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American Dryer Corp. AD-758 Service Manual

American dryer corp.clothes dryer service manual
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AD-758
Service Manual
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
052802ASILVA/mcronan
ADC Part No. 450418

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Summary of Contents for American Dryer Corp. AD-758

  • Page 1 AD-758 Service Manual 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 052802ASILVA/mcronan ADC Part No. 450418...
  • Page 2 For your convenience, log the following information: MODEL NO. __________________________________________ “IMPORTANT NOTE TO PURCHASER” POUR VOTRE SÉCURITÉ Ne pas entreposer ni utiliser d’essence ni d’autres vapeurs ou liquides inflammables à proximité de cet appareil ou de tout autre appareil. AD-758...

  • Page 3: For Your Safety

    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.
  • Page 4 DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER OR SCREEN IN PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED. 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.

  • Page 5: Table Of Contents

    SECTION I IMPORTANT INFORMATION ... 3 A. Safety Precautions ... 3 SECTION II ROUTINE MAINTENANCE ... 5 A. Cleaning ... 5 B. Adjustments ... 6 C. Lubrication... 6 SECTION III INSTALLATION REQUIREMENTS ... 7 A. Enclosure, Air Supply, and Exhaust Requirements... 7 B.
  • Page 6 SECTION V SERVICING ... 16 Introduction... 16 A. Computer Controls ... 17 B. Ignition Controls ... 18 C. Thermostats ... 22 D. Sail Switch Assembly (Gas Models Only) ... 23 E. Front Panel and Main Door Assemblies ... 24 F. Pulleys ... 27 G.

  • Page 7: Important Information

    IMPORTANT INFORMATION A. SAFETY PRECAUTIONS WARNING: For your safety, the information in this manual must be followed to minimize the risk of fire or explosion or to prevent property damage, personal injury, or loss of life. WARNING: The dryer must never be operated with any of the back guards, outer tops, or service panels removed.
  • Page 8 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 rubber materials. Drying in a heated basket (tumbler) may damage plastics or rubber and may be a fire hazard.

  • Page 9: Routine Maintenance

    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.

  • Page 10: Adjustments

    90 DAYS Remove lint from basket (tumbler), drive motors, and surrounding areas. Remove lint from gas valve burner area with a dusting brush or vacuum cleaner attachment. NOTE: To prevent damage, avoid cleaning and/or touching the ignitor/flame-probe assembly. Remove lint accumulation from inside control box and at rear area behind control box. 6 MONTHS Inspect and remove lint accumulation in customer furnished exhaust ductwork system and from dryer’s internal exhaust ducting.

  • Page 11: Installation Requirements

    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 Propane [L.P.] Gas) or LATEST EDITION (for General Installation and Gas Plumbing) or Canadian Electrical Codes Parts 1 &...

  • Page 12: Electrical And Gas Requirements

    B. ELECTRICAL AND GAS 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.
  • Page 13 NOTE: Pressing keyboard (touch pad) “A,” “B,” “C,” “D,” or “F” will also start the dryer. Six (6) preprogrammed drying cycles (“A” through “F”) have been stored in the computer’s memory. (Refer to the Computer Operator’s Manual for details.) 3. Make a complete operational check of ALL the operating controls to assure that the timing is correct, temperature selection switches are functioning, etc.

  • Page 14: Description Of Parts

    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 keyboard (touch pad). The keyboard (touch pad) inputs to the computer what temperature and program has been selected.

  • Page 15: Direct Spark Ignition (Dsi) Module (Gas Models Only)

    D. DIRECT SPARK IGNITION (DSI) MODULE (GAS MODELS ONLY) The DSI module is a 24 VAC device designed to be the “controller” of the DSI system. When activated by the dryer controls, this module constantly monitors and controls the functions of the DSI system (i.e., spark activation, gas valve off and on, flame verification, etc.).

  • Page 16: Blower Motor And Impellor (Non-Reversing)

    G. BLOWER MOTOR AND IMPELLOR (NON-REVERSING) (Viewing from the front of the dryer). The blower motor is located on the back of the dryer at the lower right-hand corner. The impellor is a backward curved paddle wheel which is directly connected to the shaft of the blower motor.

  • Page 17: Basket (Tumbler)

    K. BASKET (TUMBLER) The basket (tumbler) consists of four (4) ribs and four (4) perforated panels, along with a front and back, which are screwed together as an assembly. The basket (tumbler) also consists of tie rods, which support the basket (tumbler) from the front to back.

  • Page 18: Hi-Limit (Gas Models Only)

    N. HI-LIMIT (GAS MODELS ONLY) A hi-limit thermostat is located at the burner. This is an automatic reset disc-type thermostat set at 330º F (166º C). If the flame in the burner should get too hot, this thermostat will shut off the burner.

  • Page 19: Lint Drawer Switch

    Q. 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 closed. This is a safety device and should never be disabled.

  • Page 20: Servicing

    INTRODUCTION ALL electrical/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.

  • Page 21: Computer Controls

    A. COMPUTER CONTROLS To Replace Computer 1. Discontinue electrical power to the dryer. 2. Disconnect main power harness from rear of computer by squeezing locking tab and pulling connector straight back. 3. Disconnect the green ground wire from the computer. 4.

  • Page 22: Ignition Controls

    To Replace Microprocessor Temperature Sensor Probe 1. Discontinue electrical power to the dryer. 2. Remove lint drawer. Remove two (2) screws securing lint door and remove lint door. 3. Remove microprocessor sensor bracket assembly from the dryer. a. Disconnect sensor bracket harness connector. b.
  • Page 23 NOTES: Before reestablishing power to the dryer, visually check the following (refer to the illustration): 1. The flame electrode, ignitor electrode, and ground rod are ALL on the same line axis. 2. There should be a 1/8” gap (+/- 1/32”) between the ignitor electrode and ground rod. 3.
  • Page 24 2. Unscrew main burner orifices and replace. NOTE: Use extreme care when removing and replacing orifices. These orifices are made of brass and are easily damaged. 3. Reversing the removal procedure for reinstalling. NOTE: Test ALL connections for leaks by brushing on a soapy water solution. NEVER TEST FOR LEAKS WITH A FLAME.
  • Page 25 To Convert from Natural Gas to Liquid Propane (L.P.) Gas NOTE: ALL dryers are sold as natural gas, unless otherwise specified at the time the dryer order was placed. For L.P. gas the dryer must be converted as follows. 1. Refer to “Replace Gas Valve” and follow steps 1 through 6. 2.

  • Page 26: Thermostats

    To Replace Direct Spark Ignition (DSI) Module 1. Discontinue electrical power to the dryer. 2. Remove the wires connected to the terminal strip at the bottom of the module. 3. Remove the four (4) screws securing the module to the mounting bracket. 4.

  • Page 27: Sail Switch Assembly (Gas Models Only)

    To Replace Lint Compartment Hi-Heat Protector (225º F [107º C]) Thermostat This thermostat is part of the “sensor bracket assembly” and is secured to the underside of the basket (tumbler) wrapper in the lint compartment. As a safety device, this thermostat will open (shut off) the heating unit circuit if an excessive temperature occurs.

  • Page 28: Front Panel And Main Door Assemblies

    E. FRONT PANEL AND MAIN DOOR ASSEMBLIES To Replace Main Door Switch 1. Discontinue electrical power to the dryer. 2. Open main door. 3. Remove the two (2) Phillips head screws holding the main door switch bracket assembly in place. 4.
  • Page 29 To Install New Main Door Glass 1. Remove main door assembly from dryer (follow main door removal procedure). 2. Lay main door on flat surface with the front of the door facing up. 3. Remove the four (4) acorn nuts securing the glass. 4.
  • Page 30 To Replace Main Door Hinge Blocks 1. Discontinue electrical power to the dryer. 2. Follow procedure for removal of main door assembly. 3. Disassemble bottom hinge block from front panel by removing the Allen head screws located inside the hinge block. 4.

  • Page 31: Pulleys

    F. PULLEYS To Replace Basket (Tumbler) Pulley 1. Loosen V-belts. Rotate pulley and roll V-belts out of grooves. 2. Remove cap screws from the bushing. 3. Insert cap screws in tapped removal holes and tighten evenly until bushing becomes loose on shaft. (Refer to figure “A.”) 4.
  • Page 32 IMPORTANT: Tighten screws evenly and progressively. Never allow the sheave to be drawn in contact with the flange of the bushing. This gap should measure from 1/8” to 1/4”. Proper cap screw torque is 6 ft-lbs. (26.6 newtons), if greater tightening forces are applied, excess pressures will be created in the hub of the mounted sheave which may cause it to crack.

  • Page 33: Basket (Tumbler) Assembly

    5. Assemble bushing and sheave as shown in figure “B.” When cap screws are loosely inserted, bushing remains fully expanded to provide a sliding fit on the shaft. 6. Insert key on the shaft, then slide sheave to desired position with cap screw heads to the outside. 7.
  • Page 34 Basket (Tumbler) Alignment (Lateral) (Side to Side Adjustment) 1. Discontinue electrical power to the dryer. 2. Remove back guard. 3. Loosen rear pillow block bearing bolts (C). 4. Back off jam nuts on the two (2) lateral adjustment bolts (A) and (B). 5.

  • Page 35: Bearings (Refer To The Illustrations In Section F "Pulleys")

    IMPORTANT: Never strike the shaft directly with a hammer. 8. Remove basket (tumbler) from basket (tumbler) support. a. Remove the bolt in the center of the basket (tumbler) back wall. b. Loosen and remove the eight (8) sets of nuts and washers from basket (tumbler) tie rods. Remove the eight (8) tie rods.
  • Page 36 To Replace Front Basket (Tumbler) Support Pillow Block Bearing 1. Discontinue electrical power to the dryer. 2. Remove back guard. 3. Follow steps 3 through 6 from “To Replace Rear Basket (Tumbler) Support Pillow Block Bearing.” 4. Remove the two (2) retaining rings from the basket (tumbler) shaft. 5.

  • Page 37: V-Belts (Refer To The Illustrations In Section F "Pulleys")

    To Replace Rear Idler Shaft Pillow Block Bearing 1. Follow steps 1 through 3 from “To Replace Front Idler Shaft Pillow Block Bearing.” 2. Remove retaining rings on each side of forward idler shaft pillow block bearing. 3. Loosen the two (2) setscrews on each bearing collar. 4.

  • Page 38: Motors And Impellors

    V-Belt Tension Adjustment (Motor to Idler) 1. Discontinue electrical power to the dryer. 2. Loosen the nuts on the four (4) studs holding the drive motor mount to the back of the dryer. 3. Loosen the jam nuts on the adjustment screw on the top of the motor mount. 4.
  • Page 39 To Replace Impellor Motor (Direct Drive) 1. Discontinue electrical power to the dryer. 2. Disconnect motor harness from motor. 3. Remove nuts and washers holding the motor mount to the rear of the dryer and pull motor mount away. 4. Remove the two (2) left handed jam nuts on the motor shaft retaining the impellor.

  • Page 40: To Replace Lint Drawer Switch

    To Replace Impellor 1. Discontinue electrical power to the dryer. 2. Remove the left side panel to access the fan shaft mount assembly. 3. Remove the two (2) left handed jam nuts that hold the impellor to the fan shaft. 4.

  • Page 41: Troubleshooting

    The information provided will help isolate the most probable component(s) associated with the difficulty described. The experienced technician realizes, however, that a loose connection or broken or shorted wire may be at fault where electrical components are concerned – not necessarily the suspect component itself. ELECTRICAL PARTS SHOULD ALWAYS BE CHECKED FOR FAILURE BEFORE BEING RETURNED TO THE FACTORY.
  • Page 42 D. Drive motor runs, burner is on, but basket (tumbler) will not turn... 1. Broken, damaged or loose V-belt. 2. Belts are contaminated (oil, grease, etc.). 3. Loose or broken pulley. E. Drive motor and blower motor start, computer display heat indicator is on, but there is no heat... 1.
  • Page 43 4. Poor housekeeping. Dirty or clogged lint screen. 5. Extractors (washers) are not performing properly. 6. An exceptionally cold/humid or low barometric pressure atmosphere. 7. The supply gas may have a low heating value, check with local gas supplier. 8. Failed temperature sensor (temperature calibration is incorrect). 9.
  • Page 44 L. Display reads “dSFL,” dryer sensor circuit failure... 1. Check 1/8-amp fuse on computer. 2. Faulty microprocessor temperature sensor probe. 3. Open circuit in either one (1) of two (2) wires leading from the sensor probe to the computer. a. Connection at sensor bracket assembly connector. b.

  • Page 45: Electrical Troubleshooting

    ELECTRICAL TROUBLESHOOTING The information provided will help isolate the most probable components associated with the difficulty described. The experienced technician realizes, however, that a loose connection or broken or shorted wire may be at fault where electrical components are concerned, not necessarily the suspect component itself. ELECTRICAL PARTS SHOULD ALWAYS BE CHECKED FOR FAILURE BEFORE BEING RETURNED TO THE FACTORY.

  • Page 46: Display Indicators

    NOTE: Once the Phase 5 OPL 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 automatically be cancelled. 3.
  • Page 47 Phase 5 OPL Microprocessor Controller (Computer) Relay Output Light Emitting Diode (L.E.D.) Indicators There are a series of five (5) L.E.D. indicators (red lights) located at the lower back side area of the Phase 5 OPL microprocessor controller (computer). These are identified or labeled in the illustration as “HEAT,”...

  • Page 48: Display/Codes

    1) If the motor is not operating and the “MTR” output indicator is on; then the problem (fault) is elsewhere (i.e., external to the Phase 5 OPL microprocessor controller [computer]). 4. “FWD” Output Light Emitting Diode (L.E.D.) Indicator (for Optional Reversing Models Only) a.
  • Page 49 Illus. No. 3 - BLOWER MOTOR INDICATOR - This indicator dot is on whenever a cycle is in progress. In addition, when the anti-wrinkle program is active, this indicator will be on whenever the microprocessor controller (computer) is in the guard program. Illus.
  • Page 50 L.E.D. DISPLAY CODES Slope Factor AUtO Automatic Mode (Patent No. 4,827,627) ArEv Always Reverse Heat Loss (offset) Factor Buzzer (tone) bUZ–tinE Buz Time º CEL Degree in Celsius Cool Down Cycle in Progress COOL-tinE Cool Down Time COOL-tEnP Cool Down Temperature CY A Preprogrammed Cycle A CY b...
  • Page 51 FILL No Cycle in Progress Flash Display Active GdLY Anti-Wrinkle Delay Time G on–tInE Anti-Wrinkle On Time Anti-Wrinkle Program Active Overheating Condition MAnU Manual Mode MGrd Maximum Guard Time nbUZ No Buzzer (tone) nFLS No Flash Display nGrd Anti-Wrinkle Program Is Not Active nrEu No Reverse ProG...

  • Page 52: Computer Logic And Wiring Diagram

    FAULT CODES 1. door - Keyboard (touch pad) entry was made while the main door or lint drawer was open or fault in the circuit. 2. dSFL - Fault in microprocessor temperature sensor circuit. 3. SEFL - Fault in rotation of basket (tumbler). 4.
  • Page 53 A. No display condition... 1. Check main fuses or circuit breaker. 2. Check blower motor overload, if tripped, reset. 3. Check fuse 1 or fuse 2 and if either are blown, replace. 4. Across terminal block nos. 6 and 8 you should be getting your 208V or 240V. If no voltage is present at 6 and 8, double check steps 1 and 2 and also check wires and terminations at these points.
  • Page 54 C. Drive motor works in forward mode but does not reverse, blower motor runs... 1. If computer dot (second one [1] from left) does not come on, check program to see if set for reverse. 2. If set for reverse, replace computer. 3.
  • Page 55 E. “No Heat” drive and blower motors run, display reads normal (Gas Models)... 1. Check for voltage across terminal block nos. 3 and 7. If no voltage is present, problem is bad wire or broken terminal from terminal block no. 3 to MP harness connector pin 4.
  • Page 56 G. “Door” condition... NOTE: Make sure main door and lint drawer are closed. Also, if checking either switch, the plunger must be depressed. Check light emitting diode (L.E.D.) input light “door” on component side of the computer. If light is on, replace computer.

  • Page 57: Technical Information

    TECHNICAL INFORMATION The following section contains various technical information important to the service person in servicing and maintaining the dryer. A. MOTOR DATA LABEL (HIGH AND LOW VOLTAGE) The motor plate is located on the side of the drive motor (refer to the illustration above) and contains a graphical representation of the motor wiring for both low voltage rating and high voltage rating.

  • Page 58: Data Label

    B. DATA LABEL Contacting American Dryer Corporation When contacting ADC, certain information is required to insure proper service/parts information. This information is on the data label, located on the top left hand corner of the dryer, viewed from the rear (refer to the illustration above).

  • Page 59: Using A Manometer

    C. USING A MANOMETER How To Use A Manometer 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 below). 3.

  • Page 60: Tool List

    D. TOOL LIST Straight Head Screwdriver Phillips Head Screwdriver Sensor Pin and Socket Tool (P/N 122801) Pliers 1/4” Nut Driver 3/8” Open End Wrench 5/8” Open End Wrench 5/8” Deep Socket Wrench 3/8” Socket Wrench 1/2” Socket or Open End Wrench 1/4”...
  • Page 61 ADC 450418 1 - 06/16/02-20...

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