Maytag Commercial Laundry MDG-35 Service Manual Download Page 1

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MDG-35

Service Manual

Whirlpool Corporation

Commercial Laundry

Benton Harbor, MI 49022

1-800-662-3587

Part No. 450365- 1

https://appliancetechmanuals.com

Summary of Contents for MDG-35

Page 1: ...MDG 35 Service Manual Whirlpool Corporation Commercial Laundry Benton Harbor MI 49022 1 800 662 3587 Part No 450365 1 https appliancetechmanuals com ...

Page 2: ...ollowed 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 illustrations include...

Page 3: ...ly or the steam 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 standards Please observe all safety precautions displayed on the equipment and specified in the installation manual included with the dryer FOR YOUR SAFETY Do not store or use gasoline or other flammable vapors and liquids in the v...

Page 4: ...usted 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 coated or contamina...

Page 5: ... 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 WARNIN...

Page 6: ...onal 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 the hazard of ...

Page 7: ...losed 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 valves and orif...

Page 8: ...iency 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 by dry cleaning ...

Page 9: ...he factory NOTE Any burner changes 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 opera...

Page 10: ...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 senses the heat and powers the gas valve C GAS BURNER ASSEMBLY Gas heated dryers are equipped with a gas burner assembly consisting of one burner tube one gas valve Glo Bar infrared sensor The inlet...

Page 11: ...ent The drive motor is a 1 4 HP motor and operates on 115 to 230 volts 50 60 Hz E MOTORIZED IMPELLOR BLOWER MOTOR Viewing from the front of the dryer The blower motor is in the center of the dryer in the front The motorized impellor is a backward curved fan which sits in a sealed box below the basket F TUMBLER The tumbler consists of three ribs a front and back which are forced together as an asse...

Page 12: ...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 thermostat located insid...

Page 13: ...ached 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 RELAY LOCATION The reversing relay is located behind your control panel https appliancetechmanuals com ...

Page 14: ...e 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 computer panel ...

Page 15: ... 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 bracket harness con...

Page 16: ...er 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 procedure for in...

Page 17: ... 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 on the correct w...

Page 18: ... 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 Replace G...

Page 19: ...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 circuit will open C TH...

Page 20: ...llow 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 rest 6 Install glass onto door adhesiv...

Page 21: ...h 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 sail switch as desc...

Page 22: ...e 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 https appliancetechmanuals com ...

Page 23: ...groovesde of belt or basket 6 Reassemble components putting belt around motor pulley after front support panel is re assembled 7 Reestablish electricla 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 around motor pulle...

Page 24: ...otor the hi limit exhaust probe and lint switch 3 Remove the lint screen 4 Remove the bottom toe panel 5 Carefully remove the four Acorn nuts that hold the blower housing to the lint housing 6 Remove and flip the housing Remove the four bolts holding the impellor on Replace impellor 7 Reverse steps 7 through 1 https appliancetechmanuals com ...

Page 25: ... 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 Single units will only have one set of faults 3 EVENTS E1...

Page 26: ...peration 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 ARROW key on no...

Page 27: ...ycle 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 continue to run i...

Page 28: ...eg 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 HEAT RETURN BUR...

Page 29: ...P 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 Radiant Sensor fault c...

Page 30: ...inue The control will display SAIL SWITCH CLOSED FAULT SELECT CYCLE TO RESTART when the fault is detected SAIL SWITCH OPEN D20 A sail switch open fault occurs when a cycle is starting from either READY Mode PAUSE Mode or any other idle state If the sail switch does not close within the allotted 10 seconds the control will log the fault and will not allow the cycle to continue The control will disp...

Page 31: ...SOR FAULT is identical to FORWARD ROTATION FAULT however it pertains to the reversing drive output instead of the forward drive output EVENTS RADIANT SENSOR FAULT COUNT E1 A radiant sensor fault count will occur when a gas model dryer 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 wi...

Page 32: ...d 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 Gas Dryers Gives ...

Page 33: ...adings should be taken at eye level b Correct readings should be Natural Gas 3 5 inches 8 7 mb water column L P Gas 10 5 inches 26 1 mb water column 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 Sp...

Page 34: ...Part No 450365 1 12 24 13 https appliancetechmanuals com ...

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Maytag Commercial Laundry MDG-35, Service Manual

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