American Dryer Corp. AD-840 Service Manual Download Page 53

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SEFL

Rotational Sensor Circuit Failure

SEn

Rotational Sensor Selected

SPIn-tInE

Spin Time

Select Reverse

StoptInE

Stop Time

tEnP-tInE

Temperature Display Time

tinE

Time

Fault Codes

door

- Keyboard entry was made while the main door or lint drawer was open or fault in the

circuit

dSFL

- Fault in microprocessor temperature sensor circuit.

SEFL

- Fault in rotation of basket (tumbler).

Hot

- Indicates that the dryer has experienced an overheating condition. To cancel the "Hot"

default code, press the "Clear/Stop" key.

D. Computer Logic and Wiring Diagram

1. Operator enters desired selection(s).

Summary of Contents for AD-840

Page 1: ...ration 88 Currant Road Fall River MA 02720 4781 Telephone 508 678 9010 Fax 508 678 9447 E mail techsupport amdry com 123096MFM tf ADC Part No 450400 AD 170 Service Manual Phase 5 Microprocessor Controls and Timer Controls ...

Page 2: ...ime without notice or obligation in prices specifications colors and material and to change or discontinue models Important For your convenience log the following information 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 Depa...

Page 3: ...ARNING The dryer must never be operated with any of the back guards outer tops or service panels removed PERSONAL INJURY or FIRE COULD RESULT CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR THE DRYER S WARNING CHILDREN SHOULD BE SUPERVISED IF NEAR DRYER S IN OPERATION CAUTION LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION D...

Page 4: ...ER IN THE PRESENCE OF DRY CLEANING FUMES IMPORTANT PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment and or specified in the installation operator s manual included with the dryer Dryer s must not be installed or stored in an area where it will be exposed to water and or weather The wiring diagram for the dryer is located in the front electrical control box area ...

Page 5: ...f Parts 8 A Computer Panel Assembly 8 B Control Box 8 C DSI Module for Gas Models ONLY 8 D Gas Burner Assembly 9 E Drive Motor 9 F Blower Motor and Impellor for 60 Hz Gas Models ONLY 9 G Blower Motor and Impellor for 50 60 Hz Steam Models and 50 Hz Gas Models 9 H Idler Assembly 10 I Tumbler Bearing and Pulley Arrangement 10 J Basket Tumbler 10 K Main Door Switch 11 L Sail Switch for Gas Models ONL...

Page 6: ...ndicator is on but there is no heat 37 6 Dryer operates probe sparks but gas does not flow 38 7 Dryer operates probe sparks but there is no ignition even though gas is evident 38 8 Dryer operates but is taking too long to dry 38 9 Thermal overload for drive motor is tripping 39 10 Overload for impellor fan motor is tripping 39 11 Dryer is cycling on burner hi limit safety thermostat 39 12 Display ...

Page 7: ... 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 rubberlike materials Drying in a heated tumbler may damage plastic or rubber and also may be a fire hazard 5 A program should be established for the inspection and cleaning of lint in the burner area and exhaust duct work The frequency of...

Page 8: ...ts and sensors WARNING To avoid the hazard of electrical shock discontinue electrical supply to dryer 90 DAYS Remove lint from the motor air vents and surrounding area 90 DAYS Inspect and tighten ALL set screws i e pulleys idler bearings tumbler bearings IMPORTANT Lint accumulation will restrict internal motor air flow causing overheating and irreparable damage Motor failure due to lint accumulati...

Page 9: ... for the cleaning of appliances is recommended B Adjustments SUGGESTED INTERVAL FUNCTION 6 MONTHS Motor and drive beltsshould be examined Cracked or seriously frayed belts should be replaced Tighten loose belts when necessary and check belt alignment 6 MONTHS Complete operational check of controls and valves 6 MONTHS Complete operational check of ALL safety devices door switches sail switch burner...

Page 10: ...hausts it out of 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 The air supply must be given careful consideration to insur...

Page 11: ...of gas natural or L P indicated on the dryer data label If this information does not agree with the type of gas available contact the distributor who sold the dryer or contact the factory The gas input ratings shown on the dryer data label are for elevations up to 2 000 feet unless elevation require ments of over 2 000 feet were specified at the time the dryer order was placed with the factory The...

Page 12: ...m consists of a microprocessor based control module along with an ignitor flame probe assembly This control utilizes a high voltage synchronous spark ignitor and a rectified flame sensor probe signal to locally control ALL basic functions in the gas burner SECTION IV Description of Parts A Computer Panel Assembly The computer panel assembly on the AD 170 consists of a phase 5 computer board a keyp...

Page 13: ...nected to the shaft of the blower motor The blower motor is a 3 HP motor and operates on 208 to 460 volts 3Ø 50 60 Hz G Blower Motor and Impellor 50Hz 60Hz Steam 50Hz Gas The impellor on this design 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 air flow CFM D Gas Burner Assembly Gas hea...

Page 14: ... arrangement is located viewing from the rear of the dryer approximately at the upper center of the dryer The arrangement consists of a pulley and two 2 bearings which serve to drive adjust and support the basket J Basket Tumbler The basket consists of four 4 ribs and four 4 perforated panels along with front and back which are screwed together as an assembly The basket also consists of tie rods w...

Page 15: ...r airflow can be caused by improperly designed exhaust ducting where the duct run is too long or has too many sharp bends in it It can also be caused by a lack of make up air K Main Door Switch The main door switch is located in the main door hinge block When the main door opens the switch will also open preventing the dryer from operating The main door switch is a safety device and should never b...

Page 16: ...t off the burner The dryer will not heat up until the air temperature cools down At this time the thermostat will reset Basket and blower will run but dryer will not heat 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 c...

Page 17: ... for use by an untrained person 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 and serial numbers available CAUTION Observe ALL safety precautions displayed on the dryer or specified in this manual before and while making repairs Before considering repla...

Page 18: ...rol panel Remove the board by pulling the other two corners off the clinch studs 6 Install new computer by reversing this procedure 7 When replacing the computer the A and B factors must be reprogrammed see Computer Operator s Manual for details NOTE The A and B factors are printed on a label located on the rear of the control panel see illustration 8 Reestablish power to dryer To Replace Keyboard...

Page 19: ...3 Remove microprocessor sensor bracket assembly from dryer a Disconnect sensor bracket harness connector b Loosen the two 2 Phillips head screws securing bracket assembly to dryer and remove bracket from dryer NOTE DO NOT remove screws 4 Disassemble sensor probe from bracket assembly by removing the top push on fastener securing the probe from bracket Use a small screwdriver to slowly pry the fast...

Page 20: ...ews 4 Reverse procedure for installing new ignitor flame probe NOTE Before reestablishing power to dryer visually check the following see illustration A The flame electrode ignitor electrode and ground rod are all on the same line axis B There should be a 1 8 gap 1 32 between the ignitor electrode and ground rod C Do not wrap the red HV wire and the flame electrode wire together Improper operation...

Page 21: ...et 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 NEVER TEST FOR LEAKS WITH A FLAME To Replace Main Burner Orifices 1 Refer to To Replace Gas Valve and follow steps 1 through 6 2 Unscrew main burner orifices and replace NOTE Use extreme care when removing and replacing orifices These o...

Page 22: ...Column W C Pressure a Connect water column test gauge connection to gas valve pressure tap 1 8 NPT This pressure tap is located on the outlet manifold side of the valve b Start dryer With burner on the correct water column reading in inches would be Natural Gas 3 5 to 4 Inches Water Column L P Gas 10 5 to 11 Inches Water Column 2 To Adjust Water Column Pressure natural gas only L P gas must be reg...

Page 23: ...rew and the terminal connections 3 Replace the top cap assembly with the L P version 4 Unscrew main burner orifices and replace with L P orifices NOTE Use extreme care when removing and replacing orifices These orifices are made of brass and are easily damaged 5 Reverse the procedure for reinstalling valve assembly to the dryer WARNING Test ALL connections for leaks by brushing on a soapy water so...

Page 24: ...bes to the burner tube rest 4 Remove the screws securing the burner tube rest to the oven and remove this rest 5 Remove screws securing the sight hole disk and burner box cover plate to the oven and remove both of these pieces 6 Remove burner tubes by sliding them out 7 Replace by reversing procedure WARNING Test ALL connections for leaks by brushing on a soapy water solution NEVER TEST FOR LEAKS ...

Page 25: ...tat Gas Models Only This thermostat is an important safety device serving as an added protection against failure of the air flow sail switch to open in the event of motor failure or reduced airflow condition IMPORTANT Under no circumstances should heat circuit safety devices ever be disabled 1 Discontinue power to dryer 2 Disconnect wires from hi limit thermostat 3 Remove screw washer and nut secu...

Page 26: ...emove the screws 4 Remove bracket assembly by slightly sliding bracket towards the rear of the dryer and to the left 5 Disconnect sensor bracket harness connector and remove bracket assembly from dryer 6 Disconnect the two 2 orange wires from the thermostat 7 Disassemble thermostat from bracket assembly by removing the two 2 mounting screws washers and nuts 8 Reverse this procedure for installing ...

Page 27: ...d bend the actuator arm of the sail switch accordingly until proper operation is achieved To check proper open position of sail switch open main door manually depress main door switch and start dryer With the main door open and the dryer operating the sail switch should be open and the burner should not come on CAUTION DO NOT abort this switch by taping or screwing sail switch damper to burner PER...

Page 28: ... sealant off main door This area must be completely cleaned for correct bonding 4 Apply a narrow bead of silicone ADC P N 170730 all around main door area where glass will rest 5 Install glass onto door adhesive and slightly press glass in place IMPORTANT DO NOT press hard or silicone thickness between the glass and door will be reduced resulting in poor bonding 6 The door assembly should now be p...

Page 29: ...ently remove front panel assembly 8 Reverse this procedure for installing new front panel 9 Reestablish power to dryer To Replace Main Door Hinge Pad 1 Discontinue power to dryer 2 Follow procedure for removal of main door assembly 3 Follow procedure for removal of front panel assembly 4 Disassemble hinge pad from front panel by removing the Phillips head screws located on the back side of the fro...

Page 30: ...ANT 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 30ft lbs 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 Small Idler Pulley 1 Loosen V belts Rotate pulley and rol...

Page 31: ...and sheave as shown in figure B on previous page 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 Tighten cap screws progressively There should remain a gap between the sheave hub and the flange of the bushing IMPORTANT Tighten screws evenly...

Page 32: ...ich may cause it to crack G Basket Assembly Basket Alignment Vertical Up and Down Adjustment 1 Discontinue power to dryer 2 Remove background 3 Loosen the two 2 vertical holding bolts on the side at the top of the bearing box 1 on each side 4 Back off jam nuts on vertical adjustment bolts 5 Turn these bolts clockwise evenly to raise basket or counterclockwise evenly to lower basket 6 Rotate basket...

Page 33: ...eplace Tumbler Basket or Tumbler Basket Support 1 Discontinue power to dryer 2 Follow procedure for removal of main door assembly 3 Follow procedure for removal of front panel assembly 4 Remove backguard 5 Remove tumbler belts 6 Remove basket pulley 7 Remove 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 groo...

Page 34: ...8 10 Check basket vertical lateral alignment and adjust if necessary 11 Replace backguard 12 Reestablish power to dryer H Bearings Refer to illustrations in section F Pulleys To Replace Rear Tumbler Basket Support Pillow Block Bearing 1 Discontinue power to dryer 2 Remove backguard 3 Remove basket pulley 4 Loosen lateral adjustment jam nuts and bolts Refer to illustration in section G Basket Align...

Page 35: ...placing back guard check basket lateral vertical adjustment as well as belt adjustment and readjust if necessary 9 Reestablish power to dryer To Replace Front Idler Shaft Pillow Block Bearing Bearing nearest the back of the dryer 1 Discontinue power to dryer 2 Remove V belts from idler pulleys 3 Remove bolts holding each idler pillow block bearing to mount 4 Remove idler shaft with both bearings a...

Page 36: ...ension If too loose they will slip excessive wear on the bearings will result If the pulleys are not properly aligned excessive belt wear will result Proper belt tension will allow 1 2 displacement under normal thumb pressure at mid span of belt NOTE Belts must always be replaced in pairs matched sets V Belt Tension Adjustment Basket to Idler 1 Discontinue power to dryer 2 Back off jam nuts on idl...

Page 37: ...alignment is required loosen motor pulley and bushing and move motor pulley to proper position 7 Retighten motor mount bolts and jam nuts 8 Reestablish power to dryer To Replace V Belts 1 Loosen tension on V belts so that they can easily be rolled off pulleys 2 Replace V belts 3 Retighten V belts and adjust tension and alignment per previous instructions J Motors To Replace Drive Motor 1 Discontin...

Page 38: ...e Steam Models 50 60 Hz and 50 Hz Gas Models ONLY 1 Discontinue power to 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 ...

Page 39: ... 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 power to 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 four 4 screws holding the lint switch cover on 5 Remove lint...

Page 40: ...n untrained person in making repairs Only properly licensed technicians should service the equipment OBSERVE ALL SAFETY PRECAUTIONS DISPLAYED ON THE EQUIPMENT OR SPECIFIED IN THIS MANUAL WHILE MAKING REPAIRS Refer to section Electrical Troubleshooting for a detailed troubleshooting procedure for electrical components 1 No display on computer A Open circuit breaker switch or blown fuse B Tripped ov...

Page 41: ...tor and blower start computer display heat indicator is on but there is no heat A Lint coop automatic safety thermostat 225 degree has failed B Sail switch is out of adjustment has failed or sail switch damper is not closing due to back pressure created by a restriction in the exhaust system C Failed burner hi limit 330º for gas models 290º for electric models safety thermostat D Failed ignitor fl...

Page 42: ...as valve C Ignitor probe is out of adjustment readjust within gas flow D Lint accumulation in burner tubes 8 Dryer operates but is taking too long to dry A An inadequate exhaust duct work system B Restriction in exhaust system C Insufficient make up air D Poor housekeeping Dirty or clogged lint screen E Washing machine extractors are not performing properly F An exceptionally cold humid or low bar...

Page 43: ...oad for impellor fan motor is tripping A Either an exceptionally low or high voltage supply B Motor bearing failure C Motor vents are blocked with lint D Failed motor E Failed overload F Out of balance impellor fan G Insufficient make up air 11 Dryer is cycling on burner hi limit safety thermostat A Insufficient exhaust duct work size or restriction in exhaust system B Insufficient make up air C L...

Page 44: ...assembly connector 2 Connection at computer harness connector D Faulty microprocessor computer controller 13 Dryer does not start Display reads door A Main door is open B Lint drawer is open C Faulty main door or lint door switch D Open circuit in either main door or lint drawer switch harnesses E Faulty 24 V transformer 14 There is excessive vibration coming from the basket A Basket is out of adj...

Page 45: ...rned not necessarily the suspect component itself ELECTRICAL PARTS SHOULD ALWAYS BE CHECKED FOR FAILURE BEFORE BEING RETURNED TO THE FACTORY The information provided should not be misconstrued as a device for use by an untrained person in making repairs Only properly licensed technicians should service the equipment OBSERVE ALL SAFETY PRECAUTIONS DISPLAYED ON THE EQUIPMENT OR SPECIFIED IN THIS MAN...

Page 46: ...dition occurs check to see if this fuse has blown If it has DO NOT replace the entire Phase 5 OPL microprocessor controller replace the fuse and do so with a 1 8 amp Slo Blo fuse ONLY NOTE Once the Phase 5 OPL microprocessor controller 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 wo...

Page 47: ...s page as HEAT MTR blower motor FWD forward REV reversing and DOOR These LEDs indicate that the outputs of the Phase 5 OPL microprocessor controller or in the case of the door switch are functioning 1 HEAT Output LED Indicator If the dryer is started and there is no heat yet the microprocessor controller display heat circuit indicator dot is on but the heat output LED indicator is off then the fau...

Page 48: ...ller display Forward indicator dot is on but the FWD forward motor output LED is off the fault is the Phase 5 OPL microprocessor controller itself b If the drive basket tumbler motor is not operating and the FWD indicator is on then the problem fault is elsewhere i e external of the Phase 5 OPL microprocessor controller 4 REV Output LED Indicator If the dryer is started and the blower motor is ope...

Page 49: ... and or motor output LEDs are off and the dOOr input LED is on the fault is in the Phase 5 OPL microprocessor controller itself If the failure was elsewhere i e dryer s door switch circuit the LED display would read dOOr if a keyboard entry was attempted If the LED display indicators are on the door LED input and motor heat output LED s are on and the motor and or heat is not active on then the pr...

Page 50: ...e display to read just the cycle in progress or just the basket temperature or to flash back and forth from cycle in progress to basket temperature while the dryer cycle is in progress d Indicator Dots Located at the top of the display is a series of dots which indicate the various microprocessor controller output functions while a cycle is in progress Illus No 3 BLOWER MOTOR INDICATOR This indica...

Page 51: ...rogram is active this indicator dot will be on whenever the microprocessor controller is in the guard on time program LED Display Codes A Slope Factor AUtO Automatic Mode Patent No 4 827 627 ArEv Always Reverse b Heat Loss offset Factor bUZ Buzzer tone bUZ tinE Buz Time º CEL Degree in Celsius CL Cool Down Cycle in Progress COOL tinE Cool Down Time COOL tEnP Cool Down Temperature CY A Preprogramme...

Page 52: ... dSFL Dryer Sensor Circuit Failure F Fabric temperature º FAr Degree in Fahrenheit FILL No Cycle in Progress FLS Flash Display Active GdLY Anti Wrinkle Delay Time G on tInE Anti Wrinkle On Time Grd Anti Wrinkle Program Active Hot 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 Prog...

Page 53: ... Keyboard 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 Hot Indicates that the dryer has experienced an overheating condition To cancel the Hot default code press the Clear Stop key D Computer Logic and Wiring Diagram 1 Operator enters desired selection s ...

Page 54: ...right hand corner of the diagram It is a six 6 digit number followed by a letter to distinguish the revision dates see illustration The wiring diagrams used in Troubleshooting are specifically for dryers manufactured at the time of publishing Your particular model may vary slightly depending on the date of manufacturing and options available The correct wiring diagram and number is either taped to...

Page 55: ...r reverses but does not go forward blower motor runs A If computer dot First one on left does not come on replace computer B Check for voltage across the coil of the reversing contactor located in the rear panel box The contactor according to your diagram is marked CR2 also the markings on the coil are A1 and A2 If there is voltage replace the coil or complete contactor If there is no voltage chec...

Page 56: ...oss the two BS1 terminals on the arc suppressor board If there is voltage across the two BS1 terminals and no voltage across the coil of the reversing contactor A1 and A2 the problem is bad wire s or termination s between BS1 and the contactor coil D If there is no voltage between the two BS1 terminals on the arc suppressor board check for voltage across the two AS1 terminals on the board If there...

Page 57: ...pressor board C If there is no voltage across the two AS3 terminals problem is bad wire s or termination s between the two AS3 terminals and the computer board 15 pin connector no 5 or faulty computer 5 No Heat drive blower motors run display reads normal Gas Models A Check for voltage across terminal block nos 3 and 7 If no voltage is present problem is bad wire or broken terminal from terminal b...

Page 58: ...tween terminal block nos 4 and 7 and the Damper Solenoid If voltage is present problem is faulty Damper Solenoid 7 Door condition NOTE Make sure main door and lint drawer are closed Also if checking either switch the plunger must be depressed Check LED input light door on component side of the computer If light is on replace computer A Check voltage 24 VAC across terminal block nos 5 and 7 If volt...

Page 59: ...Replace the temperature sensor underneath the basket on a bracket the bullet shaped device B If it still reads DSFL unplug the 4 pin connector from the temperature sensor bracket Also unplug the microprocessor 15 pin connector from the computer board Where the white red striped wire is going into the connector take a continuity reading across the wire and that same wire from the 4 pin connector th...

Page 60: ...and high voltage rating Removing the cap reveals the wiring to the motor On each wire there is a number which corresponds to the numbers on the motor plate Depending on whether the dryer is operating on low voltage or high voltage the wiring should match the motor plate as follows The dots and lines represent connections see illustration For example On Low Voltage wire 14 is connected to wire 4 wi...

Page 61: ...cribes the size of the dryer and the type of heat gas or steam B Serial number The serial number allows ADC to gather information on your particular dryer C Manufacturing code number The manufacturing code number is a number issued by ADC which describes all possible options on your particular model D Type of heat Describes the type of heat gas natural or L P steam or electric E Heat input For gas...

Page 62: ...position so that readings can be taken at eye level C Using a Manometer 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 Readings should be taken at eye level B Correct readings should be NATURAL GAS 3 5 4 0 inches W C L P GAS 11 10 5 inches W C 6 If water column pressure is incorrect refer to TO...

Page 63: ...et Wrench 3 8 Socket Wrench 1 2 Socket or Open End Wrench 1 4 Open End Wrench 5 16 Socket or Open End Wrench 1 2 Socket Wrench 7 16 Socket or Open End Wrench 5 16 Nut Driver 12 Pipe Wrench 2 1 8 T Shaped or L Shaped Allen Wrench 3 16 T Shaped or L Shaped Allen Wrench Wire Cutters 1 2 Allen Wrench 3 8 Allen Wrench Channel Locks Manometer ADC P N 122804 MP Pin Extraction Tool ADC P N 122800 ...

Page 64: ...ADC450400 1 02 27 98 50 ...

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