American Dryer Corp ML-310 Phase 7 User Manual

4.5 (2)

ML-310 Phase 7

Service Manual

with Tilt Options

American Dryer Corporation

88 Currant Road

Fall River, MA02720-4781

Telephone: (508) 678-9000 / Fax: (508) 678-9447

E-mail: techsupport@amdry.com

0906000DMG/tcosta

ADC Part No. 450421

Retain This Manual In A Safe Place For Future Reference

American Dryer Corporation products embody advanced concepts in engineering, design, and safety. If this product is properly maintained, it will provide many years of safe, efficient, and trouble-free operation.

ONLY qualified technicians should service this equipment.

OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation manual included with the dryer.

The following “FOR YOUR SAFETY” caution must be posted near the dryer in a prominent location.

FOR YOUR SAFETY

Do not store or use gasoline or other flammable vapors or liquids in the vicinity of this or any other appliance.

POUR VOTRE SÉCURITÉ

Ne pas entreposer ni utiliser d’essence ni d’autres vapeurs ou liquides inflammables dans le voisinage de cet appareil ou de yout autre appareil.

We have tried to make this manual as complete as possible and hope you will find it useful. ADC reserves the right to make changes from time to time, without notice or obligation, in prices, specifications, colors, and material, and to change or discontinue models.

Important

For your convenience, log the following information:

ML-310 Phase 7 Tilting

DATE OF PURCHASE ____________________________ MODEL NO. __________________________________________

RESELLER’S NAME

_______________________________________________________________________________________

Serial Number(s)

________________________________________________________________________________________

 

________________________________________________________________________________________

 

________________________________________________________________________________________

Replacement parts can be obtained from your reseller or the ADC factory. When ordering replacement parts from the factory, you can FAX your order to ADC at (508) 678-9447 or telephone your order directly to the ADC Parts Department at (508) 678-9000. Please specify the dryer model number and serial number in addition to the description and part number, so that your order is processed accurately and promptly.

The illustrations on the following pages may not depict your particular dryer exactly. The illustrations are a composite from the various dryer models. Be sure to check descriptions of the parts thoroughly before ordering.

“IMPORTANT NOTE TO PURCHASER”

Information must be obtained from your local gas supplier on the instructions to be followed if the user smells gas. These instructions must be posted in a prominent location near the dryer.

IMPORTANT

YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS SUPPLY or THE STEAM SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLATION, or TESTING OF ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) STANDARDS.

FOR YOUR SAFETY

DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPOR AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.

DO NOT DRY MOP HEADS IN THE DRYER.

DO NOT USE DRYER IN THE PRESENCE OF DRY CLEANING FUMES.

CAUTION

DRYERS SHOULD NEVER BE LEFT UNATTENDED WHILE IN OPERATION.

WARNING

CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR THE DRYERS.

CHILDREN SHOULD BE SUPERVISED IF NEAR DRYER(S) IN OPERATION.

WARNING

The dryer must never be operated with any of the back guards, outer tops, or service panels removed. PERSONAL INJURY or FIRE COULD RESULT.

WARNING

DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER OR SCREEN IN PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED.

IMPORTANT

PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment and specified in the installation and operator's manual included with the dryer.

Dryers must not be installed or stored in an area where it will be exposed to water or weather.

The wiring diagram for the dryer is located in the front electrical control box area.

Table of Contents

ML-310 REFERENCE GUIDE (Basket [Tumbler] Section)

................................ 3

ML-310 REFERENCE GUIDE (Base Section) ......................................................

4

SECTION I

 

SAFETY PRECAUTIONS ........................................................................................

5

SECTION II

 

ROUTINE MAINTENANCE ....................................................................................

7

A. Cleaning .....................................................................................................................................

7

B.

Lubrication .................................................................................................................................

9

C. Adjustments .............................................................................................................................

10

SECTION III

 

SPECIFICATIONS and DIMENSIONS ...............................................................

11

A. Specifications (Gas and Steam Models) ....................................................................................

11

B. Dimensions ...............................................................................................................................

12

SECTION IV

 

INSTALLATION REQUIREMENTS ....................................................................

15

A. Enclosure/Air Supply/Exhaust Requirements ..............................................................................

15

B. Electrical and Gas Requirements ...............................................................................................

16

C. Operational Service Check Procedure ......................................................................................

16

SECTION V

 

COMPONENT DESCRIPTION/REPLACEMENT ...........................................

17

A. Heat Section .............................................................................................................................

17

B. Troubleshooting The Direct Spark Ignition (DSI) System ...........................................................

23

C. Natural Gas and Liquid Propane (L.P.) Gas Conversion Instructions ..........................................

40

D. Steam Coil System Operation ...................................................................................................

41

E.

Sprinkler System Description ....................................................................................................

46

F.

TiltingSystemDescription .........................................................................................................

52

G.

Air JetAssembly .......................................................................................................................

58

H. Blower (Squirrel Cage Fan) MotorAssembly ............................................................................

60

I.

Filter/RegulatorAssembly .........................................................................................................

67

J.

Door Systems ...........................................................................................................................

68

K. Control and Electrical System ...................................................................................................

74

L.

Basket (Tumbler) System ..........................................................................................................

87

SECTION VI

 

PHASE 7 OPL SYSTEM DIAGNOSTICS ...........................................................

96

A. Diagnostic (L.E.D. Display) Fault Messages ..............................................................................

96

B. Input/Output (I/O) Board Input and Output Light Emitting Diode (L.E.D.) Indicators .................

97

SECTION VII

 

TROUBLESHOOTING .........................................................................................

102

SECTION VIII

 

PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT

 

COMPONENTS .....................................................................................................

110

American Dryer Corp ML-310 Phase 7 User Manual

ML-310 Reference Guide

(Basket [Tumbler] Section)

3

ML-310 Reference Guide

(Base Section)

4

SECTION I

SAFETY PRECAUTIONS

CAUTION: The dryer should never be left unattended while in operation.

WARNING: For your safety, the information in this manual must be followed to minimize the risk of fire or explosion or to prevent property damage, personal injury, or loss of life.

WARNING: The dryer must never be operated with any of the back guards, outer tops, or service panels removed. PERSONAL INJURY or FIRE COULD RESULT.

1.DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

2.Purchaser/user should consult the local gas supplier for proper instructions to be followed in the event the user smells gas. The instructions should be posted in a prominent location.

3.WHAT TO DO IF YOU SMELL GAS...

a.DO NOT try to light any appliance.

b.DO NOT touch any electrical switch.

c.DO NOT use any phone in your building.

d.Clear the room, building, or area of ALL occupants.

e.Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.

f.If you cannot reach your gas supplier, call the fire department.

4.Installation and service must be performed by a qualified installer, service agency, or gas supplier.

5.Dryer(s) must be exhausted to the outdoors.

6.Although ADC produces a very versatile machine, there are some articles that, due to fabric composition or cleaning method, should not be dried in it.

WARNING: Dry only water washed fabrics. DO NOT dry articles spotted or washed in dry cleaning solvents, a combustible detergent, or “ALL purpose” cleaner.

EXPLOSION COULD RESULT.

WARNING: DO NOT dry rags or articles coated or contaminated with gasoline, kerosene, oil, paint, or wax.

EXPLOSION COULD RESULT.

5

WARNING: DO NOT dry mop heads. Contamination by wax or flammable solvents will create a fire hazard.

WARNING: DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or similarly textured rubberlike materials. Drying in a heated basket (tumbler) may damage plastics or rubber and also may be a fire hazard.

7.A program should be established for the inspection and cleaning of lint in the burner area, exhaust duct work, and area around the back of the dryer. The frequency of inspection and cleaning can best be determined from experience at each location.

WARNING: The collection of lint in the burner area and exhaust duct work can create a potential fire hazard.

8.For personal safety, the dryer must be electrically grounded in accordance with local codes and/or the National Electrical Code ANSI/NFPA NO. 70-LATEST EDITION or in Canada, the Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION.

NOTE: Failure to do so will VOID THE WARRANTY.

9.UNDER NO CIRCUMSTANCES should the dryer door switches, lint drawer switch, or heat safety circuit, ever be disabled.

WARNING: PERSONAL INJURY or FIRE COULD RESULT.

10.This dryer is not to be used in the presence of dry cleaning solvents or fumes.

11.Remove articles from the dryer as soon as the drying cycle has been completed.

WARNING: Articles left in the dryer after the drying and cooling cycles have been completed can create a fire hazard.

12. READ and FOLLOW ALL CAUTION and DIRECTION LABELS ATTACHED TO THE DRYER.

WARNING: YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS SUPPLY or THE STEAM SUPPLY BEFOREANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE TO ALLOWACCESS FOR CLEANING,ADJUSTING, INSTALLATION, or TESTING OFANY EQUIPMENT per OSHA(Occupational Safety and HealthAdministration)

STANDARDS.

IMPORTANT: Label ALL wires prior to disconnection when servicing the microprocessor controller (computer) and the ignition module. WIRING ERRORS CAN CAUSE

IMPROPER and DANGEROUS OPERATION.

6

SECTION II

ROUTINE MAINTENANCE

A. CLEANING

A schedule should be established for periodic inspection, cleaning, and removal of lint from various areas of the dryer, as well as throughout the duct work system. The frequency of cleaning can best be determined from experience at each location. Maximum operating efficiency is dependent upon proper air circulation. The accumulation of lint can restrict this airflow. If the guidelines in this section are met, an ADC dryer will provide many years of efficient, trouble-free, and most importantly, safe operation.

WARNING: LINT FROM MOST FABRICS IS HIGHLY COMBUSTIBLE. THE ACCUMULATION OFLINT CAN CREATEAPOTENTIALFIRE HAZARD.

WARNING: KEEP DRYERAREA CLEAR and FREE FROM COMBUSTIBLE

MATERIALS, GASOLINE, and OTHER FLAMMABLE VAPORS and

LIQUIDS.

NOTE: REMOVE POWER FROM THE MACHINE BEFORE PERFORMING ANY MAINTENANCE ON THE MACHINE.

NOTE: Suggested time intervals shown are for average usage which is considered six (6) to eight (8) operational (running) hours per day.

SUGGESTED CLEANING SCHEDULE

EVERY THIRD or FOURTH LOAD

Clean the lint screen. A clogged lint screen will cause poor dryer performance. The lint screen is located in the lint drawer in the base of the dryer. Pull out the lint drawer, brush the lint off the lint screen, and remove the lint. Inspect the lint screen and replace if torn.

NOTE: The frequency of cleaning the lint screens can best be determined from experience at each location.

WEEKLY

Open the hinged panels on each side of the basket (tumbler) section and remove any lint accumulation from the basket (tumbler) drive motor, drive shafts, gear reducer, drive belts, drive wheels, and drive shaft bearings.

Slide the lint basket ALL the way out of the dryer and clean any lint accumulation off of the temperature sensor bracket, which is located above the lint basket.

7

WARNING: TOAVOID THE HAZARD OF ELECTRICALSHOCK, DISCONTINUE ELECTRICALSUPPLYTO THE DRYER.

MONTHLY

Empty the compressed air filter bowl.

NOTE: REGULATOR PRESSURE IS TO BE SET

AT 80 PSI (5.51 BARS).

Clean any lint accumulation from the gas valve and burner area at the top of the dryer, the fan (impellor) motor, and the fan (impellor) bearings located in the dryer base.

EVERY 6 MONTHS

STEAM MODELS - Clean the steam coil fins. We suggest using compressed air and a vacuum cleaner with brush attachment.

NOTE: When cleaning steam coil fins, be careful not to bend the fins. If fins are bent, straighten by using a fin comb, which is available from any local air conditioning supply house.

Inspect and remove any lint accumulation in customer furnished exhaust duct work system and from the dryer’s internal exhaust ducting.

NOTE: THE ACCUMULATION OF LINT IN THE EXHAUST DUCT WORK CAN CREATEAPOTENTIALFIRE HAZARD.

NOTE: DO NOT OBSTRUCT THE FLOW OF COMBUSTION and VENTILATION AIR. CHECK CUSTOMER FURNISHED BACK DRAFT DAMPERS IN THE EXHAUST DUCT WORK. INSPECT and REMOVE ANY LINTACCUMULATION WHICH CAN CAUSE THE DAMPER TO BIND or STICK.

NOTE: When cleaning the dryer cabinet(s), avoid using harsh abrasives. Aproduct intended for the cleaning of appliances is recommended.

Clean off any lint accumulation on top of the temperature probe and the hi-limit switch located above the lint basket.

8

B. LUBRICATION

MONTHLY

The two (2) bearings that support the impellor/fan shaft must be lubricated. Use Shell Alvania #2 grease or its equivalent. Generically, this grease would be described as a NLGI Grade 2 multipurpose industrial grease with a lithium thickener and mineral base oil.

EVERY 3 MONTHS

The four (4) bearings that support the drive and idler shafts must be lubricated. Use Shell Alvania #2 grease or its equivalent. Generically, this grease would be described as a NLGI Grade 2 multipurpose industrial grease with a lithium thickener and mineral base oil.

9

EVERY 6 MONTHS

Change gear oil in tumbler shaft gear reducer.

1.Remove the drain plug (located at the bottom rear of the reducer).

2.After oil is completely drained, replace the drain plug.

3.Remove the vent plug and pour in 1.48 quarts (1.4 liters) of Mobil Oil DTE HH5G (I.S.O. viscosity grade 460), SAE 90, or its equivalent.

C. ADJUSTMENTS

7 DAYS AFTER INSTALLATION and EVERY 6 MONTHS THEREAFTER

Inspect bolts, nuts, screws, (bearing setscrews), nonpermanent gas connections (i.e., unions, shutoff valves, orifices), and grounding connections. Fan (impellor) V-belts, along with the motor and drive belts should be examined and replaced if necessary. Tighten loose V-belts when necessary. Complete operational check of controls and valves. Complete operational check of ALL safety devices (i.e., door switches, lint drawer switch, sail switch, burner, and hi-limit thermostats).

1 0

SECTION III

SPECIFICATIONS and DIMENSIONS

A. SPECIFICATIONS (Gas and Steam Models)

MAXIMUM CAPACITY (Dry Weight)

310 lbs.

 

141 kg

BASKET (Tumbler) DIAMETER

62-1/2”

 

158.75 cm

BASKET (Tumbler) DEPTH

 

60”

 

152.4 cm

BASKET (Tumbler) VOLUME

 

106.5 cu. ft.

 

3.02 cu. m.

DRIVE MOTOR

 

5 HP

 

3.73 kw

DOOR OPENING (Diameter)

 

36-3/4” w x 43” h

93.3 cm x 109.2 cm

DOOR SILL HEIGHT - LEVEL

36-1/2”

 

92.71 cm

COMPRESSED AIR VOLUME

 

11 cfh

 

0.3 cmh

COMPRESSED AIR CONNECTION

3/8” F.P.T.

 

 

 

 

 

 

 

VOLTAGE AVAILABLE

208-460v 3ø 3, 4w

50/60 Hz

 

 

 

 

 

 

 

Gas*

BLOWER MOTOR

 

15 HP

 

11.18 kw

HEAT INPUT

 

1,125,000 btu/hr

283,500 kcal/hr

 

 

 

APPROX. WEIGHT (Uncrated)

5,100 lbs.

 

2,313 kg

 

AIRFLOW

 

6,500 cfm

 

184.06 cmm

 

INLET PIPE SIZE

 

1-1/2” F.P.T.

 

 

 

 

 

 

 

VOLTAGE AVAILABLE

208-460v 3ø 3, 4w

50/60 Hz

 

 

 

 

 

 

 

 

BLOWER MOTOR

 

25 HP

 

18.64 kw

Steam*

APPROX. WEIGHT (Uncrated)

5,600 lbs.

 

2,540 kg

AIRFLOW

 

8,500 cfm

 

240.69 cmm

 

 

 

 

STEAM CONSUMPTION

BOILER HP

 

 

 

NORMAL LOAD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1,153 lbs/hr

 

523 kg/hr

35

 

 

 

OPERATING STEAM PRESSURE

STEAM SUPPLY

STEAM RETURN

 

 

 

 

 

 

 

125 PSI max

 

8.62 bars

2” M.P.T.

1-1/4” M.P.T.

 

 

 

 

 

 

 

Shaded areas are stated in metric equivalents

*Dryer must be provided with a clean, dry, and regulated 80 PSI +/- 10 PSI (5.51 bars +/- 0.68 bars) air supply (equivalent volume = 11 cfh [0.31 cmh]).

NOTE: ADC reserves the right to make changes in specifications at any time without notice or obligation.

1 1

B. DIMENSIONS

NOTE: ADC reserves the right to make changes in specifications at any time without notice or obligation.

1 2

NOTE: ADC reserves the right to make changes in specifications at any time without notice or

obligation.

1 3

NOTE: ADC reserves the right to make changes in specifications at any time without notice or

obligation.

1 4

SECTION IV

INSTALLATION REQUIREMENTS

Installation should be performed by competent technicians in accordance with local and state codes. In the absence of these codes, installation must conform to applicable American National Standards: National Fuel Gas Code ANSI.Z223.1-LATEST EDITION and/or National Electrical Code ANSI/NFPA NO. 70-LATEST EDITION, or in Canada, the Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION.

A. ENCLOSURE/AIR SUPPLY/EXHAUST REQUIREMENTS

NOTE: The following information is very brief and general. ML-310 Phase 7 Tilting Installation Manual (ADC

For a detailed description, refer to the Part No. 113127) included with the dryer.

Bulkheads and partitions around the dryer should be made of noncombustible materials. Allowances should be made for the opening and closing of the control door and lint door. Also, allowances should be made in the rear for ease of maintenance. (Refer to the ML-310 Phase 7 Tilting Installation Manual [ADC Part No. 113127] for recommended distances and minimum allowances required.)

When the dryer is operating, it draws in room air, heats it, passes this air through the basket (tumbler), and exhausts it out of the building. Therefore, the room air must be continually replenished from the outdoors. If the make-up air is inadequate, drying time and drying efficiency will be adversely affected. Ignition problems and sail switch “fluttering” problems on gas dryers may result, and you also could have premature motor failure from overheating. The air supply must be given careful consideration to insure proper performance of each dryer.

IMPORTANT: Make-up air must be provided from a source free of dry cleaning fumes. Make-up air that is contaminated by dry cleaning fumes will result in irreparable damage to the motors and other dryer components.

Exhaust duct work should be designed and installed by a competent technician. Improperly sized duct work will create excessive back pressure which will result in slow drying, increased use of energy, and shut down of the burner by the airflow (sail) switch, burner hi-limit, or lint chamber hi-heat protector thermostat. (Refer to the ML-310 Phase 7 Tilting Installation Manual [ADC Part No. 113127] for more details.)

CAUTION: IMPROPERLY SIZED or INSTALLED EXHAUST DUCT WORK CAN CREATEAPOTENTIALFIRE HAZARD.

1 5

B. ELECTRICAL and GAS REQUIREMENTS

It is your responsibility to have ALL electrical connections made by a properly licensed and competent electrician to assure that the electrical installation is adequate and conforms with local and state regulations or codes. In the absence of such codes, ALL electrical connections, materials, and workmanship must conform to the applicable requirements of the National Electrical Code ANSI/NFPANO. 70-LATEST EDITION, or in Canada, the Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION.

IMPORTANT: Failure to comply with these codes or ordinances and/or the requirements stipulated in this manual can result in personal injury or component failure.

The dryer installation must meet the American National Standard, National Fuel Gas Code ANSI Z223.1- LATEST EDITION, or in Canada, the Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION (for Electrical Connections) as well as, local codes and ordinances, and must be done by a qualified technician.

NOTE: Undersized gas piping will result in ignition problems and slow drying and can create a safety hazard.

The dryer must be connected to the type of gas (natural or liquid propane [L.P.]) indicated on the dryer data label. If this information does not agree with the type of gas available, contact the reseller who sold the dryer or contact the factory.

The gas input ratings shown on the dryer data label are for elevations up to 2,000 feet (609.6 meters), unless elevation requirements of over 2,000 feet (609.6 meters) were specified at the time the dryer order was placed with the factory. The adjustment for dryers in the field for elevations over 2,000 feet (609.9 meters) is made by changing the burner orifices. If this adjustment is necessary, contact the reseller who sold the dryer or contact the factory.

NOTE: Any burner changes must be made by a qualified technician.

C. OPERATIONAL SERVICE CHECK PROCEDURE

After performing any service or maintenance function, an operational check should be performed to insure that ALL components are performing properly.

1.Make a complete operational check of ALL the operating controls to insure that the timing is correct; temperature selection switches are functioning properly.

2.Make a complete operational check of ALL safety related circuits, door switches, hi-limit thermostat, sail switch, cycling thermostats, etc.

1 6

SECTION V

COMPONENT DESCRIPTION/REPLACEMENT

A. HEAT SECTION

The ML-310 dryer uses three (3) types of heat sources: natural gas, liquid propane (L.P.) gas, and steam. Natural gas and L.P. gas are not directly replaceable. The gas valves need to be modified to use other than the type of heat specified on the nameplate.

1.The MLG-310 gas dryers utilize a Direct Spark Ignition (DSI) module to monitor that a flame is established. If for some reason the flame signal is lost, the DSI module will shut off the gas valve and not retry ignition (no try to restart the flame). A spark of approximately 14,000 volts is used to establish a flame. The DSI module will turn the gas valve on and ignitor/flame-probe will spark for 8-seconds attempting a flame. Each time the dryer calls for heat the microprocessor controller (computer) will send a 24 VAC signal through the exhaust hi-limit, sail switch, and oven hi-limit. At that point, the DSI module will try for ignition.

DIRECT SPARK IGNITION (DSI) SYSTEM COMPONENTS/FUNCTIONS

Johnson (DSI) Control Module P/N 128935

ADC (DSI) Control Module P/N 128973

1 7

24 VAC Direct Spark Ignition (DSI) Modules

a. The Direct Spark Ignition (DSI) module is a 24 VAC device designed to be the “controller” of the DSI system. When activated by the dryer controls, this module constantly monitors and controls the functions of the DSI system (i.e., spark activation, gas valve off and on, flame verification, etc.). Additionally, the DSI module has self-diagnostic capabilities.

Johnson (DSI) Control Module

ADC (DSI) Control Module

P/N 128935

P/N 128973

b.The Ignitor/Flame-Probe Assembly is located in the burner flame area and is used to ignite the gas by use of a high voltage spark (approximately 14,000 volts) and to provide feedback

information to the DSI module as to whether the burner flame is evident (on).

Ignitor/Flame-Probe Assembly

c.The Burner Manual Reset Hi-Limit Switch is a thermostat type switch located in the burner. Its function is to discontinue heat (flame) in the event of an over temperature situation (above

330º F [166º C]). For dryers manufactured, as of May 26,

1998, the hi-limit must be manually reset once the device trips.

330º F (166º C) Thermostat

d.The Sail Switch Assembly is located on the Burner Assembly, downstream of the flame tubes. Its function is to detect whether or not there is sufficient airflow through the dryer.

Sail Switch Assembly

1 8

e.The Manual Reset Basket (tumbler) Hi-Limit Switch is a thermostat type switch located above the lint basket. Its function is to discontinue heat (flame) in the event of an over temperature situation (above 225º F [107º C]).

f.The gas valve used in the dryer is of the redundant type which means that the gas valve is actually two (2) gas valves in one (1); one (1) in series with the other. This is a safety feature, which provides protection against gas flow in the event that one

(1) of the valves does not seat properly. The valve also regulates the incoming gas pressure.

NOTE: THE DIRECT SPARK IGNITION (DSI) GAS VALVES ARE NOT FIELD REPAIRABLE.

225º F (107º C) Thermostat

Redundant Gas Valve

g.Normal Operation of the DSI System (refer to the illustration on page 17).

1)The DSI System consists of a microprocessor-based control module, along with an Ignitor/FlameProbe Assembly. This control utilizes a high voltage synchronous spark ignitor and a rectified flame sensor probe signal to locally control ALL basic functions in the gas burner.

On a call for heat by the dryer’s controls, 24 VAC is applied to the DSI module at which time the module’s light emitting diode (L.E.D.) indicator will light “red” indicating that power has been established to the module. Almost immediately (up to approximately 1.5-seconds [prepurge]) the indicator will light “green,” the gas valve opens and the spark burst will be evident (on) for approximately 8- seconds. The burner flame should now be established/confirmed.

If at this time the flame has not been established and confirmed, the DSI module will “LOCKOUT” and the module’s L.E.D. indicator will light “red” and stay on continuously. “Burner Ignition Control Fault” will display. To clear this fault code press the “CLEAR/STOP” key.

Once the burner flame is established and confirmed, the DSI module indicator will light “green,” and the burner system will continue through a normal heating cycle, where the DSI system will cycle on and off as required by the dryer’s controls.

During the normal heating cycle, should a “FLAMEOUT” occur (i.e., severe air turbulence forces the flame away from the Ignitor/Flame-Probe Assembly), the DSI module will shut the gas valve off and immediately try to reestablish the burner flame. The DSI module will attempt to light the burner ONLY ONCE. If flame is not established, the DSI module will “LOCKOUT” and “Burner Ignition Control Fault” will display. To clear this fault code press the “CLEAR/STOP” key.

1 9

h. Troubleshooting Flowchart - Quick Reference...

First Visual Check

No Spark And System Does Not Work

 

 

 

 

 

 

 

 

 

Is 24 VAC available

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

at transformer?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is 24 VAC present from terminal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

THS(2) to ground?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

Yes

 

Is power available

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to primary?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

Replace

 

 

 

 

 

 

 

 

 

 

 

Are thermostat contacts and

 

 

 

 

 

 

 

Transformer.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

hi-limit control contacts closed?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Determine why

 

 

 

 

 

 

 

 

 

 

or replace

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

hi-limits

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

voltage is not

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

present.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check continuity of wiring to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

determine why voltage does

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

not exist at THS(2).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is jumper installed

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

from terminal 5 to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ground?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Install

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Jumper.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Open thermostat contacts for 30 seconds. Close contacts and wait for prepurge (if applicable)

period. Is spark present now?

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn off supply voltage.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check high voltage cable.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is it securely attached

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to DSI module?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is condition of high voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

cable good (not brittle,

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

burnt, or cracked)?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Securely attach wire

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

to DSI module

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace high

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

voltage cable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is spark electrode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ceramic cracked

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

or is electrode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

grounded out?

 

 

 

 

 

 

 

 

 

 

 

Replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

DSI module

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace spark electrode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

assembly.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

System was in lockout.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Observe a complete operating

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

cycle to determine why

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

control locked out.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 0

i. Troubleshooting Flowchart - Quick Reference...

Second Visual Check

Spark Present But Main Burner Does Not Come On

Is main valve wiring securely attached to terminal M.V.(3) and ground?

No Yes

Secure wiring to

M.V.(3) and ground.

Replace

DSI module

Determine why continuity does not exist.

Is 24 VAC present between terminals M.V.(3) and ground?

No

Yes

Check for continuity in wiring from M.V.(3) to gas valve, and gas valve to GR.

No Yes

Set gas pressure Natural 3.5 inches W.C. (8.7 mb) L.P. 10.5 inches W.C. (26.1 mb)

Is inlet gas pressure per manufacturer's specifications?

No Yes

Correctly adjust the gap and position of spark ignitor.

Is spark gap .125 in.(3.175 mm) and in gas stream?

No Yes

Replace gas valve.

2 1

j. Troubleshooting Flowchart - Quick Reference...

Third Visual Check

Main Burner Lights But Will Not Stay On

 

Is flame sensor cable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

securely attached

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to sense (4) terminal?

 

 

 

 

 

 

 

 

Does continuity exist

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

from control

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to flame sensor?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reattach flame

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

Yes

 

 

 

 

 

 

 

 

 

 

sensor wire to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

sense (4) terminal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

sensor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

cable.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is flame sensor corroded

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

or is ceramic cracked?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Correct or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

replace sensor.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Does continuity exist in

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ground path from burner

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to control?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check connection.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check flame sensing current

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

during trial. Is current

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

greater than 0.3 A DC?

 

 

 

 

 

 

Is flame sensor positioned per

 

 

 

 

 

 

 

 

 

 

 

 

 

manufacturer's specifications?

 

 

 

 

 

 

 

No

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Readjust per

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

specifications

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DSI module

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DSI module

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 2

B. TROUBLESHOOTING THE DIRECT SPARK IGNITION (DSI) SYSTEM

NOTE: The troubleshooting information provided in this manual is intended for use by qualified service technicians only. OBSERVEALLSAFETYPRECAUTIONS displayed on the equipment or specified in the ML-310 Phase 7 Tilting Installation Manual (ADC Part No. 113127) included with the dryer.

IMPORTANT: UNDER NO CIRCUMSTANCES SHOULD ANY SAFETY or HEAT CIRCUIT DEVICES EVER BE DISABLED.

THE FOLLOWING PIECES OF TEST EQUIPMENT WILL BE REQUIRED TO TROUBLESHOOT

THIS SYSTEM WITH MINIMAL TIME AND EFFORT

DSI IGNITOR GAP FEELER GAUGE (1/8” [3.175 mm])

Used For Checking Gap Between Ignitor/ MANOMETER Flame-Probe Assembly and Spark Electrode

Used To Measure Gas Pressure In Inches

Of Water Column (W.C.)

Available From ADC

MULTIMETER/VOLTMETER

For Measuring Voltage

Available From ADC

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1.Direct Spark Ignition (DSI) Troubleshooting Terms (definitions) ADC (DSI) Control Module P/N 128973 a. DSI MODULE “RED” L.E.D. INDICATOR LIGHT - This “red” light emitting diode (L.E.D.) light is

located in the upper right corner of the DSI module (refer to the top illustration on page 18). This is a diagnostic indicator that simplifies the operational and troubleshooting procedures of the DSI system.

b. LOCKOUT MODE - DSI module “red” L.E.D. indicator light stays on continuously. This indicates there is a system fault and most likely the fault is the DSI module itself.

c. FLAMEOUT - Burner flame shut down by the DSI module due to lack of flame verification. This condition occurs only after ignition is evident but is lost. The DSI system will immediately attempt to relight the burner.

d.RECYCLE - Flame has been sensed but lost. Initiate a new sequence (THERE ARE NO RETRIES).

2.Troubleshooting and System Basic Diagnosis ADC (DSI) Control Module P/N 128973

a.Preliminary Steps

The following steps must be performed to minimize the time required to isolate cause of fault.

1)DSI module L.E.D. indicator light is off (no “red” or “green” light).

a)Check for voltage (approximately 24 VAC) across the DSI model terminals “TH” and “GND”...

If voltage (approximately 24 VAC) is evident, then, there is a malfunction within the DSI module itself, and it must be replaced.

If there is no voltage present, then problem is not the DSI module or the ignition system, the problem is elsewhere in the dryer (i.e., dryer’s heat circuit [sail switch, hi-limit circuits, etc.]).

2)DSI module L.E.D. indicator lights “red” for approximately 1.5-seconds (prepurge). This indicates that ALL the controls (including ALL the safety circuits) are functioning and power is being supplied to the DSI module.

3)DSI module L.E.D. indicator lights “green.” This indicates a normal heating cycle. This also indicates that the preliminary diagnostics of the module has confirmed that the DSI module is functional.

4)DSI module L.E.D. indicator lights “red” continuously...“LOCKOUT MODE.” This indicates that there is a system fault and most likely the fault is internal to the DSI module. To make sure, open and close the main door. Restart the dryer...if the module LOCKS OUT (“red” L.E.D. indicator light stays on continuously) again, replace the DSI module.

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If the dryer repeatedly has Direct Spark Ignition (DSI) module “LOCKOUT” failures, the cause may be due to high voltage not getting into the DSI module ignitor probe assembly.

5)Check to insure that the “red” high voltage wire (between the ignitor spark electrode and the DSI module) is not wrapped around the sensor probe wire (the wire between the DSI module FP terminal and the Ignitor/Flame-Probe Assembly). If the wires are touching one another, separate and secure in place AWAY FROM ONE ANOTHER.

6)Check to insure that the dryer is properly grounded and that the ground connections (GND) to the DSI module are secure.

7)If the problem persists, it is most likely to be in the external components (not the DSI module), or wiring, due to a “FLAMEOUT”...proceed as follows:

NOTE: Preliminary steps - DO NOT OMIT - to minimize the time required to troubleshoot this system.

a)Disconnect the electrical power to the dryer.

b)Visually check the DSI module components for visual damage.

c)Check wiring for loose connections, nicks, or cracking at the ceramic insulator, or shorting of the sensor to the burner.

d)Inspect the DSI Ignitor/Flame-Probe Assembly...

... check electrode for visible cracking at the ceramic insulator or shorting of sensor to burner

... check to insure that the flame sensor rod is positioned over the flame area

... check for carbon deposits on the flame sensor rod

... check to insure that there is a 1/8” +/- 1/32” (3.175 mm +/- 0.79248 mm) gap between the ground rod and the ignitor spark electrode

b.After performing these inspections and making corrections - if any - restore power to the dryer...start the dryer and operate through one (1) complete cycle to insure that ALL components are functioning properly. If a no heat condition persists refer to the Troubleshooting Flowcharts on page 27, page 28, and page 29.

1)To effectively use this information or the flowcharts, each step must be completed in sequence, performing whatever tests are suggested. After the completion of each test, the guide will direct the Service Technician to the next logical step in the troubleshooting sequence based on the outcome of the previous check.

2)Components should be replaced only after each step has been completed and replacement is suggested in the flowchart. However, the experienced technician realizes that a loose connection or broken or shorted wire may be at fault where electrical components are concerned...and not necessarily the suspected component itself.

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c.Three (3) Visual Checks

1)Does the Direct Spark Ignition (DSI) Ignitor/Flame-Probe Assembly start sparking? If not, refer to the FIRST VISUAL CHECK on page 27.

2)Does the main burner ignite?

If not, refer to the SECOND VISUAL CHECK on page 28.

3)Does the main burner remain lit after ignition has been established (“FLAMEOUT”)? If not, refer to the THIRD VISUAL CHECK on page 29.

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