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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.
Do not store or use gasoline or other flammable
vapor and liquids in the vicinity of this or any
other appliance.
WHAT DO YOU DO IF YOU SMELL GAS
* Do not try to light any appliance.
* Do not touch any electrical switch; do not use
any phone in your building.
* Clear the room, building or area of all
occupants.
* Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
* If you cannot reach your gas supplier, call the
fire department.
Installation and service must be performed by a
qualified installer, service agency or the gas
supplier.
122299MS/tcosta
MDG-75
(Direct Spark Ignition)
Installation Manual
For replacement parts, contact the distributor from which the dryer
AVERTISSEMENT: Assurez-vous de bien
suivre les instructions données dans cette
notice pour réduire au minimum le risque
d'incendie ou d'explosion ou pour éviter tout
dommage matériel, toute blessure ou la mort.
Ne pas entreposer ni utiliser d'essence ni
d'autres vapeurs ou liquides inflammables dans
le voisinage de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR
DE GAZ:
* Ne pas tenter d'allumer d'appareil.
* Ne touchez à aucun interrupteur. Ne pas
vous servir des téléphones se trouvant dans
le bâtiment où vous vous trouvez.
* Évacuez la pièce, le bâtiment ou la zone.
* Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions
du fournisseur.
* Si vous ne pouvez rejoindre le fournisseur
de gaz, appelez le service des incendies.
L'installation et l'entretien doivent être assurés
par un installateur ou un service d'entretien
qualifié ou par le fournisseur de gaz.
was purchased or
MAYTAG
403 West Fourth Street North
Newton, Iowa 50208
(515) 792-7000
Part No. 113123
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Related Manuals for Maytag MDG-75
Summary of Contents for Maytag MDG-75
- Page 1 Installation and service must be performed by a qualified installer, service agency or the gas supplier. 122299MS/tcosta MDG-75 (Direct Spark Ignition) AVERTISSEMENT: Assurez-vous de bien suivre les instructions données dans cette notice pour réduire au minimum le risque d’incendie ou d’explosion ou pour éviter tout...
- Page 2 403 West Fourth Street North Newton, Iowa 50208 (515) 792-7000 “IMPORTANT NOTE TO PURCHASER” POUR VOTRE SÉCURITÉ Ne pas entreposer ni utiliser d’essence ni d’autres vapeurs ou liquides inflammables dans le voisinage de cet appareil ou de yout autre appareil. MDG-75...
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Page 3: For Your Safety
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. - Page 4 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 manual included with the dryer.
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Page 5: Table Of Contents
Table of Contents SECTION I IMPORTANT INFORMATION ... 3 A. Receiving and Handling ... 3 B. Safety Precautions ... 4 SECTION II SPECIFICATIONS/COMPONENT IDENTIFICATION ... 6 A. Specifications ... 6 B. Component Identification ... 8 SECTION III INSTALLATION PROCEDURES ... 10 A. - Page 6 SECTION VI ROUTINE MAINTENANCE ... 36 A. Cleaning ... 36 B. Adjustments ... 37 C. Lubrication ... 37 SECTION VII PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMPONENTS ... 38 SECTION VIII REVERSING TIMER SPIN/DWELL ADJUSTMENTS ... 41 SECTION IX DATA LABEL INFORMATION... 42 A.
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Page 7: Important Information
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. -
Page 8: Safety Precautions
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. - Page 9 7. A program should be established for the inspection and cleaning of lint in the heating unit area, exhaust ductwork, 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 ductwork can create a potential fire hazard.
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Page 10: Specifications/Component Identification
SPECIFICATIONS/COMPONENT IDENTIFICATION A. SPECIFICATIONS MAXIMUM CAPACITY (DRY WEIGHT) BASKET (TUMBLER) DIAMETER BASKET (TUMBLER) DEPTH BASKET (TUMBLER) MOTOR DOOR OPENING (DIAMETER) BASKET (TUMBLER) VOLUME DRYERS PER 20'/40' CONTAINER DRYERS PER 45'/48' TRUCK VOLTAGE AVAILABLE APPROX. WEIGHT (UNCRATED) APPROX. WEIGHT (CRATED) HEAT INPUT AIRFLOW INLET PIPE SIZE** Shaded areas are stated in metric equivalents... -
Page 11: Specifications
Specifications MDG-75 (Direct Spark Ignition) * Duct size varies with installation conditions. NOTE: Manufacturer reserves the right to make changes in specifications at any time without notice or obligation. -
Page 12: Component Identification
B. COMPONENT IDENTIFICATION 1. Dryer Front View Illus. No. Description Controls Control (top access) Door Assembly Main Door Assembly Lint Compartment Area (lint screen located behind door) Data Label and Installation Label (located back side of the top front control/service door) - Page 13 2. Dryer Rear View Illus. No. Description Heating Unit Electric Service Relay Box Tumbler Bearing Mount Assembly Idler Bearing Mount Assembly Blower Motor Assembly Leveling Leg (rear) Basket (Drive) Motor Assembly (Reversing Models Only) Dryer Exhaust * Electric service connections for Gas Models are made in this box.
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Page 14: Installation Procedures
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) or ANSI/NFPA NO. 70-LATEST EDITION (National Electrical Code) or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [L.P.] Gas) or LATEST EDITION (for General Installation and Gas Plumbing) or Canadian Electrical Codes Parts 1 &... -
Page 15: Unpacking/Setting Up
To increase bearing life and improve efficiency, the dryer should be tilted slightly to the rear. The lint coops of ALL MDG-75 dryers are supported during shipping by a bracket. REMOVE THIS BRACKET BEFORE STARTING THE DRYER. -
Page 16: Dryer Enclosure Requirements
C. DRYER ENCLOSURE REQUIREMENTS Bulkheads and partitions should be made of noncombustible materials and must be located a minimum of 12- inches (30.48 cm), 18-inches (45.72 cm) or more is recommended for ease of installation, maintenance, and service) above the dryer outer top, except along the front of the dryer which may be partially closed in if desired. The clearance between the bulkhead header and the dryer must be a minimum of 4-inches (10.16 cm) and must not extend more than 4-inches (10.16 cm) to the rear of the front. -
Page 17: Fresh Air Supply Requirements
D. FRESH AIR SUPPLY REQUIREMENTS 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. -
Page 18: Exhaust Requirements
NOTE: Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY. E. EXHAUST REQUIREMENTS 1. General Exhaust Ductwork Information Exhaust ductwork should be designed and installed by a qualified professional. Improperly sized ductwork 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 basket (tumbler) hi-heat thermostats. - Page 19 IMPORTANT: Exhaust back pressure measured by a manometer in the exhaust duct must be no less than 0 and must not exceed 0.3 inches (0.74 mb) of water column (W.C.). IMPORTANT: Minimum ductwork diameter for horizontal venting is 10-inches (25.4 cm) and for vertical venting the minimum is 12-inches (30.48 cm).
- Page 20 IMPORTANT: Minimum duct size for a dryer that is vented vertically is 12-inches (30.48 cm) for a round duct or an equivalent of 120 square inches (774 square centimeters). THE DUCT SIZE MUST NOT BE REDUCED ANYWHERE DOWN STREAM OF THE DRYER. IMPORTANT: For extended ductwork runs, the cross section area of the ductwork can only be increased to an extent.
- Page 21 3. Multiple Dryer (Common) Venting If it is not feasible to provide separate exhaust ducts for each dryer, ducts from individual dryers may be channeled into a “common main duct.” The individual ducts should enter the bottom or side of the main duct at an angle not more than 45º...
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Page 23: Electrical Information
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 to local and state regulations or codes. In the absence of such codes, ALL electrical connections, materials, and workmanship must conform to the applicable requirements of the National Electrical Code ANSI/NFPA NO. - Page 24 WARNING: 208 VAC and 240 VAC ARE NOT THE SAME. Any damage done to dryer components due to improper voltage connections will automatically VOID THE WARRANTY. NOTE: The manufacturer reserves the right to make changes in specifications at any time without notice or obligation. MDG-75 (Gas) WIRE APPROX. MINIMUM AMP DRAW...
- Page 25 3. Grounding A ground (earth) connection must be provided and installed in accordance with state and local codes. In the absence of these codes, grounding must conform to applicable requirements of the National Electrical Code ANSI/NFPA NO. 70-LATEST EDITION, or in Canada, the installation must conform to applicable Canadian Standards: Canadian Electrical Codes Parts 1 &...
- Page 26 Actual electrical wire connections are made to the L1 and L2 terminals of the motor contactor located in the rear service box mentioned above. The ground connection is also made to the copper lug also provided in this box. Single-Phase (1Ø) Electrical Connections Leads Black White Green...
- Page 27 The only electrical input connections to the dryer are the 3-phase (3ø) power leads (L1, L2, L3, and sometimes neutral) and ground. Single-phase (1ø) power for the control circuit is done internally to the dryer. No single-phase (1ø) input connection is required on a 3-phase (3ø) dryer. For gas dryers manufactured for operation at 3-phase (3ø), the electrical connections are made at the power distribution block located in the service box at the rear, upper left corner of the dryer.
- Page 28 3) 3-Phase (3ø) Wiring Connections or Hookup (for Reversing Models Only) The electrical connections on ALL 3-phase (3ø) gas dryers are made into the rear service box located at the upper left area of the dryer. IMPORTANT: A separate circuit servicing each dryer must be provided. If local codes permit, power to a gas dryer can be made by the use of flexible U.L.
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Page 29: Gas Information
If this information does not agree with the type of gas available, DO NOT operate the dryer. Contact the distributor who sold the dryer or the MAYTAG Corporation. IMPORTANT: Any burner changes or conversions must be made by a qualified professional. - Page 30 MODEL kcal/hr Per Hour NUMBER Rating Rating MDG-75 200,000 50,400 Shaded area is stated in metric equivalent * Drill Material Size (D.M.S.) equivalents are as follows: Natural Gas ... #29 = 0.1360” (3.4544 mm). Liquid Propane Gas .. #47 = 0.0785” (1.9939 mm).
- Page 31 3. Piping/Connections ALL components/materials must conform to National Fuel Gas Code Specifications ANSI Z223.1-LATEST EDITION, or in Canada, CAN/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [L.P.] Gas) or LATEST EDITION (for General Installation and Gas Plumbing), as well as local codes and ordinances and must be done by a qualified professional.
- Page 32 Consistent gas pressure is essential at ALL gas connections. It is recommended that a 3/4-inch (19.05 mm) pipe gas loop be installed in the supply line servicing a bank of dryers. An in-line pressure regulator must be installed in the gas supply line (header) if the (natural) gas pressure exceeds 12.0 inches (29.9 mb) of water column (W.C.) pressure.
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Page 33: Preparation For Operation/Start-Up
H. 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 back side of the top front control/service door. -
Page 34: Preoperational Tests
I. 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. - Page 35 3. Make a complete operational check of ALL safety related circuits: a. Door Switch(es) b. Hi-Limit Thermostats c. Sail Switch - Gas Models NOTE: To check for proper sail switch operation (for Gas Models), open the main door and while holding main door switch plunger in, start dryer.
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Page 36: Preoperational Instructions
7. Reversing Models ONLY Basket (tumbler) dryer should never be operated with less than a 30 lb (14 kg) load (dry weight). The size of the load will affect the coast-down and dwell (stop) times. The basket (tumbler) must come to a complete stop before starting in opposite direction. -
Page 37: Shut Down Instructions
K. SHUT DOWN INSTRUCTIONS If the dryer is to be shut down (taken out of service) for a period of time, the following must be performed: 1. Discontinue power to the dryer either at the external disconnect switch or the circuit breaker. 2. -
Page 38: Service/Parts Information
B. PARTS 1. Replacement parts should be purchased from the MAYTAG distributor from whom the MAYTAG equipment was purchased. If the distributor cannot be contacted or is unknown, contact the MAYTAG for a distributor in your area. NOTE: When ordering replacement parts from the MAYTAG dealer be sure to give them the correct model and serial numbers so that your parts order can be processed in an expeditious manner. -
Page 39: Warranty Information
If a warranty card did not come with your dryer, contact the Manufacturer’s Warranty Department. 2. For specific warranty information on your dryer, contact the MAYTAG distributor who sold you the dryer or call the MAYTAG Co. at (515) 792-7000. -
Page 40: Routine Maintenance
Maximum operating efficiency is dependent upon proper air circulation. The accumulation of lint can restrict this airflow. If the guidelines in this section are met, your MAYTAG dryer will provide many years of efficient, trouble-free, and - most importantly - safe operation. -
Page 41: Adjustments
90 DAYS 1. Remove lint from around basket (tumbler), drive motors, and surrounding areas. 2. Remove lint from gas valve burner area with a dusting brush or vacuum cleaner attachment. 3. Clean any lint accumulation in and around both the blower and drive motors casing openings. NOTE: To prevent damage, avoid cleaning or touching ignitor and flame-probe assembly. -
Page 42: Procedure For Functional Check Of Replacement Components
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMPONENTS Microprocessor Controller (Computer) Board a. Upon completing installation of the replacement microprocessor controller (computer) board, reestablish power to the dryer. b. Start the drying cycle by pressing any of the preset cycles in letters “A thru F.” c. - Page 43 d. Verify that the motors heat and door indicator lights, on the back side of the microprocessor controller (computer) board are lit. (Refer to the illustration below.) e. Open the main door. The dryer must stop and ALL output indicator lights on the back side of the microprocessor controller (computer) board must go out.
- Page 44 2. For Models With Johnson Controls Direct Spark Ignition (DSI) 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 DSI module to keep the gas valve open...as long as there is a call for heat.
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Page 45: Reversing Timer Spin/Dwell Adjustments
REVERSING TIMER SPIN/DWELL ADJUSTMENTS Dual timer models with “reversing option” have an electric reversing timer in the electric service box, which is located in the upper 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). -
Page 46: Data Label Information
A. DATA LABEL Contact MAYTAG When contacting MAYTAG certain information is required to insure proper service and parts information from the manufacturer. This information is on the data label located on the back side of the top front control/service door. When contacting MAYTAG please have the model number and serial number available. - Page 47 The model number is a 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 Corporation to gather information on your particular dryer. 3. MANUFACTURING CODE NUMBER The manufacturing code number is a number issued by manufacturer, which describes ALL possible options on your particular model.
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Page 48: Troubleshooting
WARNING: 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. The information provided will help isolate the most probable component(s) associated with the difficulty described. - Page 49 b. Failed arc suppressor (A.S.) board (for Reversing Models ONLY). c. Failed drive motor. 2. Microprocessor controller (computer) motor indicator dot and relay output light emitting diode (L.E.D.) indicator dots are on, but motor output L.E.D. indicator is off... a. Failed microprocessor controller (computer). C.
- Page 50 1. Motor is overheating and tripping out on internal overload protector... a. Motor air vents clogged with lint. b. Low voltage to motor. c. Failed motor. d. Failed blower (impellor and fan)...is out of balance. G. Both drive motor and blower (impellor and fan) motor (Reversing Models ONLY) are not operating (does not start)...microprocessor controller (computer) motor indicator dots and relay output light emitting diode (L.E.D.) indicators are on...
- Page 51 K. Microprocessor controller (computer) L.E.D. display reads “door” and the microprocessor controller (computer) “DOOR” L.E.D. indicator is off... 1. Fault (open circuit) in main door/lint drawer switch circuit... a. Main door is not closed ALL the way. b. Main door switch is out of proper adjustment. c.
- Page 52 Q. Dryer stops during a cycle, microprocessor controller (computer) buzzer (tone) sounds for 5-seconds, and then the light emitting diode (L.E.D.) returns to “FILL”... 1. Loose connection somewhere in the main power circuit to the microprocessor controller (computer). R. Microprocessor controller (computer) L.E.D. display reads “SEFL”... 1.
- Page 53 2. Tripped burner manual reset hi-limit. 3. Tripped lint chamber sensor bracket basket (tumbler) manual reset hi-limit switch. U. Heating unit is not operating (no heat)...no voltage at heating unit (i.e., Gas Model) when dryer is first started and both the heat indicator dot and the “HEAT” output light emitting diode (L.E.D.) is not on...
- Page 54 2. Restriction in ductwork... a. Dryer back draft damper is sticking partially closed. b. Restriction/obstruction in ductwork... 1) Check ductwork from dryer ALL the way to the outdoors. 3. Insufficient make-up air. 4. Impellor (fan and blower) is rotating in the wrong direction (for 3-phase [3ø] Models ONLY). 5.
- Page 55 X. At the completion of the “AUTO” drying/cooling cycle, the load is coming out over dried... 1. Percent of dryness (dryness level) of the cycle selected is too high. 2. Factor “A” and Factor “B” is not set correctly or Factor “B” has to be adjusted for adverse local conditions.
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Page 56: Timer Models
2. Impellor (fan and blower) is out of balance... a. Excessive lint build up on impellor (fan and blower). b. Failed impellor (fan and blower). 3. Loose basket (tumbler) tie rod. 4. Failed basket (tumbler) support. 5. Loose motor mount. 6. - Page 57 3. Failed drive motor. C. Drive motor (Reversing Models ONLY) operates in one (1) direction only...stops and restarts in the same direction... 1. Failed reversing contactor (relay). 2. Failed reversing timer. D. Drive motor operates okay for a few minutes, then stops and will not restart... 1.
- Page 58 H. Heating unit is not operating (no heat)...no voltage at heating unit (i.e., Gas Model - Direct Spark Ignition [DSI] module) when dryer is first started... GAS MODELS... 1. Fault in sail switch circuit... a. Sail switch is out of adjustment or has failed. b.
- Page 59 c. Ignitor does not spark and module locks out (RED indicator stays on). 1) Fault in high voltage (HV) wire ... break or loose connection. 2) Failed ignitor probe assembly. 3) Failed direct spark ignition (DSI) module. Dryer operates but is taking too long to dry... 1.
- Page 60 4) Gas supply may have too low a heating value. NOTE: Lint accumulation on the sensor bracket can act as an insulator, which will affect the accuracy of the Automatic Drying Cycle. K. Main burners are burning with a yellow flame (for Gas Models ONLY)... 1.
- Page 61 3. Loose basket (tumbler) tie rod. 4. Basket (tumbler) is out of adjustment, or adjustment bolts (hardware) are loose. 5. Failed basket (tumbler) support. 6. Loose motor mount. 7. Failed idler, basket (tumbler), or blower drive bearings. 8. V-belts too tight or too loose. 9.
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Page 62: Burner And Basket (Tumbler)/Lint Chamber
BURNER and BASKET (TUMBLER)/LINT CHAMBER MANUAL RESET HI-LIMIT INSTRUCTIONS MANUAL RESET HI-LIMIT INSTRUCTIONS FOR DUAL TIMER OR PHASE 5 WITHOUT HEAT FAULT This dryer was manufactured with a manual reset burner hi-limit and basket (tumbler)/lint chamber thermostat. If either manual reset hi-limit 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. - Page 63 Part No. 113123 1- 12/30/99-25 2- 01/04/00-100 4- 06/08/00-200 5- 10/19/00-200 3- 02/05/00-200 6* 09/14/01-200...