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AD-25, 30, 50, 75 and 758
Service Manual
Phase 7.2 Non-Coin
American Dryer Corporation
88 Currant Road
Fall River MA 02720-4781 USA
Telephone: (508) 678-9000 / Fax: (508) 678-9447
e-mail: techsupport@amdry.com
www.amdry.com
ADC Part No. 450268
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Retain This Manual in a Safe Place for Future Reference This product embodies advanced concepts in engineering, design, and safety. If this product is properly maintained, it will provide many years of safe, efficient, and trouble free operation. Only qualified technicians should service this equipment. OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation manual included with the dryer. The following “FOR YOUR SAFETY” caution must be posted near the dryer i
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Table of Contents IMPORTANT You must disconnect and lockout the electric SECTION I supply and the gas supply or the steam supply IMPORTANT INFORMATION ........................... 4 A. Safety Precautions ............................................................ 4 before any covers or guards are removed from the machine to allow access for cleaning, SECTION II adjusting, installation, or testing of any ROUTINE MAINTENANCE ............................... 5 A. Cleaning ...........................
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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 co
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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 provid
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6 MONTHS Inspect and remove lint accumulation in the customer furnished exhaust ductwork system. Inspect exhaust draft dampers to ensure they are not binding. Inspect and remove ALL lint accumulation from in and around control box area including coin acceptors. Clean lint accumulation from around tumbler wrapper area. IMPORTANT: THE ACCUMULATION OF LINT IN THE EXHAUST DUCTWORK CAN CREATE A POTENTIAL FIRE HAZARD. AS REQUIRED In the cleaning and care of the cabinet, avoid using harsh abrasives.
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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/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.2-M91 (Liquid Pr
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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
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C. OPERATIONAL SERVICE CHECK PROCEDURE After performing any service or maintenance function, an operational check should be performed to ensure that ALL components are performing properly. 1. Make a complete operational check of ALL the operating controls to assure that the timing is correct, temperature selection switches are functioning, etc. 2. Make a complete operational check of ALL safety related circuits, door switch(es), hi-limit thermostat, sail switch, cycling thermostats, etc. 3. On
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SECTION IV DESCRIPTION OF PARTS 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 keypad. The keypad 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)
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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 ensures 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
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G. TUMBLER BEARING AND PULLEY ARRANGEMENT The 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 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
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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 Btu), gas valve (which can be set
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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 ele
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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 voltag
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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. 16 American Dryer Corp. 450268-1
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SECTION V SERVICING IMPORTANT: YOU MUST DISCONNECT AND LOCKOUT THE ELECTRIC SUPPLY AND THE GAS SUPPLY BEFORE ANY COVERS OR GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLATION, OR TESTING OF ANY EQUIPMENT PER OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION (OSHA) STANDARDS. WARNING: PERSONAL INJURY COULD RESULT. The information provided in this section should not be misconstrued as a device for use by untrained persons making repairs. Service work should be pe
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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 keypad 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
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TO REPLACE COMPUTER TEMPERATURE SENSOR PROBE 1. Discontinue power to the dryer. 2. Remove microprocessor sensor bracket assembly from the dryer. a. Disconnect sensor bracket harness connector. b. Loosen the two (2) Phillips head screws securing the bracket assembly to the dryer and remove the bracket from the dryer. NOTE: DO NOT remove screws. 3. Disassemble the sensor probe from the bracket assembly by removing the top push on fastener securing the probe to the bracket. Use a small screwdriver
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B. BURNER CONTROLS (GAS) This illustration is typical of ALL gas burners, but they are not ALL exactly alike. Your particular model may have some differences. TO REPLACE SPARK IGNITOR 1. Discontinue power to the dryer. 2. Disconnect high voltage connector and flame-probe connection from ignitor. 3. Disassemble ignitor from burner by removing the two (2) self-tapping screws. 4. Reverse procedure for installing the new ignitor probe. NOTE: Before reestablishing power to the dryer, visually check
