Alliance Laundry Systems DCB75FG, DTB634, DTB75CG, DTB74EG, DTB75FG Service Manual

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Page 1

Drying Tumblers

75 Pound Capacity

634 Liter Capacity

Refer to Page 5 for Model Numbers

Service

www.comlaundry.com

T012C

T012c

Part No. M411433R1

October 2001

Page 2

Section 1 – Safety Information

Locating An Authorized Service Person..................4

Section 2 – Introduction

Model Identification.................................................5

Customer Service.....................................................6

Serial Plate Location................................................6

Safety Warnings and Decals....................................7

Safety Precautions for Servicing Tumblers .............7

How A Tumbler Works ...........................................8

Section 3 – Troubleshooting

1. Motor Does Not Start......................................11

2. Motor Overload Protector Cycles Repeatedly12

3. Motor Runs But Cylinder Does Not Turn.......12

4. Motor Does Not Stop......................................12

5. Heating Element Does Not Heat

Or Burner Does Not Ignite..............................13

6. Igniter Glows, Flame Sensor Opens But No

Ignition - Gas Models .....................................15

7. Burner Ignites And Goes Out Repeatedly

- Gas Models...................................................15

8. Heating Element Or Burner Shuts-off

Prematurely.....................................................16

9. Heating Element Or Burner Repeatedly

Cycles Off On High Limit Thermostat...........16

10. Heating Element Or Burner

Does Not Shut-off ..........................................17

11. Clothes Do Not Dry ........................................17

12. Tumbler Overheating......................................17

13. Burners Not Burning Properly - Gas Models .18

14. Cylinder Door Opens During Operation.........18

15. Tumbler Runs But No Steam To Coils

- Steam Models ...............................................18

16. Water In Steam Line - Steam Models.............19

17. Troubleshooting Electronic Control Models ..19

18. Tumbler Will Not Start, Time On Drying Timer,

Door Closed (Manual Timer Models).............20

19. Motor Runs, Time On Drying Timer But No

Heat .................................................................21

20. Igniter Does Not Glow....................................22

21. Igniter Glows Constantly................................22

22. Igniter Glows, Cycles Off But Burner Does Not

Ignite ...............................................................22

23. Igniter Does Not Spark ...................................23

Section 4 – Grounding

Grounding Instructions ..........................................25

Section 5 – Service Procedures

24. Control Panel ..................................................27

25. Push-to-Start Switch .......................................27

26. Cooling, Drying, or Run Light........................27

27. Relay (Manual Timers Models)......................29

28. Resistor 208 or 240 Volt/60 Hertz..................29

29. Cooling or Drying Timer................................29

30. Cooling or Drying Timer Motor.....................30

31. Coin Meter ......................................................31

32. Coin Meter Timer Motor ................................32

33. Coin Meter Run or Heat Switch .....................32

34. Electronic Control (MM Models) ...................33

35. Reversing/nonreversing Switch ......................33

36. Battery (MM Model) ......................................33

37. Control Thermostat.........................................35

38. Thermistor.......................................................37

39. Gas Valve........................................................38

40. Diode Logic Board..........................................38

41. Main Coil ........................................................38

42. Igniter Bracket ................................................38

43. Sensor..............................................................40

44. Igniter..............................................................40

45. Ignition Control...............................................40

46. Gas Valve........................................................40

47. Main Coil ........................................................41

48. Burner Tube ....................................................41

49. Contactors And Terminal Block.....................41

50. Heater Element ...............................................42

51. Stove High Limit Thermostat .........................44

52. Cabinet High Limit Thermostat......................45

53. High Limit Thermostat ...................................46

54. Steam Coils.....................................................46

55. Loading Door Assembly.................................47

56. Loading Door Hinge.......................................47

57. Loading Door Handle .....................................48

58. Front Panel......................................................49

59. Loading Door Switch......................................50

60. Loading Door Switch Rod..............................50

61. Airflow Switch Assembly...............................51

62. Wire-Way Cover.............................................51

63. Drive Guard ....................................................52

the expressed written consent of the publisher.

M411433 1

Page 3

64. Drive Belt........................................................52

65. Drive Chain.....................................................53

66. Idler Housing Assembly .................................53

67. Idler Sprocket..................................................56

68. Sheave.............................................................56

69. Drive Sprocket/Pulley.....................................56

70. Idler Shaft........................................................56

71. Cylinder Sprocket/Upper Sheave....................57

72. Cylinder Assembly..........................................57

73. Trunnion Housing Assembly..........................58

74. Trunnion Shaft Assembly ...............................59

75. Motor And Fan Assembly...............................60

76. Cylinder Drive Motor .....................................62

77. Reversing Control Electrical Components......64

Section 6 – Adjustments

78. Leveling Legs..................................................67

79. Main Gas Burner Air Inlet Shutters................68

80. Airflow Switch................................................69

81. Loading Door Switch......................................71

82. Loading Door Strike .......................................72

83. Drive Belt Tension..........................................72

84. Drive Tension..................................................75

85. Cylinder Clearance..........................................76

2 M411433

Page 4

Section 1

Safety Information

Throughout this manual and on machine decals, you will find precautionary statements (“CAUTION”, “WARNING”, and “DANGER”) followed by specific instructions. These precautions are intended for the personal safety of the operator, user, servicer, and those maintaining the machine.

a DANGER

Danger indicates the presence of a hazard that will cause severe personal injury, death, or substantial property damage if the danger is ignored.

a WARNING

Warning indicates the presence of a hazard that can cause severe personal injury, death, or substantial property damage if the warning is ignored.

a CAUTION

Caution indicates the presence of a hazard that will or can cause minor personal injury or property damage if the caution is ignored.

Additional precautionary statements (“IMPORTANT” and “NOTE”) are followed by specific instructions.

IMPORTANT

The word “IMPORTANT” is used to inform the reader of specific procedures where minor machine damage will occur if the procedure is not followed.

NOTE

The word “NOTE” is used to communicate installation, operation, maintenance or servicing information that is important but not hazard related.

In the interest of safety, some general precautions relating to the operation of this machine follow.

WARNING

• Failure to install, maintain and/or operate this product according to the manufacturer’s instructions may result in conditions which can produce serious injury, death and/or property damage.

• Do not repair or replace any part of the product or attempt any servicing unless specifically recommended or published in this Service Manual and that you understand and have the skills to carry out.

• Whenever ground wires are removed during servicing, these ground wires must be reconnected to ensure that the product is properly grounded and to reduce the risk of fire, electric shock, serious injury or death.

W006R1

M411433 3

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Section 1 Safety Information

IMPORTANT INFORMATION: During the lifetime of your tumbler, it may require service. The information contained in this manual was written and is intended for use by qualified service technicians who are familiar with the safety procedures required in the repair of your tumbler, and who are equipped with the proper tools and testing equipment.

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W240

WARNING

Repairs that are made to your products by unqualified persons can result in hazards due to improper assembly or adjustments subjecting you, or the inexperienced person making such repairs, to the risk of serious injury, electrical shock or death.

W007

CAUTION

If you or an unqualified person perform service on your product, you must assume the responsibility for any personal injury or property damage which may result. The manufacturer will not be responsible for any injury or property damage arising from improper service and/or service procedures.

NOTE: The WARNING and IMPORTANT instructions appearing in this manual are not meant to cover all possible conditions and situations that may occur. It must be understood that common sense, caution and carefulness are factors which CANNOT be built into this tumbler. These factors MUST BE supplied by the person(s) installing, maintaining or operating the tumbler.

Always contact your dealer, distributor, service agent or the manufacturer on any problems or conditions you do not understand.

Locating An Authorized Service Person

Alliance Laundry Systems is not responsible for personal injury or property damage resulting from improper service. Review all service information before beginning repairs.

Warranty service must be performed by an authorized technician, using authorized factory parts. If service is required after the warranty expires, Alliance Laundry Systems also recommends contacting an authorized technician and using authorized factory parts.

W008

4 M411433

Page 6

Section 2

Introduction

Model Identification

Information in this manual is applicable to these models:

Gas Steam Electric

AT B7 5C G

DCB75CG

DCB75FG

DTB634

DTB75CG

DTB75EG DTB75FG

JCB75CG

JT75CG

JT75EG JTB75CG JTB75EG

SCB75CG

ST75CG STB75CG STB75EG

STB634

AT B7 5C S H DCB75CSH DCB75CSL DTB75CSH

DTB75CSL

JCB75CSH JCB75CSL

JT75CSH JT75CSL

JTB75CSH

JTB75CSL SCB75CSH SCB75CSL

ST75CSH ST75CSL

STB75CSH

STB75CSL

DCB75CE DTB75CE

JCB75CE

JT75CE

JTB75CE

SCB75CE

ST75CE

STB75CE

M411433 5

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Section 2 Introduction

Customer Service

If literature or replacement parts are required, contact the source from whom the machine was purchased or contact Alliance Laundry Systems at (920) 748-3950 for the name and address of the nearest authorized parts distributor.

For technical assistance, call (920) 748-3121.

Serial Plate Location

When calling or writing about your product, be sure to mention model and serial numbers. Model and serial numbers are located on serial plate(s) as shown.

T419IE3B

6 M411433

Page 8

Safety Warnings and Decals

SAFETY WARNINGS and decals have been provided in key locations to remind you of important precautions for the safe operation and maintenance of your tumbler. Please take the time to review these warnings before proceeding with service work.

All decals have been designed and applied to withstand washing and cleaning. Decals should be checked periodically to be sure they have not been damaged, removed, or painted. Refer to Parts Manual for ordering replacement decals.

Safety Precautions for Servicing Tumblers

• Disconnect electrical service.

• Shut off supply gas valve before servicing gas

components.

Section 2 Introduction

• Control panel and access panel MUST be reinstalled after inspection or servicing of tumbler is completed.

• Use a non-corrosive leak detection solution to check all pipe connections for gas leaks. DO NOT USE AN OPEN FLAME TO CHECK FOR GAS LEAKS!

• Chain/Drive guard MUST be reinstalled after inspection or servicing of tumbler is completed.

• Belt guard MUST be reinstalled after inspection or servicing of tumbler is completed.

• Contactor box cover MUST be reinstalled after inspection or servicing of electric and/or reversing tumbler is completed.

• Loading door switch MUST be operational before putting tumbler into service.

• Junction box cover MUST be reinstalled after inspection or servicing of tumbler is completed.

M411433 7

Page 9

Section 2 Introduction

How A Tumbler Works

Fresh Air Combustion Air Mixed Air

T008CE1A

Exhaust Air

Standard Models

The tumbler uses heat, air and movement to dry loads of laundry.

When the motor is started, the exhaust fan pulls air in through the air intake and over the heat source (burner flame for gas, heating element for electric, and coil for steam).

The heated air moves into the cylinder, where it is circulated through the laundry by the tumbling action of the cylinder.

The air then passes through the lint filter, exhaust fan, and is vented to the outdoors.

NOTE: In Energy Saver Models, some of the exhaust air is recirculated. Refer to illustration on page 9.

8 M411433

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Section 2 Introduction

Fresh Air Combustion Air Mixed Air Recirculating Air Exhaust Air

T007CE1A

Energy Saver Models

M411433 9

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Section 3

Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

IMPORTANT: Refer to appropriate wiring diagram for aid in testing tumbler components.

1. MOTOR DOES NOT START

POSSIBLE CAUSE TO CORRECT

Electrical power off or fuses blown. • Check power and fuses, replace fuses if necessary Loading door not closed or inoperative door switch. • Close door, or test switch and replace if inoperative. Door switch improperly adjusted. • Refer to Adjustment Section for door switch adjustment. Trunnion shaft assembly binding in

trunnion housing bearings. Start circuit not completed. • Press start switch, or test switch and replace if

Idler shaft binding in idler housing bearings. • Replace bearings. Inoperative motor. • Have motor tested and replace if inoperative. Non-Metered Models: Timer improperly set. • Turn drying timer clockwise to desired setting. Non-Metered Models: Inoperative timer. • Test timer and replace if inoperative. Metered Models: Improper coins inserted in

accumulator. Metered Models: Accumulator knob improperly

set after coins were inserted. Metered Models: Inoperative run switch

(accumulator). Broken, loose, or incorrect wiring. • Refer to wiring diagram located on back of tumbler or in

• Replace trunnion housing bearings.

inoperative.

• Check that proper coins are inserted.

• Turn knob clockwise to its full limit of travel.

• Test run switch and replace if inoperative.

literature packet.

W002

M411433 11

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Section 3 Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

2. MOTOR OVERLOAD PROTECTOR CYCLES REPEATEDLY

POSSIBLE CAUSE TO CORRECT

Incorrect voltage. • Refer to the Installation Manual (supplied with tumbler)

for electrical requirements.

Clothes load too large. • Remove part of load. Cylinder is binding. • Check cylinder for binding. Refer to Adjustment Section

for cylinder adjustment.

Inadequate wiring. • Check with electrician to ensure that wiring is adequate. Inadequate make-up air. • Refer to Installation Manual (supplied with tumbler) for

make-up air requirements. Poor housekeeping. • Clean lint accumulation on and around the motor. Broken, loose, or incorrect wiring. • Refer to wiring diagram located on back of tumbler or in

literature packet.

W002

3. MOTOR RUNS BUT CYLINDER DOES NOT TURN

POSSIBLE CAUSE TO CORRECT

Motor drive pulley loose. • Tighten setscrews. Sheave loose. • Tighten setscrews. Broken or loose belt. • Replace or adjust belt. Refer to Adjustment Section for

proper belt adjustment. Broken or loose drive chain. • Replace or adjust chain. Refer to Adjustment Section for

proper chain adjustment. Cylinder is binding. • Check cylinder for binding. Refer to Adjustment Section

for proper cylinder adjustment.

4. MOTOR DOES NOT STOP

POSSIBLE CAUSE TO CORRECT

Inoperative door switch or switch is out-ofadjustment.

• Test switch and replace if inoperative. Refer to

Adjustment Section for proper switch adjustment. Non-Metered Models: Inoperative timer. • Test timer and replace if inoperative. Metered Models: Inoperative accumulator. • Test accumulator and replace if inoperative. Incorrect wiring. • Refer to wiring diagram located on the back of tumbler or

in literature packet.

12 M411433

Page 13

Section 3 Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

5. HEATING ELEMENT DOES NOT HEAT OR BURNER DOES NOT IGNITE

POSSIBLE CAUSE TO CORRECT

Improper or inadequate exhaust system. • Refer to the Installation Manual (supplied with tumbler)

for exhaust system requirements. Blown fuses or tripped circuit breakers. • Check fuses or circuit breakers. Drying timer not selected or inoperative. • Set drying timer or replace if inoperative. Inoperative thermostat. • Test thermostat and replace if inoperative. Electric Models:

• Check heat contactors and elements. Replace if necessary.

Inoperative heating elements. Gas Models:

Insufficient gas supply.

• Open partially closed gas shut-off valve, or correct low gas pressure. Check inlet pressure and compare to pressure specified on serial plate. If pressure cannot be obtained, contact gas supplier.

Gas Models: Incorrect orifices.

• Tumbler is equipped for type of gas specified on serial plate. If orifices are different from that specified on serial plate, obtain and install proper orifices.

Gas Models: (IEI Ignition)

• Test igniter and replace if inoperative.

Inoperative igniter. Gas Models: (IEI Ignition)

• Test igniter control and replace if inoperative.

Inoperative igniter control. Gas Models:

• Test main coil and replace if inoperative.

Inoperative Main Coil Gas Models:

Inoperative Redundant Coil Gas Models: (Glow Bar Ignition)

• Test redundant coil and replace complete gas valve if inoperative.

• Test igniter and replace if inoperative.

Inoperative igniter. Gas Models: (Glow Bar Ignition)

• Test sensor and replace if inoperative.

Inoperative sensor. Gas and Electric Models:

• Test thermostat and replace if inoperative.

Inoperative high limit thermostat.

W002

(continued on next page)

M411433 13

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Section 3 Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

5. HEATING ELEMENT DOES NOT HEAT OR BURNER DOES NOT IGNITE (cont.)

POSSIBLE CAUSE TO CORRECT

Gas and Electric Models: Inoperative airflow switch

• Clean lint compartment after every eight hour shift.

• Check back draft damper for foreign objects, lint

accumulation, or other causes that may prevent damper from opening.

• Check ductwork for lint build-up. Refer to Installation Manual (supplied with tumbler) to ensure that ductwork

and make-up air openings are sized properly.

W002

• Check exhaust outlet. If a screen has been improperly installed on the outlet, it may be clogged with lint or frozen over in winter.

Gas and Electric Models: Airflow switch out of adjustment.

• Refer to Adjustment Section for airflow switch adjustment.

Lint door panel not closed properly. • Open lint door panel, place lint door panel back on

tumbler (ensuring a tight fit) then latch.

Broken, loose, or incorrect wiring. • Refer to wiring diagram located on back of tumbler or in

literature packet.

14 M411433

Page 15

Section 3 Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

6. IGNITER GLOWS, FLAME SENSOR OPENS BUT NO IGNITION - GAS MODELS (White Rodgers Glow-bar Ignition)

POSSIBLE CAUSE TO CORRECT

Insufficient gas supply. • Is manual shut-off valve in full open position? Check gas

pressure. Gas flow, but no ignition. • Gap between igniter and burner must be 1/8 – 1/4 inch. No gas flow through gas valve. • Check for 80 – 120 Volts between red and white wires on

gas valve.

• If correct voltage is present and redundant coil does not click open, replace complete gas valve.

W002

• If correct voltage is not present, replace diode logic board.

• If correct voltage is present and redundant coil clicks

open, check for 40 – 60 Volts across the purple wires on the main coil after the igniter cycles off.

• If voltage is present and main coil does not click open, replace main coil.

• If no voltage is present, replace diode logic board.

7. BURNER IGNITES AND GOES OUT REPEATEDLY - GAS MODELS (Glow-Bar Ignition)

POSSIBLE CAUSE TO CORRECT

Burner heat not holding sensor contacts open. • Replace sensor. Insufficient gas pressure. • Check gas supply and pressure. A low flame will not

maintain radiation to sensor. Burner ports plugged or dirty. • Check burner tubes for build-up. Improper or inadequate exhaust system or make-up

air.

• Refer to Installation Manual (supplied with tumbler) for

exhaust and make-up air requirements. Inoperative high limit thermostat. • Test thermostat and replace in inoperative. Improper orifices. • Tumbler is equipped for type of gas specified on serial

plate. If orifices are different from that specified on serial

plate, obtain and install proper orifices.

M411433 15

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Section 3 Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

8. HEATING ELEMENT OR BURNER SHUTS-OFF PREMATURELY

POSSIBLE CAUSE TO CORRECT

Improper or inadequate exhaust and/or make-up air system.

• Refer to Installation Manual (supplied with tumbler) for

exhaust and make-up air requirements. Gas Models: Insufficient gas supply • Open partially closed gas shut-off valve, or correct low

pressure. Gas Models: Tumbler not properly equipped for

type of gas used.

• Tumbler is equipped for type of gas specified on serial plate. If orifices are different from that specified on serial plate, obtain and install proper orifices.

Gas Models: Improperly adjusted burner flame. • Refer to Adjustment Section for burner flame adjustment. Gas Models: (Glow-Bar Ignition) Sensor contact

• Replace sensor.

closing. Cycling off on limit thermostat. • Refer to Paragraph 9. Broken, loose or incorrect wiring. • Refer to wiring diagram located on back of tumbler or in

literature packet.

W002

9. HEATING ELEMENT OR BURNER REPEATEDLY CYCLES OFF ON HIGH LIMIT THERMOSTAT

POSSIBLE CAUSE TO CORRECT

External exhaust system is longer than recommended or inadequate make-up air.

• Refer to Installation Manual (supplied with tumbler) for

exhaust and make-up air requirements.

Clogged lint screen. • Remove screen and clean. Lint screen and compartment

should be cleaned after every eight hour shift. Lint in tumbler ducts. • Clean tumbler ducts Lint in external exhaust system. • Disassemble exhaust system and clean. High limit thermostat cycling at too low a

• Replace thermostat.

temperature. Lint door panel not closed properly. • Remove lint door panel, place lint door panel back on

tumbler (ensuring a tight fit) then latch.

16 M411433

Page 17

Section 3 Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

10. HEATING ELEMENT OR BURNER DOES NOT SHUT-OFF

POSSIBLE CAUSE TO CORRECT

Gas Models:

• Replace gas valve. Impurities on gas valve seat, preventing valve from closing.

Inoperative drying timer, relay or contactor. • Replace timer, relay or contactor. Incorrect wiring. • Refer to wiring diagram located on back of tumbler or in

literature packet.

W002

11. CLOTHES DO NOT DRY

POSSIBLE CAUSE TO CORRECT

Heat source inoperative. • Refer to Paragraph 5. Too much water in articles being dried. • Remove excess water. Clothes load too large. • Remove part of load. Improper or inadequate exhaust system. • Refer to Installation Manual (supplied with tumbler) for

exhaust requirements. Heat source shuts-off prematurely. • Refer to Paragraph 8. Drying timer improperly set. • Set selector for higher setting. Incorrect voltage. • Refer to Installation Manual (supplied with tumbler) for

electrical requirements. Inadequate make-up air. • Refer to Installation Manual (supplied with tumbler) for

make-up air requirements.

12. TUMBLER OVERHEATING

POSSIBLE CAUSE TO CORRECT

Gas Models: Incorrect main burner orifices. • Replace orifices. Gas Models: Gas pressure too high. • Gas pressure must be as specified on serial plate. Inadequate make-up air. • Refer to Installation Manual (supplied with tumbler) for

make-up air requirements. Lint accumulation. • Remove lint. Restricted or inadequate exhaust system. • Remove obstruction or lint build-up from exhaust

ductwork. Refer to the Installation Manual (supplied

with tumbler) for exhaust system requirements. Inoperative thermostat. • Replace thermostat.

M411433 17

Page 18

Section 3 Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

13. BURNERS NOT BURNING PROPERLY - GAS MODELS

POSSIBLE CAUSE TO CORRECT

Burner air shutters incorrectly adjusted. • Refer to Adjustment Section for proper flame adjustment. Dirt in burners. • Disassemble burners and blow out the dirt. Gas pressure too high. • Check serial plate on back of the tumbler for correct gas

pressure. Incorrect orifices. • Tumbler is equipped for type of gas specified on serial

plate. If orifices are different from that specified on serial

plate, obtain and install proper orifices. Restricted or blocked exhaust duct. • Disassemble and clean exhaust system. Airflow switch not functioning properly. • Check adjustment and replace airflow switch if necessary.

W002

14. CYLINDER DOOR OPENS DURING OPERATION

POSSIBLE CAUSE TO CORRECT

Door strike improperly adjusted. • Refer to Adjustment Section for door strike adjustment. Tumbler improperly leveled. • Refer to Adjustment Section for leveling leg adjustment.

15. TUMBLER RUNS BUT NO STEAM TO COILS - STEAM MODELS

POSSIBLE CAUSE TO CORRECT

Valves closed. • Check all valves in supply and return lines, make sure

they are open. Blocked steam trap. • Remove trap and clean. Replace if inoperative. Inoperative solenoid valve. • Check operation of solenoid valve. Incorrect installation of check valve. • Check for inlet and outlet markings on check valve, and

invert is necessary. Clogged strainer. • Remove strainer and clean. Inoperative timer or thermostat. • Test timer or thermostat, replace if inoperative.

18 M411433

Page 19

Section 3 Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

16. WATER IN STEAM LINE - STEAM MODELS

POSSIBLE CAUSE TO CORRECT

Incorrect installation of steam piping. • Refer to Installation Manual (supplied with tumbler) for

steam requirements. Trap functioning improperly. • Check trap for size and capacity. If trap is dirty or

sluggish, clean thoroughly or replace. Check return line

for high back pressure.

W002

17. TROUBLESHOOTING ELECTRONIC CONTROL MODELS

PROBLEM POSSIBLE CAUSE TO CORRECT

Display shows “PF” (MM models)

Tumbler has not been run in last six days.

A custom cycle has not been

Power tumbler for at least two continuous days to recharge battery.

Enter a custom cycle into memory.

programmed into memory. Discharged battery. If tumbler has been powered for at least two

continuous days, replace battery.

Door Open light and display flash with door closed

Door switch needs adjustment. Adjust and test door switch. Door switch faulty. Replace door switch. Electrical service connected

incorrectly.

Check service connections to terminal block in junction box. For 120 or 240 Volt tumblers, neutral wire must be connected to terminal marked “NEUT”. On single phase tumblers, hot wire must be connected to terminal marked “L1”. A ground wire must be secured to the ground screw in the junction box.

Display shows “SH” and signals sounds

Temperature at sensor is over 191°F (88.3°C).

Allow tumbler to cool and press ON/SELECT pad. If display still shows “SH”, replace sensor.

Temperature sensor shorted. Replace temperature sensor.

Display shows “OP” and signal sounds three minutes after

Temperature at sensor is under 24°F (-4.4°C).

Temperature sensor open. Replace temperature sensor.

If the temperature of the tumbler is above 24°F (-4.4°C), replace temperature sensor.

tumbler is started

M411433 19

Page 20

Section 3 Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

18. TUMBLER WILL NOT START, TIME ON DRYING TIMER, DOOR CLOSED (MANUAL TIMER MODELS)

W002

CHECK FOR

LINE VOLTAGE

INTO DOOR SWITCH

CHECK

ELECTRICAL SERVICE

TO TUMBLER

(Fuses/Circuit Breaker)

CHECK FOR

LINE VOLTAGE ON

TERMINAL 1 OF

CONTROL RELAY

CHECK FOR

LINE VOLTAGE

OUT OF

DOOR SWITCH

NO NO

HAS SWITCH ROD

MECHANICALLY

ACTUATED

DOOR SWITCH?

ADJUST

DOOR SWITCH

ROD

YES YES YES

CHECK FOR

LINE VOLTAGE INTO

PUSH-TO-START

SWITCH

NO NO

YES

REPLACE

DOOR

SWITCH

CHECK FOR

LINE VOLTAGE AT

TERMINAL 3 OF

CONTROL RELAY

CHECK FOR

BROKEN

WIRE

OR POOR

CONNECTION

HARNESS

PLUG

PRESS

PUSH-TO-START

SWITCH. CHECK FOR

LINE VOLTAGE OUT OF PUSH-TO-START

SWITCH

YESYES

CHECK FOR

LINE VOLTAGE ACROSS

COIL TERMINALS

OF CONTROL RELAY

CHECK FOR

LINE VOLTAGE ON

TERMINAL B

OF DRYING TIMER

REPLACE

TIMER

CHECK FOR

LINE VOLTAGE

TO MOTOR

YES

REPLACE

MOTOR

YES

REPLACE

RELAY

20 M411433

CHECK FOR

BROKEN WIRE

FROM CONTROL

RELAY TERMINAL 1

REPLACE

PUSH-TO-START

SWITCH

CHECK FOR

BROKEN WIRE

OR POOR

CONNECTION

AT HARNESS PLUG

Page 21

Section 3 Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

19. MOTOR RUNS, TIME ON DRYING TIMER BUT NO HEAT

W002

POWER OUT OF MAIN CONTROL

THERMOSTAT

YES

CHECK THE

IGNITION CIRCUIT

CHECK FOR BROKEN OR

LOOSE WIRE AT

HARNESS PLUG

YES NO NO NO NO

REPAIR

WIRE

NO YES YES YES

POWER INTO

MAIN CONTROL

THERMOSTAT

YES

REPLACE

MAIN CONTROL

THERMOSTAT

POWER ON

RED WIRE

FROM MOTOR

REPLACE

MOTOR

TERMINAL 6 OF

CONTROL RELAY

BROKEN WIRE TO

MAIN CONTROL

THERMOSTAT

POWER INTO

AIRFLOW

SWITCH

CHECK FOR

LOOSE OR

BROKEN WIRE

FROM MOTOR

POWER ON

YES YES

LOOSE OR

POWER OUT OF

AIRFLOW

SWITCH

AIRFLOW

SWITCH

CLOSED

POWER ON

TERMINAL 4 OF

CONTROL RELAY

POWER ACROSS

COIL TERMINALS OF

CONTROL RELAY

YES

REPLACE

CONTROL RELAY

POWER INTO

CABINET

HIGH LIMIT

THERMOSTAT

CHECK FOR

BROKEN WIRE

FROM

AIRFLOW SWITCH

YES

ADJUST

AIRFLOW

SWITCH

POWER OUT OF

CABINET

HIGH LIMIT

THERMOSTAT

NO NO NO

REPLACE

THERMOSTAT

M411433 21

POWER INTO

BURNER

HIGH LIMIT

THERMOSTAT

CHECK FOR

BROKEN WIRE

FROM CABINET

HIGH LIMIT

YES YESYES

POWER OUT OF

BURNER

HIGH LIMIT

THERMOSTAT

REPLACE

BURNER

HIGH LIMIT

THERMOSTAT

YES

REPLACE AIRFLOW

SWITCH

CHECK FOR LOOSE

OR BURNED

CONNECTION

AT HARNESS PLUG

Page 22

Section 3 Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

20. IGNITER DOES NOT GLOW (White Rodgers Glow-Bar System)

W002

ARE 80 - 120 VOLTS

PRESENT BETWEEN

BLACK WIRE AND GROUND ON MAIN

THERMOSTAT?

CHECK

HEAT CIRCUIT

YES

ARE 80 - 120 VOLTS

PRESENT BETWEEN

WIRES OF IGNITER

BRACKET?

YES

REPLACE

IGNITER

21. IGNITER GLOWS CONSTANTLY

REPLACE

SENSOR

22. IGNITER GLOWS, CYCLES OFF BUT BURNER DOES NOT IGNITE

ARE 80 - 120 VOLTS

PRESENT BETWEEN

EACH OF THE PURPLE

WIRES OF SENSOR AND

GROUND?

REPLACE

DIODE LOGIC BOARD

ARE 80 - 120 VOLTS

PRESENT ACROSS

THE RED AND WHITE

WIRES OF THE

REDUNDANT COIL?

REPLACE DIODE

LOGIC BOARD

YES YES YES

22 M411433

CAN YOU

HEAR THE

REDUNDANT

COIL

OPEN?

REPLACE COMPLETE GAS VALVE

ARE 40 - 60 VOLTS

PRESENT ACROSS

THE PURPLE WIRES

TO THE

MAIN COIL?

REPLACE DIODE

LOGIC BOARD

CAN YOU HEAR THE MAIN COIL

CLICK

OPEN?

REPLACE MAIN COIL

IS GAP BETWEEN

YES

AND BURNER

1/8 IN. TO 1/4 IN.?

IGNITER GAP TO

1/8 IN. TO 1/4 IN.

IGNITER

ADJUST

Page 23

Section 3 Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

23. IGNITER DOES NOT SPARK (White Rodgers Instant Electronic Ignition)

W002

IGNITER

SPARKING

YES

GREEN WIRE

FROM

IEI CONTROL

CONNECTED TO

GROUND

TERMINAL?

YES

GAS SHUT-OFF

VALVE

OPEN?

IEI CONTROL IN

SAFETY LOCKOUT

RESET BY OPENING

AND CLOSING DOOR

YES

OPEN AND

CLOSE DOOR

CONNECT

GREEN WIRE TO

GROUND TERMINAL

OPEN GAS

SHUT-OFF

VAL VE

RESISTANCE OF

HIGH VOLTAGE LEAD

GREATER THAN 25,000

OHMS OR LESS THAN

5,000 OHMS

YES YES

REPLACE

HIGH VOLTAGE

LEAD

IGNITER GAP IS

NOT 5/32 IN.

(.397 CM)

OR CERAMIC

CRACKED

RE-GAP OR

REPLACE

IGNITER

REPLACE

IEI

CONTROL

YES

120 VOLTS PRESENT ON BLACK WIRE

FROM

IEI CONTROL

YES

CHECK GAS

VALVE COILS

REPLACE

AS REQUIRED

M411433 23

REPLACE

IEI

CONTROL

Page 24

Section 4

Grounding

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

WARNING

To reduce the risk of fire and electric shock, check with a qualified serviceperson for proper grounding procedures. Improper connection of the equipment grounding conductor may result in a risk of electric shock.

W002

W068R1

WARNING

To reduce the risk of fire and electric shock, if electrical supply is coming from a three phase service, DO NOT connect a “High Leg” or “Stinger Leg” to a single phase machine. On a three phase machine, if there is a “High Leg” or “Stinger Leg” it should be connected to L3.

Grounding Instructions

Tumbler must be grounded. In the event of malfunction or breakdown, grounding will reduce the risk of electric shock by providing the path of least resistance for electric current. Tumbler must be connected to a grounded metal, permanent wiring system; or an equipment grounding conductor must be run with the circuit conductors and connected to the appropriate ground location.

NOTE: To ensure protection against shock, tumbler MUST be electrically grounded in accordance with local codes, or in the absence of local codes, with the latest edition of the National Electrical Code ANSI/NFPA No. 70. In Canada, the electrical connections are to be made in accordance with CSA C22.1 or the latest edition of the Canadian Electrical Code, Part I and/or local codes. Electrical work should be done by a qualified electrician.

WARNING

All electrical connections should be made by a qualified electrician.

To reduce the risk of electrical shock, deenergize the electrical circuit being connected to the tumbler before making any electrical connections. Never attempt to connect a live circuit.

W070

W069

M411433 25

Page 25

Section 5

Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

IMPORTANT: References made to the left or right hand direction are taken from the operator’s position facing the front of the tumbler.

24. CONTROL PANEL

Refer to Figure 1. a. Unlock and open access panel. To hold panel

open, swing support rod under panel.

b. Manual Timer and Coin Meter Models

(1) Remove two screws holding control panel

to cabinet.

(2) Lift control panel off top edge of front

panel and pull panel forward just far enough to disconnect wire harness at the plug.

25. PUSH-TO-START SWITCH

a. Remove control panel. b. Remove two screws holding switch, and

mounting bracket (if applicable), to control panel. Refer to Figure 1.

c. Disconnect wires from switch terminals and

remove switch.

NOTE: Refer to wiring diagram when rewiring switch.

26. COOLING, DRYING, OR RUN LIGHT

a. Remove control panel. b. Disconnect light wire leads.

NOTE: On Coin Meter Models, the run light white lead must be joined to the wire harness white lead using a double spade connector. Remove the single spade lug from the replacement run light white wire.

c. Compress locking tabs on sides of light and

push light out through front of control panel Refer to Figure 2 for Coin Drop Models or Figure 3 for Manual Timer Models.

NOTE: Refer to wiring diagram when rewiring light.

M411433 27

Page 26

Section 5 Service Procedures

ACCESS

PANEL

ATTACHING SCREWS

SUPPORT

ROD

CONTROL PANEL

PUSH-TO-START

SWITCH

TERMINAL

BOARD

SCREWS

T056SE3D

WIRE HARNESS

PLUG

T057SE3A

CONTROL PANEL

BRACKETS

PUSH-TO-START

SWITCH ASSEMBLY

CONTROL

PANEL BRACKET

Figure 1

28 M411433

Page 27

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

27. RELAY (MANUAL TIMERS MODELS)

a. Remove control panel.

COIN DROP

MODEL

TAB

b. Remove two screws holding relay to mounting

bracket. Refer to Figure 3.

c. Disconnect wires from relay.

NOTE: Refer to wiring diagram when rewiring relay.

28. RESISTOR 208 or 240 Volt/60 Hertz (Models with Control Circuit)

a. Remove control panel. b. Disconnect resistor leads. Refer to Figure 3.

W002

RUN LIGHT

LOCKING

TAB

CONTROL

Figure 2

PANEL

T005SE1C

NOTE: Refer to wiring diagram when rewiring resistor.

29. COOLING OR DRYING TIMER (New Style)

a. Remove control panel. b. Pull timer knob off timer shaft. Refer to

Figure 3.

c. Remove three screws holding timer to control

panel or mounting bracket.

d. Remove wires from timer terminal board, and

timer motor lead from terminal block.

IMPORTANT: Be sure barrier is installed in proper position when reinstalling drying timer. Refer to Figure 3.

NOTE: Refer to wiring diagram when rewiring timer.

M411433 29

Page 28

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

MANUAL TIMER

MODELS

TIMER

DRYING

LIGHT

W002

LOCKING

TA BS

COOLING

LIGHT

TIMER

KNOB

30. COOLING OR DRYING TIMER MOTOR (Old Style Timers)

NOTE: Cooling and drying timers used prior to January 1985 were supplied by Greenwald and have serviceable timer motors. After January 1985, Robert Shaw or Mallory timers are used, which do not have serviceable timer motors. These later timers must be replaced as complete assemblies if the timer motor fails.

a. Remove control panel. b. Disconnect motor leads.

RESISTORS

RELAY

MOUNTING

BRACKET

T341S

Figure 3

c. Remove screws holding timer motor to

mounting bracket, Figure 4.

NOTE: Refer to wiring diagram when rewiring timer motor.

d. Replacing Greenwald timer assembly with

Mallory timer assembly:

(1) Remove Greenwald timer assembly. (2) Connect timer terminal wire 3 to terminal

board terminal B.

(3) Connect timer terminal 5 wire to terminal

board terminal C.

30 M411433

Page 29

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

HEAT

SWITCH

SCREW

TIMER

MOTOR

W002

RUN

SWITCH

TIMER

ASSEMBLY

TU001-SV

Figure 4

31. COIN METER

Refer to Figure 5. a. Remove control panel.

b. Disconnect wires from heat and run switches. c. Cut remaining motor wire and joining white

wire at wire nut.

d. Remove four speed nuts holding coin meter to

coin meter frame.

NOTE: Refer to wiring diagram when rewiring coin meter. Connect wires cut in step “c” above with new wire nut.

TIMER

MOTOR

Figure 5

SPEED

NUT

COIN

METER

TU060-SV

M411433 31

Page 30

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

32. COIN METER TIMER MOTOR

a. Remove control panel. b. Remove two screws holding motor to mounting

bracket. Refer to Figure 6.

c. Hold cam and drive fork against inside face of

motor mounting bracket and pull timer motor

free of cam and drive fork. d. Disconnect motor leads. e. Slide cam and drive fork out from under motor

mounting bracket.

NOTE: Refer to wiring diagram when rewiring timer motor.

MOTOR

MOUNTING

BRACKET

SCREW

remove the switches and actuating bracket parts.

d. Assemble the two switches and the two parts

making up the switch actuating bracket.

e. Actuate the switches a number of times by

manually pressing the actuating plate against the switch lever and plunger to ensure that the actuating parts do not bind. If binding occurs, reposition the actuating plate slightly until the binding stops.

NOTE: Refer to wiring diagram when rewiring switches.

TIMER

SWITCH

ACTUATOR

BRACKET

CAM AND

DRIVE FORK

T007SE1B

TIMER

MOTOR

Figure 6

33. COIN METER RUN OR HEAT SWITCH

Refer to Figure 7.

RUN

SWITCH

HEAT

SWITCH

T008SE1B

a. Remove control panel. b. Disconnect wires from switches on timer.

Figure 7

c. Hold switches and actuating bracket under

switches tightly together with one hand while

removing two screws holding switches to

timing motor mounting bracket. Carefully

32 M411433

Page 31

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

34. ELECTRONIC CONTROL (MM Models)

a. Unlock and open access panel. b. Remove retaining screw and swing electronic

control out from control area. Refer to Figure 8. c. Disconnect battery plug from control plug. d. Carefully remove the wire harness wires from

the back of the electronic control. e. Remove the four mounting screws holding the

electronic control to the bracket. Refer to

Figure 3.

NOTE: Refer to the wiring diagram when reconnecting the wire harness to the electronic control.

IMPORTANT: Due to the sensitivity of the electronic control, careful handling is required. As a precautionary measure, we recommend using a ground wrist strap when handling the electronic control. Wrist strap, cord and alligator clip are designed to carry away any electrostatic charge from your body and to direct charge to an available ground. By using this static protection device, potential electrostatic discharge problems associated with handling of electronic control will be minimized. Always handle electronic control by its metal edges. If a wrist strap is not available, touch tumbler while it is plugged in before handling control to dissipate any charge.

35. REVERSING/NONREVERSING SWITCH

Refer to Figure 8. a. Unlock and open access panel.

b. Remove retaining screw and swing electronic

control out from control area.

c. Disconnect the wires from the back of the

switch.

d. Remove nut holding switch to electronic

control bracket. For OM Models, depress locking tabs on rectangular switch.

36. BATTERY (MM Model) (Electronic Control Models)

Refer to Figure 8. a. Unlock and open access panel.

b. Remove retaining screw and swing electronic

control out from control area. c. Disconnect battery plug from control plug. d. Unsnap plastic clamp holding battery to control

bracket.

M411433 33

Page 32

Section 5 Service Procedures

ELECTRONIC

CONTROL BRACKET

ELECTRONIC

CONTROL

RETAINING

SCREW

MOUNTING

SCREWS

NUT

REVERSING/

NON REVERSING

SWITCH

(4)

Figure 8

BATTERY

PLUG

BATTERY

PLASTIC

CLAMP

WIRE

HARNESS

CONTROL

PLUG

T094SE3C

ELECTRONIC

CONTROL BRACKET

SWITCH

(Reversing)

SWITCH PLATE

(Reversing)

CONTROL

PLUG

T332PE3C

Figure 9

34 M411433

Page 33

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

37. CONTROL THERMOSTAT

a. Remove control panel. b. Pull off thermostat knob. Refer to Figure 10. c. Disconnect wires from thermostat. d. Remove two screws holding thermostat to

bracket.

THERMOSTAT

KNOB

SCREWS

Figure 10

SENSING

TUBE

BRACKET

j. Carefully remove thermostat, tube and probe.

IMPORTANT: Do not kink sensing tube when installing thermostat.

NOTE: Refer to wiring diagram when rewiring thermostat.

JUNCTION

BOX

WIRE

TIES

T012SE1B

e. Remove wire-way attaching screws. Refer to

Figure 11.

f. Remove screws, wire clips and/or retaining

straps securing thermostat sensing tube in wire-

WIRE

WAY

way.

g. Remove junction box cover attaching screws.

Refer to Figure 11.

IMPORTANT: When reinstalling thermostat, be sure to install all screws and wire clips and replace all retaining straps removed in step “f” and “g”.

h. Unlock and remove lint panel.

i. Spread locking tabs on sensing probe bracket

TU013-SV

and disengage probe from bracket. Refer to Figure 12.

THERMOSTAT

IMPORTANT: When reinstalling thermostat, be

SENSING TUBE

sure to secure sensing probe with locking tabs on bracket.

M411433 35

Figure 11

Page 34

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

SENSING

PROBE

LOCKING

TABS

SENSING PROBE

Figure 12

THERMOSTAT

LINT

SCREEN

THERMOSTAT

SENSING TUBE

WARNING

T014SE3A

36 M411433

Page 35

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

38. THERMISTOR (Electronic Control Models Only)

Refer to Figure 13. a. Unlock and remove the lint panel.

b. Remove the two screws holding the perforated

cover to the thermistor bracket.

c. Disconnect the wires from the back of the

thermistor.

THERMISTOR

d. Remove the two screws holding the thermistor

to the bracket. OM Models: Unthread thermistor from bracket.

NOTE: Refer to the wiring diagram when reconnecting the wires to the thermistor.

OM Models

THERMISTOR

WIRES

T345P

SCREW

LINT

PANEL

PERFORATED

COVER

T093SE3C

Figure 13

M411433 37

Page 36

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

39. GAS VALVE (White Rodgers Glow-Bar Models)

Refer to Figure 15. a. Remove control panel.

b. Close gas shut-off valve. Refer to Figure 14. c. Disconnect all wires from gas valve terminals

and disconnect gas valve pipe unions.

d. Remove screws holding gas valve and bracket

to stove assembly.

e. Remove gas valve from mounting bracket.

f. Remove spudholder and nipple from left side of

valve. Use 1/2 inch Allen wrench to remove plug from right side of valve.

IMPORTANT: Purge air from the gas service line by operating tumbler in drying mode. Use pipe compound resistant to action of L.P. gas on all pipe threads.

WARNING

To reduce risk of fire or explosion, check pipe connections for gas leaks with a noncorrosive leak detection fluid. Do not use an open flame to check for gas leaks!

W310

NOTE: Refer to wiring diagram when rewiring gas valve.

40. DIODE LOGIC BOARD (White Rodgers Glow-Bar Models)

a. Remove control panel. b. Disconnect wires from diode logic board

terminals. Refer to Figure 14.

NOTE: Refer to wiring diagram when rewiring diode logic board.

c. Compress tabs on back ends of diode logic

board standoffs and push standoffs through holes in cabinet wall to free the diode logic board.

41. MAIN COIL (White Rodgers Glow-Bar Models)

Refer to Figure 15.

NOTE: The redundant coil cannot be purchased separately. Replace the complete gas valve.

a. Remove control panel. b. Close gas shut-off valve. Refer to Figure 14. c. Disconnect wires from main coil terminals. d. Remove screws holding main coil to gas valve.

NOTE: Refer to wiring diagram when rewiring gas valve main coils.

42. IGNITER BRACKET (White Rodgers Glow-bar Models)

Refer to Figure 14. a. Remove control panel.

b. Insert tips of 90 degree Tru-Arc pliers into

holes in each igniter mounting clip and spread clips just far enough for igniter removal.

IMPORTANT: Use extreme care when handling the igniter as it is very fragile. Handle igniter by grasping the white wings only. Do not handle the silicon carbide portion of the igniter with hands or allow any oil, grease, or other foreign material to contaminate it. Hairline cracks, oil, grease, or other impurities will cause igniter to burn out.

c. Remove screw holding igniter bracket to stove

assembly.

d. Disconnect igniter wires from diode logic

board.

38 M411433

Page 37

STAND-OFFS

GLOWBAR

IGNITER

SENSOR

IGNITER

BRACKET

SPUD HOLDER

GAS

SHUT-OFF

VALV E

UNION

NUTS

NIPPLE

VALV E

White Rodgers Glow-Bar Ignition Burner

WHITE RODGERS

GLOW-BAR IGNITION BURNER

GAS

DIODE

LOGIC

BOARD

GAS

OFF

PLUG

GAS

T019SE1A

Section 5 Service Procedures

MANIFOLD

IGNITOR

NIPPLE

UNION

NUT

GAS

VALV E

HIGH VOLTAGE

LEAD

T021SE1B

GAS

WHITE RODGERS

INSTANT ELECTRONIC IGNITION BURNER

GAS

OFF

GAS

SHUT-OFF

VALV E

MAIN

COIL

REDUNDANT

COIL

WHITE RODGERS

White Rodgers Glow-Bar

GLOW-BAR GAS VALVE

GAS

VALV E

BODY

Figure 14

MAIN

COIL

GAS

VALV E

BODY

REDUNDANT

COIL

White Rodgers

Instant Electronic System (IEI)

INSTANT ELECTRONIC IGNITION GAS VALVE

WHITE RODGERS

T002SE3D

Figure 15

M411433 39

Page 38

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

43. SENSOR (White Rodgers Glow-Bar Models)

Refer to Figure 14. a. Remove control panel.

b. Disconnect wires from sensor, (on left side of

burner housing).

c. Remove screw holding sensor to side of stove

assembly.

NOTE: Refer to wiring diagram when rewiring flame sensor.

44. IGNITER (Instant Electronic Ignition Models)

Refer to Figure 14. a. Remove control panel.

b. Disconnect high voltage lead from igniter. c. Remove two screws attaching igniter bracket to

stove assembly.

45. IGNITION CONTROL (Instant Electronic Ignition Models)

Refer to Figure 14. a. Remove control panel.

b. Disconnect wire harness. c. Remove high voltage lead.

46. GAS VALVE (Instant Electronic Ignition Models)

Refer to Figure 15. a. Remove control panel.

b. Close gas shut-off valve. Refer to Figure 14. c. Disconnect all wires from gas valve terminals

and disconnect gas valve pipe unions.

d. Remove screw holding gas valve bracket to

stove.

e. Remove spudholder and manifold from left

side of valve and plug from right side of valve.

f. Remove gas valve from mounting bracket.

IMPORTANT: Purge air from the gas service line by operating tumbler in drying mode. Use pipe compound resistant to action of L.P. Gas on all pipe threads.

WARNING

To reduce risk of fire or explosion, check pipe connections for gas leaks with a noncorrosive leak detection fluid. Do not use an open flame to check for gas leaks!

W310

IMPORTANT: Remove circuit board and plastic back as a unit. Handle ignition control unit by sides of board only. Do not contact circuit boards with hands or metal objects. Place unit in clean, dry area away from work area to avoid damage. Do not attempt field repair of the ignition control unit. Attempted repair or tampering with the ignition control unit will void its warranty.

d. Remove two screws attaching ignition control

unit to cabinet frame.

e. Remove ignition control unit.

40 M411433

Page 39

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

47. MAIN COIL (Instant Electronic Ignition Models)

Refer to Figure 15.

NOTE: The redundant coil cannot be purchased separately. Replace complete gas valve.

a. Remove control panel. b. Close gas shut-off valve. Refer to Figure 14. c. Disconnect wires from main coil terminals. d. Remove screws holding main coil to gas valve.

48. BURNER TUBE

a. Remove control panel. b. Close gas shut-off valve. Refer to Figure 14. c. Disconnect union nuts attaching nipple to

spudholder and remove spudholder.

d. Remove screws holding gas and valve bracket

to stove assembly.

e. Remove screws holding burner tubes to stove

frame and remove burner tubes.

WARNING

b. Remove wires from contactor terminals and

terminal blocks.

NOTE: Refer to wiring diagram when rewiring contactors or terminal blocks.

c. Remove screws attaching contactor to box. d. Remove two screws holding terminal block to

box.

NOTE: Terminal block consists of two terminal section (one phase) or three terminal sections (three phase) and an end piece snapped together. Later models use a one-piece three position terminal block mounted on a din rail.

TERMINAL

CONTACTOR

BLOCKS

CONTACTOR

To reduce risk of fire or explosion, check pipe connections for gas leaks with a noncorrosive leak detection fluid. Do not use an open flame to check for gas leaks!

W310

IMPORTANT: Make sure that spudholder and orifices are positioned such that gas will be injected directly down the center of the burner.

Figure 16

T182SE1A

49. CONTACTORS AND TERMINAL BLOCK (Electric Models)

Refer to Figure 16.

NOTE: Contactors and terminal blocks are located in contactor box at the rear of the tumbler.

a. Remove screw holding cover to contactor box

and remove cover.

M411433 41

Page 40

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

50. HEATER ELEMENT (Electric Tumbler)

Refer to Figure 17. a. Remove two screws holding wire hood to top of

cabinet and remove.

b. Remove nuts, wires and bus bars from element

terminals.

c. Remove four screws holding heater housing to

top of cabinet and remove heater from tumbler.

d. Turn heater housing upside down and remove

bottom guard retaining screws.

e. Remove two retaining screws from each of the

elements to be replaced.

W002

NOTE: To remove top element, all elements must be removed. To remove center element, both center and bottom element must be removed.

f. Slide element forward until terminals clear rear

of heater housing.

g. Tilt element up and gently slide it out of

housing.

IMPORTANT: Bottom guard must be put back on bottom of housing before reinstalling heater on tumbler.

42 M411433

Page 41

Older Models:

BOTTOM GUARD

ATTACHING SCREW

SCREW

HIGH LIMIT

THERMOSTAT

Section 5 Service Procedures

HEATER

HOUSING

WIRES

NUT

BOTTOM

GUARD

BUS BAR

Newer Models:

JUMPER

WIRES

BUS BAR

NUT

HEATER

HOUSING

HEATER

ELEMENT

T231PE3D

SCREW

HIGH LIMIT

THERMOSTAT

HEATER

ELEMENT

T422PE3A

Figure 17

M411433 43

Page 42

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

51. STOVE HIGH LIMIT THERMOSTAT (Gas Models)

NOTE: Steps “a” through “d”, and “f” apply only to energy saver models. The stove high limit thermostat is more readily accessible on non-energy saver models.

a. Remove control panel. b. Remove screw holding cover to junction box or

airflow switch. Remove cover. Refer to Figure 18.

c. Disconnect stove high limit thermostat wires in

junction box.

d. Remove conduit nut from BX on inside of

junction box. Refer to Figure 18.

e. Remove two screws holding thermostat and

bracket to rear side of burner. Refer to Figure 18.

NOTE: This will allow the conduit to follow through between burner and cabinet when thermostat and bracket assembly are slid toward front of tumbler (energy saver models only).

f. Carefully slide assembly, with conduit, toward

front of tumbler far enough to permit removal of complete assembly from burner.

g. Remove two screws holding cover to mounting

bracket. Refer to Figure 19.

h. Disconnect wires from thermostat.

i. Remove two screws holding thermostat to

mounting bracket. Refer to Figure 19.

JUNCTION

BOX

SCREWS

CONDUIT

NUT

SCREWS

Figure 18

COVER

STOVE

HIGH LIMIT

THERMOSTAT

T025SE1B

STOVE

HIGH LIMIT

THERMOSTAT

MOUNTING

BRACKET

SCREWS

TU026-SV

Figure 19

44 M411433

Page 43

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

52. CABINET HIGH LIMIT THERMOSTAT Energy Saver Gas Models

(Located on side of Vertical Exhaust Duct) Refer to Figure 20.

a. Support drive guard and remove screws

holding guard to rear of tumbler, Figure 28. b. Disconnect wires from thermostat. c. Remove two screws holding thermostat to

vertical duct.

Non-Energy Saver Gas Models

(Located under Cylinder) Refer to Figure 20.

a. Remove lint compartment door. b. Remove two screws holding thermostat

mounting bracket to cylinder shroud.

c. Remove two screws holding cover to mounting

bracket. d. Disconnect two wires from thermostat. e. Remove two screws attaching thermostat to

mounting bracket.

NOTE: Refer to wiring diagram when reconnecting thermostat wires.

CABINET

HIGH LIMIT

THERMOSTAT

COVER

MOUNTING

BRACKET

Figure 20

M411433 45

TU076-SV

Page 44

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

53. HIGH LIMIT THERMOSTAT (Electric Models)

a. Unlock and open access door. b. Disconnect wires from thermostat. c. Remove two screws holding thermostat to front

of heater housing and remove thermostat. Refer to Figure 17.

NOTE: Refer to wiring diagram when rewiring thermostat.

54. STEAM COILS

WARNING

Allow steam coils and valve to cool down before attempting any service procedures.

W249

a. Shut off inlet and outlet valves and disconnect

flex hoses from steam coils

b. Remove screws holding cover to top of steam

heating unit and remove cover.

c. Remove screws holding steam coils to coil

frame.

d. Remove steam coils by lifting straight up and

out of tumbler.

IMPORTANT: When removing or replacing steam coils, be careful not to damage fins on steam coils.

46 M411433

Page 45

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

55. LOADING DOOR ASSEMBLY

Refer to Figure 21. a. Open loading door.

b. While supporting door, remove upper hinge

bolt holding door to hinge bracket.

c. Remove door from hinge bracket.

NOTE: Nylon washer must be in place on lower pin when reinstalling loading door.

DOOR

ASSEMBLY

HINGE

BOLT

HINGE

BRACKET

56. LOADING DOOR HINGE

a. Open loading door. b. While supporting door, remove upper hinge

bolt holding door to hinge bracket. Refer to

Figure 21. c. Remove door from hinge bracket. d. Remove nuts and screws holding hinge to door

frame. Refer to Figure 22.

DOOR HINGE

HINGE

ATTACHING

SCREWS

T028SE1A

Figure 21

T029SE1A

Figure 22

M411433 47

Page 46

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

57. LOADING DOOR HANDLE

Refer to Figure 23. a. Open loading door.

b. Remove screws holding door handle to door

frame.

W002

SCREWS

DOOR

HANDLE STYLE

DOOR

HANDLE

TU030-SV TU031-SV

BAR

ATTACHING

SCREW

DOOR

BAR STYLE

BAR

ATTACHING

SCREW

DOOR

BAR

Figure 23

48 M411433

Page 47

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

58. FRONT PANEL

a. Remove control panel. b. Unlock, open and remove lint panel. Set aside

to prevent damage.

c. Open loading door, support door and remove

upper hinge bolt holding door to hinge bracket. Refer to Figure 21.

NOTE: Nylon washer must be in place on lower hinge pin when reinstalling door.

FRONT PANEL

ATTACHING SCREWS

(13)

W002

d. Remove door from bracket. e. Support front panel and remove screws (and

three speed nuts) holding front panel to tumbler cabinet. Refer to Figure 24.

NOTE: When removing front panel, lower panel slightly to make sure door switch rod clears hole in cabinet.

T032SE1D

SPEED

NUTS

Figure 24

M411433 49

Page 48

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

59. LOADING DOOR SWITCH

a. Remove control panel. b. Disconnect wires from door switch. c. Remove two switch attaching screws and

remove switch. Refer to Figure 25.

NOTE: Refer to wiring diagram when rewiring door switch.

DOOR

SWITCH

SCREWS

60. LOADING DOOR SWITCH ROD

a. Remove control panel. b. Unlock, open and remove lint panel. Set aside

to prevent damage. c. Open loading door, support door and remove

upper hinge bolt holding door to hinge bracket,

Figure 21.

NOTE: Nylon washer must be in place on lower hinge pin when reinstalling door.

d. Remove door from bracket. e. Support front panel and remove screws (and

three speed nuts) holding front panel to tumbler

cabinet. Refer to Figure 24.

f. Remove nut, washers and spring clip holding

switch rod to backside of front panel. g. Apply upward pressure on the welded clip to

allow switch rod snap free. Refer to Figure 26.

T034SE1C

Figure 25

DOOR

SWITCH

ROD

SPRING

CLIP

T036SE1B

Figure 26

50 M411433

Page 49

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

61. AIRFLOW SWITCH ASSEMBLY

Refer to Figure 27.

NOTE: Depending on the model, the airflow switch will be found either on the rear of the stove assembly or, directly below the wire-way on the rear of the tumbler.

a. Remove airflow switch box cover. Refer to

Figure 28.

b. Disconnect wires from airflow switch.

NOTE: Refer to wiring diagram when rewiring airflow switch.

WIRE-WAY

COVER

W002

c. Remove screw(s) holding airflow switch and

mounting bracket to switch box.

d. Remove two screws holding airflow switch to

mounting bracket.

NOTE: After reinstalling airflow switch and mounting bracket into switch box, adjust airflow switch. Refer to Paragraph 80.

INSULATOR

SWITCH

BOX

SWITCH

LEVER

MOUNTING

BRACKET

MOUNTING

SCREWS

DRIVE

GUARD

DRIVE

GUARD

ATTACHING

SCREW

AIRFLOW

SWITCH

BOX COVER

Figure 28

62. WIRE-WAY COVER

Refer to Figure 28. a. Remove six screws holding wire-way cover to

rear of tumbler. b. Remove wire-way cover.

TU072-SV

IMPORTANT: When reinstalling cover, make sure the wires and thermostat sensing tube (if equipped)

T037SE1B

Figure 27

M411433 51

are not pinched between rear of cabinet and wire cover or between cover plate and channel.

Page 50

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

63. DRIVE GUARD

Refer to Figure 28. a. Support drive guard and remove screws

holding guard to rear of tumbler.

b. Reinstall drive guard.

64. DRIVE BELT Nonreversing Tumblers

Refer to Figure 30. a. Support drive guard and remove screws

holding guard to rear of tumbler. Refer to Figure 28.

b. Remove two screws holding belt guard

assembly to motor bracket. Remove belt guard.

Refer to Figure 29. c. Remove chain. Refer to Paragraph 65. d. Loosen nut on idler housing attaching bolt.

Drop idler housing to bottom of slots. e. Remove lower bolt and nut from guide rail.

Hinge guide rail out and slip belt out from

under guide rails.

f. Slip new belt under guide rail and onto sheave,

and motor pulley.

f. Slip drive belt off sheave, and remove drive belt

by working it over the top of the guide rails.

g. Slip new belt onto sheave and motor pulley.

Adjust belt tension. Refer to Adjustments Section.

NOTE: After reinstalling belt and chain, adjust belt, then adjust chain. Refer to Adjustments Section.

Reversing Tumblers

SCREWS

Figure 29

BELT

GUARD

TU039-SV

Refer to Figure 31. a. Support chain guard and remove screws

holding guard to rear of tumbler. Refer to

Figure 28. b. Disconnect electrical service to the tumbler. c. Support chain guard and remove the screws

holding it to the back panel of the tumbler.

Leave the belt guard attached to the top of the

drive guard. d. Loosen four capscrews holding motor

mounting bracket to side brackets. Lower

motor and mounting bracket until holding

capscrews bottom in the mounting slots. e. Slip drive belt off motor pulley.

52 M411433

Page 51

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

65. DRIVE CHAIN Nonreversing Tumblers

a. Support drive guard and remove screws

holding guard to rear of tumbler. Refer to Figure 28.

b. Loosen jam nut on idler sprocket locking bolt

and move sprocket to the right to relieve chain tension. Refer to Figure 30.

c. Run chain off drive sprocket and lift chain off

cylinder sprocket.

d. Reinstall chain and drive guard.

Reversing Tumblers

a. Support drive guard and remove screws

holding guard to rear of tumbler. Refer to Figure 28.

b. Loosen nut on idler housing attaching bolt and

slide idler housing to top of slotted mounting holes in guide rails. Refer to Figure 31. This will provide slack in drive chain for removal from sprockets.

c. Adjust chain following installation.

66. IDLER HOUSING ASSEMBLY Nonreversing Tumblers

Refer to Figure 30. a. Remove drive guard.

b. Remove drive belt. c. Loosen jam nut on chain idler sprocket and

move sprocket to right. (Non-reversing tumbler

only.) d. Run chain off the drive sprocket. e. While supporting the idler housing assembly,

remove the upper and lower bolts, lock washers

and nuts holding the guide rail to the trunnion

housing and motor bracket.

f. Pull complete idler housing assembly with

guide rails away from the back of the tumbler. g. After repairing or replacing idler housing

assembly, reinstall chain, belt and drive guard.

Reversing Tumblers

a. Support drive guard and remove screws

holding guard to rear of tumbler. Refer to Figure 28.

b. Remove two screws holding belt guard

assembly to motor bracket. Refer to Figure 29.

Remove belt guard. c. Remove chain. Refer to Paragraph 65. d. Loosen nut on idler housing attaching bolt.

Refer to Figure 31. Drop idler housing

assembly to bottom of slots. e. Remove upper and lower bolts and nuts from

guide rail. Refer to Figure 31. Guide rail out

and slip belt out from under guide rails.

f. Slip new belt under guide rail and onto sheave,

and motor pulley. Refer to Figure 31.

NOTE: After reinstalling belt and chain, adjust belt, then adjust chain. Refer to Adjustments Section.

g. Support drive guard and remove screws

holding guard to rear of tumbler. Refer to

Figure 28. h. Leave the belt guard attached to the top of the

drive guard.

i. Loosen nut on idler housing attaching bolt and

slide idler housing to top of slotted mounting

holes in guide rails. Refer to Figure 31. This

will provide slack in drive chain for removal.

j. While supporting the idler housing assembly,

remove the upper and lower bolts, lockwashers

and nuts holding the guide rail to the trunnion

housing and motor bracket, Figure 31. k. Pull complete idler housing assembly with

guide rails away from the back of the tumbler.

l. After repairing or replacing idler housing

assembly, reinstall chain, belt, drive guard and

belt guard.

M411433 53

Page 52

Section 5 Service Procedures

BELT/CHAIN

NONREVERSING

MODELS

UPPER

GUIDE RAIL

BOLT AND NUT

CHAIN

CYLINDER

SPROCKET

CHAIN

TA KE -U P

SPROCKET

DRIVE

SPROCKET

IDLER

HOUSING

ATTACHING

BOLT AND

NUT

BELT

SHEAVE

IDLER RAILS

LOWER GUIDE

RAIL BOLT

AND NUT

TU202-PT

Figure 30

54 M411433

Page 53

MOTOR

BRACKET

MOUNTING

BOLTS

BELT

TRUNNION

HOUSING

ASSEMBLY

MOTOR

PULLEY

CYLINDER

MOTOR

Section 5 Service Procedures

BELT/CHAIN

REVERSING

MODELS

MOTOR

MOUNTING

BOLTS

DRIVE

CHAIN

SHEAVE

BUSHING

CYLINDER

SPROCKET

DRIVE

SPROCKET

T201PE3B

Figure 31

M411433 55

Page 54

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

67. IDLER SPROCKET Nonreversing Tumblers

Refer to Figure 32. a. Support drive guard and remove screws

holding guard to rear of tumbler. Refer to

Figure 28. b. Remove chain from idler sprocket. c. Remove jam nut and sprocket from bolt. Refer

to Figure 30. d. Reinstall chain and drive guard.

NOTE: After installing chain and sprocket, adjust chain. Refer to Adjustments Section.

68. SHEAVE

Refer to Figure 30 and/or Figure 31. a. Remove drive belt.

b. Loosen jam nut on chain idler sprocket and

move idler sprocket to the right. (Nonreversing

tumblers only). c. Run chain off drive sprocket or belt off upper

sheave. d. While supporting idler housing, remove the

upper and lower bolts, nuts, and lockwashers

holding guide rails to trunnion housing and

motor bracket. e. Remove the sheave, guide rails and idler

housing as an assembly from the rear of the

tumbler.

f. Remove snap ring from idler shaft.

(Nonreversing models only). g. Loosen two setscrews holding sheave to idler

shaft and pull sheave off idler shaft. h. Remove key from shaft keyway.

IMPORTANT: Reassemble sheave to idler shaft. On nonreversing tumblers, run sheave out until it butts against snap ring. Make sure that shaft key is correctly positioned under setscrew. Tighten setscrew above key first, then tighten other setscrew.

IMPORTANT: Reversing Tumblers — Realign motor pulley directly over sheave by loosening drive motor mounting screws and repositioning motor on mounting bracket.

69. DRIVE SPROCKET/PULLEY

Refer to Figure 32. a. Remove chain.

b. Loosen setscrews holding drive sprocket/pulley

to idler shaft and pull sprocket/pulley free. c. Remove key from shaft keyway. d. Reinstall chain and belt and drive guard.

IMPORTANT: Reassemble sprocket or pulley to idler shaft. Align with cylinder sprocket or sheave. Make sure shaft key is positioned under one of the setscrews. Tighten setscrew over key first, then tighten the other setscrew.

70. IDLER SHAFT

Refer to Figure 32. a. Remove idler housing assembly.

b. Remove sheave and drive sprocket or pulley. c. Remove bolt holding idler housing to guide

rails. d. Support idler housing assembly and carefully

drive idler shaft from housing with a hammer

and a hardwood dowel. e. Support idler housing assembly and remove

bearings from housing with a hammer and a

hardwood dowel.

f. Reinstall shaft and bearings.

IMPORTANT: When installing new bearings, apply a film of bearing retaining compound to the bearing cavity surfaces of the housing and the outside diameter of the bearings.

IMPORTANT: If a press is not available to install bearings, carefully tap bearings into housing.

IMPORTANT: Nonreversing Tumblers — Realign

g. Reinstall drive guard.

motor pulley directly under sheave by loosening drive motor mounting screws and repositioning motor on mounting bracket.

56 M411433

NOTE: After installing sheave, adjust belt, then adjust chain. Refer to Adjustments Section.

Page 55

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

71. CYLINDER SPROCKET/UPPER SHEAVE Nonreversing Tumblers

Refer to Figure 30. a. Support drive guard and remove screws

holding guard to rear of tumbler. Refer to Figure 28.

b. Loosen jam nut on idler sprocket and move

sprocket to the right to relieve chain tension.

c. Run chain off idler sprocket and drive sprocket

or run belt off upper sheave.

d. Lift chain off cylinder sprocket.

NOTE: After installing chain on drive and idler sprockets, adjust chain. Refer to Adjustments Section.

e. Remove pal nut and jam nut, and pry sprocket

from cylinder shaft.

Reversing Tumblers

Refer to Figure 31. a. Remove drive chain from cylinder sprocket or

two belts from drive.

b. Remove three attaching bolts from sprocket or

sheave hub.

c. Turn these three bolts into the threaded holes in

the hub, and “jack” the hub and sprocket apart.

d. Remove hub, sprocket or belt, key and spacer.

72. CYLINDER ASSEMBLY

a. Remove control panel. b. Open loading door. c. While supporting door, remove upper hinge

bolt holding door to hinge bracket. Refer to Figure 21.

d. Remove door from hinge bracket.

NOTE: Nylon washer must be in place on lower pin when reinstalling loading door.

e. Remove control panel.

f. Unlock, open and remove lint panel. Set aside

to prevent damage.

g. Support front panel and remove screws (and

three speed nuts) holding front panel to tumbler cabinet. Refer to Figure 24.

NOTE: When removing front panel, lower panel slightly to make sure door switch rod clears hole in cabinet.

h. Remove drive chain or belt.

i. Remove key and cylinder sprocket or sheave. j. Pull cylinder out through front of cabinet.

NOTE: When removing cylinder out through front of cabinet, spread cabinet slightly so cylinder will clear cabinet sides.

NOTE: After installing chain on drive and idler, adjust chain or belts. Refer to Adjustments Section.

NOTE: After reinstalling chain on cylinder, drive and idler sprockets, adjust chain. Refer to Adjustments Section.

NOTE: After installing cylinder and shaft, adjust cylinder clearance. Refer to Adjustments Section.

k. Reinstall drive guard on tumbler.

M411433 57

Page 56

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

LOCKWASHER

BOLT

IDLER

HOUSING

(INCLUDES

SNAP RING)

BEARING

BOLT

CARRIAGE

73. TRUNNION HOUSING ASSEMBLY

a. Remove cylinder assembly. b. Remove upper guide rail bolt and nut. c. Remove four cap screws holding trunnion

housing assembly to rear of cabinet. Refer to

Figure 30 or Figure 31. d. Remove housing from tumbler. e. Remove four bearing retainer screws holding

the small bearing in housing. Refer to

Figure 33.

f. Use a hammer and wood dowel to remove

bearings.

WASHER

NUT

IDLER

HOUSING

Figure 32

KEY

IDLER

SPROCKET

SLEEVE

IDLER

SHAFT

CONNECTING LINK

(Included with

Chain

NUT

LOCKWASHER

DRIVE

SPROCKET

DRIVE CHAIN

BEARING

TU131-PT

LARGE

BEARING

WASHER

IMPORTANT: When installing new bearings, apply a film of bearing retaining compound to the bearing cavity surfaces in the housing.

NOTE: If a press is not available to install bearings, carefully tap bearings into housing.

TRUNNION

HOUSING

SMALL

BEARING

RETAINER

SCREW

TU192-PT

g. Reinstall drive guard on tumbler. Refer to

Figure 28.

58 M411433

Figure 33

Page 57

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

74. TRUNNION SHAFT ASSEMBLY

Refer to Figure 34. a. Remove cylinder assembly.

b. Remove the four washers and nuts holding

trunnion shaft assembly to rear of cylinder.

IMPORTANT: When installing trunnion assembly on cylinder, the cylinder and shaft must be leveled. Refer to Figure 34 for an example of how to check for proper alignment of the shaft and cylinder. Measure the distance between the center of the

TAPE

MEASURE

trunnion shaft and the outer rim of the cylinder at the four points shown. If any measurement is lower than the highest point, place shim or shims (M401402) between trunnion channel and cylinder back until the measurement is equal to the highest point.

NOTE: After installing cylinder and shaft, adjust cylinder clearance. Refer to Adjustments Section.

c. Reinstall drive guard on tumbler, Figure 28.

TRUNNION

ASSEMBLY

MEASURE AT

FOUR POINTS

CYLINDER

T089SE3C

Figure 34

M411433 59

Page 58

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

75. MOTOR AND FAN ASSEMBLY

NOTE: To remove the motor and fan assembly from a nonreversing tumbler, the complete procedure (steps “a” through “o”) must be performed. On a reversing tumbler, where the motor drives only the fan, motor and fan removal can be accomplished using steps “a”, “b”, “g” and “i” through “o”.

a. Disconnect wires from motor as follows:

Older models - without quick-disconnect

wire harness.

(1) Remove cover plate from motor junction

box and disconnect wires from motor wires. Refer to Figure 35.

(2) Remove conduit nut from inside of motor

junction box. Pull wires from junction box.

Newer models - with quick-disconnect wire

harness.

(1) Remove cover plate from rear of motor. (2) Mark four wires and disconnect them from

motor terminals. (3) Loosen clamp screws in box connector. (4) While holding box, turn box connector out

of motor.

NOTE: After removing belt, replace the lower guide rail bolt, Refer to Figure 30 or Figure 31.

g. Slip drive belt off motor pulley. h. Remove the seven fan housing attaching

screws. Refer to Figure 35.

i. Remove the two capscrews and two sets of nuts

and washers holding motor bracket to rear of tumbler cabinet. Refer to Figure 35.

MOTOR

ATTACHING

BOLT

(Both sides)

NUT AND

WASHER

CAP

SCREWS

NUT AND

WASHER

NOTE: Refer to wiring diagram when rewiring motor.

b. Remove chain or upper belt. c. Loosen nut on upper guide rail bolt. Refer to

Figure 30 or Figure 31.

d. Loosen nut on idler housing attaching bolt and

lower idler housing to bottom of slots. This is to put slack in drive belt, so it can be slipped off the motor pulley without risk of damage.

FAN HOUSING

ATTACHING

SCREWS

(7)

MOTOR

JUNCTION

BOX

PLATE

Figure 35

MOTOR

ATTACHING

BOLT

(Both sides)

TU044-SV

e. Remove screws holding belt guard to motor

bracket and remove belt guard. Refer to Figure 29.

f. Loosen nut and washer from lower guide rail

bolt. Refer to Figure 30 or Figure 31.

60 M411433

Page 59

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

j. Using the guide rails as supports, swing motor

and fan assembly out and away from rear of tumbler.

k. While supporting motor and fan assembly,

remove the lower guide rail bolt.

l. Remove four sets of nuts, washers and bolts

holding mounting bracket to motor. Refer to Figure 35.

m. Remove locknut and jam nut holding fan on

motor shaft. Refer to Figure 36. Pull fan off motor shaft.

NOTE: Fan is keyed to motor shaft and may have to be removed using a puller. Look for a spacer washer at the bottom of the fan keyway. Take care to avoid losing or damaging the washer.

FAN HOUSING

SPACER

WASHER

COVER

n. Remove spacer washer from motor shaft. Refer

to Figure 36.

o. Loosen two setscrews holding motor pulley to

motor shaft. Refer to Figure 36. Remove motor pulley.

NOTE: A puller may be required to remove pulley from motor shaft.

NOTE: After installing motor and fan assembly, adjust belt, then adjust chain (nonreversing models only.) Refer to Adjustments Section.

NOTE: Belt/belt drive models have automatic upper belt tensioning.

FAN KEY

MOTOR

PULLEY

JAM NUT

MOTOR

PULLEY

FAN

LOCKNUT

KEY

T046SE3A

Figure 36

M411433 61

Page 60

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

76. CYLINDER DRIVE MOTOR (Reversing Tumblers)

a. Support drive guard and remove the screws

holding it to the back panel of the tumbler. Leave the belt guard attached to the top of the drive guard.

b. Loosen four capscrews holding motor

mounting bracket to side brackets. Lower motor and mounting bracket until holding capscrews bottom in the mounting slots.

On later models, lower adjusting bolt to lessen belt tension.

After 1996:

MOTOR

BRACKET

c. Slip drive belt off of the motor pulley. d. Disconnect the wire harness from motor. e. Remove the four capscrews, nuts, lockwashers

and flat washers holding the motor to the mounting bracket.

f. Loosen the setscrews in the motor pulley and

remove pulley by using a suitable puller.

NOTE: Refer to wiring diagram when rewiring the motor.

g. After installing motor, adjust drive belt tension,

and adjust motor position on mounting bracket.

MOTOR

PULLEY

CYLINDER

MOTOR

ADJUSTING

BOLT

T472P_

Figure 37

62 M411433

Page 61

Prior to 1996:

Section 5 Service Procedures

SIDE

BRACKET

CYLINDER

MOTOR

PULLEY

BELT

GUARD

MOTOR

MOUNTING

BRACKET

SIDE

BRACKET

TU142-PT

Figure 38

M411433 63

Page 62

Section 5 Service Procedures

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

77. REVERSING CONTROL ELECTRICAL COMPONENTS

Refer to Figure 39.

NOTE: All electrical components except the reversing/nonreversing switch are located in the reversing control box on the rear of the tumbler. The reversing/nonreversing switch is mounted on the upper right hand corner of the control panel on part of OM microprocessor.

a. Reversing/nonreversing switch:

(1) Remove control panel. (2) Disconnect wires from switch terminals.

NOTE: Refer to wiring diagram when rewiring switch.

(3) Remove nut holding switch to front of

control panel or release rectangular switch retainers.

(4) Remove and save hex nut from switch

shaft. Nut is furnished with the switch.

b. Reversing timer assembly:

(1) Remove two attaching screws and cover

from control box.

(2) Disconnect wires from timer motor and

switches.

NOTE: Refer to wiring diagram when rewiring timer motor and switches.

(3) Remove two screws holding timer to back

wall of control box.

(4) Remove timer motor and/or switches as

necessary for replacement. If timer itself is faulty, replace the complete assembly, including timer motor and switches. Electronic reverser has no motor or switches.

c. Reversing contactor:

(1) Remove two attaching screws and cover

from control box.

(2) Disconnect wires from contactor coil

terminals.

NOTE: Refer to wiring diagram when rewiring reversing contactor.

(3) Remove screws holding contactor to back

wall of control box.

(4) To remove coils for replacement, remove

single screw holding each coil to contactor frame.

(5) If contactor problem is something other

than a defective coil, replace complete contactor assembly.

d. Fan motor contactor:

(1) Remove junction box cover. Refer to

Figure 18.

(2) Disconnect wires from contactor terminals.

NOTE: Refer to wiring diagram when rewiring fan motor contactor.

(3) Remove two screws holding fan motor

contactor to back wall of junction box.

e. Transformers (480 Volt electrical system

only):

(1) Remove two attaching screws and cover

from reversing control box.

(2) Disconnect leads from transformer

terminals.

NOTE: Refer to wiring diagram when rewiring transformer.

(3) Remove four screws holding transformer

to back wall of reversing control box. Refer to Figure 39.

NOTE: OM microprocessor doesn’t have a mechanical or electronic reversing timer.

64 M411433

Page 63

Section 5 Service Procedures

REVERSING

TIMER

ASSEMBLY

TIMER

MOTOR

SWITCH

CONTROL

BOX

COVER

SCREW

TRANSFORMER

(480 Volt only)

REVERSING

CONTACTORS

GROUND

SCREW

GROUND

LUG

COIL

(240 Volt)

SCREW

FAN

CONTACTOR

TU140-PT

Figure 39

M411433 65

Page 64

Section 6

Adjustments

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

78. LEVELING LEGS

NOTE: It is recommended that the front of the tumbler be kept slightly higher than the rear (approximately 1/8 inch, 3.0 mm). This will prevent the clothes, while tumbling, from wearing on the door glass gasket.

a. Check the front to rear level by rotating the

clothes cylinder until one of the cylinder ribs is at the bottom. Place a level on the rib.

b. Check the side to side level by placing a level

on the front and rear of top panel.

c. Front leg adjustment fittings are accessed by

removing lint panel door. Rear adjustment fittings are located on rear corner braces. Adjust legs as needed.

T451I_

W002

NOTE: Keep the tumbler as close to the floor as possible. All four legs must rest firmly on the floor so weight of tumbler is evenly distributed. Tumbler must not rock.

d. Replace lint panel.

Figure 40

M411433 67

Page 65

Section 6 Adjustments

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

79. MAIN GAS BURNER AIR INLET SHUTTERS

PROPER AIRFLOW

(All Gas Models)

Refer to Figure 41.

CAUTION

The air inlet shutters on the burner must be adjusted so sufficient primary air is metered into the system for proper combustion and maximum efficiency. Before adjusting the inlet shutter be sure that all lint is removed from lint compartment and lint screen.

W281

INSUFFICIENT AIRFLOW

Air inlet shutter adjustments will vary from location to location and will depend on the vent system, number of units installed, make-up air and line gas pressure. Opening the shutter increases the amount of primary air supplied to the burner while closing the shutter decreases the air supply. Adjust air shutter as follows:

AIR SHUTTER

ADJUSTING SCREWS

W002

a. Unlock and open the access door. b. Start the tumbler and check the flame pattern.

Correct air and gas mixture is indicated if the flame pattern is primarily blue, with small

AIR SHUTTER

ADJUSTING SCREWS

yellow tips. Too little air is indicated if the flame is yellow, lazy and smokey.

c. To adjust the air inlet shutter, loosen locking

NO AIRFLOW

screw. Control panel may have to be removed temporarily to loosen locking screw.

d. Adjust shutter as necessary to obtain desired

flame intensity.

e. After shutter is adjusted, tighten locking screw

securely.

f. If the shutter is correctly adjusted, but the flame

pattern is straight up, insufficient air is flowing through the tumbler and airflow switch is improperly set. A flame pattern that flares to the right and left, indicates that no air is flowing through the tumbler.

68 M411433

AIR SHUTTER

ADJUSTING SCREWS

Figure 41

TU019-KT

Page 66

Section 6 Adjustments

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

80. AIRFLOW SWITCH

Refer to Figure 42.

WARNING

Control panel, access panel, and lint panel must be in place before attempting to adjust airflow switch.

W276

IMPORTANT: Airflow switch disc must remain closed during operation. If it opens during the drying cycle, insufficient airflow through the tumbler is indicated. If switch remains open, or pops open and closed during the cycle, the heating system will shut off. The cylinder and fan will continue to operate even though the airflow switch is malfunctioning.

WARNING

Airflow switch operation may be affected by a clogged lint screen, lack of make-up air, or by obstructions in the vertical recirculation stack, or in the customer installed main or collector ducts. These conditions MUST be checked and necessary corrections made before adjusting airflow switch. Always check airflow at installation. Under no circumstances is the airflow switch to be blocked closed or bypassed.

W277

a. Load the tumbler with a 75 pound dry cotton

load.

NOTE: Airflow adjustment is much faster with one person opening lint panel in front and another adjusting the counterweight in the rear of tumbler.

b. Start the tumbler. Open the lint panel 1-1/2

inches (38.1 mm). The airflow disc should move away from the cabinet, opening the switch contacts and shutting off the heat system. This indicates proper operation and proper adjustment.

c. If switch is not opening as described in step “b”,

it should be adjusted so it is MORE sensitive. Depress the spring clip and move counterweight a small amount toward disc. Retest by opening lint panel and continue moving counterweight toward disc until switch operates as described in step “b”.

d. If switch opens BEFORE lint panel is opened

the proper distance, in step “b”, it should be adjusted so it is LESS sensitive. Depress the spring clip and move counterweight a small amount away from the disc. Retest by opening lint panel and continue moving counterweight away from disc until switch operates as described in step “b”.

The airflow switch is set at the factory for proper operation. However, at installation, and following repairs, airflow must be checked. The airflow switch operation is controlled by the counterweight position on the shaft. Moving the counterweight changes airflow switch sensitivity. The counterweight should be adjusted so the disc moves away from the cabinet when the lint panel is opened 1-1/2 inches (38.1 mm). Adjust the airflow switch as follows:

M411433 69

Page 67

Section 6 Adjustments

AIRFLOW

SWITCH

REAR PANEL OF TUMBLER

SWITCH

ADJUSTING

SCREWS

SCREW

AIRFLOW

SWITCH

MOUNTING

BRACKET

SWITCH

LEVER

VANE

LEVER

ARM

DISC

COUNTERWEIGHT

Figure 42

SPRING

CLIP

SWITCH

LEVER

SPRING

CLIP

COUNTER

WEIGHT

DISC

TU050-SV

70 M411433

Page 68

Section 6 Adjustments

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

81. LOADING DOOR SWITCH

Refer to Figure 43.

The door switch should be adjusted so the cylinder stops when door is opened two inches (51 mm), plus or minus 1/4 inch (6 mm). This switch is a normally open switch and is closed when the door is closed.

a. Close door and start tumbler, then slowly open

loading door. Cylinder and heat system should shut off when door is open two inches (51 mm) plus or minus 1/4 inch (6 mm).

b. Slowly close loading door. When door is two

inches (51 mm) from being fully closed, the tab on the door should contact the switch rod and depress it enough to close the switch with an audible “click”.

c. If tab does not depress the switch rod enough to

operate the switch, adjust switch position. If switch position doesn’t achieve proper operation, bend tab outward and repeat steps “a” and “b”.

SWITCH

ARM

SWITCH

BRACKET

ADJUSTING

SCREWS

DOOR

SWITCH

INTERLOCK

ROD

TAB

T249IE1C

Figure 43

M411433 71

Page 69

Section 6 Adjustments

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

82. LOADING DOOR STRIKE

Refer to Figure 44.

The loading door strike must be adjusted so it has sufficient tension to hold loading door closed against the force of a tumbling load. The door strike is properly adjusted when 8-15 lbs. (17.6-33 kg) of pull is required to open door.

To adjust, open door, loosen acorn nut and turn door strike screw in or out as required. Retighten acorn nut.

DOOR

STRIKE

83. DRIVE BELT TENSION

WARNING

To avoid bodily injury, disconnect power to tumbler before performing this operation.

W278

To find the proper tension, apply light thumb pressure midway between the sheave and motor pulley, and adjust until the belt can be depressed approximately 1/2 inch (13 mm).

CAUTION

Adjusting the drive belt tension WILL AFFECT drive chain tension. You MUST check and readjust the chain tension after adjusting belt tension.

W282

Nonreversing Tumblers:

Refer to Figure 45. a. Remove drive guard from rear of tumbler.

b. Loosen adjusting bolt holding idler housing

assembly to the guide rails.

c. Lift idler housing assembly upward until proper

belt tension is reached, then raise and retighten adjusting bolt.

DOOR

LATCH

Reversing Tumblers:

Refer to Figure 46. a. Remove drive guard from rear of tumbler.

b. Loosen motor mounting bracket/side bracket

mounting screws and loosen four adjusting screw locknuts, and move motor mounting

ACORN

NUT

T048IE1D

bracket up or down in slots, equally, using the four adjusting screws. Refer to Figure 38.

c. Tighten adjusting screw locknuts and side

Figure 44

bracket mounting screws securely, taking care to keep mounting bracket level so as not to disturb alignment of motor pulley.

72 M411433

Page 70

Section 6 Adjustments

BELT/CHAIN

NONREVERSING

MODELS

SHEAVE

1/2" (12.7 mm)

DEFLECTION

CYLINDER

DRIVE CHAIN

WARNING! DO NOT OPERATE WITHOUT GUARDS IN PLACE.

CYLINDER

SPROCKET

IDLER

SPROCKET

JAM NUT

IDLER

SHAFT

BELT ADJUSTING

BOLT AND NUT

1/2" (12.7 mm)

DEFLECTION

BELT

MOTOR

PULLEY

DRIVE

SPROCKET

IDLER

HOUSING

GUIDE

RAIL

GUIDE RAIL

WASHER

GROUND WIRE

(Green)

T229IE3C

NOTE: Tumbler is shown with guards removed for ilustration purposes only. Never operate the tumbler with the guards removed.

Figure 45

M411433 73

Page 71

Section 6 Adjustments

MOTOR

PULLEY

POLY

V-BELT

CYLINDER

MOTOR

BELT/CHAIN

REVERSING

MODELS

LOCKNUT

ADJUSTING

BOLT

1/2" (13 mm)

DEFLECTION

SHEAVE

GUIDE

RAILS

IDLER HOUSING

ATTACHING

BOLT AND NUT

CYLINDER

SPROCKET

CYLINDER

DRIVE CHAIN

1/2" (13 mm)

DEFLECTION

T324PE3B

Figure 46

74 M411433

Page 72

Section 6 Adjustments

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

84. DRIVE TENSION

WARNING

To avoid bodily injury, disconnect power to tumbler before performing this operation. To find the proper tension, apply light thumb pressure midway between the cylinder sprocket and the idler sprocket, and adjust until the chain can be depressed approximately 1/2 inch (13 mm).

W279

IMPORTANT: After a tumbler has been in operation over an extended period of time, a “HIGH POINT” will develop on the cylinder drive sprocket from use and wear. Turn the sprocket manually with drive chain in place until this “high point” is at the top center. The “high point” can be found by noticing increased chain tension while slowly rotating the cylinder sprocket manually. The chain must be at the “high point” when making the adjustment.

Nonreversing Tumblers

Refer to Figure 45. a. Remove drive guard.

b. To adjust chain tension, loosen jam nut holding

idler sprocket to housing.

c. Move idler sprocket left or right until proper

chain tension is reached, then re-tighten the jam nut.

d. Check chain tension.

Reversing Tumblers

Refer to Figure 46. a. Remove drive guard.

b. To adjust chain or belt tension, loosen jam nut

on idler housing attaching bolt, Figure 31, and move entire idler housing assembly up or down in the guide rails to change tension.

c. When chain tension is correct, tighten idler

housing attaching bolts. Hold idler housing firmly in position while tightening jam nut on attaching bolt.

d. Check chain or belt tension after tightening jam

nut on idler housing attaching bolt.

M411433 75

Page 73

Section 6 Adjustments

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

85. CYLINDER CLEARANCE

The clearance between the cylinder rim and front panel must be adjusted so the cylinder is centered within the front panel opening when the cylinder is fully loaded and is turning. However, the adjustment should be made when the cylinder is empty.

NOTE: If the cylinder is not properly adjusted, the cylinder rim will rub against the front panel.

a. Open loading door and check the gap between

the center of the front panel top flange and the cylinder rim. Proper adjustment is when the gap

is 7/16 inch (11 mm). Refer to Figure 47. b. Remove drive guard. c. Loosen the four trunnion housing bolts. Refer

to Figure 48. d. Loosen the locknuts on the trunnion housing

adjusting bolts. Refer to Figure 48.

CYLINDER

RIM

e. Turn the adjusting bolts in or out as necessary

to obtain proper clearance between cylinder rim and front panel.

NOTE: Turning the adjusting bolts clockwise will raise the cylinder and turning them counterclockwise will lower the cylinder. Turn both bolts evenly to adjust top and bottom clearance. Turn one or the other adjusting bolt in or out to adjust side clearance.

f. After the cylinder is properly adjusted, tighten

the adjusting bolt locknuts and the four trunnion housing bolts.

g. Install the drive guard removed in step “b”.

NOTE: If adjusting the trunnion housing fails to correct the clearance, the problem is probably due to a worn trunnion shaft or bearings.

INSIDE FRONT OF CYLINDER

7/16" (11.113 mm)

CYLINDER RIM /

FRONT PANEL

9/32" ± 1/32"

FRONT

PANEL FLANGE

(Top Shown)

FORE / AFT

CLEARANCE

FLANGE

CLEARANCE

T218SE3B

Figure 47

76 M411433

Page 74

Section 6 Adjustments

BELT/CHAIN

NONREVERSING

MODELS

TRUNNION

HOUSING

BOLTS

(2 per side)

LOCKNUTS

TRUNNION HOUSING

ADJUSTING BOLTS

TU202-PT

Figure 48

M411433 77

Alliance Laundry Systems DCB75FG, DTB634, DTB75CG, DTB74EG, DTB75FG Service Manual

Table of Contents

Safety Information

Introduction

Model Identification

Troubleshooting

Grounding

Service Procedures

Adjustments