American Dryer Corp. ML-170 Service Manual

ADC Part No. 451102-1AD-115/120/170ML-120/130/145/170Service ManualPhase 7 Microprocessor ControlsAmerican Dryer Corporation88 Currant RoadFall River,

6SECTION IIIINSTALLATION REQUIREMENTSInstallation should be performed by competent technicians in accordance with local and state codes. In theabsenc

7B. ELECTRICAL AND GAS REQUIREMENTS1. Electrical RequirementsIt is your responsibility to have ALL electrical connections made by a properly licensed

8C. OPERATIONAL SERVICE CHECK PROCEDUREAfter performing any service or maintenance function, an operational check should be performed to insure thatA

9SECTION IVDESCRIPTION OF PARTSA. CONTROL PANEL (MICROPROCESSOR)Lifting the control door will reveal the control panelassembly. Opening the control

10D. LINT DRAWER SWITCHThe lint drawer switch is located in the lint compartmentand attached to the side of the lint drawer track. The lintdrawer sw

11G. BASKET (TUMBLER) BEARING AND PULLEY ARRANGEMENTThe basket (tumbler) bearing and the pulley arrangementis located (viewing from the rear of the d

12J. TEMPERATURE SENSOR (COMPUTER CONTROLS)The temperature sensor used, is a transducerthat converts heat into microamps that thecomputer board then

13M. COMPRESSED AIR REQUIREMENTSThis dryer requires an external supply of air (2.5 cfm @80 PSI [0.07 cmm @ 5.51 bar]) on the steam models, theair is

14P. MOTOR CONTACTOR (1Ø MOTOR)This motor contactor used on a single-phase (1ø) dryer, islocated in the rear of the dryer, in the electrical panelbox

15S. HI-LIMIT THERMOSTAT (GAS AND ELECTRIC MODELS ONLY)The hi-limit thermostat is another safety device that we use on gas and electric models. The

Retain This Manual In A Safe Place For Future ReferenceAmerican Dryer Corporation products embody advanced concepts in engineering, design, and safety

16SECTION VSERVICINGIMPORTANT: YOU MUST DISCONNECT AND LOCKOUT THE ELECTRIC SUPPLYAND THE GAS SUPPLY BEFORE ANY COVERS OR GUARDS ARE REMOVEDFROM THE M

17NOTE: Use caution when handling MP Controller. It can be easily damaged by static electricity.TO REPLACE COMPUTER1. Discontinue power to the dryer.

18TO REPLACE COMPUTER TEMPERATURE SENSOR PROBE1. Discontinue power to the dryer.2. Remove MP sensor bracket assembly from the dryer.a. Disconnect sens

19B. BURNER CONTROLS (GAS)This illustration is typical of ALL gas burners, but they are not ALL exactly alike. Your particular model mayhave some di

20TO REPLACE GAS VALVE1. Discontinue power to the dryer.2. Close shutoff valve in the gas supply line.3. Disconnect the gas valve wiring.4. Break unio

21NOTE: Manometers are available from the factory by ordering Part No. 122804.1. To test gas water column (W.C.) pressure.a. Connect water column test

22TO CONVERT FROM NATURAL TO LIQUID PROPANE (L.P.) GAS1. Disconnect electrical power to the dryer.2. Close ALL shutoff valves in dryer gas supply line

23TO REPLACE BURNER TUBES1. Discontinue power to the dryer.2. Close shutoff valve in the gas supply line.3. Disconnect the gas valve wiring.4. Break u

24C. STEAM CONTROLSINSTALLATIONPiping must be installed in accordance with good commercial steam system practice. Refer to the illustrationbelow for

25TO REPLACE STEAM COIL (DAMPER SYSTEM)1. Discontinue power to the dryer.2. Remove the four (4) lock washers and hex nuts securing the hinges to the s

IMPORTANTYOU MUST DISCONNECT AND LOCKOUT THE ELECTRICSUPPLY AND THE GAS SUPPLY OR THE STEAM SUPPLY BEFORE ANYCOVERS OR GUARDS ARE REMOVED FROM THE MAC

26TO REPLACE THE NEEDLE VALVE1. Discontinue power to the dryer.2. Discontinue the air to the dryer.3. Remove the 1/8” brass close nipple from the need

27D. ELECTRICAL OVEN CONTROLSTO REPLACE ELECTRICAL ELEMENTS1. Discontinue power to the dryer.2. Remove cover by removing screws and lifting the cover

28E. THERMOSTATS AND TEMPERATURE SENSORTO REPLACE HI-LIMIT THERMOSTAT (330º GAS, 290º ELECTRIC)This thermostat is an important safety device serving

29B. TEMPERATURE SENSOR (MICROPROCESSOR MODELS)1. Discontinue power to the dryer.2. Open and remove the lint door.3. Disconnect sensor bracket harness

30TO ADJUST SAIL SWITCH1. Operate the installed dryer normally to verify that the heat system is fully operational.2. Open the main dryer door.3. Manu

31TO REPLACE MAIN DOOR ASSEMBLY1. Remove screws holding main door to main door hinge.2. Reverse this procedure for reinstalling the new main door asse

325. Remove the screws securing the front panel to the dryer.6. Gently remove the top right hand corner of the front panel assembly from the dryer.7.

33H. BASKET (TUMBLER) AND BEARING ASSEMBLY(Remove back guard to access assembly)TO REPLACE BASKET (TUMBLER) PULLEY (Non-Reversing)1. Loosen V-belts,

34TO REPLACE THE REAR BASKET (TUMBLER) BEARING1. Remove the basket (tumbler) pulley (follow basket [tumbler] pulley removal procedure).2. Remove the f

35I. IDLER AND BEARING ASSEMBLY(Remove back guard to access assembly)TO REPLACE IDLER PULLEY1. Remove the back guard.2. Loosen V-belts, then rotate p

IMPORTANTPLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on theequipment and specified in the installation manual included with the dryer.WARNINGDRYER

36J. DRIVE PULLEY(Remove back guard to access assembly)1. Remove the back guard.2. Loosen V-belts then rotate pulley and roll V-belts outof the groov

378. Tighten the four (4) hex head bolts on the sides of thebearing box, and the two (2) Allen head adjustment screws.9. Replace the back guard.10. Re

38TO REPLACE THE BASKET (TUMBLER) AND/OR BASKET (TUMBLER) SUPPORT1. Discontinue power to the dryer.2. Remove the basket (tumbler) pulley.3. Remove the

39L. V-BELTS (REFER TO ILLUSTRATION IN SECTIONS I, J, AND K)V-belts should have proper tension. If too loose, they will slip, if too tight excessive

40TO REPLACE V-BELTS1. Loosen tension on V-belts, so that they can easily be rolled off pulleys.2. Replace V-belts.3. Retighten V-belts and adjust ten

41O. LINT DRAWER SCREENTO REPLACE LINT SCREEN1. Gently slide the lint drawer outward.2. Remove the lint bag and inspect for rips or tears.Replace wit

42SECTION VITROUBLESHOOTINGThe information provided will help isolate the most probable components associated with the difficulty described.The experi

43PHASE 7 OPL SYSTEM DIAGNOSTICSIMPORTANT: YOU MUST DISCONNECT AND LOCKOUT THE ELECTRIC SUPPLYAND THE GAS SUPPLY OR THE STEAM SUPPLY BEFORE ANY COVERS

44BURNER PURGE FAULT – The gas valve signal is present during the prepurge time.MODEL ERROR, ENTER CORRECT MODEL – The wrong model was selected for th

452. OUTPUTS9. AUX – (GREEN L.E.D.) This is for a spare output to be programmed.10. STEAM – (GREEN L.E.D.) This light emitting diode (L.E.D.) will ind

Table Of ContentsSECTION IIMPORTANT INFORMATION ... 3A. Safety Precautions

46A. The display reads “Exhaust High Limit Fault.” (Refer to page 50)The temperature in the basket (tumbler) is above 220º F (104º C) or follow Steps

47E. The display reads “Sail Switch Closed Fault.” (Refer to page 51)1. Prior to start up, the sail switch is in the closed position.2. Check the sai

48H. Drive motor reverses, but does not go forward, blower motor runs. The display reads “RotationFault.”* (Refer to page 56)1. Possible causes:a. B

49J. No display condition or display reads “Low Voltage Fault.”* (Refer to page 53)1. Check for line voltage (120, 208, 240, etc.) in the rear of the

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SECTION VSERVICING ...16A. Controls (Comput

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57SECTION VIIDATA LABEL INFORMATIONA. DATA LABELContact MaytagWhen contacting Maytag, certain information is required to insure proper service/parts

58THE DATA LABEL1. MODEL NUMBERThe model number is an Maytag Company number, which describes the size of thedryer and the type of heat (gas, electric,

59B. USING A MANOMETERHOW TO USE A MANOMETER1. With dryer in nonoperating mode, remove plugon the gas valve pressure tap.2. Install 1/8” N.P.T. fitti

60C. KEYBOARD (TOUCHPAD) LAYOUT1. Dot Matrix Display2. A-F Preprogrammed Cycles3. Stop/Pause Button4. Start Button5. Increment Button6. Decrement But

61D. SENSOR ACTIVATED FIRE EXTINGUISHING (S.A.F.E.) SYSTEM THEORY OF OPERATIONWhile the dryer is in an idle state or 20-seconds after the heat tu

62E. STATIC PRESSUREThe pressure of the air in sheet metal ducts is of great importance for safe and efficient operation of the dryer.The air pressur

63F. USING A MAGNEHELICWhen measuring such small air pressures, the U-tube is often not accurate enough. Such small differences inpressure are most

64To obtain the most accurate static pressure readings of a dryer, the following guidelines should be conformedto. The reading should be taken in a s

65Notes ______________________________________________________________________________________________________________________________________________

3SECTION IIMPORTANT INFORMATIONA. SAFETY PRECAUTIONS1. DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or

ADC Part No. 451102 1 - 03/28/07 - 0

4SECTION IIROUTINE MAINTENANCEA. CLEANINGA program and/or schedule should be established for periodic inspection, cleaning, and removal of lint fromv

56 MONTHSInspect and remove lint accumulation in the customer furnished exhaust ductwork system. Inspect exhaustdraft dampers to insure they are not