has too many sharp bends on it. It
can also be caused by a lack of make-up air. The sail switch is
located in the back of the dryer beside the burner inlet to the
tumbler.
Rear Electrical Panel
This panel is located in the back of the dryer at the upper left
handcorner. Mountedon this panelarethe forward andreverse
relays and blower contactor. The transformer steps down the
incoming voltage to 24 VAC, to supply voltage to the computer
and controls. There is also a fuse or fuses that protect the
transformer and control circuits.
Servicing _______________________________
IMPORTANT: YOU MUST DISCONNECT AND LOCKOUT
THE ELECTRIC SUPPLY AND THE GAS 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 STANDARDS.
!WARNING
Personal injury could result.
The information provided in this section should not be
misconstrued as a device for use by untrained persons making
repairs. Service work should be performed by competent
technicians in accordance with local, state, and federal codes.
When contacting the factory for assistance, always have the
dryer model number and serial number available.
CAUTION: Observe all safety precautions displayed
on the dryer or specified in this manual before and
while making repairs.
Beforeconsidering replacement, make sure that all connectors
are in place and making proper contact. Check input voltages
and temperature sensor. After replacing any parts, or
performing adjustments or service, run through a complete
cycle.
TO REPLACE COMPUTER
1. Discontinue power to the dryer.
2. Open control door.
3. Disconnect the J3, J4, J5, J6, and J8 harnesses from the
rear of the computer by squeezing the top locking tab and
pulling the connector straight back.
4. Disconnectthegreengroundwireandthepurplewirefrom
the computer.
5. Disconnect the keypad ribbon from the computer.
6. Remove the two (2) screws securing the computer to the
control panel and remove computer from the panel, by
pulling upwards on the corners.
7. Install the new computer by reversing this procedure.
8. Be sure to check or reset programs.
NOTE: Use caution when handling microprocessor
controller. It can be easily damaged by static electricity.

10 American Dryer Corporation 450336-1
TO REPLACE KEYPAD (Refer to illustration above)
1. Discontinue power to the dryer.
2. Open the control door and unplug keypad ribbon from the
computer board.
3. Peel the keypad from the front of the control door, taking
care to avoid scratching the panel.
4. Clean any adhesive residue from the panel.
5. Peel off paper backing from new keypad.
6. Align the display window on the keypad, with the cutout in
the control door and press in place.
7. Connect keypad ribbon to the board, close control door,
and reconnect power to the dryer.
8. Test for operation by pressing each selection (A through
F).
TO REPLACE COMPUTER
TEMPERATURE SENSOR PROBES
1. Discontinue power to the dryer.
2. Open lint door to gain access to sensors.
3. Remove the screws holding the sensor in place.
4. Disconnect sensor bracket harness connector.
5. Disassemble the sensor probe from the bracket assembly
by removing the top push on fastener securing the probe
to the bracket. Use a small screwdriver to slowly pry the
fastener off.
6. Install new sensor probe assembly by reversing the
procedure.
7. Reestablish power to dryer.
NOTE: If, when power is reestablished the computer
display reads “exhaust probe fault”, check for loose
connection on the wiring.
TO REPLACE BLOWER MOTOR CONTACTOR, 24 VAC
1. Discontinue power to the dryer.
2. Remove all wires from contactor (NOTE: make sure each
wire is marked with location removed from).
3. Press down firmly on the contactor and shift towards the
right, then pull contactor out.
4. Install the new contactor in reverse procedure.
5. Reestablish power to the dryer.
Burner Controls (Gas)
This illustration is typical of all gas burners, but they are not all
exactlyalike. Yourparticularmodel mayhave some differences.