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.
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.
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. “Caution: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper 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/SCREEN IN PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED. IMPORTANT PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment and/or specified in the installation and operator's manual included with the dryer.
Table of Content SECTION I IMPORTANT INFORMATION .......................................................................... 3 A. Safety Precautions ...................................................................................................................... 3 SECTION II ROUTINE MAINTENANCE .............................................................................. 5 A. Cleaning ......................................................................................................................
SECTION V SERVICING ....................................................................................................... 16 Introduction.................................................................................................................................... 16 A. Computer Controls ................................................................................................................... 16 B. Ignition Controls ............................................................................
SECTION I 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. PERSONAL INJURY or FIRE COULD RESULT. 1. DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. 2.
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. 7. A program should be established for the inspection and cleaning of lint in the heating unit area, exhaust duct work, and inside the dryer.
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 duct work 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.
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. WARNING: THE ACCUMULATION OF LINT IN THE EXHAUST DUCT WORK CAN CREATE A POTENTIAL FIRE HAZARD. WARNING: DO NOT OBSTRUCT THE FLOW OF COMBUSTION and VENTILATION AIR.
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: 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.
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 Z223.1LATEST EDITION, or in Canada, the Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION (for Electrical Connections) as well as, local codes and ordinances, and must be done by a qualified technician.
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. 112147) for details. 7. The dryer should be operated through one complete cycle to assure that no further adjustments are necessary and that ALL components are functioning properly. 8.
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. The computer controls the entire operation of the machine. It accepts inputs and gives outputs to various parts throughout the machine. B.
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. E.
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. IDLER ASSEMBLY (Viewing from the rear of the dryer.) The idler assembly is located approximately on the lower center of the dryer. The idler assembly consists of two (2) idler pulleys, the small and large pulleys.
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. The tumbler (basket) support is used to mate the tumbler (basket) to the drive system in the rear. K. MAIN DOOR SWITCH The main door switch is located in the main door hinge block.
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. N. AUTOMATIC RESET THERMOSTAT This is located inside the dryer in the lint compartment above the lint drawer. This thermostat senses the heated air after it has passed through the tumbler (basket).
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. Q. STEAM DAMPER SYSTEM The newest type system is called the steam damper.
SECTION V 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. Service work should be performed by competent technicians in accordance with local, state, and federal codes.
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. Peel paper backing off new keyboard (touchpad) label assembly. 5.
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. 4. Reverse procedure for installing new ignitor. To Remove Flame Probe Assembly 1. Discontinue electrical power to the dryer. 2. Disconnect the wire attaching the flame probe to the HSI module. 3.
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. Referto“ToReplaceGasValve”andfollow Step #1 through Step #6. 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.
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 W.C. pressure cannot be achieved, problems may be due to an undersized gas supply line, a faulty or underrated gas meter, etc. To Convert from Natural Gas to L.P.
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. Replace by reversing procedure. WARNING: Test ALL connections for leaks by brushing on a soapy water solution. WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!! To Replace HSI (Hot Surface Ignition) Module 1. Discontinue electrical power to the dryer. 2.
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. The dryer motors will remain on, even if the thermostat is open. IMPORTANT: UNDER NO CIRCUMSTANCES should heat safety devices be disabled. 1.
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. If the sail switch circuit does not operate as described, bend the actuator arm of the sail switch accordingly until proper operation is achieved.
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. Remove glass and clean ALL old sealant off main door. This area must be completely cleaned for correct bonding. 5. Apply a narrow bead of silicone (ADC P/N 170730) ALL around main door area where glass will rest. 6.
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. Reassemble by reversing removal procedure. 5. Reestablish electrical power to the dryer. F. PULLEYS To Replace Tumbler (Basket) Pulley 1. Loosen V-belts. Rotate pulley and roll V-belts out of grooves. 2. Remove cap screws from the bushings. 3.
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. Remove bushing, pulley, and key. 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.
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. To Replace Motor Pulley 1. Loosen V-belts. Rotate pulley and roll V-belts out of grooves. 2. Remove cap screws from bushing. 3.
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. 8.
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. c. Remove the tumbler (basket) and support assembly from the front of the dryer. If the tumbler (basket) cannot be removed freely, clean the shaft area and spray WD-40 or similar lubricant.
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. Replace by reversing Step #3 through Step #6. 8. Adjust both lateral and vertical tumbler (basket) alignment. 9. Replace back guard. 10. Reestablish electrical power to the dryer.
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. Remove retaining rings on each side of forward idler shaft pillow block bearing. 3. Loosen the two (2) set screws on each bearing collar. 4. Slide both bearings off the shaft. 5.
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. Turn the adjustment screw to lower the motor mount (to tighten the belts) or raise the motor mount (to loosen the belts). 5. Check the vertical plane of the motor pulley and idler pulley for parallel alignment. 6.
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. Remove bolts holding motor to mount and replace with new motor. DO NOT tighten bolts. 5. Remove pulley from old motor and install on new motor. 6. Align motor pulley with fan shaft pulley and tighten bolts. 7. Replace belts and adjust belt tension. 8. Retighten bolts. 9.
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. Remove lint drawer and lint door. 3. Disconnect both 4-pin connectors at the rear of the lint switch cover. 4. Remove the pal nut holding the lint switch cover on. 5. Remove lint switch cover and disconnect the two (2) terminals of the switch. 6.
SECTION VI 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. The information provided will help isolate the most probable component(s) associated with the difficulty described.
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. Faulty wiring connection between read switch and computer. 8. Faulty drive contactor. 9. Faulty computer (computer is not sensing rotation). 10. Faulty arc suppressor (A.S.) board. D. Display is reading “NO Airflow.” 1. Blower motor is not coming on. 2.
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. Faulty computer. F. Display is reading “Drum Safety Fail” 1. Open tumbler (basket) hi-limit which is 225º F (107º C). 2. Faulty wiring connection between computer and tumbler (basket) hi-limit. 3. Faulty computer. G. Display is reading “Burner Safety Fail.” 1.
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. Clogged lint screen. 2. Clogged exhaust. 3. Faulty HSI module. 4. Faulty gas valve. 5. Dirty burner tubes. K. Display is reading “Main Door.” 1. Faulty main door switch. 2.
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. An inadequate exhaust duct work system. 2. Restriction in exhaust system. 3. Insufficient make-up air. 4. Poor housekeeping. a. Dirty or clogged lint screen. 5. Washing machine extractors are not performing properly. 6. An exceptionally cold/humid or low barometric pressure atmosphere. 7.
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. Insufficient make-up air. R. There is excessive vibration coming from the tumbler (basket)... 1. Tumbler (Basket) is out of adjustment. 2. Loose or broken tie rod. 3. Failed tumbler (basket) support.
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.
SECTION VIII 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. ALL major circuits, including door, microprocessor temperature sensor, heat and motor circuits are monitored.
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.” If the tumbler (basket) temperature is above 100º F (38º C) the machine will continue to display “bURNER CONTRL FAIL.
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).
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. 5. L.E.D. DISPLAY INDICATOR NUMBER 5 a. Air Jet Circuit Indicator - OPTIONAL 1) This indicator dot is on at the end of the dryer cycle for approximately 60 seconds. C.
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. is off, then the fault is the Phase 6 OPL microprocessor controller (computer) itself. 1) If the motor is not operating and the fan indicator dot and output L.E.D. are on, then the problem (fault) is elsewhere (i.e.
6. “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). 7. “LINT” (LINT DOOR) Input L.E.D. Indicator a. Should be on ALL the time (unless the lint door is opened then the “LINT” L.E.D. indicator will go out). b.
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. If this occurs when the cycle is active the “FLAME” output L.E.D. (light emitting diode) indicator will go out and the display will read “bURNER CONTRL FAIL.
SECTION IX 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. display will read “dRYING” and in the Cool Down Cycle (Mode) the L.E.D. display will read “COOL.” 2. Cycle Status a.
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). 2) Illustration No.
C. L.E.D. CODES 1.
2.
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.
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. Across nos. 6 and 8 you should be getting your 208 V or 240 V. The J12 connector pin 1 and 3 you should be getting 24 V. If no voltage is present double check Step #1 through Step #4 and also check wires and terminations at these points. 6.
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. Check for voltage across the coil of the reversing contactor located in the rear panel box. The contactor according to your diagram is CR3, also the markings on the coil are A1 and A2. If there is voltage, replace the coil or the complete contactor.
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. If voltage is present, the problem is faulty wire or termination between blower contactor and HSI module. 2. If voltage is present, check for voltage across terminal “W” and “GND” of the HSI module.
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. Check voltage (24 VAC) between pin 5 and ground of the J7 9 pin connector. If no voltage is present, the problem is faulty computer. If voltage is present, check for voltage between pin 6 and ground of the J7 9 pin connector.
SECTION X 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. Removing the cap reveals the wiring to the motor.
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. Information on the Data Label a.
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. 4. Fill manometer with water, 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.
D.
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