1. Manuals
  2. Brands
  3. American Dryer Corp. Manuals
  4. Laundry Accessories
  5. ML-145
  6. Service manual

American Dryer Corp. ML-145 Service Manual

American dryer corporation ml-145/ml-170 phase 6 microprocessor controls and timer controls product manual
Hide thumbs
Table of Contents

Advertisement

Quick Links

ML-145 / ML-170
Service Manual
Phase 6 Microprocessor Controls
and
Timer 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
122999SL/tcosta
ADC Part No. 450429

Advertisement

Table of Contents
loading

Related Manuals for American Dryer Corp. ML-145

Summary of Contents for American Dryer Corp. ML-145

  • Page 1 ML-145 / ML-170 Service Manual Phase 6 Microprocessor Controls Timer 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 122999SL/tcosta ADC Part No. 450429...
  • 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 dans le voisinage de cet appareil ou de yout autre appareil. ML-145 / ML-170...

  • 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, ADJUST- ING, INSTALLATION, or TESTING OF ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) STANDARDS.
  • Page 4 The dryer must never be operated with any of the back guards, outer tops, or service panels removed. PERSONAL INJURY or FIRE COULD RESULT. DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER/SCREEN IN PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED. PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment and/or specified in the installation and operator's manual included with the dryer.

  • 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 ... 16 B. Ignition Controls ... 18 C. Thermostats... 21 D. Sail Switch Assembly (Gas Models Only) ... 22 E. Front Panel and Main Door Assemblies... 23 F. Pulleys ... 25 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 tumbler (basket) may damage plastics or rubber and also 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 duct work system. The frequency of cleaning can best be determined from experience at each location.

  • Page 10: Adjustments

    NOTE: To prevent damage, avoid cleaning and/or touching 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 duct work 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: National Fuel Gas Code ANSI.Z223.1-LATEST EDITION or National Electrical Code ANSI/NFPA No. 70-LATEST EDITION, or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.2-M91 (L.P.

  • Page 12: Operational Service Check Procedure

    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. The gas dryer installation must meet the American National Standard, National Fuel Gas Code ANSI Z223.1- LATEST EDITION, or in Canada, the Canadian Electrical Codes Parts 1 &...
  • Page 13 NOTE: Water column pressure requirements (measured at the pressure tap on the gas valve body): Natural Gas - 3.5 inches water column (8.7 mb). L.P. Gas - 10.5 inches water column (26.1 mb). 6. If computer program changes are required, refer to the Phase 6 OPL Operator’s Manual (ADC Part No.

  • Page 14: Description Of Parts

    SECTION IV DESCRIPTION OF PARTS A. CONTROL PANEL (MICROPROCESSOR) Opening the control panel will allow access to the major components which include the microprocessor computer board and the keyboard (touchpad). The keyboard (touchpad) inputs to the computer what temperature and program has been selected.

  • Page 15: Hsi (Hot Surface Ignition) Module (Gas Models Only)

    D. HSI (HOT SURFACE IGNITION) MODULE (Gas Models ONLY) The HSI (Hot Surface Ignition) system consists of a microprocessor (computer) based control module, along with an ignitor/flame-probe assembly. This control utilizes a 24 V carbide ignitor and a rectified flame sensor/probe signal to locally control ALL basic functions in the gas burner.

  • Page 16: Blower Motor And Impellor (Gas And Steam)

    G. BLOWER MOTOR and IMPELLOR (GAS and STEAM) The impellor is shaft driven. The blower motor drives the shaft on which the impellor is mounted. This enables the impellor to run at a higher RPM, thereby producing a higher airflow. (CFM). H.

  • Page 17: Tumbler (Basket)

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

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

    M. HI-LIMIT (Gas Models ONLY) A hi-limit thermostat is located at the burner. This is a manual 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. This is generally caused by low airflow through the dryer.

  • Page 19: Lint Drawer Switch

    P. 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 and 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 8. Reestablish electrical power to the dryer. To Replace Keyboard (Touchpad) Label Assembly 1. Discontinue electrical power to the dryer. 2. Unplug keyboard (touchpad) ribbon from rear of the microprocessor computer. 3. Slowly peel off and remove keyboard (touchpad) label assembly from control panel. 4.

  • Page 22: Ignition Controls

    B. IGNITION CONTROLS To Remove Hot Surface Ignitor (Refer to above burner illustration) 1. Discontinue electrical power to the dryer. 2. Disconnect the two (2) wires connecting the ignitor to the HSI module. 3. Disassemble ignitor from burner by removing the self tapping screw.
  • Page 23 7. Remove valve mounting bracket, manifold, and piping from gas valve. 8. Reverse procedure for installing new gas valve. WARNING: Test ALL connections for leaks by brushing on a soapy water solution. WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!! To Replace Main Burner Orifices 1.
  • Page 24 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.

  • Page 25: Thermostats

    5. Remove the screws securing the burner tube rest to the oven and remove this rest. 6. Remove screws securing the flame probe, and HSI Ignitor burner box cover plate to the oven. 7. Remove burner tubes by sliding them out. 8.

  • Page 26: 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 tumbler (basket) 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 27: Front Panel And Main Door Assemblies

    To Adjust Sail Switch With the dryer operating at a high temperature setting, pull the sail switch away from the burner. The sail switch should open and extinguish the burner. Let the sail switch damper return to the burner wall. The sail switch should close to restart the burner ignition cycle.
  • Page 28 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 29: Pulleys

    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.
  • Page 30 To Replace Small Idler Pulley 1. Loosen V-belts. Rotate pulley and roll V-belts out of grooves. 2. Remove cap screws from the bushings. 3. Insert cap screws in tapped removal holes and tighten evenly until bushing becomes loose on shaft. Refer to figure “A” on previous page. 4.

  • Page 31: Tumbler (Basket) Assembly

    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 15 ft-lbs. (20 Nm). 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 32 5. Turn these bolts clockwise (CW) evenly to raise tumbler (basket) or counterclockwise (CCW) evenly to lower tumbler (basket). 6. Rotate tumbler (basket) from front and check alignment with front door opening. 7. Leave a larger gap from the inside ring on the top of the front panel opening to the tumbler (basket) and a smaller gap on the bottom to compensate for the weight of the clothes when wet.

  • Page 33: Bearings

    5. Remove tumbler (basket) belts. 6. Remove tumbler (basket) pulley. 7. Remove tumbler (basket) assembly and support. a. Loosen the two (2) set screws on both the pillow block bearing collars. b. Remove the retaining rings from the grooves of the tumbler (basket) shaft.
  • Page 34 4. Loosen lateral adjustment jam nuts and bolts. (Refer to illustration in section G “Tumbler (Basket) Alignment”) 5. Loosen set screws (2) from rear pillow block bearing collar. 6. Remove the rear bearing bolts, securing bearing to bearing mount. Remove bearing. 7.

  • Page 35: V-Belts

    6. Slide bearing off the shaft. 7. Replace bearing by reversing procedure. 8. Align idler pulley with tumbler (basket) pulley before tightening bolts. 9. Reestablish electrical power to the dryer. To Replace Rear Idler Shaft Pillow Block Bearing 1. Follow Step #1 through Step #3 from “To Replace Front Idler Shaft Bearing.” 2.

  • Page 36: Motors

    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 37: Impellor

    9. Reestablish electrical power to the dryer. To Replace Impellor Motor (Fan Shaft Drive - Gas and Steam Models 50 & 60 Hz) 1. Discontinue electrical power to the dryer. 2. Remove drive belts. 3. Disconnect wiring harness from motor. 4.

  • Page 38: L. Lint Drawer Assembly

    L. LINT DRAWER ASSEMBLY To Replace Lint Screen 1. Pull out lint drawer. 2. Remove lint screen from lint drawer. 3. Drop new lint screen in place. 4. Slide lint drawer back into dryer. To Replace Lint Drawer Switch 1. Disconnect electrical power to the dryer. 2.

  • Page 39: Troubleshooting

    IMPORTANT: YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS SUPPLY or THE STEAM SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLATION, or TESTING OF ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) STANDARDS.
  • Page 40 C. Display is reading “Rotation Sensor Fail.” 1. Magnet and rotation read switch are out of adjustment. 2. Trunnion shaft has moved forward. 3. Magnet is missing. 4. Rotation read switch is broken. 5. Broken V-belt. 6. Faulty drive motor. 7.
  • Page 41 E. Display is reading “Sail Switch Fail.” 1. Sail switch is out of adjustment. 2. Sail switch is hung up. 3. Customer has an exhaust booster fan that draws too much air. 4. Faulty wiring connection between computer and sail switch. 5.
  • Page 42 I. Display is reading “Burner Control Failure.” 1. Faulty flame probe. 2. Faulty HSI (Hot Surface Ignition) module. 3. Faulty wiring connection between HSI module and gas valve or between gas valve and Phase 6 computer. 4. Faulty computer. J. Display is reading “Burner Flame Failure.” 1.
  • Page 43 N. Display is reading “Hot.” 1. Lint screen is dirty. 2. Exhaust is clogged. 3. Lint drawer is not closed ALL the way. 4. Faulty computer. 5. Faulty temp sensor. O. Dryer operates but is taking too long to dry... 1.
  • Page 44 Q. Overload for impellor (fan) motor is tripping... 1. Either an exceptionally low or high voltage supply. 2. Motor bearing failure. 3. Motor vents are blocked with lint. 4. Failed motor. 5. Failed overload. 6. Out of balance impellor (fan). 7.

  • Page 45: Electrical Troubleshooting

    SECTION VII 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: Phase 6 Opl System Diagnostics

    PHASE 6 OPL SYSTEM DIAGNOSTICS IMPORTANT: YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS SUPPLY or THE STEAM SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLATION, or TESTING OF ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) STANDARDS.
  • Page 47 6. bURNER CONTRL FAIL - This routine monitors the ignition control’s gas valve output response. If the valve output signal is not present from the ignition control within the valve time limits the Phase 6 microprocessor controller (computer) determines the ignition control has failed. If this occurs when the cycle is active the machine will display “bURNER CONTRL FAIL.”...

  • Page 48: Light Emitting Diode) Display Indicators

    11. ROTATE SENSOR FAIL - Indicates a rotational sensor circuit failure meaning that there is a fault somewhere in the tumbler (basket) rotating circuit, or the Phase 6 OPL microprocessor controller (computer) program related to this circuit (Program Location 2) is set incorrectly. In the active mode it should be (ROTATE SENSOR ACTIVE), if the dryer is not equipped with the optional rotational sensor it should be set in the nonactive mode (No ROTATE SENSOR).

  • Page 49: Phase 6 Opl Microprocessor Controller (Computer) Relay Output L.e.d. (Light Emitting Diode) Indicators

    4. L.E.D. DISPLAY INDICATOR NUMBER 4 a. On Indicator: 1) This indicator dot is on whenever a cycle is in progress. Additionally, when the Anti-Wrinkle program is active, the indicator dot will be on whenever the Phase 6 OPL microprocessor controller (computer) is in the Guard On Time program.
  • Page 50 1. “FAN” (BLOWER) Output L.E.D. (light emitting diode) Indicator a. If the dryer is started and the blower motor is not operating, yet both the Phase 6 OPL microprocessor controller (computer) display fan indicator dot and power supply input L.E.D. are on, but the fan output L.E.D.
  • Page 51 “FUSE” (MAIN FUSE) Input L.E.D. Indicator a. Should be on ALL the time (even if the dryer is not running). If the L.E.D. (light emitting diode) is not on; then the display will read “CHECK MAIN FUSE.” If the main fuse is good then the fault is on the Phase 6 microprocessor controller (computer).
  • Page 52 12. “FLAME” (bURNER CONTROL FAIL) Input L.E.D. Indicator a. This routine monitors the ignition control’s gas valve output response. If the valve output signal is not present from the ignition control within the valve time limits the microprocessor determines the ignition control has failed.

  • Page 53: Display/Codes

    L.E.D. DISPLAY/CODES The L.E.D. (light emitting diode) display informs the operator of cycle status, program verification, and displays important diagnostic codes and fault codes. A. L.E.D. DISPLAY OPERATING STATUS 1. Cycles in Progress a. While the dryer is operating, the L.E.D. display will read which cycle is in progress. For example, in Drying Cycle (Mode), the L.E.D.

  • Page 54: Phase 6 Opl Microprocessor L.e.d. Displays

    1) Illustration No. 1 a) FORWARD INDICATOR - this indicator dot is functional for dryer models with the Reversing Action Option ONLY. This indicator dot will be on when the tumbler (basket) is in the forward (clockwise [CW]) direction. Additionally, when the Anti-Wrinkle Program is active, this indicator dot will be on whenever the Phase 6 OPL microprocessor controller (computer) is in the Guard On Time Program (Mode).

  • Page 55: Codes

    C. L.E.D. CODES 1. Display Codes ALL REV ANTI WRINKL dELAY TIME ANTI WRINKL GUARd ACTIVE ANTI WRINKL GUARd ON TIME AUTO CYCLE bURNER CONTROL FAIL bURNER FLAME FAIL bURNER SAFETY FAIL bUZZ bUZZ TIME CHECK MAIN FUSE CLEAN LINT COOL COOL TIME_M COOL TEMP_...
  • Page 56 2. Fault Codes bURNER CONTROL FAIL - GAS MODELS ONLY POWER (24 VAC) IS NOT EVIDENT AT GAS VALVE bURNER FLAME FAIL - The Phase 6 Microprocessor Controller (Computer) DOES NOT SENSE FLAME VERIFICATION (GAS MODEL ONLY) bURNER SAFETY FAIL - GAS/ELECTRIC ONLY BURNER/OVEN OPEN HI-LIMIT CIRCUIT dRUM SAFETY FAIL - Fault in the TUMBLER (BASKET) HI-LIMIT CIRCUIT...

  • Page 57: Computer Logic And Wiring Diagram

    D. COMPUTER LOGIC and WIRING DIAGRAM 1. Operator enters desired selection(s). 2. Information entered is sent to the microcontroller via the keyboard (touchpad). 3. The input information is sorted/processed and executed by the microcomputer chip. 4. The microcomputer output signal activates the contactors and HSI (Hot Surface Ignition) module which control machine functions.
  • Page 58 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. Check to make sure “EMERGENCY STOP” (E-Stop) button is not depressed. 5.
  • Page 59 C. Drive motor works in forward mode but does not reverse, blower motor runs... 1. If computer dot (second one from left) does not come on, check program to see if set for reverse. 2. If set for reverse, replace computer. 3.
  • Page 60 E. “No Heat” Drive and Blower Motors Run (Gas Models)... 1. Check for voltage across L1 and GND of the HSI module. If no voltage is present, then check for voltage from terminal #14 on the blower contactor to ground. If no voltage is present, the problem is with blower contactor.
  • Page 61 G. “Door” Condition NOTE: Make sure main door is closed. Also, if checking either switch, the plunger must be depressed. 1. Check L.E.D. (light emitting diode) input light “door” on the component side of the computer. If the light is on, replace the computer. 2.

  • Page 62: Technical Information

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

  • Page 63: Data Label

    B. DATA LABEL Contacting American Dryer Corporation (ADC) When contacting ADC, certain information is required to insure proper service/parts information. This information is on the data label, located on the top right corner of the dryer, viewed from the rear (refer to illustration). When contacting ADC, please have the model number and serial number readily accessible.

  • Page 64: Use 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 illustration). 3. Attach manometer to dryer using magnet. NOTE: Place manometer in a position so that readings can be taken at eye level.

  • Page 65: Ml-170 Tool List

    D. ML-170 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 66 ADC 450429 1- 02/18/00-25...

This manual is also suitable for:

Ml-170

Table of Contents