American Dryer Corp ML-190HS User Manual
ML-190HS
Service Manual
Phase 6
Microprocessor Controls
American Dryer Corporation
88 Currant Road
Fall River, MA 02720-4781
Telephone: (508) 678-9000 / Fax: (508) 678-9447
E-mail: techsupport@amdry.com
112999SL/tcosta ADC Part No. 450410
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/operator's 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.
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.
POUR VOTRE SÉCURITÉ
Ne pas entreposer ni utiliser dessence
ni dautres vapeurs ou liquides
inflammables dans le voisinage de cet
appareil ou de yout autre appareil.
Important
For your convenience, log the following information:
DATE OF PURCH ASE MODEL NO.
DISTRI BUTORS NAM E
Serial Number(s)
ML-190HS
Replacement parts can be obtained from your distributor 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 orders 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
SECTION I
IMPORTANT INFORMATION............................................................................... 3
A. Safety Precautions ...................................................................................................................... 3
SECTION II
ROUTINE MAINTENANCE .................................................................................... 5
A. Cleaning ..................................................................................................................................... 5
B. Adjustments ............................................................................................................................... 6
C. Lubrication ................................................................................................................................. 6
SECTION III
INSTALLATION REQUIREMENTS ...................................................................... 7
A. Enclosure, Air Supply, and Exhaust Requirements ........................................................................ 7
B. Electrical and Gas Requirements ................................................................................................. 7
C. Operational Service Check Procedure ........................................................................................ 8
SECTION IV
DESCRIPTION OF PARTS ................................................................................... 10
A. Control Panel (Microprocessor) ................................................................................................ 10
B. Control Box ............................................................................................................................. 10
C. HSI Module (Gas Models Only) ............................................................................................... 10
D. Gas Burner Assembly ............................................................................................................... 11
E. Drive Motor ............................................................................................................................. 11
F. Blower Motor and Impellor (Gas and Steam) ............................................................................ 11
G. Speed Reducing Shaft ............................................................................................................... 12
H. Tumbler (Basket) Bearing Arrangement ..................................................................................... 12
I. Tumbler (Basket) ...................................................................................................................... 12
J. Main Door Switch .................................................................................................................... 13
K. Sail Switch (Gas Models Only) ................................................................................................. 13
L. Hi-Limit (Gas Models Only) ..................................................................................................... 13
M. Manual Reset Thermostat ......................................................................................................... 14
N. Lint Drawer .............................................................................................................................. 14
O. Lint Drawer Switch ................................................................................................................... 14
P. Steam Damper System ............................................................................................................. 15
Q. Compressed Air Requirements .................................................................................................. 15
SECTION V
SERVICING .............................................................................................................. 16
A. Computer Controls ................................................................................................................... 17
B. Ignition Controls ....................................................................................................................... 18
C. Thermostats .............................................................................................................................. 21
D. Sail Switch Assembly (Gas Models Only).................................................................................. 23
E. Front Panel and Main Door Assemblies ..................................................................................... 23
F. Pulleys ...................................................................................................................................... 25
G. Tumbler (Basket) Alignment ...................................................................................................... 28
H. Bearings ................................................................................................................................... 29
I. Basket and Support .................................................................................................................. 32
J. V-Belts ..................................................................................................................................... 32
K. Motors ..................................................................................................................................... 34
L. Impellor .................................................................................................................................... 35
M. Lint Drawer Assembly .............................................................................................................. 35
SECTION VI
TROUBLESHOOTING ........................................................................................... 37
SECTION VII
ELECTRICAL TROUBLESHOOTING ............................................................... 41
SECTION VIII
PHASE 6 OPL SYSTEM DIAGNOSTICS ...........................................................42
A. Diagnostic (L.E.D. [light emitting diode] Display) Failure Codes ................................................. 42
B. L.E.D. (light emitting diode) Display Indicators .......................................................................... 44
C. Phase 6 OPL Microprocessor Controller Relay Output L.E.D. (light emitting diode) Indicators ... 45
SECTION IX
L.E.D. DISPLAY/CODES ........................................................................................ 46
A. L.E.D. (light emitting diode) Display Operating Status ................................................................ 46
B. Phase 6 OPL Microprocessor L.E.D. (light emitting diode) Displays .......................................... 47
C. L.E.D. Codes ........................................................................................................................... 48
D. Computer Logic and Wiring Diagram ........................................................................................ 49
SECTION X
TECHNICAL INFORMATION .............................................................................. 55
A. Motor Plate (High and Low Voltage) ......................................................................................... 55
B. Data Label ............................................................................................................................... 56
C. Using a Manometer .................................................................................................................. 57
D. Tool List ................................................................................................................................... 58
SECTION I
IMPORTANT INFORMATION
A. SAFETY PRECAUTIONS
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. Dryer must be exhausted to the outdoors.
4. Although ADCs dryer is 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 cleaners.
FIRE or EXPLOSION COULD RESULT.
WARNING: DO NOT dry rags or articles coated with gasoline, kerosene, paint, or wax.
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 tumbler (basket) may damage
plastic or rubber and also may be a fire hazard.
5. A program should be established for the inspection and cleaning of lint in the burner area and exhaust duct
work. The frequency of 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.
6. 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.
NOTE: Failure to do so will VOID THE WARRANTY.
7. UNDER NO CIRCUMSTANCES should the dryer door or lint drawer switch(es) or heat safety devices
ever be disabled.
WARNING: PERSONAL INJURY or FIRE COULD RESULT.
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8. Articles should never be left unattended for an extended period of time in the tumbler (basket) after
completion of the drying and cooling cycles.
WARNING: ARTICLES LEFT IN THE DRYER AFTER THE DRYING and COOLING CYCLES
HAVE BEEN COMPLETED CAN CREATE A FIRE HAZARD.
9. This dryer is not to be used in the presence of dry cleaning solvents or fumes.
10. Read and follow ALL caution and direction labels attached to the dryer.
WARNING: CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON or IN THE DRYER(S).
CHILDREN SHOULD BE SUPERVISED IF NEAR DRYER(S) IN OPERATION.
11. DO NOT operate dryers with more than 125 PSI steam pressure. Excessive steam pressure can damage
steam coil and/or harm personnel.
12. Replace leaking flexible steam hoses or other steam fixtures immediately. DO NOT operate dryer with
leaking flexible hoses. Personal injury may result.
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SECTION II
ROUTINE MAINTENANCE
A. CLEANING
A program and/or 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 OF LINT CAN CREATE A POTENTIAL FIRE HAZARD.
WARNING: KEEP DRYER AREA CLEAR and FREE FROM COMBUSTIBLE
MATERIALS, GASOLINE, and OTHER FLAMMABLE VAPORS and
LIQUIDS.
NOTE: Suggested time intervals shown for average usage which is considered six (6) to eight (8)
operational (running) hours per day.
Clean lint drawer/screen every third or fourth load.
NOTE: Frequency can best be determined at each location.
DAILY
(beginning) of each work shift.
Clean lint from the drawer/screen. Inspect lint screen and replace if torn.
WEEKLY
Clean lint accumulation from lint chamber, thermostat, and microprocessor temperature sensor (sensor bracket)
area.
WARNING: To avoid the hazard of electrical shock, discontinue electrical supply to dryer.
STEAM DRYERS
Clean steam coil fins 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 local air conditioning supply houses.
5
90 DAYS
Remove lint from tumbler (basket), drive motors, and surrounding areas. Remove lint from gas valve burner area
with a dusting brush or vacuum cleaner attachment.
NOTE: To prevent damage, avoid cleaning and/or touching ignitor/flame-probe assembly.
Remove lint accumulation from inside control box and at rear area behind control box.
6 MONTHS
Inspect and remove lint accumulation in customer furnished exhaust duct work system and from dryers internal
exhaust ducting.
WARNING: THE ACCUMULATION OF LINT IN THE EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.
WARNING: DO NOT OBSTRUCT THE FLOW OF COMBUSTION and VENTILATION
AIR. CHECK CUSTOMER FURNISHED BACK DRAFT DAMPER IN
EXHAUST DUCT WORK. INSPECT and REMOVE ANY LINT
ACCUMULATION WHICH CAN CAUSE DAMPER TO BIND or STICK.
NOTE: A back draft damper that is sticking partially closed can result in slow drying and shut down
of the heat circuit safety switches or thermostats.
NOTE: When cleaning dryer cabinet(s), avoid using harsh abrasives. A product intended for the
cleaning of appliances is recommended.
B. ADJUSTMENTS
7 DAYS AFTER INSTALLATION and EVERY 6 MONTHS
Inspect bolts, nuts, screws, (bearing set screws), nonpermanent gas connections (unions, shut-off valves, orifices,
and grounding connections). Motor and drive belts should be examined. Cracked or seriously frayed belts
should be replaced. Tighten loose V-belts when necessary. Complete operational check of controls and valves.
Complete operational check of ALL safety devices (door switch, lint drawer switch, sail switch, burner and hilimit thermostats).
C. LUBRICATION
The motor bearings, idler bearings...and under normal/most conditions the tumbler bearings are permanently
lubricated. It is physically possible to re-lubricate the tumbler bearings if you choose to do so even though this
practice is not necessary. Use Shell Alvania #3 or its equivalent. The tumbler bearings used in the dryer DO
NOT HAVE a great fitting. Provisions are made in the bearing housing for the addition of a grease fitting which
can be obtained elsewhere, or from ADC by ordering kit Part No. 882159, which includes two (2) fittings.
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SECTION III
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:
ANSI Z223.1-LATEST EDITION National Fuel Gas Code
and/or
ANSI/NFPA No. 70-LATEST EDITION National Electrical Code
A. ENCLOSURE, AIR SUPPLY, and EXHAUST REQUIREMENTS
NOTE: The following information is very brief and general. For detailed description, refer to the
ML-190 Installation Manual (ADC P/N 113070).
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 drawer. Also, allowances should be made in the
rear for ease of maintenance. (Refer to appropriate Installation Manual for recommended distances and minimum
allowances required.)
When the dryer is operating, it draws in room air, heats it, passes this air through the tumbler (basket), 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
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 appropriate
Installation Manual for more details.)
CAUTION: IMPROPERLY SIZED or INSTALLED EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.
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, material, and workmanship must conform to
the applicable requirements of the National Electrical Code ANSI/NFPA No. 70-LATEST EDITION.
7
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 gas dryer installation must meet the AMERICAN NATIONAL STANDARD, NATIONAL FUEL GAS
CODE ANSI Z223.1-LATEST EDITION, 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 L.P.) indicated on the dryer data label. If this
information does not agree with the type of gas available, contact the distributor 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, unless elevation requirements
of over 2,000 feet 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 are made by changing the burner orifices. If this adjustment is
necessary, contact the distributor who sold the dryer or contact the factory.
NOTE: Any burner changes must be made by a qualified technician.
C. OPERATIONAL SERVICE CHECK PROCEDURE
1. Turn on electric power to the dryer.
2. To start dryer:
a. Display will read READY.
b. Press E on the keyboard (touchpad) of microprocessor controller (computer).
c. The dryer will start, and the display will show Drying Manual Cycle E, Dry Temp _, Cool Temp_,
30 Min Remain.
NOTE: Pressing keyboard (touchpad) A, B, C, D, and F will also start the dryer. Six (6)
preprogrammed drying cycles (A through F) have been stored in the computers memory.
(Refer to Computer Operators Manual for details.)
3. Make a complete operational check of ALL the operating controls to assure that the timing is correct,
temperature selection switches are functioning, etc.
4. Make a complete operational check of ALL safety-related circuits: door switch(es), hi-limit thermostat, sail
switch, cycling thermostats, etc.
5. For gas dryers a gas pressure test should be taken at the gas valve pressure tap of each dryer to assure that
the water column pressure is correct and consistent.
8
NOTE: Water column pressure requirements (measured at the pressure tap on the gas valve body):
Natural Gas - 3.5 Inches Water Column.
L.P. Gas - 10.5 Inches Water Column.
6. If computer program changes are required, refer to the Phase 6 OPL Operators Manual (ADC Part
No. 113022) for details.
7. The dryer should be operated through one complete cycle to assure that no further adjustments are necessary
and that ALL components are functioning properly.
8. Check the electric service phase sequence. While the dryer is operating, check to see if the blower wheel is
rotating in the proper direction. Looking from the front, the blower wheel should spin in the clockwise (CW)
direction. If so, the phasing is correct. If the phasing is incorrect, reverse two (2) leads at connections L1, L2,
or L3 of power supply to the dryer.
9
SECTION IV
DESCRIPTION OF PARTS
A. CONTROL PANEL (MICROPROCESSOR)
Lifting the control door will reveal the control
panel assembly. Opening the control panel will
allow access to the major components which
include the computer board and keyboard
(touchpad). The keyboard (touchpad) inputs
to the computer what temperature and
program has been selected. The computer
controls the entire operation of the machine.
It accepts inputs and gives outputs to various
parts throughout the machine.
B. CONTROL BOX
Lifting the control door and opening the
computer panel will reveal the control box.
Inside the control box are ALL the electronic
control components. Located on the back of
the control box is the computer. Included in
the control box are the 30-position terminal
block, fuse block, and transformer.
C. HSI MODULE (Gas Models ONLY)
The HSI (Hot Surface Ignition) system consists
of a microprocessor-based control module, along
with an ignitor and flame-probe assembly. This
control utilizes a HSI (Hot Surface Ignition) ignitor
and a rectified flame sensor/probe signal to locally
control ALL basic functions in the gas burner.
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D. GAS BURNER ASSEMBLY
Gas-heated dryers are equipped with a
gas burner assembly consisting of four (4)
burner tubes, gas valve, HSI (Hot Surface
Ignition) ignitor, flame probe, sail switch,
and hi-limit thermostat. The inlet piping
enters through the rear of the dryer on
the left-hand side (viewing from the front)
and runs to the front of the dryer where
the gas valve is located.
E. DRIVE MOTOR
The T.E.F.C. (Totally Enclosed, Fan-Cooled)
drive motor is located approximately in the right
front hand corner of the dryer. It sits on an
adjustable base so that the motor can be easily
adjusted to the left or right. The drive motor is
a 3 HP motor and operates on 208 to 460 volts,
50/60 Hz, 3-phase (3ø).
F. BLOWER MOTOR and IMPELLOR
(GAS and STEAM)
The impellor is shaft driven. The blower motor drives the shaft
on which the impellor is mounted. This enables the impellor to
run at a higher RPM, thereby producing a higher airflow (CFM).
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G. SPEED REDUCING SHAFT
(Viewing from the front of the dryer). The
speed reducing shaft is located on the right
side and is right above the drive motor. The
idler assembly consists of two (2) idler pulleys,
the small and large pulleys. The idlers main
purpose is to reduce the speed and increase
torque provided to the tumbler (basket)
bearing. Also, at the idler assembly, belt tension
can be adjusted.
H. TUMBLER (BASKET)
BEARING ARRANGEMENT
The tumbler (basket) bearing
arrangement is located (viewing from
the rear of the dryer) approximately
at the upper center of the dryer. The
arrangement consists of a bearing cap,
rotational sensor and a flange bearing
which serve to support the tumbler
(basket).
I. TUMBLER (BASKET)
The tumbler (basket) consists of four (4) ribs
and four (4) perforated panels, along with a
front and back, which are welded together as
an assembly. The (tumbler [basket]) also
consists of a trunnion, which supports the
tumbler (basket) in the rear.
12
J. MAIN DOOR SWITCH
The main door switch is located near the main door hinge. When the main door
opens, the switch will also open, preventing the dryer from operating. The main
door switch is a safety device and should never be disabled.
K. SAIL SWITCH (GAS MODELS ONLY)
The sail switch is located on the front of the
burner box. A sail switch consists of a round
damper plate on a lever arm which is in contact
with an electric switch. When the air blower
comes on, it draws air through the gas burner.
This creates a negative pressure inside the
burner box, and this negative pressure pulls in
the round damper and activates the sail switch.
If there is improper airflow, the damper will
not pull in, preventing the burner from starting.
Improper airflow can be caused by improperly designed exhaust ducting where the duct run is too long or has too
many sharp bends in it. It can also be caused by a lack of make-up air.
L. HI-LIMIT (GAS MODELS ONLY)
A hi-limit thermostat is located at the burner.
This is a manual reset disc-type thermostat set
at 330º F. If the flame in the burner should get
too hot, this thermostat will shut off the burner.
This is generally caused by low airflow through
the dryer. The heat will not ignite/fire unless
this manual reset thermostat is reset.
13
M. MANUAL RESET THERMOSTAT
This is located inside the dryer in the lint compartment
above the lint drawer. This thermostat senses the
heated air after it has passed through the tumbler
(basket). If the air temperature gets too hot, the
thermostat will shut off the burner. Tumbler (basket)
and blower will run, but dryer will not heat until this
thermostat is manually reset.
N. LINT DRAWER
The lint drawer is a pullout type and is located
at the bottom of the dryer in the lint
compartment. Simply grab the lint drawer
handle, slide out the drawer, brush off the lint,
and slide the drawer back in. The lint screen
must be kept clean in order for the dryer to
operate properly and efficiently.
O. LINT DRAWER SWITCH
The lint drawer switch is located in the lint
compartment and attached to the side of the
lint drawer track. The lint drawer switch
insures that the dryer will operate only when
the lint drawer is completely closed. This is a
safety device and should never be disabled.
14
P. STEAM DAMPER SYSTEM
The newest type system is called the
steam damper. It is shown to the
right and it uses a piston with
compressed air to open and close
the steam damper which in turn
allows the air to flow either through
the coil for heat, or under the coil
for cool down. Air supply is 80 PSI
(+/- 10 PSI).
Q. COMPRESSED
AIR REQUIREMENTS
The dryer requires an external supply of air
(2.5 cfm @ 80 psi) on the steam models the
air is necessary to operate the damper system.
On both steam, as well as the gas model, the
air is necessary/required for the blower air jet
operation...to clean lint from the impellor/fan
(squirrel cage type).
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