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Maytag MDG75MNV - page 1
MDG75PNH and MDG75MNV (1,000 CFM/Phase 7 with S.A.F.E.) Installation Manual 122002JEV/mcronan Part No. 113394 RET AIN THESE INSTRUCTIONS IN A SAFE PLACE FOR FUTURE REFERENCE W ARNING: 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. ...
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Maytag MDG75MNV - page 2
Retain This Manual In A Safe Place For Futur e Refer ence 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. OBSER VE ALL SAFETY PRECA ...
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Maytag MDG75MNV - page 3
IMPOR T ANT YOU MUST DISCONNECT AND LOCK OUT THE ELECTRIC SUPPL Y AND THE GAS SUPPL Y BEFORE ANY COVERS OR GUARDS ARE REMOVED FROM THE MACHINE T O ALLOW ACCESS FOR CLEANING , ADJUSTING , INST ALLA TION, OR TESTING OF ANY EQUIPMENT PER OSHA (Occupational Safety and Health Administration) ST ANDARDS. W ARNING CHILDREN SHOULD NOT BE ALLOWED T O PLA Y ...
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Maytag MDG75MNV - page 4
W ARNING The dryer must never be operated with any of the back guards, outer tops, or service panels removed. PERSONAL INJUR Y OR FIRE COULD RESUL T . IMPOR T ANT PLEASE OBSER VE ALL SAFETY PRECAUTIONS displayed on the equipment and/or specified in the installation manual included with the dryer . W ARNING DR YER MUST NEVER BE OPERA TED WITHOUT THE ...
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Maytag MDG75MNV - page 5
Table of Contents SECTION I SAFETY PRECAUTIONS ........................................................................................ 3 SECTION II SPECIFICA TIONS ..................................................................................................... 5 A. Specifications ............................................................... ...
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Maytag MDG75MNV - page 6
SECTION VI DA T A LABEL INFORMA TION ............................................................................. 3 5 SECTION VII PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMPONENTS ........................................................................................................ 3 6 SECTION VIII MANUAL RESET BURNER HI-LIMIT INSTRUCTION ...
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Maytag MDG75MNV - page 7
3 SECTION I SAFETY PRECAUTIONS W ARNING: 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. W ARNING: The dryer must never be operated with any of the back guards, outer tops, or service panels removed. PERSONAL INJUR Y OR FIRE ...
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Maytag MDG75MNV - page 8
4 W ARNING: 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 arou ...
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Maytag MDG75MNV - page 9
5 SECTION II SPECIFICA TIONS A. SPECIFICA TIONS Shaded areas are stated in metric equivalents 2/5/04 * ALL reversing dryers are supplied with two (2) 3-phase (3ø) motors standard: a 1/2 hp (0.37 kW) blower motor and a 1/2 hp (0.37 kW) drive motor. * * Size of piping to dryer varies with installation conditions. Contact factory for assistance. NOTE ...
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Maytag MDG75MNV - page 10
6 NOTE: Manufacturer reserves the right to make changes in specifications at any time without notice or obligation. S pecifications Gas ...
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Maytag MDG75MNV - page 11
7 B. COMPONENT IDENTIFICA TION 1. Dryer Front V iew Illus. No. Description 1 Controls 2 Control (top access) Door Assembly 3 Main Door Assembly 4 Lint Compartment Area (lint screen located behind lint door or left sidewall) 5 Data Label and Installation Label ...
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Maytag MDG75MNV - page 12
8 2. Dryer Rear V iew Illus. No. Description 1 Heating Unit 2 Electric Service Relay Box 3 Basket (tumbler) Bearing Mount Assembly 4 Idler Bearing Mount Assembly 5 Blower Motor Assembly (for reversing models only) 6 Leveling Legs (rear) 7 Basket (tumbler) (drive) Motor Assembly 8 Dryer Exhaust ...
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Maytag MDG75MNV - page 13
9 SECTION III INST ALLA TION 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- LA TEST EDITION (National Fuel Gas Code) or AN SI/NFP A NO. 70-LA TEST EDITION (National Elec ...
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Maytag MDG75MNV - page 14
10 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. IMPOR T ANT : Dryer must be installed in a location/environment, which the ambient temperat ...
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Maytag MDG75MNV - page 15
11 C . D R YER 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 s outer top, except along the front of the dryer which may be partially cl ...
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Maytag MDG75MNV - page 16
12 D. FRESH AIR SUPPL Y 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 affecte ...
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Maytag MDG75MNV - page 17
13 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, ...
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Maytag MDG75MNV - page 18
14 IMPOR T ANT : 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 ar ...
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Maytag MDG75MNV - page 19
15 IMPOR T ANT : 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 (HV AC) firm should be consulted for proper venting information. ALL ductwork should be smooth inside ...
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Maytag MDG75MNV - page 20
16 3. Multiple (Common) Dryer V enting IMPOR T ANT : 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 (HV AC) firm should be consulted for proper venting information. A ...
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Maytag MDG75MNV - page 21
17 IMPOR T ANT 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. A void 90° turns, use 30° or 45° turns instead. 5. For single dryer venting, the size o ...
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Maytag MDG75MNV - page 22
18 F . ELECTRICAL INFORMA TION 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 ...
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Maytag MDG75MNV - page 23
19 2. Electrical Service Specifications IMPOR T ANT : Figures shown are for non-reversing models only . For reversing models contact the factory . * AWG Stranded Wire Type...size wire as per National Electrical Code or local codes. 2/9/04 * * 3-Wire is available. *$6 (/(&7 5 , &$/6( 5 9, &(6 3(&, ), &$7 , 2 1 6 3(5 ? ...
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Maytag MDG75MNV - page 24
20 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/NFP A NO. 70-LA TEST EDITION, or in Canada, the installation must conform to applicable Canada Standards: Canadian ...
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Maytag MDG75MNV - page 25
21 A ground lug is provided in the rear electrical box to connect your service ground. b. 3-Phase (3ø) W iring 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 ...
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Maytag MDG75MNV - page 26
22 G . GAS INFORMA TION 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 requireme ...
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Maytag MDG75MNV - page 27
23 2. T echnical Gas Data a . Gas Specifications b. Gas Connections Inlet connection ------------------- 3/4 N.P .T . Inlet supply size ------------------- 3/4 Diameter Pipe (minimum) Btu/hr input (per dryer) ---------- 175,000 (44,100 kcal/hr) 1 ) Natural Gas Regulation is controlled by the dryer s gas valve s internal regulator . Inc ...
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Maytag MDG75MNV - page 28
24 3. Piping Connections ALL components/materials must conform to National Fuel Gas Code Specifications A NSI Z223.1-LA TEST EDITION, or in Canada, CAN/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [L.P .] Gas) or LA TEST EDITION (for General Installation and Gas Plumbing), as well as local codes and ordinances and must be done ...
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Maytag MDG75MNV - page 29
25 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.) pre ...
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Maytag MDG75MNV - page 30
26 H. PREP ARA TION FOR OPERA TION/ST AR T -UP The following items should be checked before attempting to operate the dryer: 1. Read ALL CAUTION , W ARNING , 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 V AC ...
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Maytag MDG75MNV - page 31
27 I. PREOPERA TIONAL 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. T urn on electric power to the dryer . 2. Ref ...
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Maytag MDG75MNV - page 32
28 NOTE: T o 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 ...
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Maytag MDG75MNV - page 33
29 J. P REOPERA TIONAL INSTRUCTIONS 1. T o 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. displ ...
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Maytag MDG75MNV - page 34
30 REVERSING TIMER SPIN/DWELL ADJUSTMENTS T imer 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) T ime and the basket (tumbler) Spin T ime are adjustable by mode selection switches located on the electronic timer (as noted in the illustration ...
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Maytag MDG75MNV - page 35
31 SECTION IV SER VICE/P AR TS INFORMA TION A. SER VICE 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 b e contacted or is unknown, contact the Maytag Co. for a dealer in your area. NOTE: When ...
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Maytag MDG75MNV - page 36
32 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 ...
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Maytag MDG75MNV - page 37
33 90 DA YS Inspect and remove lint accumulation in customer furnished exhaust ductwork system and from dryer s internal exhaust ducting. W ARNING: THE ACCUMULA TION OF LINT IN THE EXHAUST DUCTWORK CAN CREA TE A POTENTIAL FIRE HAZARD. W ARNING: DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILA TION AIR. W ARNING: INSPECT AND REMOVE ANY LINT AC ...
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Maytag MDG75MNV - page 38
34 D. LINT DRA WER REMOV AL T o 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. IMPOR T ANT : After replacing the lint drawer back into the dryer , be sure to rotate/move hinge back to the upward stop position. ...
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Maytag MDG75MNV - page 39
35 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 a n d serial number available. 1. MODE ...
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Maytag MDG75MNV - page 40
36 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 . V erify that the a ...
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Maytag MDG75MNV - page 41
37 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 modul ...
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Maytag MDG75MNV - page 42
38 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 ? ...
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Maytag MDG75MNV - page 43
39 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 . The ...
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Maytag MDG75MNV - page 44
40 INST ALLA TION 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 damag ...
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Maytag MDG75MNV - page 45
41 OPTIONAL MANUAL BYP ASS 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 b ...
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Maytag MDG75MNV - page 46
42 W ARNING: If the water in the supply line or water solenoid valve freezes, the S.A.F .E. system will be INOPERA TIVE!! 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 necessar ...
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Maytag MDG75MNV - page 47
43 S.A.F .E. System W ater V alve 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 pr ...
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Maytag MDG75MNV - page 48
44 S.A.F .E. System Diagnostics Messages OPEN THERMIST OR 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 THERMIST OR PROBE This message indicates that the ...
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Maytag MDG75MNV - page 49
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