American Dryer AD-120i User manual

AD-120i
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. 450371-1

2 American Dryer Corporation 450371-1
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.
AD-120i

450371-1 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 450371-1
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.

450371-1 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 and the tumbler bearing 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 450371-1
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.

450371-1 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 rear felt
seal. The felt seal is used to keep the tumbler sealed to the
rear panel. 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 450371-1
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
tubes, orifices (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.

450371-1 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 450371-1
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.

450371-1 www.adclaundry.com 11
TO REPLACE SPARK IGNITOR
1. Discontinue power to the dryer.
2. Disconnect high voltage connector from DSI module.
3. Disassemble ignitor from burner by removing the self-
tapping screw.
4. Reverse procedure for installing the new ignitor probe.
NOTE: Before reestablishing power to the dryer, visually
check the following: (refer to the illustration).
5. There should be a 1/8” gap (+/- 1/32) between the ignitor
probe and the burner tube.
6. Do not wrap the red high voltage wire and flame-probe
wire together. (Improper operation may result.) They may
run along side each other.
7. Check to see that spark occurs on the open end of the
burnertube and not the closed side. If this happens, adjust
ignitor farther from the side of the tube.
TO REPLACE GAS VALVE
1. Discontinue power to the dryer.
2. Close shutoff valve in the gas supply line.
3. Disconnect the gas valve wiring.
4. Break union connection before gas valve.
5. Loosen and remove two (2) screws securing pipe bracket
to the burner.
6. Remove gas valve/manifold assembly from the dryer.
7. Remove manifold from outlet of the gas valve.
8. Remove piping from valve.
9. Reverse procedure for installing the new gas valve.
!WARNING
Test all connections for leaks by brushing on a soapy
water solution (liquid detergent works well).
NEVER TEST FOR LEAKS WITH A FLAME!!!
TO REPLACE MAIN BURNER ORIFICE
1. Refer to “TO REPLACE GAS VALVE” and follow Step #1
through #6.
2. Unscrew main burner orifice and replace.
NOTE: Use extreme care when removing and replacing
orifices. THESE ORIFICES ARE MADE OF BRASS,
WHICH IS EASILY DAMAGED.
3. Reverse the removal procedure for reinstalling.
!WARNING
Test all connections for leaks by brushing on a soapy
water solution (liquid detergent works well).
NEVER TEST FOR LEAKS WITH A FLAME!!!
TO TEST AND ADJUST GAS
(WATER COLUMN) PRESSURE
There are two (2) types of devices commonly used to measure
water column pressure. They are spring/mechanical type
gauges and manometers. The spring/mechanical type gauge
is not recommended because it is easily damaged and not
alwaysaccurate. Amanometeris simply a glass or transparent
plastic tube with a scale in inches, which when filled with water
and pressure is applied, the water in the tube rises, showing
the exact water column pressure.
NOTE: Manometers are available from the factory by
ordering Part No. 122804.
1. To test gas water column pressure.
Connect water column test gauge connection to gas valve
pressure tap (1/8” N.P.T). This pressure tap is located on
the outlet (downstream) side of the valve.
Start the dryer. With burner on, the correct water column
reading in inches would be:
Natural Gas ___ 3.5 in WC (8.7 mb)
L.P.Gas ______ 10.5 in WC (26.1 mb)
2. To adjust water column pressure for natural gas models,
remove vent cap. Turn the slotted adjustment screw
located on top of the valve next to the terminals. Turn
clockwise to increase manifold pressure and
counterclockwise to decrease. For L.P. gas models there
is no regulator on valve.
NOTE: If correct water column pressure cannot be
achieved, problem may be due to an undersized gas supply
line, a faulty or underrated gas meter, etc.

12 American Dryer Corporation 450371-1
TO ADJUST SAIL SWITCH
1. Operate the installed dryer normally to verify that the heat
system is fully operational.
2. Open the main dryer door.
3. Manually depress the door switch actuator.
4. While continuing to depress the door switch actuator, and
with the door open, start the dryer.
5. If the heat system is not activated in 15-seconds, the sail
switch is properly adjusted.
6. If the heat system is activated, the sail switch is improperly
adjusted and must be readjusted by bending the actuator
arm of the sail switch toward the front of the dryer. If the
actuator arm is bent too far toward the front of the dryer,
the dryer may not have heat when needed. After any
adjustments of the sail switch, the above procedure must
be repeated to verify proper operation.
CAUTION: Do not disable this switch by taping or
screwing sail switch damper to burner. Personal
injury or fire could result.
Front Panel and Main Door Assemblies
TO REPLACE MAIN DOOR SWITCH
1. Discontinue power to the dryer.
2. Open the main door.
3. Remove the two (2) Phillips head screws holding the main
door switch cover in place.
4. Remove the two (2) nuts and washers securing the switch
to the door hinge, and take the switch off the two (2) clinch
studs on the hinge.
5. Disconnect the two (2) wires on the door switch. Connect
the new door switch to those two (2) wires.
6. Reverse this procedure for installing the new door switch.
IMPORTANT: Under no circumstances should the door
switch be disabled.
TO REPLACE SAIL SWITCH
1. Discontinue power to the dryer.
2. Disconnect the two (2) wires from the switch.
3. Disassemble sail switch from mounting bracket by
removing the two (2) screws securing the switch in place.
4. Reverse this procedure for installing the new sail switch.
Adjust sail switch as described in the next section.
TO REPLACE DSI MODULE
1. Discontinue power to the dryer.
2. Remove the wires connected to the terminal strip at the
top of the module, and wires connected on the side of the
module.
3. Remove the high voltage wire from the module.
4. Remove the two (2) hex nuts securing the module to the
module mounting bracket.
5. Replace module by reversing process.

450371-1 www.adclaundry.com 13
4. Remove the screws securing the front panel to the dryer
at the top and bottom of the panel.
5. Gently remove the top right hand corner of the front panel
assembly from the dryer.
6. Disconnectthemaindoor switch harness at the connector.
IMPORTANT: When removing front panel assembly, be
careful not to damage main door switch wires disconnected
in Step #2.
7. Reverse this procedure for installing the new front panel.
TO REPLACE TUMBLER PULLEY
1. Loosen belt, then rotate pulley and roll belt out of the
grooves.
2. Remove cap screws securing taper lock hub to pulley.
3. Insert cap screws in tapped removal holes and tighten
evenly until bushing becomes loose in pulley. See figure
“A”.
4. Remove bushing, pulley, and key.
5. Assemble bushing and pulley as shown in figure “B”.
When cap screws are loosely inserted, bushing remains
fully expanded to provide a sliding fit to the shaft.
6. Insertkey on the shaft, then slide pulley to desired position
with cap screw heads to the outside.
7. Tighten cap screws progressively. There remains a gap
between the pulley hub and the flange of the bushing.
IMPORTANT: Tighten screws evenly and progressively.
Never allow the pulley to be in contact with the flange of the
bearing. This gap should measure from 1/8” to 1/4”.
Proper cap screw torque is 30 ft-lb (40.67 Nm), if greater
tightening forces are applied, excess pressure will be
created in the hub of the mounted pulley, which may cause
it to crack.
TO REPLACE THE TUMBLER BEARING
1. Remove the tumbler pulley (follow tumbler pulley removal
procedure).
2. Remove the four (4) boltssecuring the bearing to the plate.
3. LoosenAllen setscrews securing bearing to the shaft and
remove C-clip from shaft.
4. Pull bearing off of shaft using a gear puller, if necessary.
NOTE: If any rust has developed, use an emery cloth to
polish the shaft.
5. Reverse procedure for installing the new tumbler bearing.
TO REPLACE MAIN DOOR ASSEMBLY
1. Remove screws holding main door upper hinge block.
2. Lift and remove door off of lower hinge block.
3. Reverse this procedure for reinstalling the new main door
assembly.
TO INSTALL NEW MAIN DOOR GLASS
1. Remove main door assembly from the dryer (follow main
door removal procedure).
2. Lay main door on a flat surface with front of door face
down.
3. Remove glass and clean all old sealant off main door.
This area must be completely cleaned for correct bonding.
4. Apply narrow bead of silicone all around main door area
where glass will rest.
5. Install glass onto door/adhesive and slightly press glass
in place.
IMPORTANT: Do not press hard or silicone thickness
between the glass and door will be reduced resulting in
poor bonding.
6. The door assembly should now be put in an area where it
will not be disturbed for at least 24 hours. Depending on
the conditions, the curing time of the adhesive is 24 to 36
hours.
7. After 24 hour curing period, install main door on dryer by
reversing Step #1.
TO REPLACE FRONT PANEL
1. Discontinue power to the dryer.
2. Follow procedure for removal of main door assembly.
3. Open control (service) door and lint door.

14 American Dryer Corporation 450371-1
NOTE: If rust has developed on the shaft, use an emery
cloth to polish the shaft.
4. Reverse procedure for installing the new drive pulley.
NOTE: Check tension and alignment of belt before
operating the dryer.
TO REPLACE THE TUMBLER
AND/OR TUMBLER SUPPORT
1. Discontinue power to the dryer.
2. Remove the tumbler pulley.
3. Remove the front panel assembly.
4. Loosen setscrews on rear tumbler bearing and remove
C-clip.
5. Using a wheelpuller,gently push the tumbler shafttowards
the front through the tumbler bearing.
Drive Pulley
(Remove back guard to access assembly)
1. Remove the back guard.
2. Loosen belt then rotate pulley and roll belt out of the
grooves.
3. Loosen setscrews and pull motor pulley out.
NOTE: Tighten bearing Allen screw from 80- to 90-inch
pounds. Check alignment of pulleys before operating the
dryer.
NOTE: An alternate method would be to place a block of
wood on the end of the tumbler shaft and strike it with a
heavy hammer. To prevent damage to the shaft, the wheel
puller method is preferred.
6. Remove the tumbler and support through the front of the
dryer.
Remove the bolt in the center of the tumbler back wall.
Loosenand remove the nuts andwashersfrom the tumbler
tie rods. Remove the rods.
7. After replacing either tumbler or tumbler support
reassemble components into dryer by reversing Steps #1
through #4.
8. Check belt tension and alignment.
9. Replace the backguardand reestablish power to thedryer.
Motor
TO REPLACE DRIVE MOTOR
1. Discontinue power to the dryer.
2. Remove the drive belt.
3. Disconnect wiring harness from the motor.
4. Remove nuts and washers holding the motor mount to
the rear of the dryer and pull motor mount away.
5. Remove the bolts holding the motor to the motor mount
and replace it with a new motor.
6. Remove pulley from the old motor and install on the new
motor.
7. Replace motor mount to the dryer.
8. Align and tension belt.
TO REPLACE BLOWER MOTOR
1. Discontinue power to the dryer.
2. Disconnect wiring harness from the motor.
3. Remove nuts and washers holding the motor mount to
the rear of the dryer and pull motor mount away.
4. Remove the bolts holding the motor to the motor mount
and replace it with a new motor.
5. Replace motor mount to the dryer.

450371-1 www.adclaundry.com 15
Front Support Rollers
TO REPLACE ROLLERS
1. Follow procedure “To Replace Front Panel Assembly”.
2. Loosen and remove the bolt at the center of the wheel.
3. Remove wheel, belt and wheel spacer.
4. Slide bolt out of wheel.
NOTE: Do not lose brass wheel spacer.
5. Reverse procedure for installing new wheel.
Lint Drawer Screen
TO REPLACE LINT SCREEN
1. Open lint door and remove two screws holding lint screen
retainer in place.
2. Remove the lint screen and inspect for rips or tears by
sliding up and out of side tracks. Replace with new lint
screen, if damaged.
3. Reverse procedure for installing the new lint bag.
4. Close the lint door.
Troubleshooting _______________________
The information provided will help isolate the most probable
components associated with the difficulty described. The
experienced technician realizes, however, that a loose
connection or broken or shorted wire may be at fault where
electrical components are concerned...not necessarily the
suspect component itself.
Electrical parts should always be checked for failure before
being returned to the factory.
The information provided should not be construed as a device
foruse by an untrained personin making repairs. Onlyproperly
licensed technicians should service the equipment.
Observe all safety precautions displayed on the equipment or
specified in this manual while making repairs.
Phase 7 Non-Coin Microprocessor
Controller (Computer) System
Diagnostics ____________________________
IMPORTANT: YOU MUST DISCONNECT AND LOCK OUT
THE ELECTRIC SUPPLY AND THE GAS OR 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.
All major circuits, including the door, the Phase 7 non-coin
microprocessor controller (computer) temperature sensor, and
the heat and motor circuits are monitored. The Phase 7 non-
coin microprocessor controller (computer) will inform the user,
via the L.E.D. display of certain failure messages, along with
L.E.D. indicators on the I/O board on the back panel of the
front right control door.
Diagnostic (L.E.D. Display) Fault Messages
BURNER CONTROL FAULT – This routine monitors the gas
return valve signal and compares it with the DSI purge time
setting. If the gas return valve signal does not turn on before
the DSI purge time expires, or if it turns on for less than 200
ms,the Phase 7 non-coinmicroprocessorcontroller (computer)
will turn off the heat output, increase a counter, and wait the
interpurge time before reattempting to ignite the burner. Once
thisfault condition occurs five (5) consecutive times, the Phase
7 non-coin microprocessor controller (computer) will interrupt
the cycle and will display “BURNER CONTROL FAULT” and
will go into a Fault Mode with a brief audio indication. If the
tumbler temperature is above 100° F (38° C) at the time of the
failure, the Phase 7 non-coin microprocessor controller
(computer) will continue to display “BURNER CONTROL
FAULT”, while the dryer cools by running with no heat for 3
minutes or until the temperature drops below 100° F (38° C). If
the tumbler temperature is below 100° F (38° C), or the 3
minutesexpire, the Phase 7non-coin microprocessor controller
(computer)will shut offall outputsandwill remain in Fault Mode
until the dryer is addressed.

16 American Dryer Corporation 450371-1
BURNER HIGH-LIMIT FAULT – This routine monitors the
burner high-limit switch. If the switch opens during the cycle
while the heat is on, the dryer will display “Burner High-Limit
Fault” and will go into Fault Mode with a brief audio indication.
The Phase 7 non-coin microprocessor controller (computer)
will check the tumbler temperature. If the exhaust probe
temperature is above 100° F (38° C), the dryer will continue to
display “Burner High Limit Fault”, while the dryer cools by
running with no heat for 3 minutes or until the temperature
drops below 100° F (38° C). Once the exhaust probe
temperature is below 100° F (38° C), or the 3 minutes expire,
thePhase 7 non-coin microprocessor controller (computer) will
shut off all outputs and will remain in Fault Mode until the dryer
is addressed.
CHECK CONTROL BOARD FUSE #2 – This routine identifies
the opening of the main fuse (fuse 2) on the Phase 7 non-coin
microprocessor controller (computer) board. If the fuse has
opened, the Phase 7 non-coin microprocessor controller
(computer) will not allow a cycle to begin and will display a
“Check Control Board Fuse #2” condition. If the fuse has
opened after the cycle has begun, it will still trigger the check
main fuse fault. The dryer will shut off all outputs and will go
into Fault Mode with a brief audio indication.
CLEAN LINT – This routine monitors the opening of the lint
drawer switch and compares the time between openings to
the Lint Cleaning Frequency Setting. This routine will first
prompt the user to clean lint before locking out the dryer. Once
the time between cleanings is equal to the Lint Cleaning
Frequency Setting, the display will prompt the user to clean
lint. The Lint Cleaning Frequency limits the amount of time the
dryer will run before the Phase 7 non-coin microprocessor
controller (computer) locks the dryer out for further use. If the
lint drawer is not cleaned within 2 hours of run time, the Phase
7 non-coin microprocessor controller (computer) will be locked
out.
EXHAUST HIGH-LIMIT FAULT – This routine monitors the
tumbler safety over temperature switch. If the switch opens,
the dryer will display “Exhaust High-Limit Fault” and will go into
Fault Mode with a brief audio indication. If the tumbler
temperature is above 100° F (38° C) the dryer will continue to
display “Exhaust High-Limit Fault”, while the Phase 7 non-coin
microprocessor controller (computer) cools by running with
no heat for 3 minutes or until the temperature drops below
100° F (38° C). Once the tumbler temperature is below 100° F
(38° C), or the 3 minutes expire, the Phase 7 non-coin
microprocessor controller (computer) will shut off all outputs
and will remain in Fault Mode until the dryer is addressed.
EXHAUST PROBE FAULT / AXIAL PROBE FAULT – This
routineindicates a problem with the temperature sensor circuit.
This error will trigger an “Exhaust Probe Fault or Axial Probe
Fault” condition and will go into a Fault Mode with a brief audio
indication. The dryer will run with no heat for 3 minutes. Once
the 3 minutes expire, the Phase 7 non-coin microprocessor
controller (computer) will shut off all outputs and will remain in
Fault Mode until the dryer is addressed.
IGNITION FAULT –AfterthePhase 7 non-coin microprocessor
controller (computer) receives a gas valve return for more than
200 ms signal within the DSI purge time, the Phase 7 non-coin
microprocessor controller (computer) will begin a DSI proof
time. The Phase 7 non-coin microprocessor controller
(computer) will continue to recheck the gas valve return signal.
If the signal is lost during the DSI proof time, the Phase 7 non-
coin microprocessor controller (computer) will turn off the heat
output and determine what the retry count is set at. If the retry
countis greaterthan zero,thePhase 7non-coin microprocessor
controller (computer) will wait through the interpurge time and
attempt to reignite the flame. If the failure condition occurs
again, the Phase 7 non-coin microprocessor controller
(computer) will retry until the retry count has been satisfied.
Once the retry count has been satisfied, the Phase 7 non-coin
microprocessorcontroller (computer) willinterrupt the cycle and
display “Ignition Fault” condition and go into a Fault Mode with
a brief audio indication. If the tumbler temperature is above
100°F (38° C), the Phase 7 non-coin microprocessor controller
(computer) will continue to display “Ignition Fault”, while the
dryer cools by running with no heat for 3 minutes or until the
temperature drops below 100° F (38° C). Once the tumbler
temperature is below 100° F (38° C), or the 3 minutes expire,
thePhase 7 non-coin microprocessor controller (computer) will
shut off all outputs and will remain in Fault Mode until the dryer
is addressed.
FLAME FAULT – After the Phase 7 non-coin microprocessor
controller (computer) has verified that the gas valve signal was
present throughout the DSI purge time and the DSI proof time,
thePhase 7 non-coin microprocessor controller (computer) will
continue to monitor the gas valve return signal. In the event
that the gas valve return signal is lost anytime after the DSI
proof time, the Phase 7 non-coin microprocessor controller
(computer) will turn off the heat output and increase a counter.
Once this fault condition occurs five (5) consecutive times, the
Phase 7 non-coin microprocessor controller (computer) will
interrupt the cycle, display “Flame Fault” condition, and go into
a Fault Mode with a brief audio indication. If the tumbler
temperature is above 100° F (38° C), the Phase 7 non-coin
microprocessor controller (computer) will continue to display
“Flame Fault”, while the dryer cools by running with no heat for
3 minutes or until the temperature drops below 100° F (38° C).
Once the tumbler temperature is below 100° F (38° C), or the 3
minutesexpire, the Phase 7non-coin microprocessor controller
(computer)will shut offall outputsandwill remain in Fault Mode
until the dryer is addressed.
BURNER PURGE FAULT – If the Phase 7 non-coin
microprocessor controller (computer) detects the presence of
the gas return signal before sending the heat signal out, the
Phase 7 non-coin microprocessor controller (computer) will
trigger a “Burner Purge Fault” condition and will go into Fault
Mode with a brief audio indication. The dryer will run with no
heat for 3 minutes or until the temperature drops below 100° F
(38° C). Once the tumbler temperature is below 100° F (38°
C), or the 3 minutes expire, the Phase 7 non-coin
microprocessor controller (computer) will shut off all outputs
and will remain in Fault Mode until the dryer is addressed.

450371-1 www.adclaundry.com 17
EXHAUST HIGH TEMP FAULT – This error routine indicates
a problem with overheating. This error will initiate an “Exhaust
High Temp Fault” condition and will go into Fault Mode with a
brief audio indication. The Phase 7 non-coin microprocessor
controller (computer) determines this error by monitoring the
temperature sensor input to have a steady gradual increase in
temperature to a known upper limit (the limit typically is 20°
overthe maximum allowed programmablesetpoint). The dryer
willrun with no heat for 3minutesor until the temperature drops
below 100° F (38° C). Once the tumbler temperature is below
100° F (38° C), or 3 minutes expire, the Phase 7 non-coin
microprocessor controller (computer) will shut off all outputs
and remain in Fault Mode until the dryer is addressed.
LINT ACCESS OPEN – Indicates the lint drawer is open and
needs to be closed.
MAIN DOOR OPENED –Indicates the main door isopen when
it should be closed.
MODEL ERROR, ENTER CORRECT MODEL – This routine
monitors the inputs, such as the sail switch and gas valve.
Steam dryers do not use a sail switch or valve input, and an
electric dryer will not use a gas valve input. These signals
allow the Phase 7 non-coin microprocessor controller
(computer) to interpret what type of dryer it is controlling. The
Phase 7 non-coin microprocessor controller (computer)
determines what the expected dryer responses should be for
thatspecificheattypedryer. Anytimea model fault is detected,
thePhase 7 non-coin microprocessor controller (computer) will
interrupt the cycle and will display “Model Error, Enter Correct
Model–” and go into Fault Mode with a brief audio indication. If
the tumbler temperature is above 100° F (38° C) at the time of
the failure, the Phase 7 non-coin microprocessor controller
(computer) will continue to display “Model Error, Enter Correct
Model–” while the dryer cools by running with no heat for 3
minutes or until the temperature drops below 100° F (38° C).
Once the tumbler temperature is below 100° F (38° C), or the 3
minutesexpire, the Phase 7non-coin microprocessor controller
(computer)will shut offall outputsandwill remain in Fault Mode
until the dryer is addressed.
NOTE: If a model error occurs, the Phase 7 non-coin
microprocessor controller (computer) will always default to
the “gas” type for safety reasons. Also, the dryer will be
stopped and forced into a restart condition to reevaluate all
the expected responses.
ROTATION SENSOR FAULT –This routine monitorsthe pulses
from the rotational sensor input. It basically times the dwell
between signals. If the time between the pulses exceeds
10-seconds, the Phase 7 non-coin microprocessor controller
(computer) will trigger a “Rotation Sensor Fault” condition and
willgointoFaultModewithabrief audio indication. Depending
on the model type, the dryer will run the fan with no heat for 3
minutes or until the temperature drops below 100° F (38° C)
for GAS REVERSING, ELECTRIC REVERSING and STEAM
REVERSING models. Once the tumbler temperature is below
100° F (38° C), or the 3 minutes expire, the Phase 7 non-coin
microprocessor controller (computer) will shut off all outputs
and remain in Fault Mode until the dryer is addressed. If the
dryer model is a GAS NON-REVERSING, ELECTRIC NON-
REVERSING or STEAM NON-REVERSING model, the Phase
7 non-coin microprocessor controller (computer) will
immediately shut off all outputs, regardless of the tumbler
temperature, and remain in Fault Mode until the dryer is
addressed.
SAIL SWITCH CLOSED FAULT – This routine prevents the
start-upofthe dryerunlessthe sailswitchis inthe open position.
If the sail switch is in the closed position prior to starting, the
Phase 7 non-coin microprocessor controller (computer) will
display“PLEASE WAITSTARTUPINPROCESS” andwill allow
the Phase 7 non-coin microprocessor controller (computer)
10-seconds for the sail switch to open before faulting out on a
“Sail Switch Closed Fault”. Once the dryer faults out on the
“SailSwitch Closed Fault”, the dryer will not be allowed to start.
This routine is also monitored at every start-up, including a
start-up after being in Pause Mode. If the sail switch is in the
closed position prior to starting from a Pause Mode, the Phase
7 non-coin microprocessor controller (computer) will display,
“PLEASEWAITRESTARTIN PROCESS” and allow the Phase
7 non-coin microprocessor controller (computer) 10-seconds
for the sail switch to open before faulting out on a “Sail Switch
Closed Fault”. Again, once the dryer faults out on the “Sail
Switch Closed Fault”, the dryer will not be allowed to start.
Anytime the fault occurs, there will be an audio indication and
start/restart will be prevented.
SAIL SWITCH OPEN FAULT – If the sail switch does not close
within 8-seconds of starting or restarting a cycle, the Phase 7
non-coinmicroprocessor controller (computer) will display “Sail
SwitchOpen Fault” condition. Or,if the sailswitch opens during
a cycle, the Phase 7 non-coin microprocessor controller
(computer)will immediately shut offtheheat output and monitor
how long the sail switch is open for. If the sail switch is open
for more than 30-seconds, the Phase 7 non-coin
microprocessor controller (computer) will display “Sail Switch
Open Fault” condition and go into Fault Mode with a brief audio
indication. If the tumbler temperature is above 100° F (38° C),
thePhase 7 non-coin microprocessor controller (computer) will
continue to display “Open Sail Switch Fault” while the dryer
cools by running with no heat for 3 minutes or until the
temperature drops below 100° F (38° C). Once the tumbler
temperature is below 100° F (38° C), or the 3 minutes expire,
thePhase 7 non-coin microprocessor controller (computer) will
shut off all outputs and remain in Fault Mode until the dryer is
addressed.
S.A.F.E. SYSTEM ACTIVATED – Indicates that the Phase 7
non-coin microprocessor controller (computer) has detected a
fire and is currently extinguishing the flame.
S.A.F.E. SYSTEM WASACTIVATED – Indicatesthat the Phase
7 non-coin microprocessor controller (computer) detected a
fire and has extinguished the flame.
S.A.F.E. System Diagnostic Conditions
Inthe eventthat the Phase7 non-coin microprocessorcontroller
(computer) detects a fault in the S.A.F.E. system, the Phase 7
non-coin microprocessor controller (computer) will display the
message “S.A.F.E. SYSTEM DISABLED … READY”. To find
the reason for the S.A.F.E. system disabling, press and hold
the red “STOP/CLEAR” and green “START/ENTER” keys.
Doing so will cause the Phase 7 non-coin microprocessor
controller (computer) to display one (1) of the following
diagnostic messages:
OPEN THERMISTOR PROBE – This message indicates that
the S.A.F.E. system thermistor probe is either not connected
or is damaged. If this condition is detected, the Phase 7 non-
coinmicroprocessor controller(computer) willimmediately enter
S.A.F.E. SYSTEM DISABLED Mode.

18 American Dryer Corporation 450371-1
SHORTED THERMISTOR PROBE – This message indicates
that the S.A.F.E. system thermistor probe is damaged or the
wiring is shorted. If this condition is detected, the Phase 7
non-coinmicroprocessor controller (computer) will immediately
enter S.A.F.E. SYSTEM DISABLED Mode.
DISCONNECTED WATER VALVE – This indicates that the
water valve is open or that it is not connected to the Phase 7
non-coinmicroprocessor controller (computer). If this condition
is detected, the Phase 7 non-coin microprocessor controller
(computer) will continue to monitor the condition for a period of
5minutes before entering S.A.F.E.SYSTEM DISABLED Mode.
Once the condition is corrected, the Phase 7 non-coin
microprocessor controller (computer) will continue to monitor
the condition for 1 minute before exiting S.A.F.E. SYSTEM
DISABLED Mode.
SHORTED WATER VALVE – This indicates the water valve is
shorted or the wiring to the valve is shorted. If this condition is
detected, the Phase 7 non-coin microprocessor controller
(computer) will continue to monitor the condition for a period of
5minutes before entering S.A.F.E.SYSTEM DISABLED Mode.
Once the condition is corrected, the Phase 7 non-coin
microprocessor controller (computer) will continue to monitor
the condition for 1 minute before exiting S.A.F.E. SYSTEM
DISABLED Mode.
WATER NOT CONNECTED – This indicates that there is no
water pressure at the water valve. This will occur if water is not
connected to the dryer or if there is low water pressure in the
water line coming to the dryer. This could also be a defective
pressureswitch orwiringto thepressureswitch. If this condition
is detected, the Phase 7 non-coin microprocessor controller
(computer) will continue to monitor the condition for a period of
5minutes before entering S.A.F.E.SYSTEM DISABLED Mode.
Once the condition is corrected, the Phase 7 non-coin
microprocessor controller (computer) will continue to monitor
the condition for 1 minute before exiting S.A.F.E. SYSTEM
DISABLED Mode.
I/O Board L.E.D.
INDICATORS
Inputs (Red L.E.D.)
1. ESTOP–This L.E.D. will indicate thestatusof the E-STOP.
If the E-STOP has been pressed, then the L.E.D. is ON.
2. GAS_V – This L.E.D. will indicate the status of the gas
valve. If the gas valve is open (ON), then the L.E.D. is
ON.
3. BRHL – This L.E.D. will indicate the status of the burner
high limit disk. If the disk is closed (temperature below
330° F [166° C]), then the L.E.D. is ON.
4. SAIL–This L.E.D. will indicate the status of the sail switch.
If the switch is closed, then the L.E.D. is ON.
5. EXHL – This L.E.D. will indicate the status of the exhaust
high limit disk. If the disk is closed (temperature below
225° F [107° C]), then the L.E.D. is ON.
6. MAIN – This L.E.D. will indicate the status of the main
door. If the door is closed, then the L.E.D. is ON.
7. LINT– This L.E.D. will indicate the statusof the lint drawer.
If the drawer is closed, then the L.E.D. is ON.
8. FUSE – This L.E.D. will indicate the status of the Phase 7
non-coin microprocessor controller (computer) voltage. If
the power on button is pressed (green button light is on),
then the L.E.D. is ON.
9. H2O – This L.E.D. will indicate the status of the water
pressure switch on the S.A.F.E. system water line. If water
pressure is present, then the L.E.D. is ON.
A. The display reads “Exhaust High Limit Fault”.
(Refer to page 20)
The temperature in the tumbler is above 190° F (88° C) or
follow Steps #1 through #3.
1. Check for voltage (24 VAC) at the computer on the J5
connector from pin 1 to ground. If no voltage is present,
either you have a poor connection at the J5 connector or
thecomputerboardisfaulty. If voltage(24 VAC)is present,
proceed to Step #2.
2. Check for voltage at the exhaust high limit thermostat. If
voltage is present at only one side the thermostat is open
and needs to be replaced. If voltage is present at both
sides, proceed to Step #3.
3. Check for voltage at the J5 connector pin 2 to ground. If
no voltage is present, check for a loose wire between the
J5 connector and thermostat. If voltage is present then
the computer board is bad and needs to be replaced.
B. The display reads “Burner High Limit Fault”.
(Refer to page 20)
1. Indicates the tumbler hi-limit has tripped.
2. Check for a block or restriction in the exhaust.
3. Make sure the exhaust is properly sized.
4. Make sure location has adequate make-up air.
5. Check for voltage (24 VAC) at the computer board J4
connector pin 3 red wire to ground. If no voltage (24 VAC),
check for a loose connection or change the computer
board. If voltage is present, proceed to Step #6.
6. Check for voltage at the burner high limit thermostat (the
sail switch must be closed at time of test). If voltage is
present at only one side the thermostat is open and needs
to be replaced. If voltage is present at both sides, proceed
to Step #7.
7. Check for voltage at the J4 connector pin 4 to ground. If
no voltage is present, check for a loose wire between the
J4 connector and thermostat. If voltage is present then
the computer board is bad and needs to be replaced.
C. The display reads “Bad Exhaust Temp Probe”.
(Refer to page 22)
1. Check for a loose connection or short between the
computer J3 connector pins 1 and 2, and the pin
connections 1 and 2 of P25 and J25 which lead to the
temperature sensor probe.
2. If connections are fine, next change the temperature
sensor probe.
3. If thedisplaystill reads “Bad Exhaust Temp Probe,” change
the computer board.
D. The display reads “Sail Switch Open Fault”.
(Refer to page 20)
1. The sail switch has opened while dryer is in the heating
mode. Is the blower motor running normally? If not
troubleshoot blower motor.
2. Check for block or restriction in the exhaust.

450371-1 www.adclaundry.com 19
3. Make sure exhaust is sized properly.
4. Clean the lint screen.
5. Make sure all doors and access panels are closed and
sealed well.
E. The display reads “Sail Switch Closed Fault”.
(Refer to page 20)
1. Prior to start up, the sail switch is in the closed position.
Is the switch stuck, if so free up the mechanism and check
for moisture or broken components.
2. Check the sail switch and readjust accordingly.
3. Replace sail switch, if necessary.
F. The display reads “Burner Ignition Control Fault”.
(Refer to page 20)
1. Check for 24 VAC at the DSI module across MV and GND
during the ignition process. If no voltage, replace the DSI
module. If voltage is present, check for 24 VAC at the gas
valve on terminals 1 and 2. If no voltage, check for a loose
connection on the wires going back to the DSI module. If
voltage is present, proceed to Step #2.
2. Check for voltage at J4 connector pin 6 during the ignition
process. If no voltage check for a loose connection
between the gas valve and computer connection at J4. If
voltage is present replace the computer board.
G. Tumbler will not rotate display reads “Rotation
Fault”. (Refer to page 21)
1. Does the tumbler turn? If so check the list below, If not
proceed to step two.
a. Rotational sensor is out of adjustment.
b. Rotational sensor magnet is missing or broke.
2. Check thelistof items that will stopthe tumbler from turning
below.
a. Belt is broke, loose, or slipping
b. Check for fault codes on VFD.
c. Check for 24 VAC at the computer board J8
connector pin 8 brown wire to GND. If no voltage is
present, check for a loose connection, if connection
is good, replace computer. If voltage is present,
proceed to next step.
3. Check for 24 VAC on the motor relay CR6 coil. If no
voltage, check for a loose connection in the wire. If voltage
is present, proceed to next step.
4. Check for 24 VACon the motor relay CR6 at NO to ground.
If no voltage, replace motor relay. If voltage is present,
proceed to next step.
5. Check for +24V at B5 on the VFD and If present replace
the VFD. If voltage is not present check for a loose
connection between CR6 and the VFD.
H. Tumbler does not alter speed through drying cycle.
1. Look for fault codes on VFD. If no fault codes proceed to
next step.
2. Check for loose connections on thermistor probe under
drum.
3. Test resistance of thermistor probe. Probe should read
roughly 175K ohms at room temperature.
I. Drive motor operates in forward mode, but does not
reverse, blower motor runs. The display reads
“Rotation Fault”.* (Refer to page 21)
1. Possible causes:
a. Belt is loose or slipping.
b. Rotational sensor is out of adjustment.
c. Check for 24 VAC at the computer board J8
connector pin 9 gray wire to GND. If no voltage is
present, check for a loose connection, if connection
is good, replace computer. If voltage is present,
proceed to next step.
2. Check for 24 VAC on the drive motor relay CR7 coil. If no
voltage, check for a loose connection in the wire going
back to the relay. If voltage is present, proceed to next
step.
3. Check for proper voltage on NO to ground of the relay
CR7. If no voltage, replace relay. If voltage is present,
proceed to next step.
4. Check for fault codes on VFD.
J. The display reads “Cycle Paused, Main Door Open”.
(Refer to page 22)
1. Make sure main door is closed.
2. Make sure main door has good contact with the main door
switch.
3. Check for voltage (24 VAC) at the computer board J8
connectorpin5.Ifnovoltage,check for a loose connection
or change the computer board. If voltage is present,
proceed to Step #4.
4. Check for voltage to the main door switch. If voltage is
present check that the switch has continuity when
depressed, if not replace switch. If switch has continuity
proceed to Step #5.
5. Check for voltage (24 VAC) at the computer board J8
connectorpin6.Ifnovoltage,check for a loose connection
between the switch and the computer. If voltage is present
change the computer board.
K. The display reads “Cycle Paused, Lint Access
Open”. (Refer to page 22)
1. Make sure lint drawer is closed.
2. Make sure lint drawer has good contact with the switch.
3. Check for voltage (24 VAC) at the computer board J8
connectorpin3.Ifnovoltage,check for a loose connection
or change the computer board. If voltage is present,
proceed to Step #4.
4. Check for voltage to the lint drawer switch. If voltage is
present check that the switch has continuity when
depressed, if not replace switch. If switch has continuity
proceed to Step #5.
5. Check for voltage (24 VAC) at the computer board J8
connectorpin4.Ifnovoltage,check for a loose connection
between the switch and the computer. If voltage is present
change the computer board.

20 American Dryer Corporation 450371-1