ML-96 / ML-122
Service Manual
American Dryer Corporation
88 Currant Road
Fall River MA 02720-4781 USA
Telephone: +1 (508) 678-9000 / Fax: +1 (508) 678-9447
ADC Part No. 450412-4
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Table of Contents _______
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.
“Caution: Label all wires prior to disconnection
when servicing controls. Wiring errors can
cause improper operation.”
«Attention: Lor des opérations d’entretien des
commandes étiqueter tous fils avant de les
déconnecter. Toute erreur de câblage peut étre
une source de danger et de panne.»
CAUTION
Dryers should never be left unattended while in
operation.
WARNING
Children should not be allowed to play on or near
the dryer(s). Children should be supervised if
near dryers in operation.
FOR YOUR SAFETY
Do not dry mop heads in the dryer. Do not use
dryer in the presence of dry cleaning fumes.
WARNING
Under no circumstances should the door switch
or the heat circuit devices 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.
Dryer must never be operated without the lint
filter/screen in place, even if an external lint
collection system is used.
List of Acronyms _____________________
IMPORTANT
Please observe all safety precautions displayed
on the equipment and/or specified in the
installation and operator's manual included with
the dryer.
HSI
Hot Surface Ignition
HV
High Voltage
in wc
Inches of Water Column
L.E.D. Light Emitting Diode
L.P.
Liquid Propane
Dryers must not be installed or stored in an area
where it will be exposed to water or weather.
OPL
On-Premise Laundry (Non-Coin)
OSHA Occupational Safety and Health Administration
S.A.F.E. Sensor Activated Fire Extinguishing
T.E.F.C. Totally Enclosed, Fan-Cooled
The wiring diagram for the dryer is located in
the front electrical control box area.
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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.
Important Information _______________
Safety Precautions
WARNING: For your safety, the information in
this manual must be followed to minimize the
risk of fire or explosion or to prevent property
damage, personal injury, or loss of life.
!
NOTE: Failure to do so will void the warranty.
The dryer must never be operated with any of the back
guards, outer tops, or service panels removed.
Personal injury or fire could result.
Under no circumstances should the dryer door switches,
lint door switch, heat safety circuit ever be disabled.
WARNING: Personal injury or fire could result.
!
Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.
This dryer is not to be used in the presence of dry cleaning
solvents or fumes.
Purchaser/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.
Remove articles from the dryer as soon as the drying cycle
has been completed.
WARNING: Articles left in the dryer after the
drying and cooling cycles have been
completed can create a fire hazard.
What To Do If You Smell Gas...
• Do not try to light any appliance.
!
• Do not touch any electrical switch.
Do not operate steam dryers with more than 125 PSI (8.61
bar) steam pressure. Excessive steam pressure can
damage steam coil and/or harm personnel.
• Do not use any phone in your building.
• Clear the room, building, or area of all occupants.
Replace leaking flexible hoses or other steam fixtures
immediately. Do not operate the dryer with leaking flexible
hoses. Personal injury may result.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
Read and follow all caution and direction labels attached
to the dryer.
• Installation and service must be performed by a
qualified installer, service agency, or gas supplier.
WARNING: 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.
• Dryer(s) must be exhausted to the outdoors.
!
• Although ADC produces a very versatile machine, 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” cleaner. Explosion could result.
Routine Maintenance ________________
Cleaning
!
A program and 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 upon proper air circulation. The accumulation
of lint can restrict this airflow. If the guidelines in this section
are met, an ADC dryer will provide many years of efficient,
trouble free, and – most importantly – safe operation.
Do not dry rags or articles coated or contaminated
with gasoline, kerosene, oil, paint, 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 also may be a fire hazard.
WARNING: Lint from most fabrics is highly
combustible. The accumulation of lint can
create a potential fire hazard.
A program should be established for the inspection and
cleaning of lint in the heating unit area, exhaust ductwork,
and inside the dryer. The frequency of inspection and
cleaning can best be determined from experience at each
location.
!
Keep dryer area clear and free from combustible
materials, gasoline and other flammable vapors and
liquids.
WARNING: The collection of lint in the burner
area and exhaust ductwork can create a
potential fire hazard.
NOTE: Suggested time intervals shown for average
usage, which is considered 6 to 8 operational (running)
hours per day.
!
Clean lint drawer and screen every third load.
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NOTE: Frequency can best be determined at each
location.
Lubrication
The drive shaft bearings and idler shaft bearings should
be lubricated every 3 months. Use a #3 grease or
equivalent. Lubrication is necessary.
Daily
(Beginning) of each work shift.
The motor bearings and under normal/most conditions
the tumbler bearing are permanently lubricated. It is
physically possible to re-lubricate the tumbler bearing if
you choose even though this practice may not be necessary.
Use Industrial Chevron ball or roller bearing SRI grease
NLGI2 or its equivalent, which has a broad operating
temperature range of 22º F (-6º C) to 350º F (177º C).
Clean lint from the drawer and screen. Inspect lint screen
and replace if torn.
Weekly
Clean lint accumulation from lint chamber, thermostat, and
microprocessor temperature sensor (sensor bracket) area.
WARNING: To avoid the hazard of electrical
shock, discontinue electrical supply to dryer.
Installation Requirements ___________
!
Installation should be performed by competent technicians
in accordance with local and state codes. In the absence
of these codes, the installation must conform to applicable
AMERICAN NATIONAL STANDARDS: National Fuel Gas
Code ANSI.Z223.1-LATEST EDITION or National Electrical
Code ANSI/NFPA No. 70-LATEST EDITION, or in Canada,
the installation must conform to 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).
90 Days
Remove lint from tumbler, drive motors, and surrounding
areas. Remove lint from gas valve burner area with a
dusting brush or vacuum cleaner attachment.
NOTE: To prevent damage, avoid cleaning, or touching
ignitor and flame-probe assembly.
Remove lint accumulation from inside control box and at
rear area behind control box.
Every 6 Months
Inspect and remove lint accumulation in customer
furnished exhaust ductwork system and from dryer’s
internal exhaust ducting.
Enclosure, Air Supply,
and Exhaust Requirements
NOTE: The following information is very brief and
general. For detailed description, refer to the installation
manual supplied with dryer.
WARNING: The accumulation of lint in the
exhaust ductwork can create a potential fire
hazard.
!
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. (Refer to appropriate installation manual for
recommended distances and minimum allowances
required.)
Do not obstruct the flow of combustion and ventilation
air. Check customer furnished back draft damper in
exhaust ductwork. Inspect and remove any lint
accumulation, which can cause damper to bind or
stick.
When the dryer is operating, it draws in room air, heats it,
passes this air through the tumbler, and exhausts it out of
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.
The air supply must be given careful consideration to insure
proper performance of each dryer.
NOTE: A back draft damper that is sticking partially
closed can result in slow drying and shutdown of the heat
circuits safety switches or thermostats.
When cleaning dryer cabinets, avoid using harsh
abrasives. A product intended for cleaning appliances is
recommended.
Adjustments
7 Days After Installation
IMPORTANT: Make-up air must be provided from a
source free of dry cleaning fumes. Make-up air that is
contaminated by dry cleaning fumes will result in
irreparable damage to motors and other dryer
components.
and Every 6 Months Thereafter
Inspect bolts, nuts, screws, (bearing setscrews),
nonpermanent gas connections (unions, shutoff valves,
orifices, and grounding connections). Motor and drive belts
should be examined. Cracked or seriously frayed belts
should be replaced. Tighten loose V-belts when necessary.
Complete operational check of controls and valves.
Complete operational check of all safety devices (door
switch, lint drawer switch, sail switch, burner and hi-limit
thermostats).
Exhaust ductwork should be designed and installed by a
competent technician. 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, burner hi-limit or lint chamber
hi-heat protector thermostat. (Refer to appropriate
installation manual for more details.)
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CAUTION: Improperly sized or installed
exhaust ductwork can create a potential fire
hazard.
Make a complete operational check of all the operating
controls to assure that the timing is correct, temperature
selection switches are functioning, etc.
!
Make a complete operational check of all safety-halted
circuits: door switches, hi-limit thermostat, sail switch,
cycling thermostats, etc.
Electrical and Gas Requirements
It is your responsibility to have all electrical connections
made by a properly licensed and competent electrician to
assure the electrical installation is adequate and conforms
with local and state regulations or codes. In the absence
of such codes, all electrical connections, material, and
workmanship must conform to the applicable requirements
of 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 (for
Electrical Connections).
For gas dryers a 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 pressure tap on the gas valve body):
Natural Gas ______ 3.5 in wc (8.7 mb).
L.P. Gas__________ 10.5 in wc (26.1 mb).
If computer program changes are required, refer to the
operator’s manual, which was supplied with the dryer.
IMPORTANT: Failure to comply with these codes or
ordinances and the requirements stipulated in this
manual can result in personal injury or component
failure.
The dryer should be operated through one complete cycle
to assure that no further adjustments are necessary and
that all components are functioning properly.
The dryer installation must meet the American National
Standard, National Fuel Gas Code ANSI Z223.1-LATEST
EDITION, or in Canada, the Canadian Electrical Codes
Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION (for
Electrical Connections) as well as, local codes and
ordinances, and must be done by a qualified technician.
Check the electric service phase sequence. While the dryer
is operating, check to see if the tumbler is rotating in the
proper direction. Looking from the front, the tumbler should
spin in the clockwise direction. If so, the phasing is correct.
If the phasing is incorrect, reverse 2 leads at connections
L1, L2, or L3 of power supply to the dryer.
NOTE: Undersized gas piping will result in ignition
problems and slow drying and can create a safety
hazard.
Description of Parts _________________
Control Panel (Microprocessor)
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, contact the
reseller who sold the dryer or contact the factory.
Lifting the control door will reveal the control panel
assembly. Opening the control panel will allow access to
the major components, which include the microprocessor
computer board and the keypad.
The gas input ratings shown on the dryer data label are for
elevations up to 2,000 feet (610 meters), unless elevation
requirements of over 2,000 feet (610 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 (610 meters) are made by changing the
burner orifices. If this adjustment is necessary, contact the
reseller who sold the dryer or contact the factory.
NOTE: Any burner changes must be made by a qualified
technician.
Operational Service Check Procedure
Turn on electric power to the dryer.
To start dryer:
Display will read “READY.”
Press “E” on the keypad of microprocessor controller
(computer).
The dryer will start to run.
NOTE: Pressing keypad selections “A,” “B,” “C,” “D,” or
“F” will also start the dryer. Six preprogrammed drying
cycles (A through F) have been stored in the computer’s
memory. (Refer to the computer operator’s manual for
details.)
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Reversing Relay Panel
Lifting the control door will reveal the reversing relay box.
Located on the back of the relay box is the reversing relay
panel. Included on this panel is a 4-position terminal block,
blower overload, blower contactor, reversing contactor, 24
VAC transformer, fuse or circuit breaker, ground lug, and
possibly an arc suppressor board.
NOTE: With the dryer off or no air supply to the damper
piston, the damper is in the cool down mode.
Steam Coil pH Level
NOTE: The normal pH level for copper type steam coils
must be maintained between a value of 8.5 to 9.5. For
steel type steam coils the pH level must be maintained
between a value of 9.5 to 10.5. These limits are set to
limit the acid attack of the steam coils.
IMPORTANT: Coil failure due to improper pH level will
void the warranty.
Gas Burner Assembly
Gas heated dryers are equipped with a gas burner assembly
consisting of 3 burner tubes, a gas valve, an ignitor, a flame
sensor, a sail switch, a hi-limit thermostat, and an ignition
control module. The inlet piping enters through the rear of
the dryer on the left-hand side (viewing from the front) and
runs to the front of the dryer where the gas valve is located.
Steam Damper Actuator System
The steam damper actuator system consists of a hinged
damper plate, pneumatic piston, and a 24 volt solenoid
valve with a needle valve to control the speed of the piston
actuation.
Drive Motor
The T.E.F.C. drive motor is located in the rear right corner
(viewing from front) behind the front panel of the dryer. It
sits on an adjustable base so the motor can be easily
adjusted to the left or right, up or down, forward or backward.
Steam Coil and Damper System
The steam coil is constantly charged, thereby eliminating
repeated expansion and contraction and also provide
instant heating to start the drying process. The steam
damper, located on top of the steam coil, is the only
temperature controlling device in this system. When the
steam damper is open, ambient air is drawn through the
coil providing heat to the dryer. When the steam damper is
closed, ambient air is drawn directly into the tumbler,
bypassing the coil, allowing a rapid cool down.
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Drive Shaft Assembly
Main Door Switch
(Viewing from the front of the dryer)
The main door switch is mounted to the front panel behind
the main door. When the main door opens, the switch will
also open, preventing the dryer from operating. The main
door switch is a safety device and should never be disabled.
Behind front panel on the right side of the dryer, you can
view the drive shaft assembly, which consists of a 9-inch
(22.86 cm) drive pulley, two 6-inch (15.24 cm) wheels, and
two 1-inch (2.54 cm) pillow block bearings.
Idler Shaft Assembly
(Viewing from the front of the dryer)
Behind the front panel on the left side of the dryer you will
view the idler shaft assembly, which consists of one 6-inch
(15.24 cm) wheel, and two 1-inch (2.54 cm) pillow block
bearings.
Sail Switch (Gas Models Only)
The sail switch is located on the front of the burner box. A
sail switch consists of a round damper plate on a lever
arm, which is in contact with an electric switch. When the
fan/blower comes on, it draws air through the gas burner.
This creates a negative pressure inside the burner box,
and this negative pressure pulls in the round damper and
activates the sail switch.
Tumbler
The tumbler consists of a tumbler, which has 4 ribs and 4
removable perforated panels, which are mounted to the rib
sections of the tumbler with 1/4-20 x 1/4” socket button
head screws.
Burner Hi-Limit
(Gas Models Only)
The hi-limit thermostat is
a disc-type thermostat
set at 330º F (166º C) and
located near the burner.
If the burner flame gets
too hot, this thermostat
will shut off the burner.
This is generally caused
by low airflow through the
dryer.
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Temperature Sensor Bracket
Servicing _____________________________
Introduction
All electrical and mechanical service or repairs should be
made with the electrical power to the dryer disconnected
(power off).
This is located inside the dryer in the lint compartment
above the lint screen. This bracket consists of 2 devices.
One is a temperature sensor probe and the other is a high
limit thermostat, which is set at 225º F (107º C).
WARNING: Personal injury could result.
!
The information provided in this section should not be
misconstrued as a device for use by an untrained person
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 and serial numbers available.
CAUTION: Observe all safety precautions
displayed on the dryer or specified in this
manual before and while making repairs.
!
Before considering replacement, make sure that all
connectors are in place and making proper contact.
Lint Screen
The lint screen is located in the front of the dryer in the lint
coop assembly. To clean the lint off the screen simply
brush the screen clean. The lint screen must be kept clean
in order for the dryer to operate properly and efficiently.
Inspect the screen for tears and replace as needed.
Computer Controls
Microprocessor Computer Board Replacement
Discontinue electrical power to the dryer.
Unplug keypad ribbon from rear of the computer.
Unplug all wiring harnesses connected to the computer
board.
Lint Drawer Switch
The lint drawer switch is located in the lint compartment
and attached to the side of the lint coop. The lint door
switch ensures that the dryer will operate only when the lint
drawer is completely closed. This is a safety device and
should never be disabled.
Remove the 2 screws securing the computer to the
computer panel. Remove the computer by pulling the other
2 corners off the clinch studs.
Install new computer by reversing this procedure.
Keypad Label Assembly Replacement
Discontinue electrical power to the dryer.
Unplug keypad ribbon from rear of the microprocessor
computer.
Slowly peel off and remove keypad label assembly from
control panel.
Peel paper backing off new keypad label assembly.
Holding the new keypad label assembly close to the panel,
insert the keypad ribbon through the rectangular slot in the
control panel. Align label assembly into position by
matching the red viewing window on the label to the
rectangular cutout in the panel and gently press into place.
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Connect keypad ribbon to the computer.
Reestablish electrical power to the dryer.
The flame-probe, ignitor probe, and ground rod are all on
the same line of axis.
There should be a 1/8” gap (+/- 1/32) between the ignitor
probe and ground rod.
Microprocessor Temperature
Sensor Probe Replacement
Do not wrap the red high voltage wire and flame-probe
wire together. (Improper operation may result.) They may
run along side each other.
Discontinue electrical power to the dryer.
Remove perforated panel from tumbler.
Remove microprocessor sensor bracket assembly from
dryer.
Hot Surface Ignitor
Discontinue electrical power to the dryer.
Disconnect sensor bracket harness connector.
Disconnect the hot surface ignitor wires from S1 and ground
(GND) on the HSI module.
Loosen the 2 Phillips head screws, which secure bracket
assembly to dryer and remove bracket from dryer.
Disassemble hot surface ignitor probe from burner by
removing the one self-tapping screw.
NOTE: Do not remove screws.
Reverse procedure for installation of new hot surface ignitor.
Disassemble sensor probe from bracket assembly by
removing the top push-on fastener securing the probe from
bracket. Use a small screwdriver to slowly pry the fastener
off.
NOTE: Do not wrap the hot surface ignitor wires and the
flame electrode wire together. Improper operation may
result. They may run alongside each other.
Disconnect the 2 “orange” wires from the high heat (225º F
[107º C]) thermostat, and remove modular bracket
connector, wires, and probe from bracket assembly.
Reestablish electrical power to the dryer.
Gas Valve Replacement
Install new sensor probe assembly by reversing procedure.
Reestablish electrical power to the dryer.
Discontinue electrical power to the dryer.
Close shutoff valves in gas supply line.
Disconnect gas valve wiring.
NOTE: If, when electrical power is reestablished, the
microprocessor computer L.E.D. display reads “TEMP
SENSOR FAIL CHECK TEMP SENSOR FUSE,” check for
a loose connection in the wiring.
NOTE: Identify location of each wire for correct
reinstallation.
To Replace Spark Ignitor and Flame Probe
Discontinue power to the dryer.
Break union connection before gas valve.
Disconnect high voltage connector and flame-probe
connection from ignitor.
Loosen and remove 4 screws securing pipe brackets to
burner.
Disassemble ignitor from burner by removing the 2
self-tapping screws.
Remove valve and manifold assembly from dryer.
Remove valve mounting bracket, manifold and piping from
gas valve.
Reverse procedure for installing the new ignitor probe.
Reverse procedure for installing new gas valve.
NOTE: Before reestablishing power to the dryer, visually
check the following: (refer to the illustration).
WARNING: Test all connections for leaks by
brushing on a soapy water solution.
!
NEVER TEST FOR LEAKS WITH A FLAME!!!
Main Burner Orifices Replacement
Refer to “To Replace Gas Valve” and follow steps.
Unscrew main burner orifices and replace.
NOTE: Use extreme care when removing and replacing
orifices. These orifices are made of brass and are easily
damaged.
Reverse the removal procedure for reinstalling.
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WARNING: Test all connections for leaks by
Ignition Module Replacement
brushing on a soapy water solution.
Discontinue electrical power to the dryer.
!
NEVER TEST FOR LEAKS WITH A FLAME!!!
Remove the wires connected to the terminal strip at the
bottom of the module. (Mark correct location of each wire
to aid in replacement on new module).
To Convert Natural Gas to L.P. Gas
Remove the 2 pal nuts securing the module to the mounting
bracket.
NOTE: All dryers are sold as natural gas, unless
otherwise specified at the time the dryer order was
placed. For L.P. gas the dryer must be converted as
follows.
Replace module by reversing procedure.
Reestablish electrical power to the dryer.
Refer to “Replace Gas Valve” and follow steps.
For models with 3/4” White-Rodgers gas valve
• Remove top vent cap.
• Insert spring and pin.
• Replace vent cap.
Unscrew main burner orifices and replace with L.P. orifices.
NOTE: Use extreme care when removing orifices. They
are made of brass and are easily damaged.
Reverse the procedure for reinstalling valve assembly to
the dryer.
WARNING: Test all connections for leaks by
brushing on a soapy water solution.
!
NEVER TEST FOR LEAKS WITH A FLAME!!!
Thermostats
Burner Hi-Limit (330º F [166º C]) Thermostat
Replacement (Gas Models Only)
NOTE: There is no regulator provided in an L.P. dryer.
The water column pressure must be regulated at the
source (L.P. tank) or an external regulator must be added
to each dryer.
Discontinue electrical power to the dryer.
Disconnect wires from hi-limit thermostat.
Burner Tubes Replacement
Remove the 2 screws, washers and nuts securing
thermostat to the bracket. Remove thermostat.
Refer to “Replace Gas Valve” and follow steps.
Remove 4 screws securing the ignition module mounting
bracket.
Reversing procedure for installing new thermostat.
Reestablish electrical power to the dryer.
Remove front flanges of the burner tubes to the burner
tube rest.
Remove the screws securing the burner tube rest to the
oven and remove this rest.
Remove screws securing burner box cover plate to the
oven and remove the cover.
Remove burner tubes by sliding them out.
Replace by reversing procedure.
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Tumbler Hi-Limit Thermostat
(225º F [107º C]) Replacement
Sail Switch Adjustment
With the dryer operating at a high temperature setting, pull
the sail switch away from the burner. The sail switch should
open and extinguish the burner. Let the sail switch damper
return to the burner wall. The sail switch should close to
restart the burner ignition cycle. If the sail switch circuit
does not operate as described, bend the actuator arm of
the sail switch accordingly until proper operation is
achieved. To check proper “open” position of sail switch,
open main door, manually depress main door switch and
start dryer. With the main door open and the dryer operating,
the sail switch should be open, and the burner should not
come on.
Disconnect electrical power to the dryer.
Open lint door.
Locate sensor bracket assembly, remove the 2 nuts
securing bracket assembly to the tumbler wrapper.
Remove bracket assembly by slightly sliding bracket toward
the rear of the dryer and to the left.
Disconnect sensor bracket harness connector and remove
bracket assembly from dryer.
Disconnect the 2 “orange” wires from the thermostat.
Disassemble thermostat from bracket assembly by
removing the 2 mounting screws, washers and nuts.
Steam Damper Actuator System
Service and Replacement
Steam Damper Cylinder or Piston Replacement
Disconnect compressed air supply from the dryer.
Disconnect tubing from the piston.
Reverse this procedure for installing a hi-heat protector
thermostat.
Reestablish electrical power to the dryer.
Remove the spring clip from clevis pin then slide out the
clevis pin.
Remove the steam damper cylinder (piston).
To install new steam damper cylinder (piston), reverse
above procedure.
Steam Solenoid Valve Replacement
Disconnect compressed air supply from the dryer.
Discontinue electrical service to the dryer.
Disconnect wires in junction box.
Remove tubing from the inlet side of the valve.
Remove the valve from the bracket.
Unscrew the valve from the outlet side.
To install new steam solenoid valve, reverse above
procedure.
Sail Switch Assembly (Gas Models Only)
Sail Switch Replacement
Needle Valve Replacement
Discontinue electrical power to the dryer.
Disconnect compressed air supply from the dryer.
Remove tubing from the valve.
Remove the 2 screws, which hold the sail switch box cover
to sail switch box.
Disconnect the 2 wires from the switch.
Unscrew needle valve from the solenoid valve.
To install new needle valve, reverse above procedure.
Disassemble sail switch from mounting bracket by
removing the 2 screws securing switch in place.
Reverse this procedure for installing new sail switch. Adjust
sail switch as described in the next section.
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Steam Coil Replacement
WARNING: The 1/2” plug must be closed before
attempting to apply any steam pressure.
Discontinue electrical service to the dryer.
Disconnect compressed air supply from the dryer.
!
Slowly open the return line then slowly open the supply
line.
Shut off all steam supply lines and steam return valves
that feed the steam coil.
Wait a sufficient amount of time until all of the steam lines
and the steam coil is cool.
Open 1/2” plug on the return line to bleed off any residual
steam pressure.
CAUTION: Make certain that the entire steam
system (coil, lines, valves, etc.) are cooled to
avoid hot steam escaping and to avoid
personal injury.
!
Remove steam coil damper cylinder (piston).
Remove the steam coil damper by unbolting from its hinges.
Disconnect steam supply lines and steam return lines at
the unions.
Front Panel and Main Door Assemblies
Main Door Switch Replacement
Discontinue electrical power to the dryer.
Open main door.
Remove the 2 Phillips head screws holding the main door
switch bracket assembly in place.
Disconnect wiring from switch assembly.
Reverse this procedure for installing new door switch
assembly.
Reestablish electrical power to the dryer.
IMPORTANT: Under no circumstances should the door
switch be disabled.
Remove the remaining piping from the steam coil.
Remove all of the panels surrounding the steam coil.
Unbolt the steam coil and remove.
WARNING: The steam coil is heavy. A crane
may be needed to remove (and install) the
steam coil.
!
Remove the steam coil damper hinges from the old coil
and install them on the new steam coil.
Hoist the new steam coil into place and bolt down.
Replace all of the panels removed.
Reinstall all of the piping removed from the old steam coil.
NOTE: Thread sealant certified for steam piping must be
applied to the threads.
Reconnect all of the piping (supply lines and return lines)
disconnected.
Reinstall steam damper cylinder (piston) removed.
Reestablish electrical service to the dryer.
Close the 1/2” plug, which was opened.
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Main Door Assembly Replacement
IMPORTANT: When pulling the front panel off, the door
switch harness in the upper right hand corner must be
unplugged.
Open main door.
Holding the door upward remove the 2 screws from the top
hinge block.
NOTE: The main door assembly can be removed to
make the panel removal easier. Refer to “Replace Main
Door Assembly” directions.
Lift the door up to remove.
Reverse this procedure for reinstalling new main door
assembly.
Reinstall the new front panel by reversing the first step
through the fourth step.
To Install New Main Door Glass
Reestablish electrical power to the dryer.
Remove main door assembly from dryer (follow main door
removal procedure).
Pulleys
Lay main door on flat surface with the back of the door
facing down.
Drive Shaft Pulley Replacement
Discontinue electrical power to the dryer.
Remove rear belt guard.
Remove the 4 #10-32 acorn nuts securing the glass to the
door.
Loosen V-belts. Rotate pulley and roll V-belts out of
grooves.
Remove glass and clean all old sealant off main door.
This area must be clean for correct bonding.
Remove setscrew from the 9-inch (22.86 cm) pulley.
Remove pulley and key.
Place a bead of silicone around the edge door and lightly
press glass into place.
Reinstall the 4 #10-32 acorn nuts that were removed.
NOTE: A gear puller may be required to remove pulley.
Reverse this procedure for replacement.
IMPORTANT: Do not press hard or silicone thickness
between the glass and door will be reduced, resulting in
poor bonding.
NOTE: Pulley must be aligned for proper operation.
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 this adhesive is 24 to 48
hours.
After the curing period, install main door on dryer by
reversing the first step.
Drive Motor Pulley Replacement
Discontinue electrical power to the dryer.
Remove rear belt guard.
Loosen V-belts. Rotate pulley and roll V-belt out of groove.
Remove setscrew from the drive motor pulley.
Remove pulley and key.
Front Panel Replacement
Discontinue electrical power to the dryer.
Remove bottom lint drawer assembly.
Remove the screws securing the front panel to the dryer.
NOTE: A gear puller may be required to remove pulley.
Reverse this procedure for replacement.
NOTE: Pulleys must be aligned for proper operation.
American Dryer Corporation 450412-4
Disconnect the 2 door switch wires located behind the front
panel.
Remove the front panel.
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Tumbler Wheel Replacement
on Drive Assembly
Discontinue electrical power to the dryer.
Remove front panel from dryer. (Follow front panel
Remove the 10 1/4-20 x 1/4” socket button head screws
from the perforated basket side.
Remove wrapper assembly.
Loosen V-belt. Rotate pulley and V-belt out of the groove.
Block the tumbler assembly in position.
Remove the setscrew from the 9-inch (22.86 cm) pulley.
Remove the pulley and key.
IMPORTANT: Tighten screws evenly and progressively.
Never allow the sheave to be drawn in contact with the
flange of the bushing. This gap should measure from
1/8” to 1/4”. Proper cap screw torque is 30 ft-lb (41 Nm).
If greater tightening forces are applied, excess pressure
will be created in the hub of the mounted sheave, which
may cause it to crack.
Mark the position of pillow block bearing then remove the
bolts from the pillow block bearings.
Remove the drive shaft assembly through the front of the
machine.
Tumbler Wheel Replacement
on Idler Assembly
NOTE: A gear pulley may be required to remove the
pulley.
Disconnect electrical power to the dryer.
Remove cap screws from bushing.
Remove the front panel from the dryer. (Follow front panel
replacement directions on page 14.)
Insert cap screws in the tapped removal holes and tighten
evenly until bushing becomes loose on shaft.
Remove the 10 1/4-20 x 1/4” socket button head screws
from the perforated basket side.
Remove the bushing, tumbler wheel, and key.
Reverse this procedure for replacement.
Remove the wrapper assembly.
Block the tumbler assembly in position.
Mark the position of the pillow block bearings. Then remove
the bolts from the pillow block bearing.
Remove the idler shaft assembly through the front of the
machine.
Remove the cap screws from bushing.
Insert cap screws in the tapped removal holes and tighten
evenly until bushing becomes loose on shaft.
Remove the bushing, tumbler wheel, and key.
Reverse this procedure for replacement.
Basket Assembly Adjustment
NOTE: Dryer must be level prior to tumbler alignment.
Discontinue electrical power to the dryer.
Remove the perforated tumbler panel.
Remove wrapper panel to access the drive and idler shaft.
Place a level on the shafts to verify if level.
Measure distance between tumbler and wrapper 1/2” to
3/4” gap should be derived.
Loosen the 8 bolts on the pillow block bearings and turn
the adjustment screw clockwise or counterclockwise to
increase or decrease the gap between the tumbler and
wrapper.
Measure the length of the adjustment bolts and all should
be equal.
Place a level on the shaft to verify it is level if any adjustment
has been made.
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Check the basket drive belt for proper tension. Adjust if
necessary.
Replace the wrapper panels.
Replace the perforated tumbler panel.
1-15/16 (5 cm) Flange Bearing
Replacement
Disconnect electrical power to the dryer.
Remove the 4 bolts securing the bearing cap located in the
rear of the dryer. And remove.
Depress the tabs on the rotational sensor harness plug
and pull apart.
Remove the retaining ring from the tumbler shaft.
Remove the 4 bolts, lock washers and flat washers
securing the flange bearing to the dryer cabinet.
Depress the tabs on the rotational sensor harness plug
and pull apart, then remove the sensor switch.
Loosen the setscrews from the flange bearing.
To install a new sensor switch, connect the plug of the new
sensor switch to the sensor harness.
Remove the flange bearing from the tumbler shaft. (A
bearing puller may be necessary.)
Place one adjustment nut onto the sensor switch and insert
into the bearing cap.
To replace new flange bearing reverse steps.
Reestablish electrical power to the dryer.
Place the second adjustment nut on but do not tighten.
The magnet on the flange bearing and the sensor switch
must be in a horizontal line to one another.
4-inch Support Wheel Replacement
Disconnect electrical power to the dryer
The gap between the magnet and the sensor switch must
be 1/8-inch.
Remove the four nuts securing the rear support box to the
dryer.
Tighten the adjustment nuts installed.
Reestablish electrical power to the dryer.
Remove the center allen head bolt and teflon washer.
Loosen the individual wheel bolts so the rear of the box
can be removed.
Idler Shaft Pillow Block
Bearing Replacement
Refer to tumbler wheel replacement on idler assembly
Remove the damaged wheel.
Replace with new wheel.
Reverse steps to replace support box.
Complete all the steps.
Remove both setscrews from each pillow block bearing.
Remove pillow block bearing from shaft.
Reverse this procedure for replacement.
NOTE: make sure inner teflon disc does not fall off of
center allen head bolt.
Rotational Sensor Assembly
NOTE: Once the shaft assembly has been installed into
dryer, return pillow block bearings to the marked position
and tighten setscrews.
The rotational sensor assembly is located in the rear of
the dryer. It consists of a magnet. Rotational sensor switch,
which is mounted to the bearing cap. The magnet is
screwed into the 1-15/16” (5 cm) flange bearing on
machines made with a bearing or directly attached to the
shaft on machines made with 4-inch (10.16 cm) shaft
support rollers.
Refer to basket assembly section page 15 for shaft and
basket alignment.
Drive Assembly Pillow Block
Bearing Replacement
Refer to tumbler wheel replacement on drive assembly
The magnetic rotational sensor switch senses the rotation
of the tumbler. If the gap between the sensor switch and
the magnet is greater than a preset amount or if the tumbler
stops turning, then the dryer will shut down on “SEFL”
(“rotational sensor failure”).
Complete all the steps.
Remove both setscrews from each pillow block bearing.
Remove pillow block bearings from shaft.
Reverse this procedure for replacement.
Rotational Sensor Switch Replacement
Discontinue electrical power to the dryer.
Remove the bearing cap from the dryer.
Remove the adjustment nut from the bearing cap.
NOTE: Once the shaft assembly has been installed into
dryer, return pillow block bearing to the marked position
and tighten setscrews.
Remove the magnetic rotational sensor switch from the
bearing cap.
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basket alignment.
V-Belt Adjustment (Motor to Drive Axle)
Discontinue electrical power to the dryer.
Remove the belt guard cover from the rear of the dryer.
Loosen the 4 bolts holding the drive motor mount to the
side of the dryer.
Loosen the jam nuts on the adjustment screw on the top of
the motor mount.
Turn the adjustment screw to lower the motor mount (to
tighten the belts) or raise the motor mount (to loosen the
belts.)
Check the vertical plane of the motor and idler pulleys for
parallel adjustment.
If realignment is required, loosen motor pulley and bushing,
and move motor pulley to proper position.
Retighten motor mount bolts and jam nuts.
Reestablish electrical power to the dryer.
Motorized Impellor (Blower) Replacement
Discontinue electrical power to the dryer.
Remove lint draw.
Drive Motor V-Belts Replacement
Remove the perforated panel inside the tumbler.
Remove the bolts securing the inlet cone.
Remove the inlet cone.
Discontinue electrical power to the dryer.
Remove the belt guard cover from the rear of the dryer.
Loosen tension on V-belt so that it can easily be rolled off
pulley. This can be done by loosening the 4 bolts holding
the motor to the side of the dryer, as well as the adjustment
bolt on top.
Remove the bolts securing the motor plate to the dryer
cabinet.
Remove the motorized impellor along with the motor plate.
Replace V-belt.
Retighten V-belt and adjust tension and alignment per
previous instructions.
Motors
Drive Motor Replacement
Discontinue electrical power to the dryer.
Remove the belt guard cover from the rear of the dryer.
Remove drive belt.
Disconnect wiring harness from motor.
Remove bolts holding motor to mount and replace with
new motor. Do not tighten bolts.
Remove pulley from old motor and install on new motor.
By removing the setscrew from the drive motor pulley.
NOTE: A gear puller may be required to remove pulley.
Align motor pulley with drive assembly pulley and tighten
setscrew holding motor pulley.
NOTE: The motorized impellor assembly will not be
able to be removed due to the wiring harness still
connected.
Replace belts and adjust belt tension.
Retighten bolts.
Reestablish electrical power to the dryer.
Disconnect the wiring harness from motor.
Remove the motor plate from the motorized impellor and
install it on the new motor.
Reconnect the wiring harness to the motor.
To replace new motorized impellor assembly, reverse steps.
Reestablish electrical power to the dryer.
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Lint Door Switch Replacement
Discontinue electrical power to the dryer.
Remove the lint door panel. (For the ML-122.)
Remove the front panel. (For the ML-96.)
No L.E.D. display on microprocessor
controller (computer)...
Open circuit breaker switch or blown fuse.
Tripped blower motor overload.
Faulty wiring connection.
Disconnect both 4-pin connectors at the rear of the lint
switch cover.
Faulty transformer.
Remove the 2 screws holding the lint switch cover on.
“Emergency Stop” (E-Stop) button is depressed.
Faulty microprocessor controller (computer).
Remove the lint switch cover and disconnect the 2 terminals
of the switch.
Remove switch by pressing tabs together and pushing
switch out.
Computer will not accept keypad entries...
Keypad ribbon is not plugged into computer securely.
Faulty keypad.
Install new switch by reversing these procedures.
Faulty microprocessor controller (computer).
Dryer will not start, but computer
L.E.D. indicators are on...
Failed contactors.
Failed arc suppressor board.
Failed microprocessor controller (computer).
Failed motors.
Blower motor runs, burner is on,
but tumbler will not turn...
Broken, damaged or loose V-belt.
Damaged or misadjusted drive wheels.
Loose or broken pulley.
Dryer operates but is taking
too long to dry...
Troubleshooting _____________________
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.
Improperly programmed microprocessor controller
(computer).
An inadequate exhaust ductwork system.
Restriction in exhaust system.
Insufficient make-up air.
Dirty or clogged lint screen.
The information provided will help isolate the most
probable component(s) associated with the difficulty
described. The experienced technician realizes, however,
that a loose connection or broken/shorted wire may be at
fault where electrical components are concerned...and not
necessarily the suspected component itself.
Washing machine extractors are not performing properly.
The supply gas may have a low heating value, check with
local gas supplier.
Failed temperature sensor (temperature calibration is
incorrect).
IMPORTANT: When replacing blown fuses, the
replacement must be of the exact rating as the fuse
being replaced. The information provided should not be
misconstrued as a handbook for use by an untrained
person in making repairs.
Failed microprocessor controller (computer).
Thermal overload for drive motor
is tripping...
Either an exceptionally low or high voltage supply.
WARNING:All service and troubleshooting
should be performed by a qualified
professional or service agency.
Motor bearing failure.
!
Motor vents are blocked with lint.
Failed motor.
While making repairs, observe all safety precautions
displayed on the dryer or specified in this manual.
Failed overload.
Insufficient make-up air.
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Overload for impellor (fan) motor
is tripping...
Phase 6 OPL System Diagnostics ___
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.
Either an exceptionally low or high voltage supply.
Motor bearing failure.
Motor vents are blocked with lint.
Failed motor.
Failed overload.
All major circuits, including door, microprocessor
temperature sensor, heat and motor circuits are monitored.
The Phase 6 OPL microprocessor controller (computer)
will inform the user, via the L.E.D. display of certain failure
codes, along with indicators both in L.E.D. display and at
the output of each relay (and door switch circuit) to easily
identify failures.
Out of balance impellor (fan).
Insufficient make-up air.
Burner hi-limit safety thermostat
is tripping...
Insufficient exhaust ductwork, size or restriction in exhaust
system.
Diagnostic (L.E.D. Display) Failure Codes
SAIL SWITCH FAIL – This routine will prevent start up on
the machine unless the sail switch is in the correct position.
If the sail switch is closed prior to start up the display will
read “SAIL SWITCH FAIL” along with an audio indication.
Insufficient make-up air.
Lint screen needs cleaning.
Damaged impellor.
No AIRFLOW – If the sail switch opens during cycle
operation the display will read “No AIRFLOW” along with
an audio indication. The machine will continue to run with
no heat for 3 minutes or until the temperature drops below
100º F (38º C). Upon failure the machine will shut down
and display “No AIRFLOW” with an audio indication.
L.E.D. display reads “Temp Sensor Failure
Check Temp Sensor Fuse.” or “Open
Exhaust Temperature Probe.”...
Check 1/8-amp fuse on microprocessor controller
(computer). (Phase 6 units only.)
bURNER SAFETY FAIL – Routine monitors the temperature
above the burner. If the burner hi-limit switch opens the
display will read “bURNER SAFETY FAIL.” The machine
will run with no heat for 3 minutes or until the temperature
drops below 100º F (38º C). Upon failure the machine will
shut down and display “bURNER SAFETY FAIL” with an
audio indication.
Faulty microprocessor controller (computer) temperature
sensor probe.
Open circuit or short in either one of two wires leading from
the sensor probe to the computer...
Faulty microprocessor controller (computer).
dRUM SAFETY FAIL – This routine monitors the tumbler
temperature if the tumbler hi-limit switch opens prior or
during the cycle while the heat was on the machine will
display “dRUM SAFETY FAIL.” The machine will continue
to run with no heat for 3 minutes or until the temperature
drops below 100º F (38º C). Upon failure the machine will
shut down and display “dRUM SAFETY FAIL” with an audio
indication.
Dryer does not start.
Display reads “main door” or “lint door”
with an audio indication...
Main door is open.
Lint drawer is open.
Faulty main door or lint door switch.
No HEAT – This routine monitors the burner ignition. If the
burner misignites (does not light) the ignition module will
check to see of the microprocessor program has any retries
left. The standard retry count is 2. If the module notices
that there are retries left it will purge for 1 minute then try to
ignite the burner again. The ignition module will try this for
a total of 3 times or until there are no retries left. If the
burner does not ignite after 3 attempts the L.E.D. display
will display the error code “no heat” with an audio indication.
When this occurs the machine will run with no heat for 3
minutes or until the temperature drops below 100º F
(38º C).
Open circuit in either main door or lint drawer switch
harnesses.
Faulty 24 VAC transformer.
There is excessive vibration coming
from the tumbler...
Tumbler is out of adjustment.
Drive shaft or idler shaft is out of alignment.
Faulty pillow block bearing or 4-inch (10.16 cm) rear wheel.
Faulty tumbler wheel.
IMPORTANT: For other countries, such as Australia, the
retry count may not apply due to local approvals.
Drive motor and shaft not aligned.
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bURNER CONTROL FAIL – This routine monitors the ignition
control’s gas valve output response. If the valve output
signal is not present from the ignition control within the
valve time limits the Phase 6 microprocessor controller
(computer) determines the ignition control has failed. If
this occurs when the cycle is active the machine will display
“bURNER CONTROL FAIL.” If the tumbler temperature is
above 100º F (38º C) the machine will continue to display
“bURNER CONTROL FAIL.” The machine will run with no
heat for 3 minutes or until the temperature drops below
100º F (38º C). If the tumbler temperature is below 100º F
(38º C) upon failure the machine will shut down and display
“bURNER CONTROL FAIL” with an audio indication.
ROTATE SENSOR FAIL – Indicates a rotational sensor circuit
failure meaning that there is a fault somewhere in the
tumbler rotating circuit, or the Phase 6 OPL microprocessor
controller (computer) program related to this circuit
(program location 2) is set incorrectly. In the active mode it
should be (ROTATE SENSOR ACTIVE), if the dryer is not
equipped with the optional rotational sensor it should be
set in the nonactive mode (No ROTATE SENSOR).
NOTE: RPM – This routine monitors the timing response
from the existing rotational sensor input and derives a
RPM measurement. To display this RPM measurement
(press the “ENTER/START” key once and release, then
press the “ENTER/START” key a second time and hold.
This will display the RPM measurement). The rotational
sensor must be active for operation of this feature.
bURNER FLAME FAIL – This routine allows 2 flame out
retries to occur before proceeding into the error. The count
of 2 will be established every time the call for heat was to
occur. Only if it reaches the count of 2 before the tumbler
temperature has reached the set temperature will this error
be triggered. The machine will run with no heat for
3 minutes or until the temperature drops below 100º F
(38º C). If the tumbler temperature is below 100º F (38º C)
upon failure, the machine will shut down and display
“bURNER FLAME FAIL” with an audio indication. This
process will occur every time the heat output is active.
CHECK MAIN FUSE – Indicates that the circuit fuse
protection, which is located on the back side of the Phase
6 microprocessor controller (computer) the display would
read “CHECK MAIN FUSE.” If the display continues after
the fuse has been replaced then it is the fault of the Phase
6 microprocessor controller (computer).
L.E.D. Display Indicators
MAIN DOOR – This monitors the door circuit. If the machine
was not active and the main door was opened the display
would read “REAdY.” If a program attempt was made with
the main doors open the display will read “MAIN dOOR”
with an audio indication. If the machine is active and the
main door was opened the display would read “MAIN
dOOR” with no audio indication and the dryer will shut down.
Once the main door has closed the display would read
“PRESS START” press the “ENTER/START” key and it will
continue the programmed cycle.
The L.E.D. indicator dots located on the top portion of the
display indicates various Phase 6 OPL computer output
functions while a cycle is in progress. These indicator
dots (as shown in the illustration below) do not necessarily
mean that the outputs are functioning. They are only
indicating that the function output should be active (on).
L.E.D. Display Indicator Number 1
LINT dOOR – This monitors the lint drawer and door circuit.
If the machine was not active and the lint drawer and door
was opened the display would read “REAdY.” If a program
attempt was made with the lint drawer and door open the
display would read “LINT dOOR” with an audio indication.
If the machine is active and the lint drawer and door was
opened the display would read “LINT dOOR” with no audio
indication and the dryer will shut down. Once the lint door
was closed the display would read “PRESS START” press
the “ENTER/START” key and it will continue the
programmed cycle.
For Optional Reversing Models: This indicator dot is on
when the drive (tumbler) motor is operating in the forward
mode (clockwise direction).
TEMP SENSOR FAIL CHECK TEMP SENSOR FUSE – This
routine monitors the tumbler temperature. When the
temperature sensor or fuse opens with the machine not
active the display will read “TEMP SENSOR FAIL CHECK
TEMP SENSOR FUSE” with an audio indication. If the
machine was active at the time that the temperature sensor
or fuse opened the display would read “TEMP SENSOR
FAIL CHECK TEMP SENSOR FUSE.” The display will
continue to read “TEMP SENSOR FAIL CHECK TEMP
SENSOR FUSE” an audio indication will sound for
approximately 5-seconds, every 30-seconds until the
problem is corrected or the power to the dryer is
disconnected (and the problem is corrected).
L.E.D. Display Indicator Number 2
For Optional Reversing Models: This indicator dot is on
when the drive (tumbler) motor is operating in the reverse
mode (counterclockwise direction).
L.E.D. Display Indicator Number 3
Heat Circuit Indicator: This indicator dot is on whenever
the Phase 6 OPL microprocessor controller (computer) is
calling for the heating circuit to be active (on).
NOTE: Once the Phase 6 microprocessor controller
(computer) detects a problem in the heat circuit, it
updates every 30-seconds, so that if the problem was a
loose connection in the circuit, which corrected itself, the
“TEMP SENSOR FAIL CHECK TEMP SENSOR FUSE”
condition would automatically be cancelled and the
display will return to “REAdY.”
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L.E.D. Display Indicator Number 4
If the motor is not operating. The fan indicator dot and
output L.E.D. are also on, then the problem (fault) is
On Indicator: This indicator dot is on whenever a cycle is in
progress. Additionally, when the Anti-Wrinkle program is
active, the indicator dot will be on whenever the Phase 6
OPL microprocessor controller (computer) is in the Guard
On Time program.
elsewhere (i.e., external of the Phase
microprocessor controller [computer]).
6
OPL
“FOR” (FORWARD) Output L.E.D. Indicator
(for optional reversing model ONLY)
L.E.D. Display Indicator Number 5
If the dryer is started and the blower motor is operating, but
the drive (tumbler) motor is not, yet the Phase 6 OPL
microprocessor controller (computer) display “FORWARD”
indicator dot is on, the “FOR” (FORWARD) motor output
L.E.D. is off; then the fault is the Phase 6 OPL
microprocessor controller (computer) itself.
Air Jet Circuit – OPTIONAL: This indicator dot is on at the
end of the dryer cycle for approximately 60-seconds.
Phase 6 OPL Microprocessor Controller
(Computer) Relay Output L.E.D. Indicators
If the drive tumbler motor is not operating and the forward
indicator dot and output L.E.D. is on; then the problem (fault)
is elsewhere (i.e., external of the Phase 6 OPL
microprocessor controller [computer]).
There are a series of 5 L.E.D. indicators (ORANGE LIGHTS)
located at the backside of the Phase 6 OPL microprocessor
controller (computer). These are identified or labeled (from
top to bottom in the illustration below as: FAN-BLOWER,
FOR-FORWARD, REV-REVERSE, AIR-AIR-JET, HT1-HEAT
OUTPUT. There are a series of 7 L.E.D. indicators (red
lights) FUSE-MAIN FUSE, LINT-LINT DOOR, MAIN-MAIN
DOOR, DRUM-TUMBLER HI-LIMIT, SAIL-SAIL SWITCH,
BURN-BURNER HI-LIMIT, FLAME-FLAME PROBE). The
L.E.D. in the center of the board (red light) indicates power
supplied to the Phase 6 OPL microprocessor controller
(computer). These L.E.D.’s indicate the inputs and outputs
of the Phase 6 OPL microprocessor (computer) as it
monitors the safety circuits.
“REV” (REVERSE) Output L.E.D. Indicator
(for optional reversing models ONLY)
If the dryer is started and the blower motor is operating but
the drive tumbler motor is not, yet the Phase 6 OPL
microprocessor controller (computer) displays “REVERSE”
indicator dot is on but the “REV” (REVERSE) motor output
L.E.D. is off; then the fault is of the Phase 6 OPL
microprocessor controller (computer) itself.
If the drive tumbler motor is not operating and reverse
indicator dot and output L.E.D. is on; then the problem (fault)
is elsewhere (i.e., external of the Phase 6 OPL
microprocessor controller [computer]).
“AIR” (AIR JET) Output L.E.D. Indicator – OPTIONAL
“AIR” is on with the display dot at the end of the dry cycle
once the display reads “dONE,” it is on for approximately
60-seconds and the output L.E.D. indicator and the display
dot go out. If the air jet does not energize it is not the fault
of the Phase 6 OPL microprocessor controller (computer).
If the output L.E.D. or dot do not go on it is the fault of the
Phase 6 OPL microprocessor controller (computer).
“HT1” (HEAT) Output L.E.D. Indicator
If the dryer is started and there is “No Heat” yet the Phase
6 OPL microprocessor controller (computer) display heat
circuit indicator dot is on, but the “HT1” output L.E.D.
indicator is off; then the fault is in the Phase 6 OPL
microprocessor controller (computer) itself.
If the dryer is started and there is “No Heat” yet both the
Phase 6 OPL microprocessor controller (computer) display
indicator dots and the “HT1” output L.E.D. indicator are on;
then the problem (fault) is elsewhere (i.e., external of the
Phase 6 OPL microprocessor controller [computer]).
“FUSE” (MAIN FUSE) Input L.E.D. Indicator
Should be on all the time (even if the dryer is not running).
If the L.E.D. is not on; then the display will read “CHECK
MAIN FUSE.” If the main fuse is good then the fault is on
the Phase 6 microprocessor controller (computer).
“FAN” (BLOWER) Output L.E.D. Indicator
If the dryer is started and the blower motor is not operating,
yet the Phase 6 OPL microprocessor controller (computer)
display fan indicator dot and power supply input L.E.D. are
on, but the fan output L.E.D. is off, then the fault is the
Phase 6 OPL microprocessor controller (computer) itself.
“LINT” (LINT DOOR) Input L.E.D. Indicator
Should be on all the time (unless the lint door is opened
then the “LINT” L.E.D. indicator will go out).
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If the dryer is active (running) and the lint door is opened
the “LINT” L.E.D. indicator will go out and the display will
read “LINT dOOR.” The dryer will stop until the lint drawer
has been closed, at which time the L.E.D. display will read
“PRESS START.” At this time, to resume the drying cycle
press “ENTER/START” key.
“POWER SUPPLY” Input L.E.D. Indicator
Should be on at all times (even if the dryer is not running).
The power supply L.E.D. output indicator will not be on if
the power supply fuse to the Phase 6 OPL microprocessor
is not present. If the power supply fuse is faulty the L.E.D.
output will be off and there will be no display or keypad
function. The “FUSE,” “LINT,” and “DRUM” output L.E.D.
indicators will remain on.
“MAIN” (MAIN DOOR) Input L.E.D. Indicator
Should be on all the time (unless the lint door is open or
the main door is opened then the “MAIN” L.E.D. indicator
will go out).
Phase 7 OPL System Diagnostics ___
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.
If the dryer is active (running) and the main door is opened
the “MAIN” L.E.D. indicator will go out and the display will
read “MAIN dOOR.” The dryer will stop until the main door
has been closed, at which time the L.E.D. display will read
“PRESS START.” At this time, to resume the drying cycle
press “ENTER/START” key.
All major circuits, including door, microprocessor
temperature sensor, heat and motor circuits are monitored.
The Phase 7 OPL 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 Input/Output
board on the back panel of the front right control door.
“DRUM” (TUMBLER HI-LIMIT) Input L.E.D. Indicator
Should be on at all times (unless the tumbler hi-limit switch
opens prior during the cycle while the heat was on the
display would read “dRUM Safety FAIL”). The machine will
run with no heat for 3 minutes or until the temperature
drops below 100º F (38º C). Then the machine will shut
down still displaying “dRUM SAFETY FAIL” with an audio
indication.
Diagnostic (L.E.D. Display) Fault Messages
MAIN DOOR OPENED –Amain door is open, when it should
be closed.
“SAIL” (SAIL SWITCH) Input L.E.D. Indicator
EXHAUST HIGH TEMP FAULT – Indicates the temperature
This routine will prevent start up on the machine unless
the sail switch is in the correct position. If the sail switch is
in the closed position prior to start, the “SAIL” output L.E.D.
indicator will be off, the machine will not start and the display
will read “SAIL SWITCH FAIL” along with an audio indication.
in the tumbler is above 220º F (104º C).
LINT ACCESS OPEN – Indicates the lint drawer is open
and needs to be closed.
EXHAUST HIGH LIMIT FAULT – Indicates the temperature
disk in the exhaust has opened.
If the sail switch opens during the cycle the “SAIL” output
L.E.D. will go out and the display will read “NO AIRFLOW.”
The machine will run with no heat for 3 minutes or until the
temperature drops below 100º F (38º C). Then the machine
will shut down still displaying “NO AIRFLOW” along with an
audio indication.
SAIL SWITCH CLOSED FAULT – Sail switch is closed and
should be opened.
SAIL SWITCH OPEN FAULT – Sail switch is open and should
be closed.
BURNER HIGH LIMIT FAULT – Indicates the temperature
disk in the burner has opened.
“BURN” (BURN HI-LIMIT) Input L.E.D. Indicator
BURNER IGNITION CONTROL FAULT – No signal to gas
This routine monitors the temperature of the burner. If the
burner hi-limit opens during the cycle while the heat was
on the “BURN” output L.E.D. indicator goes out and the
display reads “bURNER SAFETY FAIL.” The machine will
run with no heat for 3 minutes or until the temperature
drops below 100º F (38º C) then the machine will shut
down still displaying “bURNER SAFETY FAIL” with an audio
indication.
valve from DSI module during trial for ignition time.
IGNITION FAULT – Gas valve did not remain open after trial
for ignition. Indicates that no flame was detected.
FLAME FAULT – Indicates flame was detected during trial
for ignition, but failed sometime after. This condition must
reoccur for 5 retries before fault occurs.
ROTATION FAULT – Indicates the tumbler is not rotating.
OPEN EXHAUST TEMPERATURE PROBE – Indicates the
exhaust temperature probe is open or shorted.
“FLAME” (bURNER CONTROL FAIL) Input L.E.D. Indicator
This routine monitors the ignition control’s gas valve output
response. If the valve output signal is not present from the
ignition control within the valve time limits the
microprocessor determines the ignition control has failed.
If this occurs when the cycle is active the “FLAME” output
L.E.D. indicator will go out and the display will read
“bURNER CONTROL FAIL.” The machine will run with no
heat for 3 minutes or until the temp drops below 100º F
(38º C). Then the machine will shut down still displaying
“bURNER CONTROL FAIL” with an audio indication.
OPEN S.A.F.E. SYSTEM PROBE FAULT – Indicates the
temperature probe for the S.A.F.E. system is open or
shorted.
LOW VOLTAGE FAULT – Indicates power has dropped
below the operating values and will shutdown.
BURNER PURGE FAULT – The gas valve signal is present
during the prepurge time.
MODEL ERROR, ENTER CORRECT MODEL – The wrong
model was selected for the dryer.
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American Dryer Corporation
450412-4
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EE PROM FAULT ### – Error in memory location. The ###
indicates the location of the fault.
Data Label ___________________________
Contacting American Dryer Corporation
Input/Output Board L.E.D. Indicators
Inputs
ESTOP – (RED L.E.D.): This L.E.D. will indicate the status of
the E-STOP. If the E-STOP has been pressed, then the
L.E.D. is on.
GAS_V – (RED L.E.D.): 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.
BRHL – (RED L.E.D.): This L.E.D. will indicate the status of
the burner high limit disk. If the disk is closed (temperature
below 330º F [166º C]), then the L.E.D. is ON.
SAIL – (RED L.E.D.): This L.E.D. will indicate the status of
the sail switch. If the switch is closed, then the L.E.D. is
ON.
EXHL – (RED L.E.D.): This L.E.D. will indicate the status of
the exhaust high limit disk. If the disk is closed
(temperature below 225º F [107º C]), then the L.E.D. is ON.
When contacting ADC, certain information is required to
ensure proper service and parts information. This
information is on the data label, located on the top right
corner of the dryer, viewed from the rear (refer to illustration).
When contacting ADC, please have the model number and
serial number readily accessible.
MAIN – (RED L.E.D.): This L.E.D. will indicate the status of
the main door. If the door is closed, then the L.E.D. is ON.
LINT – (RED L.E.D.): This L.E.D. will indicate the status of
the lint drawer. If the drawer is closed, then the L.E.D. is
ON.
Information on the Data Label
FUSE – (RED L.E.D.): This L.E.D. will indicate the status of
the control voltage.
a. Model Number – The model number is an ADC number,
which describes the size of the dryer and the type of
heat (gas or steam).
Outputs
b. Serial Number – The serial number allows ADC to
STEAM – (GREEN L.E.D.): This L.E.D. will indicate the status
of the steam injection output. If the request to turn on the
steam injection is made, then the L.E.D. is ON.
gather information on your particular dryer.
c. Manufacturing Code Number – The manufacturing
code number is a number issued by ADC, which
describes all possible options on your particular
model.
_HEAT – (GREEN L.E.D.): This L.E.D. will indicate the status
of the heat output. If the request to turn on the heater is
made, then the L.E.D. is ON.
d. Type of Heat – Describes the type of heat; gas (natural
AIR – (GREEN L.E.D.): This L.E.D. will indicate the status of
the air jet output. If the request to turn on the air jet is made,
then the L.E.D. is ON.
or L.P.), steam or electric.
e. Heat Input (For gas dryers) – Describes the heat input
in British Thermal Units.
REV – (GREEN L.E.D.): This L.E.D. will indicate the status of
the tumbler reverse direction output. If the request to tumble
the drum in the reverse direction is made, then the L.E.D.
is ON.
f.
Electric Service – Describes the electric service for
your particular models.
g. Gas Manifold Pressure – Describe the manifold
pressure as taken at the gas valve pressure tap (refer
to “Using a Manometer”).
FWD – (GREEN L.E.D.): This L.E.D. will indicate the status
of the tumbler forward direction output. If the request to
tumble the drum in the forward direction is made, then the
L.E.D. is ON.
FAN – (GREEN L.E.D.): This L.E.D. will indicate the status of
the fan output. If the request to turn on the fan (blower) is
made, then the L.E.D. is ON.
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How to Use a Manometer
With dryer in nonoperating mode, remove plug on the gas
valve pressure tap.
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Attach plastic tubing to pressure tap. Fitting is supplied
with manometer (refer to illustration).
Attach manometer to dryer using magnet.
NOTE: Place manometer in a position so that readings
can be taken at eye level.
Fill manometer with water, as shown in illustration to the
zero level.
Start dryer. With burner on, take a reading.
Read water level at the inner tube. Readings should be
taken at eye level.
Correct readings should be:
Natural Gas: ______ 3.5 in wc (8.7 mb).
L.P. Gas: _________ 10.5 in wc (26.1 mb).
If water column pressure is incorrect refer to “TO ADJUST
GAS PRESSURE.”
Reverse procedure for removing manometer.
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American Dryer Corporation
450412-4
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ADC Part No. 450412
4 - 01/02/08 - 0
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