American Dryer Corp ML-310 Phase 7 User Manual
ML-310 Phase 7
Service Manual
with Tilt Options
American Dryer Corporation
88 Currant Road
Fall River, MA 02720-4781
T elephone: (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.
W e 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.
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.
Important
For your convenience, log the following information:
DA TE OF PURCHASE ____________________________ MODEL NO. __________________________________________
RESELLER’S NAME _______________________________________________________________________________________
Serial Number(s) ________________________________________________________________________________________
________________________________________________________________________________________
ML-310 Phase 7 Tilting
________________________________________________________________________________________
Replacement parts can be obtained from your reseller or the ADC factory. When ordering replacement parts from the factory ,
you can F AX 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.
“IMPORT ANT 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) ST ANDARDS.
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. Tilting System Description ......................................................................................................... 52
G . Air Jet Assembly....................................................................................................................... 58
H. Blower (Squirrel Cage Fan) Motor Assembly............................................................................ 60
I. Filter/Regulator Assembly ......................................................................................................... 67
J. Door Systems........................................................................................................................... 68
K. Control and Electrical System ................................................................................................... 74
L. Basket (Tumbler) System.......................................................................................................... 87
SECTION VI
PHASE 7 OPL SYSTEM DIAGNOSTICS ........................................................... 9 6
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
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 RESUL T .
WARNING: DO NOT dry rags or articles coated or contaminated with gasoline, kerosene, oil, paint,
or wax.
EXPLOSION COULD RESUL T .
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.
W ARNING: PERSONAL INJUR Y 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 ATT ACHED T O THE DR YER.
W ARNING: YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPL Y and
THE GAS SUPPL Y or THE STEAM SUPPL Y BEFORE ANY COVERS or
GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS
FOR CLEANING, ADJUSTING , INST ALLA TION, or TESTING OF ANY
EQUIPMENT per OSHA (Occupational Safety and Health Administration)
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 OPERA TION.
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 F ABRICS IS HIGHL Y COMBUSTIBLE. THE
ACCUMULA TION OF LINT CAN CREA TE A POTENTIAL FIRE HAZARD.
W ARNING: KEEP DR YER AREA CLEAR and FREE FROM COMBUSTIBLE
MA TERIALS, 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 of f 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
W ARNING: TO AVOID THE HAZARD OF ELECTRICAL SHOCK, DISCONTINUE
ELECTRICAL SUPPLY TO THE DRYER.
MONTHLY
Empty the compressed air filter bowl.
NOTE: REGULA TOR PRESSURE IS TO BE SET
A T 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 ACCUMULA TION OF LINT IN THE EXHAUST DUCT WORK CAN
CREA TE A POTENTIAL FIRE 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 LINT ACCUMULATION WHICH CAN
CAUSE THE DAMPER TO BIND or STICK.
NOTE: When cleaning the dryer cabinet(s), avoid using harsh abrasives. A product 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.
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.
Use Shell Alvania #2 grease or its
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
460), SAE 90, or its equivalent.
Mobil Oil DTE HH5G (I.S.O. viscosity grade
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).
10
SECTION III
SPECIFICATIONS and DIMENSIONS
A. SPECIFICATIONS (Gas and Steam Models)
MAX IMUM CA PA CIT Y (D ry Weight) 310 lbs. 141 kg
BASKET (Tumbler) DIAMETER 62-1/2”
BASKE T (Tumbler) DEPT H 60”
BASKE T (Tumbler) VOLU ME 106.5 cu. ft.
DRIVE MOTOR 5 HP
DO O R O PE N IN G (D iameter) 36-3/4 ” w x 43 ” h
DOOR SILL HEIGHT - LEVEL 36-1/2”
COMPRESSED AIR VOLUME 11 cfh
COMPRESSED AIR CONNECTION 3/8” F.P.T.
VOLT AG E AVAILA BL E 208-460v 3ø 3, 4w 50/60 Hz
BLOWER MOTOR 15 HP
HEAT INPUT 1,125,000 btu/hr
APPR O X. WEIGHT (Uncrated) 5,100 lbs.
93.3 cm x 109.2 cm
283,500 kcal/hr
Gas*Steam*
AIRF LO W 6,500 cfm
INLET PIPE SIZE 1-1/2” F.P.T.
VOLT AG E AVAILA BL E 208-460v 3ø 3, 4w 50/60 Hz
158.75 cm
152.4 cm
3.02 cu. m.
3.73 kw
92.71 cm
0.3 cmh
11.18 kw
2,313 kg
184.06 cmm
BLOWER MOTOR 25 HP
APPR O X. WEIGHT (Uncrated) 5,600 lbs.
AIRF LO W 8,500 cfm
STEAM CONSUMPTION
1,153 lbs/hr
OPERATING STEAM PRESSUR E STEAM SUPPLY STEAM RETURN
125 PSI max
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.
523 kg/hr 35
8.62 bars 2” M.P.T. 1-1/4” M.P.T.
11
BOILER HP
NORMAL LOAD
18.64 kw
2,540 kg
240.69 cmm
B. DIMENSIONS
NOTE: ADC reserves the right to make changes in specifications at any time without notice or
obligation.
12
NOTE: ADC reserves the right to make changes in specifications at any time without notice or
obligation.
13
NOTE: ADC reserves the right to make changes in specifications at any time without notice or
obligation.
14
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. For a detailed description, refer to the
ML-310 Phase 7 Tilting Installation Manual (ADC Part No. 1 13127) 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: IMPROPERL Y SIZED or INST ALLED EXHAUST DUCT WORK CAN
CREA TE A POTENTIAL FIRE HAZARD.
15
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,
requirements of the National Electrical Code ANSI/NFPA NO. 70-LA TEST 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
The dryer installation must meet the American National Standard, National Fuel Gas Code ANSI Z223.1LATEST 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.
ALL electrical connections, materials, and workmanship must conform to the applicable
in this manual can result in personal injury or component failure.
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.
16
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
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
are not directly replaceable. The gas valves need to be modified to use other than the
Johnson (DSI) Control Module P/N 128935
ADC (DSI) Control Module P/N 128973
17
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.
24 VAC Direct Spark Ignition (DSI) Modules
Johnson (DSI) Control Module
P/N 128935
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).
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.
ADC (DSI) Control Module
P/N 128973
Ignitor/Flame-Probe Assembly
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 .
18
Sail Switch Assembly
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.
225º F (107º C) Thermostat
NOTE: THE DIRECT SPARK IGNITION (DSI) GAS
VALVES ARE NOT FIELD REP AIRABLE.
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 [prepur ge]) the indicator will
light “green,” the gas valve opens and the spark burst will be evident (on) for approximately 8seconds. 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 of f
and immediately try to reestablish the burner flame. The DSI module will attempt to light the
burner ONL Y 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.
19
h. Troubleshooting Flowchart - Quick Reference...
First Visual Check
No Spark And System Does Not W ork
Is 24 VAC available
at transformer?
No Yes
Is power available
to primary?
No Yes
Determine why
voltage is not
present.
Replace
Transformer.
Are thermostat contacts and
Reset
or replace
hi-limits
Check continuity of wiring to
determine why voltage does
hi-limit control contacts closed?
No Yes
not exist at THS(2).
Install
Jumper.
Is 24 VAC present from terminal
THS(2) to ground?
No Yes
Is jumper installed
from terminal 5 to
ground?
No Yes
Turn off supply voltage.
Check high voltage cable.
Is it securely attached
to DSI module?
No Yes
Securely attach wire
to DSI module
Open thermostat contacts for 30 seconds.
Close contacts and wait for prepurge (if applicable)
period. Is spark present now?
No Yes
Is condition of high voltage
cable good (not brittle,
burnt, or cracked)?
No Yes
Replace high
voltage cable
Is spark electrode
ceramic cracked
or is electrode
Replace
DSI module
grounded out?
No Yes
Replace spark electrode
assembly.
20
System was in lockout.
Observe a complete operating
cycle to determine why
control locked out.
i. Troubleshooting Flowchart - Quick Reference...
Second Visual Check
Sp ark 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.
between terminals M.V.(3)
Is 24 VAC present
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)
Correctly adjust the
gap and position of
spark ignitor.
Is inlet gas pressure per
manufacturer's specifications?
No Yes
Is spark gap .125 in.(3.175 mm)
and in gas stream?
No Yes
Replace
gas valve.
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j. Troubleshooting Flowchart - Quick Reference...
Third Visual Check
Main Burner Lights But Will Not S t ay On
Is flame sensor cable
securely attached
to sense (4) terminal?
No Yes
Reattach flame
sensor wire to
sense (4) terminal.
Replace
sensor
cable.
Correct or
replace sensor.
Does continuity exist
No Yes
from control
to flame sensor?
Is flame sensor corroded
or is ceramic cracked?
Yes No
Check connection.
Is flame sensor positioned per
manufacturer's specifications?
No Yes
Readjust per
specifications
Replace
DSI module
Does continuity exist in
ground path from burner
to control?
No Yes
Check flame sensing current
during trial. Is current
greater than 0.3
No Yes
µ
A DC?
Replace
DSI module
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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 . OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment
or specified in the ML-310 Phase 7 Tilting Installation Manual (ADC Part No. 1 13127)
included with the dryer .
IMPORTANT: UNDER NO CIRCUMSTANCES SHOULD ANY SAFETY or HEA T
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
Used To Measure Gas Pressure In Inches
Of W ater Column (W.C.)
Flame-Probe Assembly and Spark Electrode
A vailable From ADC
A vailable From ADC
MULTIMETER/VOLTMETER
For Measuring Voltage
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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. INDICA TOR 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 (
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 V AC)
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.]).
THERE ARE NO RETRIES).
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)
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:
is not wrapped around the sensor probe wire (the wire between the DSI module FP
NOTE: Preliminary steps - DO NOT OMIT - to minimize the time required to troubleshoot this
system.
a) Disconnect the electrical power to the dryer.
b) V isually 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 T echnician 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
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 27.
page 29.
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