American Dryer AD-170 Parts Diagram
AD-115/120/170
ML-120/130/145/170
Service Manual
Phase 7 Microprocessor Controls
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
ADC Part No. 451102-2
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/operator's manual
included with the dryer.
The following “FOR YOUR SAFETY” caution must be posted near the dryer in a prominent location.
FOR YOUR SAFETY
Do not store or use gasoline or
other flammable vapors and liquids
in the vicinity of this or any other
appliance.
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.
POUR VOTRE SÉCURITÉ
Ne pas entreposer ni utiliser d’essence
ni d’autres vapeurs ou liquides
inflammables dans le voisinage de cet
appareil ou de yout autre appareil.
Important
For your convenience, log the following information:
DATE OF PURCHASE MODEL NO.
DISTRIBUTORS NAME
Serial Number(s)
Replacement parts can be obtained from your distributor 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 orders 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 from
the various dryer models. Be sure to check 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 OR THE STEAM SUPPLY BEFORE ANY
COVERS OR GUARDS ARE REMOVED FROM THE MACHINE TO
ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLATION, OR
TESTING OF ANY EQUIPMENT PER OSHA (Occupational Safety and Health
Administration) STANDARDS.
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, outer tops,
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 in the front electrical control box area.
WARNING
DO NOT place articles on or against this appliance.
Table Of Contents
SECTION I
IMPORTANT INFORMATION................................................................................3
A. Safety Precautions ...................................................................................................................... 3
SECTION II
ROUTINE MAINTENANCE .....................................................................................4
A. Cleaning ..................................................................................................................................... 4
B. Adjustments ............................................................................................................................... 5
C. Lubrication ................................................................................................................................. 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 ........................................................................................ 7
SECTION IV
DESCRIPTION OF PARTS ......................................................................................9
A. Control Panel (Microprocessor).................................................................................................. 9
B. Control Box (Computer Controls)............................................................................................... 9
C. Main Door Switch ...................................................................................................................... 9
D. Lint Drawer Switch................................................................................................................... 10
E. Lint Drawer .............................................................................................................................. 10
F. Basket (Tumbler) ...................................................................................................................... 10
G Basket (Tumbler) Bearing and Pulley Arrangement..................................................................... 11
H. Idler Bearing............................................................................................................................. 11
I. Drive Motor and Blower Motor ................................................................................................ 11
J. Temperature Sensor (Computer Controls) ................................................................................. 12
K. Gas Burner ............................................................................................................................... 12
L. Steam Damper System ............................................................................................................. 12
M. Compressed Air Requirements .................................................................................................. 13
N. Electric Oven............................................................................................................................ 13
O. Sail Switch (Electric and Gas Models)....................................................................................... 13
P. Motor Contactor (1ø Motor) .................................................................................................... 14
Q. Non-Reversing Contactor (3ø Motor)....................................................................................... 14
R. Reversing Relay Panel............................................................................................................... 14
S. Hi-Limit Thermostat (Gas and Electric Models Only)................................................................. 15
SECTION V
SERVICING ...............................................................................................................16
A. Controls (Computer) ................................................................................................................ 16
B. Burner Controls (Gas) .............................................................................................................. 19
C. Steam Controls......................................................................................................................... 24
D. Electrical Oven Controls ........................................................................................................... 27
E. Thermostats and Temperature Sensor........................................................................................ 28
F. Sail Switch Assembly (Gas and Electric Models) ....................................................................... 29
G. Front Panel and Main Door Assemblies..................................................................................... 30
H Basket (Tumbler) and Bearing Assembly ................................................................................... 33
I. Idler and Bearing Assembly....................................................................................................... 35
J. Drive Pulley .............................................................................................................................. 36
K. Basket (Tumbler) ...................................................................................................................... 36
L. V-Belts..................................................................................................................................... 39
M. Motor ...................................................................................................................................... 40
N. Impellor (Fan) .......................................................................................................................... 40
O. Lint Drawer Screen .................................................................................................................. 41
SECTION VI
TROUBLESHOOTING ............................................................................................42
SECTION VII
DATA LABEL INFORMATION..............................................................................56
A. Data Label ............................................................................................................................... 56
B. Using A Manometer .................................................................................................................. 58
C. Keyboard (touch pad) Layout................................................................................................... 59
D. Sensor Activated Fire Extinguishing (S.A.F.E.) System Theory of Operation .............................. 60
E. Static Pressure.......................................................................................................................... 61
F. Using A Magnehelic .................................................................................................................. 62
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 appliance.
2. Purchaser and user should consult the local gas supplier for proper instructions to be followed in the event
the user smells gas. The instructions should be posted in a prominent location.
3. Dryers must be exhausted to the outdoors.
4. Although ADC produces a very versatile dryer, there are some articles that, due to fabric composition or
cleaning method, should not be dried in it.
WARNING: Dry only water washed fabrics. DO NOT dry articles spotted or washed in dry
cleaning solvents, a combustible detergent or “all purpose” cleaners. EXPLOSION COULD
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RESULT.
WARNING: DO NOT dry rags or articles coated or contaminated with gasoline, kerosene, oil,
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paint, or wax. EXPLOSION COULD RESULT.
WARNING: DO NOT dry mop heads. Contamination by wax or flammable solvents will create a
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fire hazard.
WARNING: DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or
similarly textured rubber materials. Drying in a heated basket (tumbler) may damage plastics or
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rubber and may be a fire hazard.
5. A program should be established for the inspection and cleaning of the lint in the burner area and exhaust
ductwork. The frequency of inspection and cleaning can best be determined from experience at each
location.
WARNING: THE COLLECTION OF LINT IN THE BURNER/OVEN AREA AND
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EXHAUST DUCTWORK CAN CREATE A POTENTIAL FIRE HAZARD.
6. For personal safety, the dryer must be electrically grounded in accordance with local codes and/or the
National Electrical Code ANSI/NFPA NO. 70-LATEST EDITION or in Canada, the Canadian Electrical
Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION.
7. UNDER NO CIRCUMSTANCES should the dryer door switch or heat circuit safety devices ever be
disabled.
WARNING: PERSONAL INJURY OR FIRE COULD RESULT.
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8. READ AND FOLLOW ALL CAUTION AND DIRECTION LABELS ATTACHED TO THE
DRYER.
WARNING: Children should not be allowed to play on or near the dryer(s). Children should be
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supervised if near dryer(s) 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
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ACCUMULATION OF LINT CAN CREATE A POTENTIAL FIRE HAZARD.
IMPORTANT: Dryer produces combustible lint and must be exhausted to the outdoors. Every 6
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months, inspect the exhaust ducting and remove any lint build up.
SUGGESTED CLEANING SCHEDULE
DAILY
Clean lint from the lint screen. Inspect and replace if torn.
90 DAYS
Remove lint accumulation from lint chamber thermostats and sensors. Remove lint from the motor air vents and
surrounding area.
WARNING: TO AVOID THE HAZARD OF ELECTRICAL SHOCK, DISCONTINUE
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ELECTRICAL SUPPLY TO THE DRYER.
IMPORTANT: Lint accumulation will restrict internal motor airflow, causing overheating and
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irreparable motor damage. Motor failure due to lint accumulation will VOID THE WARRANTY.
120 DAYS
On gas and electric models, remove lint from gas burner area with a dusting brush or vacuum cleaner attachment.
On steam dryers, clean coil. Proper cleaning of the steam coil is necessary to prevent lint build up between the
fins. When cleaning the coil, be extremely careful not to bend the aluminum fins, which will also reduce airflow.
If the fins are bent, straighten them by using a comb. Fin combs are available from local air conditioning supply
houses. Regular cleaning will prevent lint build up and blockage of the coil.
4
6 MONTHS
Inspect and remove lint accumulation in the customer furnished exhaust ductwork system. Inspect exhaust
draft dampers to insure they are not binding. Inspect and remove ALL lint accumulation from in and around
control box area including coin acceptors. Clean lint accumulation from around basket (tumbler) wrapper area.
IMPORTANT: THE ACCUMULATION OF LINT IN THE EXHAUST DUCTWORK
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CAN CREATE A POTENTIAL FIRE HAZARD.
AS REQUIRED
In the cleaning and care of the cabinet, avoid using harsh abrasives. A product intended for the cleaning of
appliances is recommended.
B. ADJUSTMENTS
7 DAYS AFTER INSTALLATION AND EVERY 6 MONTHS THEREAFTER
Inspect bolts, nuts, screws (bearing setscrews), nonpermanent gas connections, and grounding connections
(unions, shutoff valves, and orifices). Motor and drive belts should be examined. Cracked or seriously frayed
belts should be replaced. Tighten loose V-belts when necessary, and check belt alignment. Complete operational
check of controls and valves. Complete operational check of ALL safety devices (door switches, sail switch,
burner and lint chamber thermostats).
NOTE: V-belts should be replaced in matched pairs.
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C. LUBRICATION
The motor bearings, idler bearings and basket (tumbler) bearings are permanently lubricated, and no lubrication
is necessary.
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
Z223.1-LATEST 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/CGAB149.1-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 a detailed description refer to the
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installation booklet for OPL dryers.
Bulkheads and partitions around the dryer should be made of noncombustible materials. Allowances should
be made for the opening and closing of the control door and lint door. Also, allowances should be made in the
rear for ease of maintenance. (Refer to installation manual for recommended distances and minimum allowances
required.)
When the dryer is operating, it draws in room air, heats it, passes the air through the basket (tumbler), and
exhausts it out the building. Therefore, the room air must be continually replenished from the outdoors. If the
make-up air is inadequate, drying time and drying efficiency will be adversely affected. Ignition problems and
sail switch “fluttering” problems on gas dryers may result, and you also could have premature motor failure from
overheating. On electric dryers, premature electric element failure may result. Air supply must be given
careful consideration to insure 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
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the motors and other dryer components.
Exhaust ductwork should be designed and installed by a qualified professional. Improperly sized ductwork will
create excessive back pressure, which will result in slow drying, increased use of energy, and shutdown of the
burner by the airflow (sail) switch.
CAUTION: IMPROPERLY SIZED OR INSTALLED OR MAINTAINED (CLEANED)
EXHAUST DUCTWORK CAN CREATE A POTENTIAL FIRE HAZARD.
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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.
IMPORTANT: Failure to comply with these codes or ordinances, and the requirements stipulated
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in this manual, can result in personal injury or component failure.
It is your responsibility to have ALL plumbing connections made by a qualified professional to assure that the gas
plumbing installation is adequate and conforms to local and state regulations or codes. In the absence of such
codes, ALL plumbing connections, materials, and workmanship must conform to the applicable
requirements of the National Fuel Gas Code ANSI Z223.1-LATEST EDITION, or in Canada, the Canadian
Installation Codes CAN/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [L.P.]
Gas) or LATEST EDITION.
1. Gas Supply
The gas dryer installation must meet the American National Standard...National Fuel Gas Code ANSI
Z223.1-LATEST EDITION, or in Canada, the Canadian Installation Codes CAN/CGA-B149.1 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.
In Australia, the fuel gas code is AS 5601/AG 601, local authority, gas, electricity, and any other relevant
statutory regulations.
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 Btu being supplied.
NOTE: Undersized gas piping will result in ignition problems and slow drying and can create a
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safety hazard.
The dryer must be connected to the type of gas (natural or L.P.) indicated on the dryer data label. If this
information does not agree with the type of gas available, DO NOT operate the dryer. Contact the dealer who
sold the dryer or contact ADC.
The gas input ratings shown on the dryer data label are for elevations up to 2,000 feet (609.6 meters), unless
elevation requirements of over 2,000 feet (609.6 meters) were specified at the time the dryer order was placed
with the factory. The adjustment for dryers in the field for elevations over 2,000 feet (609.6 meters) are made
by changing the burner orifices. If this adjustment is necessary, contact the dealer who sold you the dryer or
contact ADC.
NOTE: Any burner changes must be made by a qualified technician.
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7
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 assure that the timing is correct,
temperature selection switches are functioning, etc.
2. Make a complete operational check of ALL safety related circuits, door switch(s), hi-limit thermostat, sail
switch, cycling thermostats, etc.
3. On gas models, gas pressure test should be taken at the gas valve pressure tap of each dryer to assure that
the water column (W.C.) pressure is correct and consistent.
NOTE: Water column pressure requirements (measured at the gas valve pressure tap):
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4. The dryer should be operated through one (1) complete cycle to assure that no future adjustments are
5. For 3-phase (3ø) motor models, check the electric service phase sequence while the dryer is operating.
Natural Gas...............................3.5 inches (8.7 mb) Water Column.
Liquid Propane (L.P.) Gas .........10.5 inches (26.1 mb) Water Column.
necessary and that ALL components are functioning properly.
Check to see if the blower wheel is rotating in the proper direction. Looking from the front, the blower
wheel should spin in the clockwise (CW) direction. If so, the phasing is correct. If the phasing is incorrect,
reverse two (2) leads at connections L1, L2, L3 of power supply to the dryer.
8
SECTION IV
DESCRIPTION OF P AR TS
A. CONTROL PANEL (MICROPROCESSOR)
Lifting the control door will reveal the control panel
assembly. Opening the control panel will allow access to
the major components, which include the computer board,
and keyboard (touch pad). The keyboard (touch pad)
inputs to the computer what temperature and program
has been selected. The computer controls the entire
operation of the dryer. It accepts inputs and gives outputs
to various parts throughout the dryer.
B. CONTROL BOX (COMPUTER CONTROLS)
The computer control box is made up of several computer harnesses. These harnesses provide input and
output voltages to various devices throughout the dryer.
C. MAIN DOOR SWITCH
The main door switch is located behind the main door
on the right hand side. When the main door is opened,
the switch will also open, preventing the dryer from
operating. The main door switch is a safety device and
should never be disabled.
9
D. LINT DRAWER SWITCH
The lint drawer switch is located in the lint compartment
and attached to the side of the lint drawer track. The lint
drawer switch insures that the dryer will operate only when
the lint drawer is completely close. This is a safety device
and should never be disabled.
E. LINT DRAWER
The lint drawer is a pullout type and is located at the bottom
of the dryer in the lint compartment. Simply grab the lint
drawer handle, slide out the drawer, brush off the lint, and
slide the drawer back in. The lint screen must be kept
clean in order for the dryer to operate properly and
efficiently.
F. BASKET (TUMBLER)
The basket (tumbler) consists of three (3) or four (4) ribs
and a perforated basket (tumbler) along with a front and
back, which are riveted or screwed together as an
assembly. The basket (tumbler) also consists of tie rods,
which support the basket (tumbler) from front to back.
The basket (tumbler) support is used to mate the basket
(tumbler) to the drive system in the rear. Some models
also have a felt band, which helps to keep lint from
accumulating behind the basket (tumbler).
10
G. BASKET (TUMBLER) BEARING AND PULLEY ARRANGEMENT
The basket (tumbler) bearing and the pulley arrangement
is located (viewing from the rear of the dryer)
approximately at the upper center of the dryer. The
arrangement consists of a pulley, bearing platform, and
bearing, which serve to adjust, drive, and support the
basket (tumbler).
H. IDLER BEARING
Viewing from the rear of the dryer, the idler assembly
is located approximately on the lower left hand side of
the dryer. The idler assembly consists of one (1)
compound pulley. The idlers main purpose is to reduce
the speed and increase the torque, provided to the basket
(tumbler) bearing. Also, the idler assembly belt tension
can be adjusted. AD-15 thru AD-30 requires a 9” x
2-1/2” pulley. AD-50 thru AD-75 requires a 14” x 3”
pulley.
I. DRIVE MOTOR AND BLOWER MOTOR
The drive motor is located on the back, approximately lower center of the dryer. It sits on an adjustable base, so
that the motor can be easily adjusted to the left or right, up or down. On non-reversing dryers, the blower end of
the motor is connected to the impellor, a backward curved paddlewheel. The impellor provides airflow in the
dryer. It creates a vacuum, which pulls the hot air from the burner into the basket (tumbler) through the lint
screen and out the exhaust. On reversing dryers, there are two (2) motors, one (1) for the drive and one (1) for
the blower.
Reversing Models Non-Reversing Models
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J. TEMPERATURE SENSOR (COMPUTER CONTROLS)
The temperature sensor used, is a transducer
that converts heat into microamps that the
computer board then uses to calculate the
temperature.
K. GAS BURNER
Gas dryers are equipped with a gas burner located behind the control door. The gas burner assembly consists of
the burner tubes, orifices (the orifices have a hole in them to allow gas to flow through. The hole size varies with
different elevations, and different BTUs), gas valve (which can be set up for natural gas or liquid propane [L.P.]
gas), spark ignitor/flame-probe assembly, sail switch, and hi-limit thermostat. Gas burners will vary from model
to model in size, shape, and relative location. Some models are equipped with heat reclaimer systems in which,
some of the exhaust air is recovered and introduced back into the drying process.
L. STEAM DAMPER SYSTEM
The newest type system is called the steam damper. It is
shown to the right and it uses a piston with compressed
air to open and close the steam damper, which in turn
allows the air to flow either through the coil for heat, or
under the coil for cool down. Air supply is 80 PSI +/- 10
PSI (5.51 bar +/- 0.69 bar).
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M. COMPRESSED AIR REQUIREMENTS
This dryer requires an external supply of air (2.5 cfm @
80 PSI [0.07 cmm @ 5.51 bar]) on the steam models, the
air is necessary to operate the steam damper system. On
both steam, as well as the gas model, the air is necessary
for the blower air jet operation to clean lint from the
impellor/fan (squirrel cage type).
N. ELECTRIC OVEN
Electric dryers are equipped with an electric oven
located behind the control door. The electric oven
assembly consists of the electric oven box, contactor,
and heating elements. In an electric oven, the elements
heat the passing airflow entering the basket (tumbler).
ALL ovens have Kw ratings. This is the rating of how
much heat the oven can produce. The higher the rating,
the more heat.
O. SAIL SWITCH (ELECTRIC AND GAS MODELS)
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. Sail switch is located in front of the oven
on electric dryers and in the back of the burner on
gas models.
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P. MOTOR CONTACTOR (1Ø MOTOR)
This motor contactor used on a single-phase (1ø) dryer, is
located in the rear of the dryer, in the electrical panel
box. Its purpose is to transfer the higher voltage to the
motor, when the contactor coil voltage has been achieved.
Q. NON-REVERSING CONTACTOR (3Ø MOTOR)
The non-reversing contactor is used on 3-phase (3ø)
non-reversing dryers and is located on the upper left
hand side of the dryer (view from the rear). Its purpose
is to transfer the higher voltage to the motor, when the
contactor coil voltage has been achieved.
R. REVERSING RELAY PANEL
This panel is located in the back of the dryer at the upper
left hand corner. On this panel is an arc suppressor (A.S.)
board, which filters out “noise” that might go to the coils
of the contactors. Also, mounted on this panel are the
drive and blower/fan contactors. The 2-pole circuit
breaker is used to protect L1 and L3 on 460-480 VAC
models only. The transformer is stepping down the
incoming voltage to 24 VAC, to supply the voltage to the
computer and controls.
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S. HI-LIMIT THERMOSTAT (GAS AND ELECTRIC MODELS ONLY)
The hi-limit thermostat is another safety device that we use on gas and electric models. The hi-limit is located in
the burner or oven area. The hi-limit switch cuts off the heat, if the temperature exceeds 290° for electric
models or 330º for gas models. The only way this device would shut off the heat, is when the airflow changes
to the extent of making the flame brush up against it.
15
SECTION V
SERVICING
IMPORTANT: YOU MUST DISCONNECT AND LOCKOUT THE ELECTRIC SUPPLY
AND THE GAS SUPPLY BEFORE ANY COVERS OR GUARDS ARE REMOVED
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FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUSTING,
INSTALLATION, OR TESTING OF ANY EQUIPMENT PER OSHA (Occupational Safety and
Health Administration) Standards.
WARNING: PERSONAL INJURY COULD RESULT.
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The information provided in this section should not be misconstrued as a device for use by untrained persons
making repairs. Service work should be performed by competent technicians in accordance with local, state,
and federal codes. When contacting the factory for assistance, always have the dryer model number and
serial number available.
CAUTION: Observe ALL safety precautions displayed on the dryer or specified in this manual
before and while making repairs.
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Before considering replacement, make sure that ALL connectors are in place and making proper contact.
Check input voltages and temperature sensor. After replacing any parts, or performing adjustments or service,
run through a complete cycle.
A. CONTROLS (COMPUTER)
TO REPLACE CONTROL PANEL ASSEMBLY
1. Disconnect power to the dryer.
2. Disconnect the J3, J4, J5, J6, and J8 harnesses from rear
of the computer by squeezing the top locking tabs and
pulling the connector straight back.
3. Disconnect the green ground wire from the computer.
4. To remove control panel assembly from the control
box, gently tap the bottom of the control panel
upward and lift off the hinges.
5. Install new control panel assembly by reversing the
procedure.
6. Be sure to check or reset programs.
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NOTE: Use caution when handling MP Controller. It can be easily damaged by static electricity.
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TO REPLACE COMPUTER
1. Discontinue power to the dryer.
2. Disconnect the J3, J4, J5, J6, and J8 harnesses from the
rear of the computer by squeezing the top locking tab
and pulling the connector straight back.
3. Disconnect the green ground wire from the computer.
4. Disconnect the keyboard (touch pad) ribbon from the
computer.
5. Remove the two (2) screws securing the computer to
the control panel and remove computer from the panel,
by pulling upwards on the corners.
6. Install the new computer by reversing this procedure.
7. Be sure to check or reset programs.
NOTE: Use caution when handling MP Controller. It can be easily damaged by static electricity.
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TO REPLACE KEYBOARD (TOUCH PAD) Refer to illustration above
1. Discontinue power to the dryer.
2. Swing the control panel open and unplug keyboard (touch pad) ribbon from the computer board.
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 of 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 selection (A through F).
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