MD-170 Installation/Operator's Manual 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 death. AVERTISSEMENT: Assurez-vous de bien suivre les instructions données dans cette notice pour réduire au minimum le risque dincendie ou dexplosion ou pour éviter tout dommage matériel, toute blessure ou la mort.
Retain This Manual In A Safe Place For Future Reference Our 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 and operator's manual included with the dryer.
IMPORTANT YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS 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. «Attention: Lor des opérations dentretien des commandes étiqueter tous fils avant de les déconnecter.
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 and SCREEN IN PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED. IMPORTANT PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment and specified in the installation and operator's manual included with the dryer.
Table of Contents SECTION I IMPORTANT INFORMATION ............................................................................... 3 A. RECEIVING and HANDLING ................................................................................................... 3 B. SAFETY PRECAUTIONS ........................................................................................................ 4 SECTION II SUPER AD-30 SPECIFICATIONS .......................................................................... 6 A.
SECTION VII TROUBLESHOOTING ........................................................................................... 43 SECTION VIII REVERSING TIMER SPIN / DWELL ADJUSTMENTS .................................. 60 SECTION IX DATA LABEL LOCATION/INFORMATION ...................................................... 61 SECTION X PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMONENTS ..........................................................................................................
SECTION I IMPORTANT INFORMATION A. RECEIVING and HANDLING The dryer is shipped in a protective stretch wrap cover with protective cardboard corners and top cover (or optional box) as a means of preventing damage in transit. Upon delivery, the dryer and/or packaging, and wooden skid should be visually inspected for shipping damage. If any damage whatsoever is noticed, inspect further before delivering carrier leaves. Dryers damaged in shipment: 1.
B. 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.
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. The frequency of inspection and cleaning can best be determined from experience at each location. WARNING: The collection of lint in the burner area and exhaust duct work can create a potential fire hazard. 8. For personal safety, the dryer must be electrically grounded in accordance with local codes and/or the National Electrical Code ANSI/NFPA NO.
SECTION II SPECIFICATIONS / COMPONENT IDENTIFICATION A. SPECIFICATIONS (GAS and STEAM) Maximum Capacity (Dry Weight) 170 lbs. 77.1 kg Basket Diameter 51-1/2" 130.8 cm Basket Depth 42-1/2" 107.9 cm Basket Motor 1 HP .746 kw Blower Motor 7-1/2 HP 5.6 kw 31-3/8" 79.7 cm 51.2 cu. ft. 1.45 cu. m. Door Opening (Diameter) Basket Volume Dryers Per 20’/40’ Container 3/7 Dryers Per 45’ /48’ Truck 8/8 Voltage Available 550,000 btu/hr 138,600 kcal/hr Approx. Weight (Uncrated) 1,900 lbs.
Specifications MDG-170 (Gas) MDS-170 (Steam) NOTE: Operating height of steam dryer is 101-inches (256.54 centimeters). NOTE: The manufacturer reserves the right to make changes in specifications at any time, without notice or obligation.
B. COMPONENT IDENTIFICATION 1. Dryer Front View Illus. No.
2. Dryer Rear View Illus. No. 1 2 3 4 5* 6 7 8 9 10 11 Description Basket (Drive) Motor Assembly Blower Motor Mount Assembly Idler Bearing Mount Assembly Tumbler Bearing Mount Assembly Electric Service Relay Box Heating Unit Data Label and Installation Label 1/8" Compressed Air Supply Inlet (Behind Gusset) Side Access Opening Front Access Opening Impellor (fan/blower) Assembly * Electric service connections are made in this box.
SECTION III INSTALLATION PROCEDURES 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) and/or ANSI/NFPA NO. 70-LATEST EDITION (National Electric Code) A. LOCATION REQUIREMENTS Before installing the dryer, be sure the location conforms to local codes and ordinances.
B. UNPACKING/SETTING UP Remove protective shipping material (i.e., plastic wrap, and/or optional shipping box) from dryer. IMPORTANT: Dryer must be transported and handled in an upright position at all times. The dryer can be moved to its final location while still attached to the skid or with the skid removed. To unskid the dryer, locate and remove the four (4) lag bolts securing the base of the dryer to the wooden skid.
3. If more headroom is needed when moving dryer into position, the top console (module) may be removed. a. To Remove Top Console (Module) 1) Disconnect the ground wire (A) at the Rear Upper Left Hand Corner of Dryer. 2) Remove the eight (8) set of nuts and washers (B) holding the console (module) to base. 3) Disconnect the white plug connector (C) located on the top of the rear electric service/ relay box (provides power to the heat circuit). 4) Disconnect air connection from the 3-way micro valve.
C. DRYER ENCLOSURE REQUIREMENTS Even though a 12-inch clearance is acceptable, it is recommended that the rear of the dryer be positioned approximately two (2) feet from the nearest obstruction (i.e., wall) for ease of installation, maintenance, and service. Bulkheads and partitions should be made from noncombustible materials. The clearance between the bulkhead header and the dryer must be a minimum of 4-inches and must not extend more than 4-inches to the rear of the dryer front.
D. FRESH AIR SUPPLY When the dryer is operating, it draws in room air, heats it, passes this air through the basket (tumbler), and exhausts 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 may result, as well as premature motor failure from overheating.
E. EXHAUST REQUIREMENTS 1. General Exhaust Duct Work Information Exhaust duct work should be designed and installed by a qualified professional. Improperly sized duct work will create excessive back pressure which results in slow drying, increased use of energy, overheating of the dryer, and shutdown of the burner by the airflow (sail) switches, burner hi-limits, or tumbler (basket) hi-heat thermostats. CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
a. Outside Duct Work Protection 1) To protect the outside end of horizontal duct work from the weather, a 90° elbow bent downward should be installed where the exhaust exits the building. If the exhaust duct work travels vertically up through the roof, it should be protected from the weather by using a 180° turn to point the opening downward. In either case, allow at least twice the diameter of the duct between the duct opening and the nearest obstruction.
2. Single Dryer Venting Where possible, it is suggested to provide a separate exhaust duct for each dryer. The exhaust duct should be laid out in such a way that the duct work travels as directly as possible to the outdoors with as few turns as possible. It is suggested that the use of 90° turns in ducting be avoided; use 30° and/or 45° angles instead. The shape of the exhaust duct work is not critical so long as the minimum cross section area is provided.
IMPORTANT: For extended duct work runs, the cross section area of the duct can only be increased to an extent. Maximum proportional duct work runs cannot exceed twenty (20) feet more than the original limitations of twenty (20) feet with two (2) elbows. When the duct work approaches the maximum limits as noted in this manual, a professional heating venting air conditioning (HVAC) firm should be consulted for proper venting information.
The main duct may be any shape or cross-sectional area, so long as the minimum cross section area is provided. The illustrations on page 20 show the minimum cross section area for multiple dryer round or square venting. These figures must be increased 10 square inches when rectangular main ducting is used, and the ratio of duct width to depth should not be greater than 3-1/2 to 1.
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F. ELECTRICAL INFORMATION 1. Electrical 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 with local and state regulations or codes. In the absence of such codes, ALL electrical connections, material, and workmanship must conform to the applicable requirements of the National Electrical Code ANSI/NFPA NO.70-LATEST EDITION.
2. Electrical Service Specifications M DG-170 (Gas) M DS-170 (Steam) ELECTRICAL SERVICE SPECIFICATIONS (PER IMPORTANT: 208 VAC NOTE: AND DRYER) 230/240 VAC ARE NOT THE SAME. When ordering, specify exact voltage. A. Fuse ratings are dual-element, time-delay, current limiting, class RK1 or RK5 ONLY. B. Circuit breakers are thermal magnetic (industrial) type ONLY. For others, calculate/verify correct breaker size according to appliance amp draw rating and type of breaker used. C.
3. Electrical Connections NOTE: A wiring diagram is included with each dryer and is affixed to the rear upper right guard/panel of the dryer. The only electrical input connections to the dryer are the 3-phase (3ø) power leads (L1, L2, and L3), GROUND, and in the case of four (4) wire service, the neutral. These electrical connections are made at the terminal block located in the electric service/relay box at the rear, upper left hand corner of the dryer.
4. Grounding Grounding (earth) connections must be provided and installed in accordance with state and local codes. In the absence of the codes, grounding must conform to applicable requirements of the National Electrical Code ANSI/NFPA NO.70 LATEST EDITION. The ground connection may be to a proven earth ground at the location service panel. NOTE: A grounding connection (terminal lug) is provided in the dryer's electrical service/relay box at the rear, upper left hand corner of the dryer.
G. GAS INFORMATION It is your responsibility to have ALL plumbing connections made by a qualified professional to assure that the gas plumbing installation is adequate and conforms with local and state regulations or codes. In the absence of such codes, ALL plumbing connections, materials, and workmanship must conform to the applicable requirements of the National Fuel Gas Code ANSI Z223.1-LATEST EDITION.
2. Technical Gas Data a. Gas Specifications TYPE OF G AS NATURAL 3.5 inches W.C. 8.7 mb 10.5 inches W.C. 26.1 mb 6.0 - 12.0 inches W.C. 14.92 - 29.9 mb 10.5 inches W.C. 26.1 mb Manifold Pressure* Inline Pressure LIQUID PROPANE Shaded areas are stated in metric equivalents * Measured at outlet side of gas valve pressure tap when gas valve is on. b. Gas Connections: Inlet connection ---- 1-inch N.P.T. Inlet supply size ----- 1-inch N.P.T.
3. Piping/Connections ALL components/materials must conform to National Fuel Gas Code Specifications. It is important that gas pressure regulators meet applicable pressure requirements and that gas meters be rated for the total amount of ALL the appliance Btu's being supplied. The dryer is provided with a 1-1/2-inch N.P.T. inlet pipe connection extending out the back area of the burner box. The minimum pipe size connection (supply line) to the dryer is 1-1/2-inch N.P.T.
IMPORTANT: The dryer and its individual shut-off valve must be disconnected from the gas supply system during any pressure testing of that system at test pressures in excess of 1/2 psig (3.5 kPa). NOTE: The dryer must be isolated from the gas supply piping system by closing its individual manual shut-off valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).
H. STEAM INFORMATION It is your responsibility to have ALL steam plumbing connections made by a qualified professional to assure that the installation is adequate and conforms with local and state regulations or codes. IMPORTANT: Failure to comply with the requirements stipulated in this manual can result in component failure which will VOID THE WARRANTY.
a. The pressure of the condensate in the steam supply will cause water hammer and subsequent heat exchanger (steam coil) failure. The steam supply connection into the main supply line must be made within a minimum 12-inch riser. This will prevent any condensate from draining towards the dryer. b. The steam supply piping to the dryer must include a 12-inch rise along with a drip trap and check valve. This will prevent any condensate from entering the steam coil. c. Flexible hoses or couplings must be used.
4. Steam Damper Connections The MDS-170 steam dryer is manufactured with a pneumatic (piston) damper system which requires an external supply of compressed air. The air connection is made to the steam damper solenoid valve which is located at the rear of the top console. a. Air Requirements C OMPRESSED A IR SUPPLY A IR PRESSURE Normal 80 PSI 552 kPa Minimum Supply 70 PSI 483 kPa Maximum Supply 90 PSI 621 kPa Shaded areas are stated in metric equivalents b.
6. Steam Damper Piston (Flow Control) Operation Adjustment Although the damper operation was tested and adjusted prior to shipping at 80 psi, steam damper operation must be checked before the dryer is put into operation. Refer to the illustration above for correct steam damper operation. If damper air adjustment is necessary, locate flow control valve and make necessary adjustments as noted below.
I. PREPARATION FOR OPERATION/START-UP The following items should be checked before attempting to operate the dryer; 1. Read ALL "CAUTION," "WARNING," and "DIRECTION" labels attached to the dryer. 2. Check incoming supply voltage to be sure that it is the same as indicated on the dryer data label affixed to the left inside front side panel (refer to the illustration in Section IX of this manual). In case of 208 VAC or 230/240 VAC, the supply voltage must match the electric service exactly. 3.
J. PREOPERATIONAL TESTS ALL dryers are thoroughly tested and inspected before leaving the factory. However, a preoperational test should be performed before the dryer is publicly used. It is possible that adjustments have changed in transit or due to marginal location (installation) conditions. 1. Turn on electric power to the dryer. 2. Make sure the main door is closed and the lint drawer is securely in place. 3. System controls operational test -- to start the dryer ... a.
4. Check to insure that the tumbler (basket) starts in the clockwise (CW) direction. Additionally, check the direction of the blower motor impellor/fan (squirrel cage) to insure that it is operating in the correct direction (blower motor pulley should be turning in the counterclockwise [CCW] direction). If it is, the phasing is correct. If the phasing is incorrect, reverse two (2) leads at L1, L2, or L3 of the power supply connection made to the dryer.
7. A reversing tumbler (basket) dryer should never be operated with less than a 60 lb. (27 kg) load (dry weight). The size of the load will affect the coast-down and dwell (stop) times. The tumbler (basket) must come to a complete stop before starting in opposite direction. For microprocessor controller (computer) models, with the automatic (mode) cycle only, the Spin Time and Stop Time are not adjustable.
L. COMPRESSED AIR REQUIREMENTS The model MD-170 dryer requires an external supply of compressed air of 2.5 cfm at 80 PSI (552 kPa). For Steam Models, compressed air is necessary for the air operated steam damper. On both the Steam Model as well as the Gas Model, compressed air is necessary/required for blower air jet operation...to clean lint from the impellor/fan (squirrel cage). 1.
SECTION IV SERVICE/PARTS INFORMATION A. SERVICE 1. Service must be performed by a qualified trained technician, service agency, or gas supplier. If service is required, contact the distributor from whom the Maytag Company equipment was purchased. If the distributor cannot be contacted or is unknown, contact the Maytag Customer Service Department for a distributor in your area.
SECTION V WARRANTY INFORMATION A. RETURNING WARRANTY CARD(S) 1. Before any dryer leaves the manufacturer, a warranty card is placed on the back side of the main door glass. These warranty cards are intended to serve the customer where we record the individual installation date and warranty information to better serve you should you file a warranty claim. IMPORTANT: A separate warranty card must be completed and returned for each individual dryer.
SECTION VI ROUTINE MAINTENANCE A. CLEANING A program 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.
90 DAYS Re-grease the two (2) 1-3/8-inch bearings that support the impellor/fan shaft. Use Shell Alvania #3 grease or its equivalent. Impellor/fan shaft bearings should be lubricated. Check to make sure that the set screws on the impellor/fan shaft bearings are tight. Remove lint from around tumbler (basket), drive motors, and surrounding areas. Remove lint from gas valve burner area with a dusting brush or vacuum cleaner attachment.
B. ADJUSTMENTS 7 Days After Installation and Every 6 Months Thereafter Inspect bolts, nuts, screws (bearing set screws), non-permanent gas connections (unions, shut-off valves, orifices, and grounding connections). Motor and drive belts should be examined. Cracked or seriously frayed belts should be replaced. Tighten loose V-belts when necessary. Complete operational check of controls and valves.
SECTION VII 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.
continued from page 43 3. Failed drive motor. 4. Failed microprocessor controller (computer). C. Drive motor (reversing) operates in one direction only...stops and restarts in same direction... 1. Failed drive motor contactor (relay). 2. Failed arc suppressor (A.S.) board. 3. Failed microprocessor controller (computer). D. Drive motor operates okay for a few minutes, and then stops and will not restart... 1. Motor is overheating and tripping out on internal overload protector ... a.
G. Both drive motor and blower (impellor/fan) motor are not operating (do not start)...microprocessor controller (computer) motor indicator dots and relay output L.E.D. indicator dots are on... 1. Failed arc suppressor (A.S.) board. 2. Failed contactors (both blower and drive). 3. Failed motors (both blower and drive). H. Both drive motor and blower (impellor/fan) motor is not operating (do not start)... microprocessor (computer) motor indicator dots and "door" L.E.D. indicator are on but relay output L.E.
K. Microprocessor controller (computer) display reads "door" and microprocessor controller (computer) "door" L.E.D. indicator is off... 1. Fault (open circuit) in main door/lint drawer switch circuit ... a. Lint drawer is not closed ALL the way. b. Lint drawer switch out of proper adjustment. c. Failed lint drawer switch. d. Failed main door switch. e. Broken connection/wire in main door or lint drawer circuit. 2. Failed 24 VAC step down transformer or fault in wiring. L.
Q. Dryer stops during a cycle, microprocessor controller (computer) buzzer (tone) sounds for 5-seconds, and then the L.E.D. (light emitting diode) display returns to FILL"... 1. Loose connection somewhere in the main power circuit to the microprocessor controller (computer). 2. Failed arc suppressor (A.S.) board. R. Microprocessor controller (computer) L.E.D. (light emitting diode) display reads "SEFL"... 1. Rotational sensor circuit (option) failure...
continued from page 47 a) Failed impellor (fan/blower) "squirrel cage." b) Loose or failed impellor (fan/blower) assembly drive belts. c) Fault in impellor (fan/blower) motor circuit...refer to Item E and Item F on page 44 in this section. 2. Tripped burner manual reset hi-limit circuit. 3. Tripped lint chamber sensor bracket basket (tumbler) manual reset hi-limit switch. STEAM MODELS 1. Tripped lint chamber sensor bracket basket (tumbler) manual reset hi-limit switch. U.
continued from page 48 c. Ignitor does not spark and Direct Spark Ignition (DSI) module "LOCKS-OUT" ("red" L.E.D. [light emitting diode] indicator light stays on) ... 1) Fault in high voltage (HV) wire... a) Break in wire. b) Loose connection. c) Failed ignitor probe assembly. d) Failed Direct Spark Ignition (DSI) module. STEAM MODELS 1. No (external) compressed air (80 PSI [552 kPa] required) to steam damper solenoid. 2. Flow control valve is not adjusted correctly ... a. Too much restriction. 3.
continued from page 49 6. Inadequate air flow... a. Impellor (blower/fan) "squirrel cage" failure. b. Loose impellor (blower/fan) "squirrel cage" drive V-belts. 7. Gas Models a. Low and/or inconsistent gas pressure; Natural Gas pressure must be 3.5 inches of water column (8.7 millibars). Liquid Propane (L.P.) pressure must be 10.5 inches of water column (26.1 millibars). b. Poor air/gas mixture (too much gas or not enough air) at burner...yellow or poor flame pattern... 1) Not enough make-up air.
continued from page 50 f. Dirty steam coil ... 1) Fins clogged with lint. g. Steam damper system not functioning properly... 1) Damper is sticking closed. 2) Leak in pneumatic (air) system. 9. Extractors (washers) not performing properly. 10. Failed microprocessor (computer controlled models Only)...temperature calibration is inaccurate. 11. Failed microprocessor temperature sensor (computer controlled models Only) ...calibration is inaccurate. 12.
Z. Dryer or scraping noise at tumbler (basket) area... 1. Check for object caught in tumbler (basket)/wrapper area. 2. Tumbler (basket) is out of proper alignment ... a. Check both vertical alignment and lateral alignment. b. Check gap between front panel and tumbler (basket)...set screws may have come loose, and tumbler (basket) walked forward or back. 3. Loose tumbler (basket) tie rod. 4. Failed tumbler (basket) support. AA. Excessive noise and/or vibration... 1. Dryer is not leveled properly. 2.
continued from page 52 c. Failed lint drawer switch. d. Failed main door switch. e. Broken connection/wire in main door or lint drawer switch circuit. 4. Failed push to start relay. 5. Failed 24 VAC step down transformer (for models 380 volts or higher Only). B. Drive motor is not operating (does not start)... 1. Failed drive motor contactor (relay). 2. Failed drive motor. C. Drive motor (reversing) operates in one direction only...stops and restarts in same direction... 1.
continued from page 53 c. Failed motor. d. Failed blower (impellor/fan) drive shaft bearings. NOTE: V-belts to tight or bearings not lubricated often enough. G. Both drive motor and blower (impellor /fan) motor is not operating (do not start) and indicator light is on... 1. Fault in L1 or L2 termination(s) between terminal block and contactors (relays). 2. Failed contactors (both blower and drive). 3. Failed motors (both blower and drive) . H. Heating unit is not operating (no heat)...
STEAM MODELS 1. Tripped lint chamber sensor bracket tumbler (basket) manual reset hi-limit switch circuit. 2. Failed temperature selection switch or circuit. 3. Failed temperature cycle thermostat (try another selection). 4. Failed heat timer. I. No heat...voltage is confirmed at heating unit (i.e., Gas Model, DSI module, or Steam Model damper system pneumatic solenoid)... GAS MODELS 1. Fault in Direct Spark Ignition (DSI) ignition system ... a.
STEAM MODELS 1. No (external) compressed air (80 PSI [552 kPa) required) to steam damper solenoid. 2. Flow control valve is not adjusted correctly ... a. Too much restriction. 3. Failed steam damper pneumatic (air) solenoid. 4. Damper stuck in "closed" position ... a. Check for obstruction. 5. Leak in the pneumatic (air) system. 6. Failed air piston. J. Dryer operates but is taking too long to dry... 1. Exhaust duct work run too long or is undersized...back pressure cannot exceed 0.
continued from page 56 b. Poor air/gas mixture (too much gas or not enough air) at burner...yellow or poor flame pattern ... 1) Not enough make-up air. 2) Restriction in exhaust. 3) Gas pressure too high. 4) Impellor (blower/fan) "squirrel cage" rotating in the wrong direction. 5) Burner orifice size (D.M.S.) too large for application (i.e., high elevation). c. Sail switch is fluttering ... 1) Restriction in exhaust... a) Lint drawer screen is dirty or is not being cleaned often enough. d.
continued from page 58 10. Failed microprocessor controller (computer controlled models Only)...temperature calibration is inaccurate. 11. Failed microprocessor temperature sensor (computer controlled models Only)...calibration is inaccurate. 12. Exceptionally cold/humid or low barometric pressure atmosphere. 13. Microprocessor temperature sensor (computer controlled models Only) is covered with lint.
N. Excessive noise and/or vibration... 1. Dryer is not leveled properly. 2. Impellor (fan/blower) "squirrel cage" out of balance ... a. Excessive lint buildup impellor (fan/blower) "squirrel cage." NOTE: Check to insure that the air jet is functioning. b. Failed impellor (fan/blower) "squirrel cage." 3. Loose tumbler (basket) tie rod. 4. Failed tumbler (basket) tie rod. 5. Looses motor mount. 6. Failed idler, tumbler (basket), or fan (impellor) bearings. 7. V-belt(s) either too tight or too loose. 8.
SECTION VIII REVERSING TIMER SPIN/DWELL ADJUSTMENTS Timer models have an electric reversing timer in the electric service box which is located in the upper left rear area of the dryer. Both the Dwell (stop) Time and basket (tumbler) Spin Time are adjustable by mode selection switches located on the electronic timer (as noted in the illustration below).
SECTION IX DATA LABEL LOCATION / INFORMATION Data Label When contacting Maytag Company, certain information is required to insure proper service/parts information from Maytag. This information is on the data label that is located in the left inside front panel (as shown in the illustration above). When contacting the Maytag Company please have the model number and the serial number readily available.
THE DATA LABEL 1. MODEL DRYER The model number is a manufacturer's number which describes the size of the dryer and the type of heat (gas, electric, or steam). 2. SERIAL NUMBER The serial number allows Maytag Company to gather information on your particular dryer. 3. MANUFACTURING CODE NUMBER The manufacturing code number is a number issued by the manufacturer's which describes ALL possible options on your particular model. 4.
SECTION X PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMPONENTS 1. Microprocessor (computer) Board a. Upon completing installation of the replacement microprocessor (computer) board, reestablish power to the dryer. b. Start the drying cycle. c. Verify that the motor(s) and the heat indicator dots, in the microprocessor (computer) L.E.D.display are on. (Refer to the illustration below.) d.
e. Open main door. The dryer must stop and ALL output indicator lights on the back side of the microprocessor (computer) board must go out. f. Try to restart the dryer with the main door open. g.The microprocessor (computer) board's L.E.D. display must read "DOOR." h.Close the main door and restart the dryer. i. Functional check of microprocessor (computer) board is complete. 2. Direct Spark Ignition (DSI) System Models manufactured with ADC module Part No. 880815 a.
2. For models manufactured with Johnson Controls DSI (Direct Spark Ignition) Module (G760) Theory Of Operation; Start the drying cycle. When the gas burner ignites within the chosen trial for ignition time (6-seconds), the flame sensor detects gas burner flame and signals the Direct Spark Ignition (DSI) module to keep the gas valve open...as long as there is a call for heat. The DSI module will LOCKOUT if the gas burner flame is not sensed at the end of the trial for ignition period.
SECTION XI BURNER AND LINT (TUMBLER) CHAMBER MANUAL RESET HI-LIMIT INSTRUCTIONS IMPORTANT MANUAL RESET HI-LIMIT INSTRUCTIONS FOR DUAL TIMER OR PHASE 5 WITHOUT HEAT FAULT (GAS MODELS ONLY) This dryer was manufactured with a manual reset burner hi-limit and tumbler/lint chamber hi-limit thermostat.
IMPORTANT MANUAL RESET HI-LIMIT INSTRUCTIONS FOR DUAL TIMER OR PHASE 5 WITHOUT HEAT FAULT (STEAM MODELS ONLY) This dryer was manufactured with a manual reset tumbler/lint chamber hi-limit thermostat. If the manual reset thermostat is open prior to the start of the drying cycle, or during the cycle, the dryer will not recognize the open state of the hi-limit thermostat and will start or continue through the drying cycle with no heat. Manual reset hi-limit must be reset manually.
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