Whirlpool MAYTAG MLG-52, Service Manual

Page 1: ...MLG 52 Service Manual Whirlpool Corporation Commercial Laundry Benton Harbor MI 49022 1 800 662 3587 Part No 450364 1 ...

Page 2: ...nstructions 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 il...

Page 3: ...gereux WARNING Children 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...

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 completed can create a fire hazard 12 Do not operate steam dryers with more than 150 PSI 10 34 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 ...

Page 6: ...wn are for average usage which is considered six to 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 tempe...

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: ... or contact the 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 Select a cycle using 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...

Page 10: ...peration 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 two each of a burner tube gas valve Glo Bar and infrar...

Page 11: ...adjustment The drive motor is a 1 3 HP motor and operates on 115 to 230 volts 50 60 Hz E IMPELLOR BLOWER MOTOR Viewing from the rear The blower motor assembly consists of a motor fan and motor mount This assembly mounts to the blower housing at the lower back wall of each tumbler F TUMBLER The tumbler has four ribs a front felt and a back felt which are used to seal the tumbler to the front and re...

Page 12: ...negative pressure inside the burner box and this negative pressure pulls in the round damper and activates the sail switch If there is improper airflow the damper will not pull in preventing the burner from starting Improper airflow can be caused by improperly designed exhaust ducting where the duct run is too long or has too many sharp bends in it It can also be caused by faulty seals in the drye...

Page 13: ...d at the bottom of the lint compartment Simply grab the lint drawer handle slide out the drawer brush off the lint and slide the drawer back in The lint screen must be kept clean in order for the dryer to operate properly and efficiently L LINT DRAWER SWITCH The lint drawer switch is located in the rear of the lint compartment The lint drawer switch insures that the dryer will operate only when th...

Page 14: ...for removing control and lint door toe panel 3 Disconnect main power harness from rear of computer by squeezing locking tab and pulling all other connectors from rear of computer board 4 Disconnect the green ground wire from the computer panel 5 Disconnect keypad ribbon from the computer 6 Remove the four hex nuts securing the computer cover to the control panel Remove the eight Phillips pan head ...

Page 15: ...on the label to the rectangular cutout in the panel and gently press into place 6 Reverse the above procedure 7 Reestablish electrical power to the dryer To Replace Microprocessor Exhaust Temperature Sensor Probe 1 Discontinue electrical power to the dryer 2 Follow procedure for removing control door and lint door toe panel 3 Loosen the 5 16 Pal nut securing sensor bracket assembly to the dryer 4 ...

Page 16: ...everse procedure for reinstallation To Replace Globar 1 Discontinue electrical power to the dryer 2 Follow procedure for Removing Burner Tube Assembly 3 Disconnect Glo Bar connector 4 Disassemble ignitor from burner by removing the single ignitor mounting screw 5 Reverse procedure for installing new Glo Bar ignitor To Replace Gas Valve 1 Discontinue electrical power to the dryer 2 Follow procedure...

Page 17: ...illed 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 corr...

Page 18: ...ated L P gas most countries install blocking pin P N 140414 Reinstall the burner tube into the burner tube receiver bracket Connect the union and electrical plug Repeat these steps for the other burner Affix L P Conversion Label P N 114515 to the dryer s data label Complete L P Kit Conversion Confirmation Label P N 114083 and affix this label as close as possible to the dryer s existing dryer rati...

Page 19: ...ires from thermostat and remove the two 11 32 Hex nuts 4 Reverse this procedure for installing a hi limit thermostat 5 Reestablish electrical power to the dryer D SAIL SWITCH ASSEMBLY C THERMOSTATS To Replace Burner Hi Limit Thermostat This thermostat is an important safety device serving as an added protection against failure of the airflow sail switch to open in the event of motor failure or red...

Page 20: ...omputer board harness 5 Disassemble door switch from bracket by removing two Phillips screws securing the switch to the panel 6 Reverse this procedure for installing new door switch 7 Reestablish electrical power to the dryer IMPORTANT Under no circumstances should the door switch be disabled To Install New Main Door Glass 1 Remove main door assembly from dryer 2 Lay main door on flat surface with...

Page 21: ...llow for easier removal of panel 8 Remove wires running up through front panel 9 Pull top of panel out until roughly a 35 degree angle and then lift to remove 10 Reverse this procedure for installing new front panel 11 Tighten belt to original specifications 12 Reestablish electrical power to the dryer To Replace Tumbler 1 Discontinue electrical power to the dryer 2 Remove tumbler belt from motor ...

Page 22: ...mbled 6 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 For top pocket motor it will be necessary to remove the top of the bottom pocket exhaust section This is held in by two nuts and six TORX screws refer to drawing below 4 Remove nuts holding motor mount to base of machine the...

Page 23: ...d 3 Disconnect the harness from blower motor 4 Disconnect and remove relay panel assembly 5 Remove four nuts holding blower motor mount to blower housing 6 Pull out blower motor mount 7 Remove nuts holding fan to motor and remove fan 8 Unbolt motor from mount and remove 9 Reverse procedure for installation ...

Page 24: ...n 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 E...

Page 25: ...he 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 non coin models ...

Page 26: ...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 27: ...B BLOWER Fan output ON OFF F FORWARD Forward drive output ON OFF R REVERSE Shows reversing relay is on ON OFF D DOOR Main Door OPEN CLOSED L LINT Lint Door OPEN CLOSED P WATER PRESSURE H2 O Input ON OFF S SAIL SWITCH Sail Switch OPEN CLOSED V VAULT SWITCH Vault Switch OPEN CLOSED W WATER OUTPUT S A F E output ON OFF 3 HELP MENU The help menu allows the user to view the status of different parts of...

Page 28: ...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 29: ... 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 display SAIL SWITCH OPEN FAULT CHECK MAIN DOOR AND LINT ACCESS AND SELECT CYCLE TO RESTART A sail switch open fault can also occur once a cycle is in process If the control detec...

Page 30: ...y to reversing machines The way this fault works is if the dryer is reversing and is running a cycle that has the reversing option enabled if a rotation sensor fault condition is detected the drive output would be shut off Then the dryer will transition to a reversing drive output If the dryer continues to run without an issue the machine will continue to run with the forward drive output disabled...

Page 31: ...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 32: ...Place manometer in a position so that readings can be taken at eye level 4 Fill manometer with water as shown in the illustration to the zero level 5 Start dryer With burner on take a reading a Read water level at the inner tube Readings should be taken at eye level b Correct readings should be Natural Gas 3 0 inches 6 9 mb water column L P Gas 10 5 inches 26 1 mb water column 6 If water column pr...

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