ADC AD-360X2 Clothes Dryer User Manual

AD-360X2
Mechanical/Electrical
Service Procedure
American Dryer Corporation
88 Currant Road
Fall River, MA 02720-4781
Telephone: (508) 678-9000 / Fax: (508) 678-9447
e-mail: techsupport@amdry.com
www.amdry.com
101802SRS/wmarelli
ADC Part No. 450213
Retain This Manual In A Safe Place For Future Reference
American Dryer Corporation products embody advanced concepts in engineering, design, and safety. If this product is
properly maintained, it will provide many years of safe, efficient, and trouble free operation.
ONLY qualified technicians should service this equipment.
OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation manual included with
the dryer.
The following “FOR YOUR SAFETY” caution must be posted near the dryer in a prominent location.
FOR YOUR SAFETY
POUR VOTRE SÉCURITÉ
Do not store or use gasoline or
other flammable vapors and
liquids in the vicinity of this or
any other appliance.
Ne pas entreposer ni utiliser d’essence
ni d’autres vapeurs ou liquides
inflammables à proximité de cet
appareil ou de tout autre appareil.
We have tried to make this manual as complete as possible and hope you will find it useful. ADC 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.
Important
For your convenience, log the following information:
DATE OF PURCHASE ____________________________
MODEL NO.
AD-360X2
__________________________________________
RESELLER’S NAME _______________________________________________________________________________________
Serial Number(s)
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
Replacement parts can be obtained from your reseller or the ADC factory. When ordering replacement parts from the factory,
you can FAX your order to ADC at (508) 678-9447 or telephone your order directly to the ADC Parts Department at (508)
678-9000. Please specify the dryer model number and serial number in addition to the description and part number, so that
your order is processed accurately and promptly.
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.
“IMPORTANT NOTE TO PURCHASER”
Information must be obtained from your local gas supplier on the instructions
to be followed if the user smells gas. These instructions must be posted in a
prominent location near the dryer.
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 (Occupational Safety and Health Administration)
STANDARDS.
FOR YOUR SAFETY
DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE
VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER
APPLIANCE.
DO NOT DRY MOP HEADS IN THE DRYER.
DO NOT USE DRYER IN THE PRESENCE OF DRY CLEANING FUMES.
CAUTION
DRYERS SHOULD NEVER BE LEFT UNATTENDED WHILE IN
OPERATION.
WARNING
CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR
THE DRYERS.
CHILDREN SHOULD BE SUPERVISED IF NEAR DRYER(S) IN
OPERATION.
WARNING
The dryer must never be operated with any of the back guards or service
panels removed. PERSONAL INJURY OR FIRE COULD RESULT.
WARNING
DRYER MUST NEVER BE OPERATED WITHOUT THE LINT
FILTER OR SCREEN IN PLACE, EVEN IF AN EXTERNAL LINT
COLLECTION SYSTEM IS USED.
IMPORTANT
PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the
equipment and specified in the installation manual included with the dryer.
The wiring diagram for the dryer is located behind the left front control panel.
Table of Contents
SECTION I
IMPORTANT INFORMATION ............................................................................... 3
A. Safety Precautions ...................................................................................................................... 3
SECTION II
ROUTINE MAINTENANCE .................................................................................... 4
A. Cleaning ..................................................................................................................................... 4
B. Adjustments ............................................................................................................................... 5
SECTION III
INSTALLATION REQUIREMENTS ...................................................................... 6
A. Enclosure, Air Supply, and Exhaust Requirements ........................................................................ 6
B. Electrical and Gas Requirements ................................................................................................. 7
C. Operational Service Check Procedure ........................................................................................ 8
SECTION IV
DESCRIPTION OF PARTS ...................................................................................... 9
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
K.
L.
M.
N.
O.
P.
Q.
R.
Control Panel ............................................................................................................................. 9
Control and Relay Panels ............................................................................................................ 9
Coin Box .................................................................................................................................... 9
Door Switch (Hinge Block) ....................................................................................................... 10
Microprocessor Assembly ........................................................................................................ 10
Basket (Tumbler) ...................................................................................................................... 10
Basket (Tumbler) and Drive Motor Assembly Arrangement ........................................................ 10
Idler Arm and Impellor Mount Assembly ................................................................................... 11
Drive Motor and Idler Pulley Arrangement ................................................................................ 11
Temperature Sensors ................................................................................................................ 11
Gas Burner ............................................................................................................................... 12
Sail Switch ............................................................................................................................... 12
Hi-Limit Thermostat .................................................................................................................. 12
Lint Drawer Switch ................................................................................................................... 13
Lint Drawer .............................................................................................................................. 13
Front Thruster Wheel Bracket Assembly ................................................................................... 13
Rear Basket (Tumbler) Drive Wheels ........................................................................................ 14
Rotational Sensor Assembly ...................................................................................................... 14
SECTION V
SERVICE ................................................................................................................... 15
A.
B.
C.
D.
E.
F.
Introduction .............................................................................................................................. 15
Controls (Computer) ................................................................................................................ 15
Burner Controls (Gas) .............................................................................................................. 19
Thermostats and Temperature Sensor ........................................................................................ 22
Sail Switch Assembly ................................................................................................................ 24
Front Panel and Main Door Assemblies ..................................................................................... 25
SECTION VI
BCD-1 TYPE MODULE .......................................................................................... 29
A.
B.
C.
D.
Introduction .............................................................................................................................. 29
General System Information ...................................................................................................... 29
G-760 Direct Spark Ignition (DSI) Flowchart ........................................................................... 32
Troubleshooting ........................................................................................................................ 33
SECTION VII
TROUBLESHOOTING ........................................................................................... 47
A.
B.
C.
D.
E.
F.
Phase 5 Coin System Diagnosis ................................................................................................ 47
No Heat Condition (Blower is On) ............................................................................................ 50
No Start Condition ................................................................................................................... 52
No Display Condition ............................................................................................................... 53
“dSFL” Display Condition ........................................................................................................ 54
“dOOr” Display Condition ........................................................................................................ 55
SECTION VIII
DATA LABEL INFORMATION ............................................................................. 56
A. Data Label ............................................................................................................................... 56
B. Using a Manometer .................................................................................................................. 57
C. Light Emitting Diode (L.E.D.) Display Codes ............................................................................ 58
SECTION I
IMPORTANT INFORMATION
A. SAFETY PRECAUTIONS
1. DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
2. Purchaser and/or 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. Dryer(s) 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.
WARNING: DO NOT dry rags or articles coated or contaminated with gasoline, kerosene, oil, paint,
or wax. EXPLOSION COULD RESULT.
WARNING: DO NOT dry mop heads. Contamination by wax or flammable solvents will create a
fire hazard.
WARNING: DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or
similarly textured rubberlike materials. Drying in a heated basket (tumbler) may damage
plastics or rubber and may be a fire hazard.
5. A program should be established for the inspection and cleaning of 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 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.
NOTE: Failure to do so will VOID THE WARRANTY.
7. UNDER NO CIRCUMSTANCES should the dryer door, lint drawer switches or heat safety devices
ever be disabled.
8. READ AND FOLLOW ALL CAUTION AND DIRECTION LABELS ATTACHED TO THE DRYER.
WARNING: Children should not be allowed to play on or in the dryers. Children should be supervised
if near dryers in operation.
3
SECTION II
ROUTINE MAINTENANCE
A. 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 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.
WARNING: LINT FROM MOST FABRICS IS HIGHLY COMBUSTIBLE. THE
ACCUMULATION OF LINT CAN CREATE A POTENTIAL FIRE HAZARD.
SUGGESTED INTERVAL
DAILY
Clean lint screen. Inspect lint screen and replace if damaged.
90 DAYS
Remove lint accumulation from lint chamber thermostats and sensors.
WARNING: TO AVOID THE HAZARD OF ELECTRICAL SHOCK, DISCONTINUE
ELECTRICAL SUPPLY TO THE DRYER.
Remove lint from the motor air vents and surrounding area.
IMPORTANT: Lint accumulation will restrict internal motor airflow, causing overheating and
irreparable 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
Inspect and remove lint accumulation in customer furnished exhaust ductwork system. Inspect exhaust back draft
dampers to insure they are not binding. Inspect and remove ALL lint accumulation from in and around the control
panel area, including the coin acceptors. Clean lint accumulation from around the basket (tumbler) wrapper area.
WARNING: LINT FROM MOST FABRICS IS HIGHLY COMBUSTIBLE. THE
ACCUMULATION OF LINT CAN CREATE A POTENTIAL FIRE HAZARD.
4
AS REQUIRED:
In cleaning and care of the cabinet, avoid using harsh abrasives. A product intended for the cleaning of appliances
is recommended.
B. ADJUSTMENTS
SUGGESTED INTERVAL
6 MONTHS
Drive belts should be examined. Cracked or seriously frayed belts should be replaced. Tighten loose drive
belts when necessary, and check belt alignment. Complete operational check of control and valves. Complete
operational check of ALL safety devices (door switches, sail switch and burner high limits and lint chamber
thermostats).
12 MONTHS
Inspect bolts, nuts, screws, and nonpermanent gas connections, (unions, sail switch, burner, and lint chamber
thermostats).
5
SECTION III
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: ANSI Z223.1LATEST EDITION (National Fuel Gas Code) or ANSI/NFPA NO. 70-LATEST EDITION (National Electrical
Code) or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1-M91
(Natural Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [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).
A. 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 the dryer (ADC PN 113328).
Bulkheads and partitions around the dryer should be made of noncombustible materials. (Refer to appropriate
installation manual for recommended distances and minimum allowances required.)
When the dryer is operating, it draws in room air, heats it, passes this air through the basket (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 could have premature motor failure from
overheating. The 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 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.)
CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUST DUCTWORK CAN
CREATE A POTENTIAL FIRE HAZARD.
6
B. ELECTRICAL AND GAS REQUIREMENTS
1. 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
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.
2. Grounding
A ground (earth) connection must be provided and installed in accordance with state and local codes. In
the absence of these codes, grounding must conform to applicable requirements of the National Electrical
Code ANSI/NFPA NO. 70-LATEST EDITION, or in Canada, the installation must conform to applicable
Canada Standards: Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION. The
ground connection may be to a proven earth ground at the location service panel.
IMPORTANT: Failure to comply with these codes or ordinances and/or the requirements stipulated in
this manual can result in personal injury or component failure.
3. Gas Information
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) or CAN/CGA-B149.2-M91 (Liquid
Propane [L.P.] Gas) or LATEST EDITION.
4. Gas Supply
The gas dryer installation must meet the American National Standard...National Fuel Gas Code ANSI
Z2231-LATEST EDITION, or in Canada, the Canadian Installation Codes CAN/CGA-B149.1 M91 (Natural
Gas) or CAN/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.
5. Piping Connections
ALL components/materials must conform to National Fuel Gas Code Specifications ANSI Z223.1-LATEST
EDITION, or in Canada, 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), as well as local codes and ordinances
and must be done by a qualified professional. It is important that gas pressure regulators meet applicable
pressure requirements, and that gas meters be rated for the total amount of ALL the appliance Btus being
supplied.
WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!!
NOTE: Undersized gas piping will result in ignition problems and slow drying and can create a safety
hazard.
7
The dryer must be connected to the type of gas (natural or liquid propane [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 ADC factory.
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) is made by changing the burner orifices. If this adjustment is necessary, contact the reseller who
sold the dryer or contact the ADC factory.
NOTE: Any burner changes must be made by a qualified technician.
C. OPERATIONAL SERVICE CHECK PROCEDURE
After performing any service or maintenance function, an operational check should be performed to insure that
ALL components are performing properly.
1. Make a complete operational check of ALL the operating controls to insure that the timing is correct;
temperature selection switches are functioning properly.
2. Make a complete operational check of ALL safety related circuits, door switches, hi-limit thermostats, sail
switch, and cycling thermostats, etc.
8
SECTION IV
DESCRIPTION OF PARTS
A. CONTROL PANEL
The coin panel assembly consists of the coin operator,
a display board, and the keyboard (touch pad) label.
The coin acceptor is used to acknowledge that the
proper coin has been put through the acceptor. The
display board will just display the time and temperature
in a readable number of letter characters. The
keyboard (touch pad) label is used to input Hi, Low,
or Perm Press selection for the dryer to start.
B. CONTROL AND RELAY PANELS
The control and relay panels are located in the back
of the dryer in the middle top selection. The function
of the control and relay panels is to compile signals
from the computer or the incoming voltage and transfer
the signals to the motor and heat circuit, when the
computer executes these various signals.
C. COIN BOX
The coin box assembly is located below the belt and
right coin panel. It is a good size triangular box. When
a coin passes the acceptor, the optic switch sends a
signal to the computer and the coin then falls in the
coin box.
9
D. DOOR SWITCH (HINGE BLOCK)
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.
E. MICROPROCESSOR ASSEMBLY
The microprocessor board is the latest Phase 5 controls.
It monitors the dryer functions ALL the time. Indicator
light emitting diode (L.E.D.) is mounted on the board to
help with servicing of the dryer.
F. BASKET (TUMBLER)
The basket (tumbler) consists of three (3) ribs and a perforated basket
(tumbler) along with a front and back, which are riveted together as an
assembly. The basket (tumbler) also consists of pop rivets, which attach
the basket (tumbler) to the drive system in the rear. The felt collar
helps to keep lint from accumulating behind the basket (tumbler).
G. BASKET (TUMBLER) AND DRIVE MOTOR ASSEMBLY ARRANGEMENT
The basket (tumbler) and the drive motor arrangement
are located (viewing from the front of the dryer)
approximately at the rear right side of the dryer. The
arrangement consists of an idler pulley, drive motor,
and basket (tumbler), which serve to adjust, drive,
and support the basket (tumbler). The idler assembly
has various nuts and bolts that are made to adjust the
belt tension.
10
H. IDLER ARM AND IMPELLOR MOUNT ASSEMBLY
The idler assembly is located in the back of the dryer, which is attached to the drive motor assembly. The main
purpose of the idler assembly is to reduce the speed of the motor, in turn increasing the torque of the basket
(tumbler) pulley.
I. DRIVE MOTOR AND IDLER PULLEY ARRANGEMENT
The dryer has a different kind of drive system. There is one (1) motor pulley, one (1) drive belt and an idler arm
assembly by the basket (tumbler). The drive motor drives the belt that rotates the basket (tumbler).
J. TEMPERATURE SENSORS
The temperature sensor used in a transducer converts heat into microamps, that the computer board then uses
to calculate the temperature.
11
K. GAS BURNER
The gas burner assembly consists of two (2) burner
tube orifices (the orifice has a hole in it to allow
gas to flow through). The hole size varies with
different elevation Btus, gas valve (which can be
up for natural or liquid propane [L.P.]), and a
flame-probe assembly.
L. 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 or any obstruction such as back draft
damper sticking or lint build up. The sail switch is located in the back of the burner.
M. HI-LIMIT THERMOSTAT
The burner hi-limit thermostat is another safety device
that we use on the dryer. The hi-limit is located in
the burner area. The hi-limit thermostat cuts off the
heat if the temperature should reach 290° or higher.
Under normal conditions, the only way this device
would shut off the heat is when the airflow changes
to the extent of causing the intense heat from the
burner to trip the thermostat.
12
N. LINT DRAWER SWITCH
The lint drawer switch is located under the basket
(tumbler) on the right side. It is another added safety
device that stops the operation of the dryer, when
the lint drawer is opened. This device and the door
switch are the two (2) safety switches designed to
halt the basket (tumbler).
O. LINT DRAWER
The lint drawer is located under the baskets
(tumblers) of each pocket. It is a fairly large drawer
that is designed to be right in the main path of the
airflow, to catch any lint that happens to come out of
the articles being dried.
P. FRONT THRUSTER WHEEL
BRACKET ASSEMBLY
Behind the front panel for each pocket, there are
two (2) basket (tumbler) drive wheels. This supports
the weight of the basket (tumbler). This also allows
the basket (tumbler) to spin freely without bearings
and basket (tumbler) support shaft.
13
Q. REAR BASKET (TUMBLER) DRIVE WHEELS
There is a left and right basket (tumbler) drive wheel bracket assembly. This allows the basket (tumbler) to spin
freely without bearings or basket (tumbler) support shaft.
R. ROTATIONAL SENSOR ASSEMBLY
The Rotational Sensor Assembly is located in the rear of the dryer. It consists of a magnet and a rotational
switch, which is mounted to the sail switch/rotational sensor bracket.
The magnetic rotational sensor switch senses the rotation of the basket (tumbler). If the gap between the sensor
switch and the magnet is greater than a preset amount, then the dryer will shutdown on “SEFL” (“rotational
sensor failure”).
14
SECTION V
SERVICE
A. INTRODUCTION
ALL electrical or mechanical service or repairs should be made with the electrical power to the dryer disconnected
(power off).
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 number and serial number available.
CAUTION: Observe ALL safety precautions displayed on the dryer or specified in this manual before
and while making repairs.
The information provided will help isolate 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 suspected component itself. Electrical parts
should always be checked for failure before being returned to the factory.
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 (Occupational Safety and Health Administration)
STANDARDS.
B. CONTROLS (COMPUTER)
TO REPLACE COMPUTER
1. Disconnect power to the dryer.
2. Open coin panel (one [1] lock in the center
of the coin panel).
3. Disconnect the display harness from the computer board (push the two [2] tabs on the side of the connector
outwards).
4. Disconnect the optic switch harness from the computer (squeeze the tabs on the side of the connector).
15
5. Disconnect the keyboard (touch pad) connector from the computer board keyboard (touch pad) harness
(simply pull straight out).
6. Disconnect the 9-pin main computer harness from the computer (squeeze the one [1] tab on the connector
and pull straight back).
7. Disconnect the green ground wire from the computer board.
8. Remove the two (2) Phillips head screws that secure the computer to the panel. Remove the board from
the panel by pulling at the corners of the board.
9. Replace in the reverse steps of the above.
10. Reestablish power to the dryer.
NOTE: Use caution when handling the microprocessor controller (computer) as it can be easily
damaged by static electricity.
TO REPLACE KEYBOARD (TOUCH PAD)
1. Discontinue power to the dryer.
2. Open the coin panel and disconnect the
keyboard (touch pad) ribbon connector from
the ribbon cable it is plugged into.
3. Peel the keyboard (touch pad) from the front
of the control panel taking care to avoid
scratching the panel.
4. Clean any adhesive residue from the panel.
5. Peel off paper backing from new keyboard (touch pad).
6. Align the display window on the keyboard (touch pad) with the cutout in the control panel and press in
place.
7. Connect keyboard (touch pad) ribbon to the board and reconnect power to the dryer.
8. Test for operation by pressing each temperature selection.
TO REPLACE COIN ACCEPTOR
1. Discontinue power to the dryer.
2. Open the coin panel.
3. Remove the four (4) 3mm nuts holding the coin acceptor to the panel.
4. Unplug optic switch harness connector.
5. Pull coin acceptor out gently.
6. Reverse procedure for installing new acceptor.
16
TO REMOVE OPTIC SWITCH
1. Disconnect power to the dryer.
2. Remove top or bottom coin panel.
3. Remove optic switch from the coin acceptor (one [1] screw).
4. Unplug optic switch connector.
5. Remove optic switch from the dryer.
6. Reverse procedure for installing new optic switch.
TO REPLACE MOTOR CONTACTOR 2-POLE, 24 VAC
1. Discontinue power to the dryer.
2. Remove back guard.
3. Remove ALL wires from contactor (NOTE: Make sure
each wire is marked with location removed from).
4. To remove the contactor, push up and pull the
contactor towards you.
5. Install new contactor in reverse procedure.
6. Reestablish power to the dryer.
TO REPLACE GAS VALVE
1. Discontinue power to the dryer.
2. Remove back guard.
3. Close the union shutoff located just before the gas valve
and remove the two (2) wires on top of the gas valve.
4. Break and loosen union nut between union shutoff and
gas valve.
5. Remove the four (4) screws holding the two (2) pipe
brackets on each side of the gas valve.
6. Remove gas valve and manifold (still attached) from dryer.
7. Remove the single port manifold from the output side of the gas valve.
8. Remove the union tailpiece and nut from the input of valve. (A 1/2” Allen wrench is required.)
9. Reverse procedure for installing new valve.
IMPORTANT: Pipe dope must be applied to manifold before installing it into new valve.
17
REPLACE BURNER TUBE ASSEMBLY (Refer to the illustration below)
1. Discontinue power to the dryer.
2. Remove the four (4) hex nuts that hold the burner hood bracket to the burner box.
3. Remove the two (2) hex nuts that hold the burner tube to the burner box.
4. Pull down on the burner tube to remove it.
5. Reassemble new burner tube (ADC PN: 141137) in reverse procedure.
IMPORTANT: Make sure the gap from the ignitor to the top of the burner tube is 1/8” +/- 1/32”
(3.175 mm +/- 0.79248 mm).
TO REPLACE THE IGNITOR PROBE
1. Discontinue power to the dryer.
2. To remove the ignitor probe, remove the two (2) screws that hold them to the burner box.
3. When replacing ignitor probe, remove screws, disconnect high voltage (HV) wire from DSI module and
remove the probe and high voltage (HV) wire from the ignitor.
4. Replace new items in reverse procedure.
IMPORTANT: DO NOT wrap the high voltage (HV) wire and flame-probe wires together, improper
operation may result. They may run along side each other.
IMPORTANT: Make sure the gap from the ignitor to the top of the burner tube is 1/8” +/- 1/32”
(3.175 mm +/- 0.79248 mm).
18
C. BURNER CONTROLS (GAS)
The illustration below shows you the gas valve assembly and the gas chamber.
TO REPLACE MAIN BURNER ORIFICE
1. Discontinue power to the dryer.
2. Remove back guard.
3. Remove screws securing gas valve bracket to the burner box, and remove the two (2) screws securing
pipe bracket.
4. Move the manifold assembly to the left and hold.
5. Unscrew main burner orifice and replace.
NOTE: Use extreme care when removing and replacing orifice. The orifice is made of brass and can
be easily damaged.
6. Reverse the removal procedure for reinstalling.
WARNING: Test ALL connections for leaks by brushing on a soapy water solution.
WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!!
19
TO TEST AND ADJUST GAS (WATER COLUMN [W.C.]) 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 always accurate. One (1) form of a manometer is a hydro-gauge, which simply consists
of an inner and outer tube. When this tube is filled with water and pressure is applied, the water in the inner tube
decreases giving you your gas pressure reading.
NOTE: Manometers are available from the factory by ordering part number 122804.
1. Test gas water column pressure.
a. 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 valves.
b. Start the dryer. With burner on, the correct water column reading in inches would be:
Natural Gas: ............................. 3.5 Inches (8.7 mb) W.C.
Liquid Propane (L.P.) Gas: ...... 10.5 Inches (26.1 mb) W.C.
2. To adjust water column pressure (natural gas only, L.P. gas must be regulated at source):
a. Remove the slotted vent cap on the top of the valve.
b. Turn the slotted adjustment screw, located on the top of the valve next to the terminals. Turn clockwise
(CW) to increase manifold pressure and counterclockwise (CCW) to decrease.
NOTE: If correct water column (W.C.) pressure cannot be achieved, problems may be due to an
undersized gas supply line, a faulty or underrated gas meter, etc.
20
TO CONVERT FROM NATURAL TO LIQUID PROPANE (L.P.) GAS
1. Disconnect electrical power to the dryer.
2. Close ALL shutoff valves in dryer gas supply line.
3. Disconnect gas valve wiring.
NOTE: Identify location of each wire for correct reinstallation.
4. Break union connection (nut) between union shutoff and gas valve.
5. Loosen and remove four (4) screws from pipe brackets holding the gas valve/manifold assembly to the gas
valve plate.
6. Remove gas valve and manifold assembly from the dryer.
7. Unscrew main burner orifice and replace with L.P. orifices supplied.
NOTE: Use extreme care when removing and replacing orifices. These orifices are made of brass,
which is easily damaged.
8. To convert gas valve for use with L.P. gas, refer to the instructions included in kit envelope (#f92-0737)
supplied.
9. Reverse procedure for installing valve manifold assembly to the dryer.
IMPORTANT: External regulation of a consistent gas pressure of 10.5 inches (26.1 mb) water
column (W.C.) must be provided.
10. Open ALL shutoff valves and test for leaks.
IMPORTANT: DO NOT test for leaks with an open flame. Use soapy water solution or a product
intended for that purpose.
11. Operate dryer through one (1) complete cycle to insure proper operation.
IMPORTANT: Conversion should be performed by competent technicians in accordance with local
and state codes. Improper assembly or adjustment can cause hazardous conditions.
NOTE: There is no regulator provided in a liquid propane (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.
12. Call American Dryer Corporation for L.P. conversion kits or the proper orifices for natural or L.P. gas.
21
TO REPLACE DIRECT SPARK IGNITION (DSI) MODULE
1. Discontinue power to the dryer.
2. Remove the back guard.
3. Remove the wires connected to the terminal strip
at the bottom of the module.
4. Remove the four (4) nuts securing the module to
the mounting bracket.
5. Replace module by reversing process.
NOTE: Take note of where wires are for installing the new module.
D. THERMOSTATS AND TEMPERATURE SENSOR
TO REPLACE HI-LIMIT THERMOSTAT (290°)
This thermostat is an important safety device, serving as an added protection against failure of the airflow sail
switch to open in the event of a motor failure or reduced airflow condition.
IMPORTANT: UNDER NO CIRCUMSTANCES should the heat circuit safety devices ever be
disabled.
1. Discontinue power to the dryer.
2. Remove the two (2) hex head screws from the hi-limit switch. Then, the hi-limit will be removed from the
burner box. Remove the two (2) wires from the hi-limit.
3. Reverse procedure for installing new thermostat.
22
TO REMOVE THE TEMPERATURE SENSOR OR HIGH HEAT PROTECTOR
1. High Heat Protector
a. Discontinue power to dryer.
b. Remove the lint drawer from the dryer.
c. Remove the two (2) free spin wash nuts that is securing the temperature sensor bracket to the dryer.
d. Disconnect the 4-pin connector on the temperature sensor bracket.
NOTE: Be careful not to let the sensor harness that you just disconnected to fall back into the
computer area.
e. Remove the two (2) nuts, washers, and screws
securing the 190° hi-limit to the sensor bracket. Also
disconnect the two (2) connectors on the 225° hi-limit.
f. Reverse the procedure for installation of new high
heat protector.
2. Temperature Sensor
a. Discontinue power to the dryer.
b. Remove the lint drawer from the dryer.
c. Remove the two (2) free spin wash nuts that are
securing the temperature sensor bracket to the dryer.
d. Disconnect the 4-pin connector on the temperature sensor bracket.
NOTE: Be careful not to let the sensor harness that you just disconnected to fall back into the
computer area.
e. Remove the top tinnerman clip that secures the sensor probe to the bracket. Also remove the connector
from the bracket. Disconnect the two (2) wires going to the 225° hi-limit. The sensor probe assembly
can now be removed from the bracket.
f. Install new probe assembly (ADC PN: 880251) by reversing procedure.
23
E. SAIL SWITCH ASSEMBLY
The sail switch is a heat circuit safety device, which controls the heat circuit only. When the dryer is operating
and there is proper airflow, the sail switch damper pulls in and closes the sail switch, providing ALL the other
heat related circuits are functioning properly. If an improper airflow occurs, the sail switch damper will release,
and the circuit will open.
IMPORTANT: UNDER NO CIRCUMSTANCES should heat circuit safety devices ever be disabled.
TO REPLACE SAIL SWITCH
1. Discontinue power to the dryer.
2. Remove the two (2) screws, which hold the sail switch to the bracket.
NOTE: Be careful not to drop or lose the twin speed nut on the backside of the sail switch.
3. Disconnect the two (2) connectors on the sail switch.
4. Reverse this procedure for installing new sail switch.
Adjust sail switch as described in the next section.
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 left side of the dryer. If the actuator arm is bent too far toward
the left side 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.
24
F. FRONT PANEL AND MAIN DOOR ASSEMBLIES
TO REPLACE MAIN DOOR SWITCH
1. Discontinue power to the dryer.
2. Open main door.
3. Remove the two (2) Phillips head screws holding the main door
switch in place.
4. Disassemble door switch bracket by removing the two (2) nuts
holding the door switch to the housing, and remove the door switch.
5. Reverse this procedure for installing new door switch.
IMPORTANT: UNDER NO CIRCUMSTANCES should the door switch be disabled.
TO REPLACE MAIN DOOR HINGE BLOCKS
1. Discontinue power to the dryer.
2. Remove the two (2) top 3/16” Allen screws securing the top hinge pin to the front panel.
3. Remove the door from the dryer by lifting the door off the bottom hinge pin.
4. Remove the bottom hinge pin assembly from the front panel, two (2) 3/16” Allen screws securing the hinge
pin to the front panel.
NOTE: Be careful not to lose the plastic washer on the hinge pin.
5. Reassemble by reversing steps.
TO INSTALL NEW MAIN DOOR GLASS
1. Remove main door assembly from the dryer (follow main door hinge removal procedure).
2. Place the 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 a narrow bead of silicone (ADC PN: 170730) ALL around main door area where glass will rest.
5. Install glass on to door and 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.
25
TO REPLACE FRONT PANEL
1. Discontinue power to the dryer.
2. Remove the computer panels.
3. Remove the kick trim plate.
4. Remove lint screen drawers from the dryer.
5. Remove the screws securing the front panel to the dryer.
6. Disconnect the 4-pin door switch harness connector from the lint drawer switch box, top and bottom.
7. Remove the front panel assembly from the dryer.
8. Reverse this procedure for installing the new front panel.
TO REPLACE THE NYLON CATCH
1. Open the main door.
2. Drill out the two (2) pop rivets holding nylon catch to front panel using #21 (0.1590) drill bit.
3. Using two (2) pop rivets (PN: 154215) install nylon catch (PN: 170330) to the front panel. (Friction Door
Latch Kit [PN: 881987]).
26
TO REPLACE ROTATIONAL SENSOR SWITCH
1. Discontinue electrical power to the dryer.
2. Remove the magnetic rotational sensor switch from the bracket by loosening the nuts.
3. Depress the tabs on the rotational sensor harness plug and pull apart, then remove the sensor switch.
4. To install a new sensor switch, connect the plug of the new sensor switch to the sensor harness.
5. Place one (1) adjustment nut onto the sensor switch.
6. Place the second adjustment nut on, but DO NOT tighten. The magnet on the rear teflon plate and the
sensor switch must be in a horizontal line to one another.
7. The gap between the magnet and the sensor switch must be 1/8 inch.
8. Tighten the adjustment nuts installed in Step #5 and Step #6.
9. Reestablish electrical power to the dryer.
27
BASKET (TUMBLER) REMOVAL
1. Disconnect power to the dryer.
2. Remove the control panels and kick trim plate.
3. Remove the front panel, and disconnect the door switches.
4. Now remove the motor separator panel if removing the top basket (tumbler).
5. Loosen the two (2) nuts on the idler tension arm.
6. Move to the rear of the dryer. Remove the retaining basket (tumbler) shoulder bolt that secures the rear
teflon pad to the basket (tumbler).
7. Now return to the front of the dryer and pull the basket (tumbler) outwards.
8. To install a new basket (tumbler), reverse the removal instructions.
BASKET (TUMBLER) WHEEL REMOVAL
1. Disconnect power to the dryer.
2. Follow Step #2 through Step #7 in Basket (tumbler) Removal above.
3. Loosen and remove the 9/16” nut and pull the wheel out.
4. Reverse Step #3 to reinstall the wheel.
5. To reassemble, reverse the previous procedures.
28
SECTION VI
BCD-1 TYPE MODULE
A. INTRODUCTION
The Direct Spark Ignition (DSI) system operates at 24 VAC and is a discrete component based gas ignition
control (DSI module) system, which utilizes a line frequency spark as an ignition source. Safe proof of flame is
accomplished through flame rectification. The DSI module has a diagnostic light emitting diode (L.E.D.) indicating
light, which simplifies troubleshooting in the event of a fault.
Other Features...
• Safe proof of ignition
• Multiple precise timing functions
• Draft tolerant burner supervision (recycles)
• Flame sensing via flame rectification
• AGA approved
• 24 VAC high cycle rated gas valves
• Suitable for operation with either natural gas or liquid propane (L.P.) gas
• Captive discharge spark
• Internal diagnostics
B. GENERAL SYSTEM INFORMATION
1. DSI System Components/Functions:
a. The DSI module is designed to be the “controller” of the DSI system.
When activated by the dryer’s controls, this module constantly monitors
and controls the functions of the DSI system (i.e., spark activation,
gas valve on/off functions, flame verification, etc.), can be operated at
either 50 Hz or 60 Hz; and has self-diagnostic capabilities.
The L.E.D. (indicator light) on the DSI module simplifies the
troubleshooting procedure in the event of a fault within the DSI system.
If the L.E.D. on the module lights “GREEN” continuously, then the
system is functioning properly. A flashing “GREEN” L.E.D.
(LOCKOUT mode) indicates that ignition/flame has not been confirmed.
Refer to the Troubleshooting Section of this manual for specific
diagnostic information.
Direct Spark Ignition DSI Module
The DSI module allows for a continuous spark burst of three (3) 8-second durations. If a flame is not
established after the initial three (3) 8-second spark burst, the module will LOCKOUT.
NOTE: To reset the DSI module if it is in the LOCKOUT mode, open and close the main door then
restart the dryer. If the module repeatedly locks out, refer to the Troubleshooting Section of
this manual.
29
The module also provides for safe proof of ignition. If a flame is not sensed by the flame-probe
electrode (of the ignitor/flame-probe assembly) within a specified time frame, the module will
de-energize the gas valve and the ignitor/flame-probe assembly, and go into the LOCKOUT mode.
If a flame is established (sensed) but then lost (flame out due to possible air turbulence), the Direct
Spark Ignition (DSI) module will wait 30-seconds then restart the ignition sequence.
IMPORTANT: The DSI module is a precision instrument, and should be handled carefully. Rough
handling or distorting components could cause the module to malfunction.
WARNING: THE DSI MODULE IS NOT FIELD REPAIRABLE.
NOTE: To reset the DSI module if it is in the LOCKOUT mode, open and close the main door then
restart the dryer. If the module repeatedly locks out, refer to the Troubleshooting Section of
this manual.
b. The 24 VAC transformer is designed to step down the
operating (primary) voltage of the dryer from 120 VAC,
208 VAC, or 240 VAC to the 24 VAC (secondary voltage),
which is necessary to operate the DSI system and in some
cases the controls of the dryer.
The transformer has multi-primary taps, which allow for
one (1) transformer to be used for any voltage application
including...120 volts, 208 volts, or 240 volts. Refer to the
Service Information Section of this manual for specific
transformer and wiring termination information.
c. The ignitor/flame sensor assembly is located in the burner
flame area and is used to ignite the gas by the use of a
high volt (HV) (14,000) synchronous spark, and to provide
feedback information to the DSI module as to whether
the burner flame is evident (on).
The ignitor/flame-probe assembly consists of a ceramic
insulated ignitor electrode, a ground rod and a ceramic
insulated flame-probe electrode. The gap between the
ignitor (spark) electrode and the ground rod is set, and
must be maintained at 1/8” +/- 1/32” (3.175 mm
+/- 0.79248 mm). When the DSI module provides the
high voltage synchronous spark (14,000 volts) through the
high voltage (HV) wire/lead, a spark is produced “over”
the gap. When this spark is produced, the gas valve is
opened. Upon ignition, the resistance in the flame-probe
electrode (of the ignitor/flame-probe assembly) changes
and the information is sent to the DSI module via the sensor
probe lead connection to the module. Once the resistance
is changed and sensed, the DSI module will sustain the
gas flow (provide 24 VAC power to the gas valve).
30
24 VAC Transformer
IMPORTANT: THE GAP SETTING ON THE IGNITOR/FLAME-PROBE ASSEMBLY IS
CRITICAL.
d. The Direct Spark Ignition (DSI) 24 VAC gas valve(s)
used are of the redundant type, which means the gas
valve is actually two (2) gas valves in one (1); one (1)
in series with the other. This is a safety feature, which
provides protection against gas flow in the event of a
failure of one (1) of the valves to seat properly. Other
features are that the gas valves have a manual shutoff,
a pressure tap outlet, and are designed for easy
conversion to regulated liquid propane (L.P.) gas.
IMPORTANT: The DSI gas valves are not field repairable. There are no parts available for field
repair. Replace valve only with exact model and/or type number as noted on gas
valve.
2. System (Basic) Electric Ratings/Specifications
a. Input Voltage: 18 VAC to 30 VAC (must be grounded)
b. Line Frequency: 50 Hz or 60 Hz
c. Maximum Input Current: 0.100 amps + valve load @ 25 VAC
d. Valve Load: 1-amp maximum @ 25 VAC
e. Spark Voltage: 14,000 volts
3. System (Basic) Timing Specifications
a. Trial for Ignition: 8-seconds
b. Flame Failure Response Time: 0.5-seconds maximum
c. Flame Failure Reignition Time: 0.5-seconds maximum
d. Prepurge Time: 1.5-seconds +/- 0.5-seconds
e. Retry Time: none
f. Lockout Time: 10-seconds maximum
31
C. G-760 DIRECT SPARK IGNITION (DSI) FLOWCHART
THERMOSTAT CALLS FOR HEAT
(24 Volts applied to control)
PREPURGE
* SECONDS
TRIAL TIME FOR IGNITION
* SECONDS
FLAME SENSED
AT MAIN BURNER?
NO
YES
POWER REMOVED
VALVES, SPARK
SWITCHED OFF
SPARK SWITCHED OFF
RUN-MAIN BURNER
OPERATION
(Control monitors
main burner flame)
3-TRIAL MODEL?
YES
NO
HAS THIRD TRIAL
BEEN COMPLETED?
NO
LOCKOUT
(Until power is removed
from control)
THERMOSTAT SATISFIED
(Power removed from control
and valves)
YES
* See control label for actual times.
INTERPURGE
* SECONDS
1. Normal Operation (Summary)
On a call for heat by the dryers’ controls, 24 VAC is applied to the DSI module at which time the modules’
light emitting diode (L.E.D.) indicator will light “GREEN” indicating that power has been established to the
module. Almost immediately (up to approximately 1.5-seconds [prepurge]), the valve opens and the spark
burst will be evident (on) for approximately 8-seconds. The burner flame should now be established/
confirmed.
If at this time the flame has not been established/confirmed, the DSI module will try two (2) more times,
then if still no ignition the modules’ indicator will blink continuously. To reset or cancel the “LOCKOUT”
condition, open and close the main door and restart the dryer.
Once the burner flame is established/confirmed, the DSI module L.E.D. indicator will stay “GREEN” and
the burner system will continue through a normal heating cycle, where the DSI system will cycle on and off
as required by the dryer’s controls.
During the normal heating cycle, should a flameout occur (i.e. severe air turbulence forces the flame away
from the ignitor assembly flame-probe), the DSI module will shut the gas valve off and try to reestablish the
burner flame after 30-seconds.
32
D. TROUBLESHOOTING
The troubleshooting information provided in this manual is intended for use only by qualified service technician.
Observe ALL safety precautions displayed on the equipment or specified in the installation/operator’s manual
included with the dryer.
IMPORTANT: UNDER NO CIRCUMSTANCES SHOULD ANY SAFETY OR HEAT
CIRCUIT DEVICE EVER BE DISABLED.
The following troubleshooting guide provides systematic procedures for isolating equipment problems, and again,
is intended for use by a qualified service technician.
TEST EQUIPMENT
The following pieces of test equipment will be required to troubleshoot this system with minimal time and effort:
MANOMETER
Used to measure gas pressure in inches of water column (W.C.)
Available from ADC - Part No. 122804
33
DSI IGNITOR GAP FEELER GAUGE (1/8”)
MULTIMETER/VOLTMETER
For checking the gap between ignitor assembly ground rod and spark electrode.
Available from ADC - Part No. 305410
For measuring voltage and/or amperage
1. Direct Spark Ignition (DSI) Troubleshooting Terms (Definitions)
a. LOCKOUT Mode - DSI module “GREEN” light emitting diode (L.E.D.) indicator light blinks
continuously. This indicates there is a system fault and most likely the fault is that the DSI module was
not able to ignite the gas.
b. FLAMEOUT - Burner flame shutdown by the DSI module due to lack of flame verification. This
condition occurs only after ignition has been evident, but, is lost. The system will attempt to relight the
burner after 30-seconds.
2. Troubleshooting/System Basic Diagnosis
a. Preliminary Steps - The following steps must be performed to minimize the time required to isolate
cause of fault.
1) DSI module L.E.D. indicator is off (no “GREEN” light).
a) Check for voltage (approximately 24 VAC) across the DSI module terminals “THS” and “GND”
(ground)...
If voltage (approximately 24 VAC) is evident, then, there is a malfunction within the DSI module
itself, and it must be replaced.
b) If there is no voltage, and the problem is not the DSI module or the ignition system, then the
problem is elsewhere in the dryer (i.e., dryers’ heat circuit [sail switch, hi-limit circuits, etc.]).
34
2) Direct Spark Ignition (DSI) module light emitting diode (L.E.D.) indicator lights “GREEN” for up to
approximately 1.5-seconds (prepurge). This indicates that ALL the controls (including ALL the
safety circuits) are functioning and power is being supplied to the DSI module.
a) DSI module L.E.D. indicator lights “GREEN.” This indicates a normal heating cycle. This also
indicates that the preliminary diagnostics of the module has confirmed that the DSI module is
functional.
b) DSI module L.E.D. indicator lights a blinking “GREEN” light continuously...LOCKOUT mode.
This indicates that the module tried to ignite the gas a total of three (3) times of an 8-second
spark each time. After the third time, this blinking “GREEN” L.E.D. comes on.
If the dryer repeatedly has DSI module “LOCKOUT” failures, the cause may be due to high
voltage (HV) getting into the DSI module probe circuit.
(1) Check to insure that the red voltage wire (between the ignitor spark electrode and the DSI
module) is not wrapped around the sensor probe wire (the wire between the DSI module
FP terminal and the ignitor assembly flame-probe). If the wires are touching one another,
separate and secure in place AWAY FROM ONE ANOTHER.
(2) Check to insure that the dryer is properly grounded and that the ground connections (GND)
to the DSI module are secure.
(3) If the problem persists, it is most likely to be in the external components (not the DSI module),
or wiring, or due to flame out...proceed as follows:
NOTE: Preliminary steps - DO NOT OMIT - to minimize the time required to troubleshoot this
system.
(a) Disconnect electric power to the dryer.
(b) Visually check DSI components for apparent damage.
(c) Check wiring for loose connection, nicks or cracking at the ceramic insulator, or shorting
of sensor to burner.
(d) Inspect the DSI ignitor/flame-probe assembly...
check electrode for visible cracking at ceramic insulator or shorting of sensor to burner
check to insure flame sensor rod is positioned over flame area
check for carbon deposits on flame sensor rod
check to insure that there is a 1/8” gap between the ground rod and the ignitor spark
electrode
b. After performing these inspections and making corrections, restore electric power to the dryer, start the
dryer and operate through one (1) complete cycle to insure ALL components are functioning properly.
If a no heat condition persists, the three (3) visual indicators, annotated as Item C on page 36, will help
isolate equipment problems and lead you directly to the proper Quick Reference Troubleshooting
Flowcharts on page 37, page 38, and page 39.
35
1) To effectively use this information or the flowcharts (on page 37, page 38, and page 39), each
step must be completed in sequence, performing whatever tests are suggested. After the completion
of each test, the guide will direct the service technician to the next logical step in the troubleshooting
sequence based on the outcome of the previous check.
2) Components should be replaced only after each step has been completed and replacement is
suggested in the flowchart. However, the experienced technician realizes that a loose connection
or broken or shorted wire may be at fault where electrical components are concerned, and not
necessarily the suspected component itself.
c. Three (3) Visual Checks...
1) No spark and system does not work. If not, proceed to First Visual Check on page 37.
2) Spark present but main burner does not come on. If not, proceed to Second Visual Check on
page 38.
3) Main burner lights but does not stay on. If not, proceed to Third Visual Check on page 39.
36
d. Troubleshooting Flowchart - Quick Reference...
First Visual Check
NO SPARK AND SYSTEM DOES NOT WORK
Is 24 VAC available
at transformer?
NO
Is 24 VAC present from terminal
THS2 to ground?
YES
NO
YES
Is power available
at primary?
NO
YES
Replace
transformer.
Are thermostats contacts and
limit control contacts closed?
Close
contacts.
Determine why
voltage is not
present.
NO
YES
Check continuity of wiring to
determine why voltage does
not exist at THS2.
Is jumper installed from
terminal 5 to ground?
Install
jumper
NO
YES
Open thermostat contacts for 30 seconds.
Close contacts and wait for prepurge (if applicable)
period. Is spark now present?
NO
Turn off supply voltage.
Check high voltage cable.
Is it securely attached to
spark transformer?
NO
YES
YES
Is condition of high voltage
cable good (not brittle, burnt,
or cracked)?
NO
Correct
YES
Replace
Replace
Johnson Control
module G760/761
Is spark electrode ceramic
cracked or is electrode
grounded out?
NO
YES
Replace electrode
assembly.
System was in lockout.
Observe a complete operating
cycle to determine why control
locked out.
37
e. Troubleshooting Flowchart - Quick Reference...
Second Visual Check
SPARK PRESENT BUT MAIN BURNER DOES NOT COME ON
Is main valve wiring securely
attached to terminal M.V.3
and ground?
NO
Is 24 VAC present
between terminals M.V.3
and ground?
YES
NO
YES
Correct
Replace
Johnson Control
module G760/761
Check for continuity in
wiring from M.V.3 to gas
valve, and gas valve to GR.
Determine
why continuity
does not exist.
NO
YES
Is inlet gas pressure per
manufacturer’s specifications?
NO
Correct
YES
Is Spark gap 0.1 in.
and in gas stream?
Correct
NO
YES
Replace
gas valve.
38
f. Troubleshooting Flowchart - Quick Reference...
Third Visual Check
MAIN BURNER LIGHTS BUT DOES NOT STAY ON
Is flame sensor cable
securely attached
to terminal 4?
NO
Does continuity exist
from control
to flame sensor?
YES
NO
Correct
Replace
sensor
cable.
YES
Is flame sensor corroded
or is ceramic cracked?
Correct or
replace
sensor.
NO
YES
Does continuity exist in
ground path from burner to
control?
Correct
NO
Is flame sensor positioned
per manufacturer’s
specifications?
NO
YES
Check flame sensing
current during trial.
Is current greater than
0.3µ A DC*?
NO
YES
YES
Correct
Replace
Johnson Control
module
G760/761
39
Replace
Johnson Control
module
G760/761
3. Troubleshooting/System Detailed Diagnosis
When the dryer calls for heat, 24 VAC from the step down transformer is applied to the “THS” and “GND”
(ground) terminals of the Direct Spark Ignition (DSI) module. The DSI module light emitting diode (L.E.D.)
indicator will light “GREEN.” The gas valve will be energized, and the spark burst will be evident (on) for
approximately 8-seconds at the tip of the electrode/flame-probe assembly. Flame should now be established/
confirmed. If a flame is not sensed/confirmed by the flame-probe sensor after the approximate 8-second
spark burst, the DSI module will wait 30-seconds and start ALL over again.
If a flame has been established/confirmed and then lost, the DSI module L.E.D. indicator will continue to
light “GREEN,” wait 30-seconds and try again. The flame should now be established/confirmed. If a
flame is not sensed/confirmed by the flame sensor probe after the initial try, the module will try two (2)
more times then if it is still not established it will go into LOCKOUT.
NOTE: To reset the DSI module if it is in the LOCKOUT mode, open and close the main door, then
restart the dryer.
a. System Diagnosis
1) Gas Pressure
A gas pressure test should be taken at the gas
valve pressure tap provided on every gas valve to
assure that the water column (W.C.) pressure is
correct and consistent.
There are two (2) types of devices commonly used
to measure water column pressure. They are the
spring/mechanical type gauge and the water
column test gauge (manometers). The use of the
spring/mechanical type of gauges is not
recommended because it/they are very easily
damaged and they are not always accurate. The
preferred type of gauge is the manometer because
it is a simple device to use and is highly accurate.
A manometer is simply a glass or transparent
plastic tube with a scale graduated in inches.
When it is filled with water and pressure is applied,
the water in the tube rises, showing the exact water
column pressure.
WARNING: Test ALL connections for leaks by brushing on a soapy water solution. NEVER TEST
FOR LEAKS WITH A FLAME!!!
40
a) Connect water column (W.C.) test gauge (manometer) to the gas valve pressure tap (1/8”
N.P.T.).
b) Start the dryer...with the burner on, the correct water column reading in inches should be:
Natural Gas .................................. 3.5 inches (8.7 mb) water column.
Liquid Propane (L.P.) Gas ............ 10.5 inches (27.4 mb) water column.
When a gas dryer is first started (during initial time of installation or start-up), it has a tendency
not to ignite on the first ignition attempt. This is due to the fact that the gas supply piping is filled
with air, so it may take a few minutes for the air to be purged from the supply lines. During this
purge period, there may be insufficient gas pressure for ignition, which might cause the Direct
Spark Ignition (DSI) module to go into the LOCKOUT mode (the light emitting diode [L.E.D.]
will BLINK “GREEN” CONTINUOUSLY).
NOTE: During the purge period, check to be sure that ALL gas shutoff valves are open.
NOTE: To reset the DSI module if it is in the LOCKOUT mode, open and close the main door then
restart the dryer.
2) Ignitor/Flame-Probe Assembly Adjustments
The ignitor/flame-probe assembly consists of a ceramic insulated ignitor electrode, a ground rod, and
a ceramic insulated flame-probe electrode. The gap between the ignitor electrode and the ground
rod is set, and must be maintained at 1/8” +/- 1/32” (3.175 mm +/- 0.79248 mm). When the DSI
module provides the high voltage (HV) synchronous spark (14,000 volts) through the high voltage
(HV) lead, a spark is produced over the gap. When this spark is produced, the gas valve is opened.
Upon ignition, the resistance in the flame-probe electrode (of the ignitor/flame-probe assembly)
changes. Once the resistance is changed, it initializes the DSI to sustain the gas flow (from the gas
valve).
IMPORTANT: The gap setting on the ignitor/flame-probe assembly is critical.
a) DSI Ignitor/Flame-Probe Assembly
Adjustments (TUBE BURNER TYPE)
(1) The gap on the ignitor/flame-probe assembly must
be set, and held at 1/8” +/- 1/32” (3.175 mm +/0.79248 mm). If this 1/8” gap is not maintained
(if the gap is either too large or too small), the
DSI module will indicate a system malfunction
and go into the LOCKOUT mode (L.E.D. will
BLINK “GREEN CONTINUOUSLY).
41
NOTE: To reset the Direct Spark Ignition (DSI) module if it is in the LOCKOUT mode, open and
close the main door, then restart the dryer.
(a) To check and/or set the 1/8” gap, use a DSI Ignitor gap feeler gauge (refer to the
illustration on page 41) or similar type device to determine the gap size. DO NOT
USE FEELER GAUGE TO SET GAP, use it only to determine the size of the gap.
If an adjustment is necessary, bend the ground rod to achieve the correct gap, then
recheck the 1/8” GAP with a feeler gauge.
(b) The alignment of the ignitor/flame-probe assembly in relation to the gap on the ignitor
electrode/ground rod must be maintained in as vertical (straight line) a position as
possible (refer to the illustration below) otherwise the DSI module will indicate
system malfunction and go into the LOCKOUT mode (L.E.D. will BLINK “GREEN”
CONTINUOUSLY).
NOTE: To reset the DSI module if it is in the LOCKOUT mode, open and close the main door, then
restart the dryer.
(c) The positioning of the ignitor/flame-probe assembly is extremely important because
it provides the necessary feedback information to the DSI module. The flame-probe
electrode must be positioned 1/4” minimum into the flame path (refer to the illustration
below) and must be positioned 1-inch (2.54 cm) maximum from the burner tube
(refer to the illustration below), otherwise, the DSI module will indicate a system
malfunction and go into the LOCKOUT mode (L.E.D. will LIGHT “RED”
CONTINUOUSLY).
NOTE: To reset the DSI module if it is in the LOCKOUT mode, open and close the main door, then
restart the dryer.
3) Air Turbulence
If there is sail switch flutter due to air turbulence or improper impellor rotation and/or a restriction in
the exhaust ductwork, the DSI module will cycle erratically. This in turn might cause the DSI
module to LOCKOUT (where the L.E.D. will BLINK “GREEN” CONTINUOUSLY).
a) If air turbulence causes the flame to move away from the flame-probe electrode (of the ignitor/
flame-probe assembly), or if the flame goes out completely during the heat (flame) cycle, the
DSI module will attempt to reestablish a flame by going into a reignition cycle.
42
NOTE: To reset the Direct Spark Ignition (DSI) module if it is in the LOCKOUT mode, open and
close the main door, then restart the dryer.
4) DSI Module
If there is some sort of operational interference in the DSI system, the DSI module (acting as the
“controller” for the system) will go into a LOCKOUT mode (where the light emitting diode [L.E.D.]
will BLINK “GREEN” CONTINUOUSLY).
a) Operational interference is any adverse condition (whether internal or external) to the system.
(Electrical noise is considered external noise interference because it can cause the DSI module
to cycle erratically.)
NOTE: To reset the DSI module if it is in the LOCKOUT mode, open and close the main door, then
restart the dryer.
If the gap, the alignment, and the position of the ignitor/flame-probe assembly are correct; if the
gas flow/pressure is constant and consistent; if there is no adverse air turbulence; and if the DSI
module remains in the LOCKOUT mode (where the L.E.D. will BLINK “GREEN”
CONTINUOUSLY) then, there is a malfunction within the DSI module itself, and it must be
replaced.
5) Wiring
If the DSI module is in the “LOCKOUT” mode (where the L.E.D. will BLINK “GREEN”
CONTINUOUSLY), and the mechanical components have been checked (i.e., the ignitor/flameprobe assembly, the gas valve, etc.), then there may be a problem somewhere in the DSI system
wiring.
a) Check ALL the wiring within the DSI system, especially the ground connections on the DSI
module and the ignitor/flame-probe assembly.
NOTE: Check for any possible damage to the ceramic insulators on the ignitor electrode and the
flame-probe electrode of the ignitor/flame-probe assembly.
b) Make sure the flame-probe electrode of the ignitor/flame-probe assembly is positioned no more
than 1-inch (2.54 cm) maximum from the burner tube.
CAUTION: DO NOT LET THE IGNITOR/FLAME-PROBE ASSEMBLY TOUCH THE
BURNER TUBES; OTHERWISE, THE ENTIRE ASSEMBLY WILL SHORT OUT.
6) DSI 24 VAC Transformer
The DSI transformer is designed to step down the operating voltage of the dryer to 24 VAC to
operate the DSI module. This transformer, like ALL transformers, is two (2) sided (refer to the
illustration on page 44).
43
a) Primary Side
This is the incoming voltage side -120 VAC, 208 VAC, 230/240 VAC - of the transformer.
b) Secondary Side
This is the step down side - 24 VAC - of the transformer.
WARNING: 208 VAC and 230/240 VAC ARE NOT THE SAME. ALL voltage connections
should be checked and confirmed according to the wiring diagram provided with the
individual dryer. Any damage done to dryer components due to improper voltage
connections will automatically VOID THE WARRANTY.
IMPORTANT: The ADC Service Department must be contacted prior to any wiring change and/or
conversion because, depending on the change/conversion required, some parts may
have to be added, deleted, or changed. When, contacting the ADC Service
Department, they must be given the correct model number and serial number for
the dryer(s).
NOTE: Any wiring change(s) and/or conversion(s) should be accomplished by a QUALIFIED
ELECTRICAL TECHNICIAN.
(1) Transformer Wiring
There are six (6) color-coded wires coming from the 24 VAC Transformer. There are
four (4) wires coming from the primary (incoming) voltage side of the transformer. Their
application and color-coding are as follows:
(a) For 120 VAC application ONLY;
1 - The BLACK and WHITE wires are used.
2 - The Red and Blue wires are capped off
individually.
(b) For 208 VAC application ONLY;
1 - The BLACK and BLUE wires are used.
2 - The Red and White wires are capped off
individually.
(c) For 240 VAC application ONLY;
1 - The BLACK and “RED” wires are used.
2 - The White and Blue wires are capped off individually.
There are two (2) yellow or orange wires coming from the secondary (step down)
side of the transformer.
(d) One (1) YELLOW or ORANGE wire is connected to the “GND” (ground)
termination.
44
(e) One (1) YELLOW or ORANGE wire supplies the 24 VAC signal for the control and/
or DSI circuit. (Refer to specific wiring diagram with the dryer for connection point.)
7) Direct Spark Ignition (DSI) 24 VAC Redundant Gas Valve
There are three (3) DSI 24 VAC Redundant Gas Valves in use (refer to the illustration below and
on the next page. The particular redundant gas valve that is used is dependent solely on the size
(model) of the dryer. ALL three (3) redundant gas valves utilize 24 VAC, which is provided by the
DSI module. Their applications are as follows:
IMPORTANT: The DSI 24 VAC Redundant Gas Valves (ADC Part No. 128927) contain no
serviceable parts, replacement coils ARE NOT available. Replace with exact model
and type number ONLY.
a) ADC PN 128927
(1) To check the resistance values on this particular gas valve.
(a) Disconnect the terminations at the gas valve from the DSI module.
WARNING: When taking ohm readings, the terminations from DSI module must be disconnected,
removed, otherwise, the readings obtained will be incorrect and/or erroneous.
(2) With a meter (either a multimeter or ohmmeter) set on the 200 ohm position, place the
meter leads across:
(a) Terminals 1 and 2 - the reading should be approximately 96 ohms.
(b) Terminals 3 and 4 - the reading should be approximately 96 ohms.
(3) If, after checking the resistance values on this particular redundant gas valve it is determined
that the ohm readings DO NOT approximate the ohm values listed above (96 ohms for
both readings), then, the gas valve must be replaced.
ADC PN 128927 5N7 REDUNDANT GAS VALVE
45
DIRECT SPARK IGNITION (DSI) SYSTEM COMPONENTS
24 VAC
DIRECT SPARK IGNITION (DSI)
TRANSFORMER
G760 DIRECT SPARK MODULE
ADC PN 128935
ADC PN 141403
46
SECTION VII
TROUBLESHOOTING
The information provided will help isolate the most probable components associated with the difficulty described.
The experienced technician realizes that a loose connection or broken or shorted wire may be at fault where
electrical components are concerned, however, not necessarily the suspected component itself.
Electrical parts should always be checked for failure before returned to the factory.
The information provided should not be construed as a device for use by an untrained person in making repairs.
Only properly licensed technicians should service the equipment.
Observe ALL safety precautions displaced on the equipment or specified in this manual while making repairs.
A. PHASE 5 COIN SYSTEM DIAGNOSIS
ALL major circuits, including door, microprocessor temperature sensor, heat and motor circuits are monitored.
The Phase 5 coin microprocessor controller (computer) will inform the user by the light emitting diode (L.E.D.)
display of certain failure codes along with indicators both in the L.E.D. display at the outputs of each relay and
door switch circuit to easily identify failures.
DIAGNOSTICS (L.E.D.) DISPLAY FAILURE CODES
1. “dOOr” - Indicates door switch circuit is open.
a. Keyboard (touch pad) entry was made while main door is open, or
b. There is a fault in the door switch circuit (external of the microprocessor controller [computer]).
c. Possible blown fuse.
2. “dSFL” - Indicates a fault in the microprocessor temperature sensor circuit. If a fault is detected in the
microprocessor heat sensor circuit, the display will read “dSFL” and the tone (buzzer) will
sound for approximately 5-seconds every 30-seconds until...
a. The problem is corrected, or
b. Power to the dryer is disconnected and the problem is then corrected.
47
IMPORTANT: The Phase 5 coin microprocessor controller (computer) has its own internal heat
sensing circuit fuse protection, located on the back side of the controller. If a “dSFL”
condition occurs, check to see if this fuse has blown. If it has, DO NOT replace the
entire microprocessor controller (computer); replace the fuse and do so with a
1/8-amp (Slo-Blo) fuse only.
NOTE: Once the microprocessor controller (computer) detects a problem in the heat circuit, it updates
every 30-seconds. If the problem was a loose connection in this circuit, which corrected itself,
the “dSFL” condition would be cancelled.
3. “SEFL” - indicates rotational sensor circuit failure meaning that there is a fault somewhere in the basket
(tumbler) rotation detection circuit, or the Phase 5 coin microprocessor controller (computer)
program related to this circuit (PL 0.l) is set incorrectly in the active mode (SEn) where the dryer
is not equipped with the optional rotational sensor and should be set in the nonactive mode
(nSEn). Also check to see if the belt came loose, or the rotational sensor magnet is broken. If
not, adjust rotational sensor reed switch within 1/4” to the magnet.
4. “Hot” -
indicates a possible overheating condition. The Phase 5 coin microprocessor controller (computer)
monitors the temperature in the dryer at ALL times. If the microprocessor controller (computer)
detects that the temperature in the dryer has exceeded 220° F (104° C), it will disable ALL outputs
(shut the dryer down), the tone (bUZ) will sound for approximately 5-seconds, and the light emitting
diode (L.E.D.) temperature sensor has dropped to 220° F (104° C) or lower and the microprocessor
controller (computer) is manually reset by closing and opening the program switch (PS) on the
back side of the controller.
MICROPROCESSOR CONTROLLER (COMPUTER) RELAY OUTPUT L.E.D. INDICATORS
There are three (3) L.E.D. indicators (red lights) located at the lower backside area of the controller, they are
identified and labeled “dOOr,” “MOTOR,” and “HEAT” (as shown in the illustration on the next page). These
L.E.D.s indicate that the outputs of the Phase 5 coin microprocessor controller (computer) or, in the case of the
door switch, the input is functioning.
1. “dOOr”
L.E.D. indicator should be on ALL the time (even if the dryer is not running) unless the main
door is open or there is a problem (open circuit) in the main door switch circuit.
2. “MOTOR” Output L.E.D. Indicator - if the dryer is started and the motor is not operating, yet both the
microprocessor controller (computer) display motor indicator dot and the “dOOr” input L.E.D.
indicator are on, but the motor output L.E.D. indicator is off, then the fault is in the Phase 5
coin microprocessor controller (computer) itself. If the motor is not operating and the MOTOR
output indicator is on, then the problem is elsewhere (i.e., external of the microprocessor
controller [computer]).
3. “HEAT”
Output L.E.D. Indicator - If the dryer is started and there is no “heat,” yet the microprocessor
controller (computer) display heat circuit indicator dot is on, but the output L.E.D. indicator is
off, then the fault is in the Phase 5 coin microprocessor controller (computer) itself. If both the
display heat indicator dot and the heat output L.E.D. indicator are on, then the problem is
elsewhere (i.e., external of the microprocessor controller [computer]).
48
NOTE: If the dryer is started (the light emitting diode [L.E.D.] display indicator dots are on) and there
are no outputs (heat and/or motor output L.E.D.s are off) and the “dOOr” input L.E.D. is on,
the fault is in the Phase 5 microprocessor controller (computer) itself. If the L.E.D. display
indicators are on and the door L.E.D. input and motor/heat output L.E.D.s are on the motor
and/or heat is not active (on), then the problem is not the door switch circuit or the Phase 5
coin microprocessor controller (computer); the problem is elsewhere in the dryer.
L.E.D. DISPLAY INDICATORS
The L.E.D. indicator dots located at the top portion of the L.E.D. display (refer to the illustration below)
indicate the Phase 5 coin microprocessor controller (computer) output functions while a cycle is in progress.
These dots DO NOT necessarily mean that the outputs are functioning. They are only indicating that the
function (output) should be active (on).
1. Heat Circuit Indicator - indicator dot is on whenever the Phase 5 coin microprocessor controller (computer)
is calling for the heating circuit to be active (ON).
2. Motor Circuit Indicator - indicator dot is on whenever a cycle is in progress.
49
B. NO HEAT CONDITION (BLOWER IS ON)
The following procedure must be performed with the microprocessor controller (computer) display in the normal
operating mode, the heat indicator dot on, and the light emitting diode (L.E.D.) output light is on. Voltage is 24
VAC unless otherwise specified.
50
1. With the heat indicator on check for voltage at J1 connector 9-pin connector pin #8 (orange wire to ground)
if 24 volt is present.
2. If no voltage (24 VAC) check for loose connection at 9-pin
connector or problem may be faulty microprocessor.
3. Check for voltage (24 VAC) at J11 connector pin #3 orange
wire. If no voltage, check for loose connection or bad basket
(tumbler) hi-limit. If voltage is present, proceed to next step.
4. At the rear basket (tumbler) hi-limit take a voltage reading (24
VAC) from one of the red wires to ground. Do this on both
wires one at a time. If voltage is not present, then the problem
is a loose connection going back to the sail switch or the sail
switch itself is faulty. If voltage is present on only one (1) of
the red wires, then the problem is a loose connection on the
rear basket (tumbler) hi-limit switch or the rear basket (tumbler)
hi-limit switch itself is faulty. If voltage (24 VAC) is present
from each red wire to ground then proceed to the next step.
5. Check for 24 VAC at the Direct Spark Ignition (DSI) module terminals marked “TH” and “GnD.” If no
voltage (24 VAC) is present check for a loose connection going back to the burner hi-limit or the burner
hi-limit itself may be faulty. If voltage (24 VAC) is present at the “TH” and “GnD” terminals proceed to
the next step.
6. If no spark is present, check for any hairline cracks at the base of the ignitor. If cracks are present replace
the ignitor. If no cracks are present, then the module (PN: 128935) may be faulty. If spark is occurring,
then proceed to Step #7.
7. Check for voltage (24 VAC) on the Direct Spark Ignition (DSI) module terminals marked “MV” and
“GnD” while the ignitor is sparking 24 VAC should be present on those two (2) terminals (“MV” and
“GnD”). If no voltage (24 VAC), then the problem is either a loose connection or a faulty DSI module (PN:
128935). If voltage is present proceed to next step.
8. Check for 24 VAC at the gas valve terminals
marked 1 and 2. If no voltage (24 VAC) is
present check for a loose connection on the two
(2) wires at the gas valve or the DSI module (PN:
128935) may be faulty. If voltage (24 VAC) is
present proceed to next step.
9. Check the gas valve shutoff and make sure it is
in the “on” position. Check to ensure proper gas
pressure is being applied to the gas valve. If still
no ignition, use a manometer on the manifold side
of the gas valve. If the proper gas pressure is
not present while the ignitor is sparking the problem
is a faulty gas valve.
51
C. NO START CONDITION
Follow this test procedure, providing that the microprocessor
controller (computer) is functioning where the display is in
the normal operating mode and the motor indicator dot is
on, and the light emitting diode (L.E.D.) motor output light
is on. The voltage you should be reading is 24 VAC unless
otherwise specified.
1. Check to see if “dOOr” L.E.D. input light is on.
(Located on component side of the computer board.)
If it’s off, refer to “dOOr” in the Troubleshooting
Section.
2. Check for voltage at the microprocessor pin #7. If no
voltage check for a loose connection or the
microprocessor itself is faulty. If no voltage is present,
proceed to the next step.
3. Check for voltage across the coil connections of the
motor relay. If no voltage is evident, check for a loose
connection going back to (J5) 6-pin connector #3. If
voltage is evident proceed to the next step.
4. Take a voltage reading on the motor contactor between L1 and N (neutral). If no voltage (120 VAC)
replace the motor contactor. If voltage is present, check for loose connection going to the drive motor or
the drive motor itself maybe faulty.
52
D. NO DISPLAY CONDITION
NOTE: Regardless of the voltage (120-240 VAC) make sure the voltage selector switch is set to
115 VAC.
1. Check power supply. (Dryer voltage 110v, 208v, 220v) (Circuit breaker box or fuse panel)
2. Check fuse 2 (3/4-amp Slo-Blo) if blown, replace it.
3. Check for voltage at the (J5) 6-pin connector (120 VAC) pin #1 black wire and pin #2 white wire. If no
voltage, check for a loose connection.
4. Check for voltage at the microprocessor pin #6 black wire and pin #3 white wire. If no voltage, check for
a loose connection. If voltage is present, the problem may be a faulty microprocessor.
5. Check for voltage across the computer’s 9-pin connector pin numbers 6 and 3 (110v, 208v, 220v). If no
voltage is evident, problem is bad wire or termination from the computer’s connector pin numbers 6 and 3
to the 9-pin connector (J2) pin numbers 6 and 3. If voltage is evident, problem is faulty computer.
53
E. “dSFL” DISPLAY CONDITION
When the display reads “dSFL” this condition indicates a fault in the microprocessor controller (computer) heat
circuit. This circuit includes the microprocessor controller (computer), microprocessor temperature sensor
(located in lint compartment) and wires to and from these two (2) points.
1. Check the 1/8-amp fuse on the computer board. If no continuity, replace with ADC PN: 136048. If fuse
repeatedly burns out go to Step #3.
2. Check for loose connection at the microprocessor sensor
bracket harness connector (located in lint compartment),
and the microprocessor 9-position connector at the
microprocessor controller (computer).
3. Discontinue power to dryer. Disconnect the
microprocessor 9-position connector from microprocessor
controller (computer) and locate connector holes 1 and
4. Disconnect sensor harness from sensor bracket
assembly (located in the lint compartment). Check for
continuity across each wire from harness connector in
lint compartment (J11) (pins 1 and 2) to appropriate
microprocessor 9-position connector (1 and 4). If no
continuity, problem is break in wire or bad termination
from that 4-pin (J11) connector through to the computer
9-position connector pins 1 and 4. Also, on the two (2)
wires, check for short to GND.
4. If above procedures check out okay, problem is a defective microprocessor temperature sensor.
54
F. “dOOr” DISPLAY CONDITION
When the display reads “dOOr,” this indicates that there is a fault (open circuit) somewhere in the microprocessor
controller’s (computer’s) door switch circuit. Include the door switch, microprocessor controller (computer)
and the wires to end from these two (2) points. Before following this test procedure, check the component side
of the computer to see if light emitting diode (L.E.D.) input light is on. If on and still reads door, replace
computer. Voltage is 24 VAC unless otherwise specified.
1. Remove door switch assembly from dryer. Check for
continuity across the two (2) terminals of the door switch
with plunger pushed in. If no continuity, replace the door
switch. If continuity is evident, reassemble door switch back
on dryer.
a) Repeat the above procedure; for the lint door switch.
2. Make sure both the main and lint doors are closed and the
plungers are pushed in. Check for voltage, across pin #4
(blue wire) (J5) 6-pin connector to ground. If no voltage is
evident, problem could be faulty transformer or fuse 1 is
blown. If voltage is evident, then continue with Step #3.
3. Check for voltage at the (J2) 3-pin connector pin #1 blue
wire to ground. If no voltage, the problem is a loose
connection or a bad main door switch. If no voltage is evident
continue to Step #4.
4. Take a voltage reading at the microprocessor (J1) 9-pin
connector, pin #9 blue wire. If no voltage is evident, the
problem may be a loose connection on that wire or a bad lint
drawer switch.
55
SECTION VIII
DATA LABEL INFORMATION
A. DATA LABEL
Contact American Dryer Corporation
When contacting American Dryer Corporation, certain information is required to ensure proper service or
parts information from ADC. This information is on the data label, which is affixed to the left side panel/wall
area behind the bottom control panel. When contacting ADC, please have the model number and serial
number handy.
1. MODEL NUMBER
The model number is an ADC number, which describes the size of the dryer and the type of heat (gas,
electric, or steam).
2. SERIAL NUMBER
The serial number allows ADC to gather information on your particular dryer.
3. MANUFACTURING CODE NUMBER
The manufacturing code number is a number issued by ADC, which describes ALL possible options on your
particular model.
56
4. TYPE OF HEAT
This describes the type of heat for your particular dryer: gas (either natural gas or liquid propane [L.P.] gas),
electric, or steam.
5. HEAT INPUT (for GAS DRYERS)
This describes the heat input in British Thermal Units per Hour (Btu/hr).
6. ORIFICE SIZE (for GAS DRYERS)
Gives the number drill size used.
7. ELECTRIC SERVICE
This describes the electric service for your particular model.
8. GAS MANIFOLD PRESSURE (for GAS DRYERS)
This describes the manifold pressure taken at the gas valve tap.
9. APPLICABLE APPROVAL SEAL(S)
I.E., Canadian Standards Association International.
B. USING A MANOMETER
HOW TO USE A MANOMETER (ADC PN: 122804)
1. With dryer in nonoperating mode remove plug on the gas valve pressure tap.
2. Attach plastic tubing to pressure tap. (Fitting is supplied with manometer, refer to the illustration.)
3. Attach manometer to dryer using magnet.
NOTE: Place manometer in a position so that readings can be taken at eye level.
4. Fill manometer as shown in illustration to the zero level.
5. Start dryer. With burner on, take a reading.
a) Read water level at the inner tube. Readings should be taken
at eye level.
b) Correct readings should be:
Natural Gas: ...... 3.5 Inches (8.7 mb) W.C.
L.P. Gas: ............ 10.5 Inches (26.1 mb) W.C.
6. If water column pressure is incorrect refer to “TO ADJUST GAS
PRESSURE” on page 20.
7. Reverse procedure for removing manometer.
57
C. LIGHT EMITTING DIODE (L.E.D.) DISPLAY CODES
A
ACOn
Adrt
AFAt
AGt
AtIn
AtSt
AUtO
b
bCLO
bCrS
bUZ
CEL
CLCC
COIn
CrCC
donE
dOOr
dSFL
FAr
FILL
FLS
FrEE
GdLY
Gont
Grd
HICd
Hot
LCC
LCde
LOCd
nbUZ
nFLS
Ngrd
nSEn
PdrY
PL
PLOC
PP
PUSH
rCC
rCdE
SEFL
SEn
tFAS
tInE
Automatic Cycle (Slope Program Factor)
Accumulative Coin
Maximum Auto Dryness Time
Amount For Additional Time
Active Anti-Wrinkle Guard Time
Accumulative Time
Amount Start
Automatic Mode (Patent No. 4,827,627)
Automatic Cycle (Heat loss [offset] Factor)
Bad Coin Lockout
Bad Coin Reset
Buzzer (Tone)
Degree in Celsius
Clear Left Coin Count
Coin Mode
Clear Right Coin Count
Drying and Cooling Cycles Complete
or
Dryer is in Anti-Wrinkle Cycle
Door Circuit is Open
Dryer Sensor Circuit Failure
Degree in Fahrenheit
No Cycle in Progress
Flash Display Active
Free Dry Mode
Anti-Wrinkle Delay Time
Anti-Wrinkle On Time
Anti-Wrinkle Program Active
High Cool Down Temp
Overheating Condition
Left Coin Count
Left Coin Denomination
Low Cool Down Temp
No Buzzer (Tone)
No Flash Display
No Anti-Wrinkle
Rotational Sensor Not Selected
Percent Dry
Program Location
Program Location Automatic Review
Permanent Press
Amount to Start has been Inserted
Make Temperature Selection
Right Coin Count
Right Coin Denomination
Rotational Sensor Circuit Failure
Rotational Sensor Selected
Time for Amount to Start
Timed Mode
58
The revision number is located on the top right hand corner of the diagram. It is a six (6) digit number followed
by a letter to distinguish the version dates (refer to the illustration).
Your particular model will be different depending on the date of manufacturing and options available.
The correct wiring diagram for your dryer is folded and placed inside of the computer area.
Diagrams for this book are as follows: (including ALL revisions of the numbers listed below)
59
60
ADC 450213
1 - 08/18/03-25