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

...

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

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

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

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

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

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

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

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

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

Section 2 Introduction

Fresh Air Combustion Air Mixed Air Recirculating Air Exhaust Air

T007CE1A

Energy Saver Models

M411433 9

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

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

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

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

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

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

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

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

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

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

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

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

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

+ 51 hidden pages

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

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

Safety Information

Introduction

Model Identification

Troubleshooting