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Part No. 113065 MDG-75 Installation/Operator's Manual For replacement parts, contact the distributor from which the dryer was purchased or MA YT AG 403 W est Fourth Street North Newton, Iowa 5020.
Retain This Manual In A Safe Place For Future Reference For replacement parts, contact the distributor from which the dryer was purchased or contact: MA YT AG 403 W est Fourth Street North Newton, Iowa 50208 (515) 792-7000 The illustrations on the following pages may not depict your particular dryer exactly .
IMPOR T ANT YOU MUST DISCONNECT and LOCKOUT 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 Adminis- tration) ST ANDARDS.
W ARNING The dryer must never be operated with any of the back guards, outer tops, or service panels r emoved. 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/operator's manual included with the dryer .
Table of Contents SECTION I IMPOR T ANT INFORMA TION ............................................................................... 3 A. Receiving and Handling ..........................................................................................
SECTION V I ROUTINE MAINTENANCE .................................................................................. 3 5 A. Cleaning ........................................................................................................................
3 SECTION I IMPOR T ANT INFORMA TION 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.
4 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.
5 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.
6 SECTION II SPECIFICATIONS/COMPONENT IDENTIFICATION A. SPECIFICATIONS * For non-reversing models. ** A minimum of 3/4" pipe must be supplied to the gas inlet for each dryer. NOTE : Manufacturer reserves the right to make changes in specifications at any time, without notice or obligation.
7 Specifications MDG-75 (Hot Surface Ignition) NOTE : Manufacturer reserves the right to make changes in specifications at any time, without notice or obligation.
8 B. COMPONENT IDENTIFICATION 1. Dryer Front View Illus. No. Description 1 Controls 2 Control (top access) Door Assembly 3 Main Door Assembly 4 Lint Compartment Area (lint screen located behind door) .
9 2. Dryer Rear V iew Illus. No. Description 1 Heating Unit 2 * Electric Service Relay Box 3 T umbler Bearing Mount Assembly 4 Idler Bearing Mount Assembly 5 Blower Motor Assembly 6 Leveling Leg (rear) 7 Basket (Drive) Motor Assembly (Reversing Models Only) 8 Dryer Exhaust * Electric service connections for Gas Models are made in this box.
10 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: National Fuel Gas Code ANSI.
11 B. UNP ACKING/SETTING UP Remove protective shipping material (i.e., plastic wrap, or optional shipping box) from dryer . IMPOR T ANT : 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.
12 C. DRYER ENCLOSURE REQUIREMENTS Bulkheads and partitions should be made of noncombustible materials and must be located a minimum of 12-inches (18-inches 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.
13 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.
14 E. EXHAUST REQUIREMENTS 1. General Exhaust Duct W ork Information Exhaust duct work should be designed and installed by a qualified professional. Improperly sized duct work will create excessive ba.
15 NOTE : Where the exhaust duct work passes through a wall, ceiling, or roof made of combustible materials, the opening must be 2-inches larger (all the way around) than the duct.
16 IMPORTANT : For extended duct work runs, the cross section area of the duct work can only be increased to an extent. When the duct work approaches the maximum limits noted in this manual, a professional heating venting air conditioning (HVAC) firm should be consulted for proper venting information.
17.
18 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.
19 2. Electrical Service Specifications a . Gas ONL Y IMPORTANT : Figures shown are for Non-Reversing Models ONLY. For reversing models contact the factory. IMPORTANT : The dryer must be connected to the electric supply shown on the data label that is af fixed to the back side of the upper or top control door .
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 Electric Code ANSI/NF P A NO. 70- LA TEST EDITION.
21 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. If local codes permit, power to the dryer can be made by the use of a flexible U.
22 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.
23 3) 3-Phase (3ø) W iring Connections or Hookup (for Reversing Models Only) The electrical connections on ALL 3-phase (3ø) gas dryers dryers are made into the rear service box located at the upper left area of the dryer . IMPOR T ANT : A separate circuit serving each dryer must be provided.
24 G . GAS INFORMA TION 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.
25 2. T echnical Gas Data a . Gas Specifications b. Gas Connections: Inlet connection ------------ 3/4-inch N.P .T . Inlet supply size ------------ 3/4-inch N.P .T . (minimum) Btu/hr input (per dryer) --- 200,000 1) Natural Gas Regulation is controlled by the dryer's gas valve's internal regulator .
26 3. Piping/Connections ALL components/materials must conform to National 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.
27 Consistent gas pressure is essential at ALL gas connections. It is recommended that a 3/4-inch pipe gas loop be installed in the supply line serving 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.
28 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 .
29 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.
30 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 : T o check for proper sail switch operation ( for Gas Models ), open the main door and while holding main door switch plunger in, start dryer .
31 7. Reversing Models ONL Y Basket (tumbler) dryer should never be operated with less than a 30 lb. 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.
32 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. Discontinue the heat supply: a.
33 SECTION IV SER VICE/P AR TS INFORMA TION A. SER VICE 1. Service must be performed by a qualified trained technician, service agency , or gas supplier .
34 SECTION V W ARRANTY INFORMA TION A. RETURNING W ARRANTY CARD(S) 1 . Before any dryer leaves the factory test area, a warranty card (Part No. 1 12252) is placed on the back side of the main door glass.
35 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 deter - mined from experience at each location.
36 90 DA YS 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 motor casing openings.
37 B. ADJUSTMENTS 7 DA YS AFTER INST ALLA TION 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.
38 SECTION VII 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 by pressing any of the preset cycle in letters "A thru F".
39 d. V erify that the motors heat, and door indicator lights on the back side of the microprocessor (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 (computer) board must go out .
40 d. The hot surface ignitor will turn on. After approximately 4 seconds the Glo Bar will shut off and the gas valve will be energized. The flame should now be established. e . With the burner flame on, remove the flame sensor wire from the S2 terminal of the HSI module.
41 SECTION VIII REVERSING TIMER SPIN AND 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 .
42 When contacting MA YT AG certain information is required to insure proper service and parts information from the manufacturer . This information is on the data label located on the inside of the control door . When contacting MA YT AG please have the model number and serial number available.
43 THE DA T A LABEL 1. MODEL DR YER The model number is a number which describes the size of the dryer and the type of heat (gas or electric). 2. SERIAL NUMBER The serial number allows Maytag Corporation and the manufacturer to gather in- formation on your particular dryer .
44 SECTION X TROUBLESHOOTING W ARNING : YOU MUST DISCONNECT and LOCKOUT 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 O F ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) ST ANDARDS.
45 0 ,&5 235 2&(6625 &2 0387( 5 0 2'( / 6 &2 17, 18(' , 3 0 & : 1 $ $ . ( .
46 MICROPROCESSOR (C OMPUTER ) MODELS A . No L.E.D. (light emitting diode) display (for micr oprocessor [computer] models ONL Y)... 1. Service panel fuse blown or tripped breaker . 2. Blown control circuit L1 or L2 1/2-amp (Slo Blo) fuse. 3. Failed microprocessor controller (computer).
47 E . Blower and Fan motor is not operating ( does not start)... 1. Microprocesssor controller (computer) motor indicator dot and relay output L.E.D. (light emitting diode) indicator dots are on ... a . Failed blower (impellor and fan) motor contactor (relay).
48 b. Loose connection in main door switch circuit. J . Microprocessor (computer) L.E.D. (light emitting diode) display reads "dSFL" continuously and the buzzer (tone) sounds every 30 seconds... 1. Fault in microprocessor heat sensing circuit.
49 O . Microprocessor controller (computer) locks up and L.E.D. (light emitting diode) display reads erroneous message(s) or only partial segments... 1. T ransient power voltage spikes...disconnect the electrical power to the dryer , wait one (1) minute and reestablish power to the dryer .
50 T . Heating unit is not operating ( no heat)...no voltage at heating unit (i.e., Gas Model - HSI module, Electric Model - electric oven contactor when dryer is first started and both the heat indicator dot and the "HEA T" output L.E.D. (light emitting diode) is on .
51 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 "HEA T" output L.E.D. (light emitting diode) is not on ... 1. Failed microprocessor controller (computer).
52 W . Dryer operates but is taking too long to dry ... 1. Exhaust duct work run is too long or is undersized...back pressure cannot exceed 0.3 inches water column (W .C.). 2. Restriction in duct work ... a . Dryer back draft damper is sticking partially closed.
53 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.
54 Z. Main burners ar e burning with a yellow flame (for Gas Models ONL Y) ... 1. Poor air and gas mixture (too much gas or not enough air) at the burner ... a. Not enough make-up air. b. Restriction in the exhaust. c. Gas pressure is too high. d. Impellor (fan and blower) is rotating in the wrong direction only (for 3ø Models ONLY) .
55 7. V-belts too tight or too loose. 8. Tumbler bearing set screws are loose. 9. Failed motor bearing. TIMER MODELS A . Dryer will not start...both drive motor and blower (impellor/fan) motor are not operating and indicator light is off ... 1. Service panel fuse blown or tripped breaker.
56 D . Drive motor operates okay for a few minutes, then stops and will not restart... 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. T umbler (basket) is binding.
57 b. Sail switch damper is not closing or is fluttering. 1) Lint screen is dirty . 2) Restriction in the exhaust. 3) No exhaust air flow ... a ) Failed impellor (fan and blower). b) Fault in blower (impellor and fan) motor circuit (for Reversing Models ONLY) .
J. D ryer operates but is taking too long to dry ... 1. Exhaust duct work run is too long or is undersized... back pressure cannot exceed 0.3 inches water column (W .C.). 2. Restriction in duct work ... a. Dryer back draft damper is sticking partially closed.
3) Sail switch is fluttering ... a) Lint screen is dirty or is not being cleaned often enough. b) Restriction in the exhaust. 4) Failed burner hi-limit.
K . Main burners are burning with a yellow flame (for Gas Models ONL Y) ... 1. Poor air and gas mixture (too much gas or not enough air) at the burner ... a . Not enough make-up air . b. Restriction in the exhaust. c . Gas pressure is too high. d. Impellor (fan and blower) is rotating in the wrong direction only (for 3ø Models ONLY) .
3. Loose basket (tumbler) tie rod. 4. Basket (tumbler) 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.
Part No. 113065 1- 11/ 30/ 98- 75 2*01/07/998-50.
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