Maytag MDG52 Service Manual Download Page 1

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Part No. 450362 - 1

MDG-52 / MDG-78

Service Manual

Whirlpool Corporation

Commercial Laundry

Benton Harbor, MI 49022

1-800-662-3587

Summary of Contents for MDG52

Page 1: ...Part No 450362 1 MDG 52 MDG 78 Service Manual Whirlpool Corporation Commercial Laundry Benton Harbor MI 49022 1 800 662 3587 ...

Page 2: ...structions to be followed if the user smells gas These instructions must be posted in a prominent location near the dryer We have tried to make this manual as complete as possible and hope you will find it useful The manufacturer reserves the right to make changes from time to time without notice or obligation in prices specifications colors and material and to change or discontinue models The ill...

Page 3: ...dren should not be allowed to play on or near the dryers Children should be supervised if near dryer s in operation The dryer must never be operated with any of the back guards outer tops or service panels removed Personal injury or fire could result The dryer must never be operated without the lint filter or screen in place even if an external lint collection system is used The wiring diagram for...

Page 4: ... s must be exhausted to the outdoors 6 Although the manufacturer produces a very versatile dryer there are some articles that due to fabric composition or cleaning method should not be dried in it WARNING Dry only water washed fabrics Do not dry articles spotted or washed in dry cleaning solvents a combustible detergent or all purpose cleaner EXPLOSION COULD RESULT Do not dry rags or articles coat...

Page 5: ...n create a fire hazard 12 Do not operate steam dryers with more than 125 PSI 8 61 bars steam pressure Excessive steam pressure can damage steam coil and or harm personnel 13 Replace leaking flexible hoses or other steam fixtures immediately Do not operate the dryer with leaking flexible hoses PERSONAL INJURY MAY RESULT 14 READ AND FOLLOW ALL CAUTION AND DIRECTION LABELS ATTACHED TO THE DRYER WARNI...

Page 6: ...o eight operational running hours per day Clean lint drawer and screen every third or fourth load NOTE Frequency can best be determined at each location DAILY Beginning of each work shift Clean lint from the drawer and screen Inspect lint screen and replace if torn WEEKLY Clean lint accumulation from lint chamber thermostat and microprocessor temperature sensor sensor bracket area WARNING To avoid...

Page 7: ...king partially closed can result in slow drying and shutdown of heat circuit safety switches or thermostats When cleaning the dryer cabinet s avoid using harsh abrasives A product intended for the cleaning of appliances is recommended B ADJUSTMENTS 7 DAYS AFTER INSTALLATION AND EVERY 6 MONTHS THEREAFTER Inspect bolts nuts screws grounding connections and nonpermanent gas connections unions shutoff...

Page 8: ...nd drying efficiency will be adversely affected Ignition problems and sail switch fluttering problems on gas dryers may result and you also could have premature motor failure from overheating The air supply must be given careful consideration to insure proper performance of each dryer IMPORTANT Make up air must be provided from a source free of dry cleaning fumes Make up air that is contaminated b...

Page 9: ...anges must be made by a qualified technician C OPERATIONAL SERVICE CHECK PROCEDURE 1 Turn on electric power to the dryer 2 To start dryer a Display will read Select Cycle b Press E on the keypad of the microprocessor controller computer c The dryer will start and the display will show cycle type and minutes remaining 3 Make a complete operational check of all the operating controls to assure that ...

Page 10: ...ire operation of the dryer It accepts inputs and gives outputs to various parts throughout the dryer B GLOBAR The globar is a 120 VAC device When the Globar meets its peak radiant heat the I R sensor infrared sensor sensors the heat and powers the gas valve C GAS BURNER ASSEMBLY Gas heated dryers are equipped with a gas burner assembly consisting of two burner tubes two gas valves Glo Bar infrared...

Page 11: ...djustment The drive motor is a 3 4 HP motor and operates on 115 to 230 volts 50 60 Hz E BLOWER MOTOR AND IMPELLOR Viewing from the front of the dryer The blower motor is in the center of the dryer in the rear The impellor is a backward curved paddle wheel which is directly connected to the shaft of the blower motor F TUMBLER The tumbler consists of four ribs along with a front and back which are f...

Page 12: ...be caused by a lack of make up air I HI LIMIT GAS MODELS ONLY A hi limit thermostat is located at the top of the heat duct This is an automatic reset disc type thermostat set at 205 F 96 11 C If the flame in the burner should get too hot this thermostat will shut off the burner This is generally caused by low airflow through the dryer J AUTOMATIC RESET THERMOSTAT This is a 190º automatic thermosta...

Page 13: ...attached to the back of the lint drawer compartment The lint drawer switch insures that the dryer will operate only when the lint drawer is completely closed This is a safety device and should never be disabled M REVERSING REAR CONTROL PANEL ASSEMBLY This panel contains your blower contactor and your reverse contactor ...

Page 14: ...before and while making repairs Before considering replacement make sure that all connectors are in place and making proper contact A COMPUTER CONTROLS To Replace Computer 1 Discontinue electrical power to the dryer 2 Disconnect main power harness from rear of computer by squeezing locking tab and pulling all other connectors from rear of computer board 3 Disconnect the green ground wire from the ...

Page 15: ...and gently press into place 6 Reverse the above procedure Reestablish electrical power to the dryer To Replace Microprocessor Temperature Sensor Probe 1 Discontinue electrical power to the dryer 2 Remove lint drawer Remove two screws securing lint door stop and remove lint draw 3 Loosen the on 5 16 Pal Nut securing bracket assembly to the dryer and remove bracket from dryer 4 Disconnect sensor bra...

Page 16: ...power to the dryer 2 Close shutoff valve s in gas supply line 3 Disconnect gas valve wiring NOTE Identify location of each wire for correct reinstallation 4 Break union connection before gas valve 5 Loosen and remove the two T 20 Torx screws securing pipe brackets to burner 6 Remove gas valve manifold assembly from dryer 7 Remove valve mounting bracket manifold and piping from gas valve 8 Reverse ...

Page 17: ...hes When filled with water and pressure applied the water in the tube rises showing the exact water column pressure NOTE Manometers are available from the factory by ordering P N 122804 1 To test gas water column pressure a Connect water column test gauge connection to gas valve pressure tap 1 8 N P T This pressure tap is located on the outlet manifold side of the valve b Start dryer With burner o...

Page 18: ...sily damaged 5 Reverse the procedure for reinstalling valve assembly to the dryer WARNING Test all connections for leaks by brushing on a soapy water solution NEVER TEST FOR LEAKS WITH A FLAME NOTE There is no regulator provided in an L P dryer The L P gas pressure must be regulated at the source L P tank or an external regulator must be added to each dryer To Replace Burner Tubes 1 Refer to Repla...

Page 19: ...MODELS ONLY The sail switch is a heat circuit safety device which controls the burner circuit only When the dryer is operating and there is proper airflow the sail switch damper pulls in and closes the sail switch Providing all the other heat related circuits are functioning properly ignition should now be established If an improper airflow occurs the sail switch damper will release and the circui...

Page 20: ...move main door assembly from dryer follow main door removal procedure 2 Lay main door on flat surface with the rear of the door facing up 3 Drill all outer permiter pop rivets and remove door handle 4 Remove glass and clean all old sealant off main door This area must be completely cleaned for correct bonding 5 Apply a narrow bead of silicone P N 170730 all around main door area where glass will r...

Page 21: ...ure 5 Reestablish electrical power to the dryer To Replace Sail Switch 1 Discontinue electrical power to the dryer 2 Remove the two screws which hold sail switch box cover to sail switch box 3 Disconnect the two wires from the switch 4 Disassemble sail switch from mounting bracket by removing the two screws securing switch in place 5 Reverse this procedure for installing new sail switch Adjust sai...

Page 22: ...ocedure for removal of front panel assembly 4 Remove tumbler belt from motor 5 Follow procedure for front panel removal 6 Remove the three 1 4 20 x 1 2 Allen button head screw in center of basket 7 Remove tumbler assembly from front of dryer 8 Reassemble components onto dryer by reversing steps 2 through 7 9 Reestablish electrical power to the dryer ...

Page 23: ...over the tumbler grooves of belt or basket 6 Reassemble components putting belt around motor pulley after front support panel is re assembled 7 Reestablish electrical power to the dryer To Replace Drive Motor 1 Discontinue electrical power to the dryer 2 Remove drive belt 3 Disconnect wiring harness from motor 4 Remove bolts holding motor to mount and replace with new motor 5 Replace belt back aro...

Page 24: ... free from the motor shaft by means of a wheel puller to prevent damage to the motor shaft 5 Remove the bolts holding the motor to the motor mount and replace it with the new motor 6 Align motor with impellor face in plane with the motor mount at no less than 3 16 clearance 7 Install impellor onto new motor shaft 8 Reinstall the motor mount and reconnect the motor harness 9 Reestablish electrical ...

Page 25: ...escription of fault 2 Description of fault 3 Description of fault 4 Description of fault 5 Description of fault 2 LOWER DRYER FAULTS When a fault is recorded on the bottom pocket it can be viewed in this location If no fault s has been recorded then NO LOWER FAULTS will be displayed 1 Description of fault 2 Description of fault 3 Description of fault 4 Description of fault 5 Description of fault S...

Page 26: ...ile in normal operation and the faults were not cleared then these faults will be displayed in the upper display when the SERVICE SWITCH has been transitioned Pressing the medium key will enable the user to enter into service mode Entering and Exiting Service Mode Entering Transition the service switch to enter the service mode on coin models Enter the service mode by holding down the STOP and UP ...

Page 27: ...rrent running cycle 1 minute at a time Pressing the LOW DOWN ARROW key will decrease the time of the current running cycle 1 minute at a time Pressing the STOP key will pause the current running cycle Pressing the MED ENTER key will access the HELP MENU NOTE If the program key switch is toggled while a cycle is running and no diagnostic codes are being reported the current diagnostic cycle will co...

Page 28: ...ture Probe in Deg F or C AXL AXIAL TEMP PROBE Axial Thermistor Probe in Deg F or C RPM TUMBLER ROTATION SPEED Tumbler Speed in Revolutions Per Minute R P M MIN TIME REMAINING Time remaining in the diag cycle 0 to 99 in minutes CODE HELP CODE MENU Help Menu Code Help Codes T1 THERMOSTAT BURNER 1 Thermostat Heat Output Burner 1 ON OFF T2 THERMOSTAT BURNER 2 Thermostat Heat Output Burner 2 ON OFF H1 ...

Page 29: ...icular issue HELP CODE CODE DESCRIPTION 81 Lower Exhaust Probe Fault 86 Upper Exhaust Probe Fault 87 Upper Axial Probe Fault 82 Lower Axial Probe Fault 89 Upper Sail Switch Open Fault 88 Upper Sail Switch Closed Fault 84 Lower Sail Switch Open Fault 83 Lower Sail Switch Closed Fault 90 Upper Rotation Sensor Fault 91 Lower Rotation Sensor Fault 92 Gen 2 Card Reader Communication Fault E1 Top Radian...

Page 30: ...lt If the fault condition no longer exists the control will clear the fault condition and return to READY Mode SAIL SWITCH CLOSED D21 A sail switch closed fault occurs when a cycle is starting up from either READY Mode PAUSE Mode or any other idle state Once a temperature cycle is selected the control will start the time and verify the sail switch is open if it is not the control will display on t...

Page 31: ...r attempts to turn on the burner system and never receives a 120V return signal within a predefined time BURNER IGNITER FAULT COUNT E2 A burner ignition fault count will occur when a gas model dryer attempts to turn on the burner system and receives a 120V on the burner return signal but it does not transition to a 0V return signal within a predefined time EXHAUST HIGH LIMIT E3 This location is a ...

Page 32: ...yle of dryer and type of heat gas electric or steam 2 Serial Number Allows the manufacturer to gather information on your particular dryer 3 Type of Heat This describes the type of heat for your particular dryer gas either natural gas or L P gas electric or steam 4 Heat Input For Gas Dryers This describes the heat input in British thermal units per hour Btu hr or kilowatts kW 5 Orifice Size For Ga...

Page 33: ...er With burner on take a reading a Read water level at the inner tube Readings should be taken at eye level 6 If water column pressure is incorrect refer to TO ADJUST GAS PRESSURE 7 Reverse procedure for removing manometer C TOOL LIST Straight Head Screwdriver Phillips Head Screwdriver Torx T 20 Screwdriver Pliers 11 32 Nut Driver 3 4 Open End Wrench 3 4 Speed Rateheting Wrench 5 8 Deep Socket Wre...

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