MDG75PNH and MDG75MNV (1,000 CFM/Phase 7 with S.A.F.E.) Installation 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 This product embodies advanced concepts in engineering, design, and safety. If this product is properly maintained, it will provide many years of efficient, trouble free, and most importantly safe operation. ONLY qualified technicians should service this equipment. OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation manual included with the dryer.
IMPORTANT YOU MUST DISCONNECT AND LOCK OUT THE ELECTRIC SUPPLYAND 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: Au moment de lentretien des commandes, étiquetez tous les fils avant de les débrancher.
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.
Table of Contents SECTION I SAFETY PRECAUTIONS ........................................................................................ 3 SECTION II SPECIFICATIONS ..................................................................................................... 5 A. Specifications ............................................................................................................................. 5 B. Component Identification ......................................................................
SECTION VI DATA LABEL INFORMATION ............................................................................. 35 SECTION VII PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMPONENTS ........................................................................................................ 36 SECTION VIII MANUAL RESET BURNER HI-LIMIT INSTRUCTIONS ............................... 38 A. Phase 7........................................................................................................................
SECTION I SAFETY PRECAUTIONS WARNING: For your safety, the information in this manual must be followed to minimize the risk of fire or explosion or to prevent property damage, personal injury, or loss of life. WARNING: The dryer must never be operated with any of the back guards, outer tops, or service panels removed. PERSONAL INJURY OR FIRE COULD RESULT. 1. DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. 2.
WARNING: DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or similarly textured rubber materials. Drying in a heated basket (tumbler) may damage plastics or rubber and may be a fire hazard. 7. A program should be established for the inspection and cleaning of lint in the burner area, exhaust ductwork, and area around the back of the dryer. The frequency of inspection and cleaning can best be determined from experience at each location.
SECTION II SPECIFICATIONS A. SPECIFICATIONS Gas MAXIMUM C APAC ITY (D RY WEIGHT) BASKET (TUMBLER) D IAMETER BASKET (TUMBLER) D EPTH BASKET (TUMBLER) MOTOR D OOR OPENING (D IAMETER) BASKET (TUMBLER) VOLUME EXHAUST C ONNEC TION (D IAMETER) AIRFLOW D RYERS PER 20 /40 C ONTAINER D RYERS PER 48 /53 TRUC K S.A.F.E. WATER C ONNEC TION VOLTAGE AVAILABLE APPROX. WEIGHT (UNC RATED ) APPROX. WEIGHT (C RATED ) HEAT INPUT INLET PIPE C ONNEC TION 75 lbs 37 36 1 hp* 21-1/2 22.
Specifications Gas NOTE: 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.
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 Z223.1LATEST 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.
10. The dryer must be installed with provisions for adequate combustion and make-up air supply. CAUTION: This dryer produces combustible lint and must be exhausted to the outdoors. Every 6 months, inspect the exhaust ducting and remove any lint buildup. IMPORTANT: Dryer must be installed in a location/environment, which the ambient temperature remains between 40º F (4.44º C) and 130º F (54.44º C). B. UNPACKING/SETTING UP Remove protective shipping material (i.e.
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 dryers 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.
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. Ignition problems and sail switch fluttering problems may result, as well as premature motor failure from overheating.
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. The dryer must be installed with a proper exhaust duct connection to the outside.
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.). NOTE: When the exhaust ductwork passes through a wall, ceiling, or roof made of combustible materials, the opening must be 2-inches (5.08 cm) larger than the duct (all the way around). The duct must be centered within this opening.
IMPORTANT: For extended ductwork runs, the cross section area of the ductwork can only be increased to an extent. When the ductwork approaches the maximum limits noted in this manual, a professional heating, ventilating, and air- conditioning (HVAC) firm should be consulted for proper venting information. ALL ductwork should be smooth inside with no projections from sheet metal screws or other obstructions, which will collect lint.
3. Multiple (Common) Dryer Venting IMPORTANT: For extended ductwork runs, the cross section area of the ductwork can only be increased to an extent. When the ductwork approaches the maximum limits noted in this manual, a professional heating, ventilating, and air-conditioning (HVAC) firm should be consulted for proper venting information. ALL ductwork should be smooth inside with no projections from sheet metal screws or other obstructions, which will collect lint.
IMPORTANT VENTING REMINDERS 1. Ductwork size and installation should be done by a qualified professional. 2. The dryer must be exhausted to the outdoors. 3. Ductwork should be routed as short as possible to the outdoors with as few elbows as possible. 4. Avoid 90° turns, use 30° or 45° turns instead. 5. For single dryer venting, the size of the ductwork must be a minimum of 8-inches (20.32 cm) for short runs (refer to the illustration on page 15). For longer runs, the diameter must be increased. 6.
F. ELECTRICAL INFORMATION 1. Electrical Requirements ALL electrical connections must be made by a properly licensed and competent electrician. This is to ensure 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.
2. Electrical Service Specifications IMPORTANT: Figures shown are for non-reversing models only. For reversing models contact the factory. *$6 (/(&75,&$/ 6(59,&( 63(&,),&$7,216 3(5 '5<(5 ,03257$17 127(6 $ 9$& $1' 9$& $5( 127 7+( 6$0( :KHQ RUGHULQJ VSHFLI\ H[DFW YROWDJH :KHQ IXVHV DUH XVHG WKH\ PXVW EH GXDO HOHPHQW WLPH GHOD\ FXUUHQW OLPLWLQJ FODVV 5. RU 5.
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 Canada Standards: Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION. The ground connection may be to a proven earth ground at the location service panel.
FOR 110V APPLICATIONS FOR 208-240V APPLICATIONS A ground lug is provided in the rear electrical box to connect your service ground. b. 3-Phase (3ø) Wiring Connections/Hookup The electrical connections on ALL 3-phase (3ø) dryers are made into the rear service box located at the upper left area of the dryer. The electrical connections are made at the power distribution block located in the service box. The ground connection is made to the copper lug, also provided in this box.
G. GAS INFORMATION It is your responsibility to have ALL plumbing connections made by a qualified professional to ensure that the gas plumbing installation is adequate and conforms to 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, or in Canada, the Canadian Installation Codes CAN/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.
2. Technical Gas Data a. Gas Specifications 7<3( 2) *$6 1$785$/ LQFKHV : & PE LQFKHV : & PE LQFKHV : & PE LQFKHV : & PE 0DQLIROG 3UHVVXUH ,Q /LQH 3UHVVXUH /,48,' 3523$1( 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 ------------------- 3/4 N.P.T.
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.
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. NOTE: A water column test pressure of 3.5 inches (8.7 mb) for natural gas and 10.5 inches (26.1 mb) for liquid propane (L.P.
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. In the case of 208 VAC or 240 VAC, the supply voltage must match the electric service specifications of the data exactly. 3.
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. Turn on electric power to the dryer. 2. Refer to the Operating Instructions for starting your particular model dryer. a.
NOTE: To check for proper sail switch operation, open the main door and while holding main door switch plunger in, start dryer. Dryer should start but heat circuit should not be activated (on). If the heat system is activated, the sail switch is improperly adjusted and must be adjusted by bending the actuator arm of the sail switch toward the burner box. If the actuator arm is bent too far toward the burner box of the dryer, the dryer may not have heat when needed.
J. PREOPERATIONAL INSTRUCTIONS 1. To start the dryer: Microprocessor Controller (Computer) Dryers a. Light emitting diode (L.E.D.) display will read READY (meaning no cycle in progress). b. Press the letter on the keyboard (touch pad) corresponding to the cycle desired (i.e., key E) and the dryer will then start. c. L.E.D. display will now show Cycle In Progress and Cycle Status meaning that the dryer is in the drying cycle (dry mode for 30 minutes) and count downwards in minutes.
REVERSING TIMER SPIN/DWELL ADJUSTMENTS Timer models have an electronic reversing timer in the electrical service box, which is located in the upper left rear area of the dryer. Both the Dwell (stop) Time and the basket (tumbler) Spin Time are adjustable by mode selection switches located on the electronic timer (as noted in the illustration below).
SECTION IV SERVICE/PARTS INFORMATION A. SERVICE Service must be performed by a qualified trained technician,service agency, or gas supplier. If service is required, contact the Maytag dealer from whom the equipment was purchased. If the dealer cannot be contacted or is unknown, contact the Maytag Co. for a dealer in your area. NOTE: When contacting the Maytag Co., be sure to give them the correct model number and serial number so that your inquiry is handled in an expeditious manner. B.
SECTION V ROUTINE MAINTENANCE A. CLEANING A program and/or schedule should be established for periodic inspection, cleaning, and removal of lint from various areas of the dryer, as well as throughout the ductwork 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 Inspect and remove lint accumulation in customer furnished exhaust ductwork system and from dryers internal exhaust ducting. WARNING: THE ACCUMULATION OF LINT IN THE EXHAUST DUCTWORK CAN CREATE A POTENTIAL FIRE HAZARD. WARNING: DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATION AIR. WARNING: INSPECT AND REMOVE ANY LINT ACCUMULATION, WHICH CAN CAUSE THE BACK DRAFT DAMPER TO BIND OR STICK.
D. LINT DRAWER REMOVAL To remove the lint drawer from the dryer pull drawer out approximately halfway. Rotate/move lint drawer stop hinge (refer to the illustration below) downward and pull drawer out. IMPORTANT: After replacing the lint drawer back into the dryer, be sure to rotate/move hinge back to the upward stop position.
SECTION VI DATA LABEL INFORMATION When contacting the Maytag dealer, or the Maytag Co., certain information is required to ensure proper service/parts information. This information is on the data label affixed to the upper left side panel area behind the top control (access) door. When contacting Maytag Co., please have the model number and serial number available. 1. MODEL NUMBER Describes the size of the dryer and the type of heat (gas, electric, or steam). 2.
SECTION VII PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMPONENTS 1. 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-F. c. Verify that the applicable indicator lights on the back side of the microprocessor controller (computer) board are lit. (Refer to the illustration below.
2. For Models with Johnson Direct Spark Ignition (DSI) Controller (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. The DSI module will LOCK OUT if the gas burner flame is not sensed at the end of the trial for ignition period.
SECTION VIII MANUAL RESET BURNER HI-LIMIT INSTRUCTIONS A. PHASE 7 This dryer was manufactured with a manual reset burner hi-limit thermostat, which is monitored by the Phase 7 computer. If the burner hi-limit is open prior to the start of the drying cycle, the dryer will start momentarily and then shut down, the Phase 7 computer will display BURNER HIGH LIMIT FAULT with an audio indication.
SECTION IX SENSOR ACTIVATED FIRE EXTINGUISHING (S.A.F.E.) SYSTEM S.A.F.E. System In Action The exclusive Sensor Activated Fire Extinguishing (S.A.F.E.) System will extinguish fires that may start in the drying basket (tumbler). A series of sensors positioned throughout the basket (tumbler) and interfaced with the microprocessor controller (computer) will trigger the S.A.F.E. system water jet(s) to extinguish the flames quickly.
INSTALLATION 1. Requirements The S.A.F.E. system must be supplied with a minimum water pipe size of 1/2 and be provided with 40 psi +/- 20 psi (2.75 bar +/- 1.37 bar) of pressure. For use of optional manual bypass, a second source with the same piping and pressure requirements is required. Flexible 1/2 feeds must be provided to avoid damage to electric water solenoid valve by vibration. IMPORTANT: Flexible supply line/coupling must be used.
Typical Water Supply OPTIONAL MANUAL BYPASS Provisions are made in the dryer S.A.F.E. system for the installation of an optional manual bypass. Depending on the model dryer, the connections for the manual bypass are made at the T or four way fitting located in the outlet supply side of the water solenoid valve. The use and connections of this manual bypass are at the option or discretion of the owner.
WARNING: If the water in the supply line or water solenoid valve freezes, the S.A.F.E. system will be INOPERATIVE!! The manual ball cock shutoff valve must be located outside of the dryer at a distance from the dryer where it is easily accessible. 3. Electrical Requirements No independent external power source or supply connection is necessary. The 24 volt power to operate the S.A.F.E. system is accomplished internally in the dryer (from the dryer controls).
S.A.F.E. System Water Valve Check The operation of the water solenoid valve can be tested to ensure that the water supply system and valve are functional. Before attempting a system check, be sure that ALL water supply shutoff valves to the dryer are in the OPEN position; the dryer must be in the READY mode with no cycle loaded or in progress. 1. Press and hold the red STOP/CLEAR key (while in READY mode and no cycle is in progress). 2. Press and hold the A key. 3.
S.A.F.E. System Diagnostics Messages OPEN THERMISTOR PROBE This message indicates that the S.A.F.E. system thermistor probe either is not connected or is damaged. If this condition is detected, the Phase 7 non-coin control will immediately enter S.A.F.E. SYSTEM DISABLED mode. SHORTED THERMISTOR PROBE This message indicates that the S.A.F.E. system thermistor probe is damaged or the wiring is shorted. If this condition is detected, the Phase 7 non-coin control will immediately enter S.A.F.E.
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