American Dryer Corp Clothes Dryer AD 75HS User Manual
AD-7 5 HS  
(Gas/Electric/Steam)  
In st allat ion Man ual  
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 death.  
Do not store or use gasoline or other flammable vapor  
and liquids in the vicinity of this or any other  
appliance.  
WHAT DO YOU DO IF YOU SMELL GAS  
* Do not try to light any appliance.  
* Do not touch any electrical switch; do not use any phone in your  
building.  
* Clear the room, building or area of all occupants.  
* Immediately call your gas supplier from a neighbor's phone.  
Follow the gas supplier's instructions.  
* If you cannot reach your gas supplier, call the fire department.  
Installation and service must be performed by a qualified installer,  
service agency or the gas supplier.  
American Dryer Corporation  
ADC  
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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.  
CAUTION  
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING  
CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGER-  
OUS OPERATION.  
VERIFY PROPER OPERATION AFTER SERVICING.  
CAUTION  
DRYER(S) SHOULD NEVER BE LEFT UNATTENDED WHILE 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.  
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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.  
IMPORTANT  
PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the  
equipment and/or specified in the installation/operator's manual included with  
the dryer.  
Dryer(s) must not be installed or stored in an area where it will be exposed to  
water and/or weather.  
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Ta ble of Con t en t s  
SECTION I  
IMPORTANT INFORMATION ............................................................................... 3  
A. Receiving and Handling............................................................................................................ 3  
B. Safety Precautions ..................................................................................................................... 4  
SECTION II  
SPECIFICATIONS .................................................................................................... 6  
A. Specifications ............................................................................................................................ 6  
B. Component Identification .......................................................................................................... 8  
SECTION III  
INSTALLATION REQUIREMENTS ................................................................... 10  
A. Location Requirements ........................................................................................................... 10  
B. Unpacking/Setting Up ............................................................................................................. 11  
C. Dryer Enclosure Requirements................................................................................................ 12  
D. Fresh Air Supply ..................................................................................................................... 13  
E. Exhaust Requirements ............................................................................................................ 14  
F. Electrical Information .............................................................................................................. 18  
G. Gas Information ...................................................................................................................... 26  
H. Steam Information ................................................................................................................... 30  
I. Preparation For Operation/Start-up ......................................................................................... 35  
J. Preoperational Tests ................................................................................................................. 36  
K. Preoperational Instructions ...................................................................................................... 38  
L. Shut Down Instructions ........................................................................................................... 39  
SECTION IV  
SERVICE/PARTS INFORMATION ..................................................................... 40  
A. Service .................................................................................................................................... 40  
B. Parts......................................................................................................................................... 40  
SECTION V  
WARRANTY INFORMATION ............................................................................. 41  
A. Returning Warranty Card(s) .................................................................................................... 41  
B. Parts......................................................................................................................................... 41  
C. Returning Warranty Card(s) .................................................................................................... 41  
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SECTION VI  
ROUTINE MAINTENANCE ................................................................................. 43  
A. Cleaning .................................................................................................................................. 43  
B. Adjustments ............................................................................................................................. 45  
SECTION VII  
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT  
COMPONENTS ....................................................................................................... 46  
SECTION VIII  
REVERSING TIMER SPIN/DWELL ADJUSTMENTS ................................... 49  
SECTION IX  
TECHNICAL INFORMATION ............................................................................. 50  
Data Label..................................................................................................................................... 51  
SECTION X  
TROUBLESHOOTING ............................................................................................52  
Microprocessor (Computer) Models.............................................................................................. 54  
Dual Timer Models ....................................................................................................................... 64  
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SECTION I  
IMPORTANT INFORMATION  
A. RECEIVING and HANDLING  
The dryer is shipped in a protective stretch wrap cover with protective cardboard corners and top cover (or  
optional box) as a means of preventing damage in transit. Upon delivery, the dryer and/ or packaging, and  
wooden skid should be visually inspected for shipping damage. If any damage whatsoever is noticed, inspect  
further before delivering carrier leaves.  
Dryersdamaged in shipment.  
1. ALL dryersshould be inspected upon receipt and before they are signed for.  
2. If there is suspected damage or actual damage, the trucker's receipt should be so noted.  
3. If the dryer is damaged beyond repair, it should be refused. Those dryers which were not damaged in a  
damaged shipment should be accepted, but the number received and the number refused must be noted  
on the receipt.  
4. If you determine that the dryer was damaged after the trucker has left your location, you should call the  
delivering carrier's freight terminal immediately and file a claim. The freight company considers this  
concealed damage. This type of freight claim is very difficult to get paid and becomes extremely difficult  
when more than a day or two passes after the freight was delivered. It is your responsibility to file freight  
claims. Dryer/ partsdamaged in transit cannot beclaimed under warranty.  
5. Freight claims are the responsibility of the consignee, and ALL claims must be filed at the receiving end.  
ADC assumes no responsibility for freight claims or damages.  
6. If you need assistance in handling the situation, please contact the ADC Traffic Manager at (508) 678-9000.  
IMPORTANT: Thetumbler section ofthedryer must betransported and handled in an upright  
position at all times.  
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B. SAFETY PRECAUTIONS  
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. PERSONALINJURY 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, wax.  
EXPLOSION COULD RESULT.  
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 rubber materials. Drying in a heated basket (tumbler) may  
damage plastics or rubber and also may be a fire hazard.  
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7. A program should be established for the inspection and cleaning of lint in the heating unit area, exhaust  
duct work, and inside 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 Electric Code ANSI/NFPA NO. 70-LATEST EDITION.  
NOTE: Failure to do so will VOID THE WARRANTY.  
9. UNDER NO CIRCUMSTANCES should the dryer door switches 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. DO NOT operate steam dryers with more than 125 PSI steam pressure. Excessive steam pressure can  
damage steam coil and/or harm personnel.  
13. Replace leaking flexible hoses or other steam fixtures immediately. DO NOT operate the dryer with  
leaking flexible hoses. PERSONAL INJURY MAY RESULT.  
14. The normal PH level for copper type steam coils must be maintained between a value of 8.5 to 9.5. For  
steel type steam coils the PH level must be maintained between a value of 9.5 to 10.5. These limits are set  
to limit the acid attack of the steam coils.  
IMPORTANT: Coil failure due to improper PH level will VOID THE WARRANTY.  
15. 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 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.  
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SECTION II  
SPECIFICATIONS/COMPONENT IDENTIFICATION  
A. SPECIFICATIONS  
*
For non-reversing models.  
** A minimum of 3/4" pipe must be supplied to the gas inlet for each dryer.  
IMPORTANT: Steam dryers must be provided with clean, dry, regulated 80 PSI (+/- 10 psi) air supply.  
NOTE: ADC reserves the right to make changes in specifications at any time, without notice or  
obligation.  
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Specifications  
ADG-75HS  
ADE-75  
ADS-75  
NOTE: ADC reserves the right to make changes in specifications at any time, without notice or  
obligation.  
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B. COMPONENT IDENTIFICATION  
1. Dryer Front View  
Illus. No.  
Description  
1
2
3
4
5
Controls  
Control (top access) Door Assembly  
Main Door Assembly  
Lint Compartment Area (lint screen located behind door)  
Data Label and Installation Label (located behind control [service] door)  
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2. Dryer Rear View  
Illus. No.  
Description  
1
2
Heating Unit  
1/8" Compressed Air Supply Inlet  
(behind Electric Service Relay Box for steam units Only)  
Electric Service Relay Box  
Tumbler Bearing Mount Assembly  
Idler Bearing Mount Assembly  
Blower Motor Assembly  
3*  
4
5
6
7
Leveling Leg (rear)  
8
9
Basket (Drive) Motor Assembly (Reversing Models Only)  
Dryer Exhaust  
* Electric service connections for Gas Models and Steam Models are made in this box.  
NOTE: 1/8-inch Compressed Air Supply Inlet (for Steam Models Only) is located behind the  
Electric Service Relay Box.  
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SECTION III  
INSTALLATION PROCEDURES  
Installation should be performed by competent technicians in accordance with local and state codes. In the  
absence of these codes, the installation must conform to applicable American National Standards: National  
Fuel Gas Code ANSI.Z223.1-LATEST EDITION and/or National Electric Code ANSI/NFPA NO. 70-LATEST  
EDITION.  
A. LOCATION REQUIREMENTS  
Before installing the dryer, be sure the location conforms to local codes and ordinances. In the absence of such  
codes or ordinances the location must conform with the National Fuel Gas Code ANSI.Z223.1-LATEST  
EDITION.  
1. The dryer must be installed on a sound level floor capable of supporting its weight. It is recommended that  
carpeting be removed from the floor area that the dryer is to rest on.  
2. The dryer must not be installed or stored in an area where it will be exposed to water and/or weather.  
3. The dryer is for use in noncombustible locations.  
4. Provisions for adequate air supply must be provided as noted in this manual (refer to Fresh Air Supply in  
Section D).  
5. Clearance provisions must be made from combustible construction as noted in this manual (refer to Dryer  
Enclosure Requirements in Section C).  
6. Provisions must be made for adequate clearances for servicing and for operation as noted in this manual  
(refer to Dryer Enclosure Requirements in Section C).  
7. Dryer must be exhausted to the outdoors (refer to Exhaust Requirements in Section E).  
8. Dryer must be located in an area where correct exhaust venting can be achieved as noted in the manual  
(refer to Exhaust Requirements in Section E).  
IMPORTANT: Dryer should be located where a minimum amount of exhaust duct will be  
necessary.  
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B. UNPACKING/SETTING UP  
Remove protective shipping material (i.e., plastic wrap, and/or optional shipping box) from dryer.  
IMPORTANT: Dryer must be transported and handled in an upright position at all times.  
The dryer can be moved to its final location while still attached to the skid or with the skid removed. To un-skid  
the dryer, locate and remove the four (4) bolts securing the base of the dryer to the wooden skid. Two (2) are at  
the rear base (remove the back panel for access), and two (2) are located in the bottom of the lint chamber. To  
remove the two (2) bolts located in the lint chamber area, remove the lint door.  
With the skid removed, to make it easier to slide the dryer into its final position, slightly lower ALL four (4)  
leveling legs, so that the dryer will slide on the legs instead of the base frame.  
To increase bearing life and improve efficiency, the dryer should be tilted slightly to the rear.  
The lint coops of ALL AD-75 dryers are supported during shipping by a bracket. REMOVE THIS BRACKET  
BEFORE STARTING THE DRYER.  
1. Leveling Dryer  
The dryer is equipped with four (4) leveling legs, one at each corner of the base. Two (2) are located at the  
rear of the dryer base, and two (2) are located in the lint chamber (coop). To increase bearing life and  
improve efficiency, the dryer should be tilted slightly to the rear.  
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C. DRYER ENCLOSURE REQUIREMENTS  
Bulkheads and partitions should be made of noncombustible materials and must be located a minimum of  
12-inches (18-inches or more is recommended for ease of installation, maintenance , and service) above the  
dryer outer top, except along the front of the dryer which may be partially closed in if desired. The clearance  
between the bulkhead header and the dryer must be a minimum of four (4) inches and must not extend more  
than four (4) inches to the rear of the front. The bulkhead facing must not be closed in all the way to the top of  
the dryer. A one (1) inch clearance is required.  
NOTE: Allowances must be made for opening the control door.  
Dryers may be positioned side wall to side wall. However, a 1/16" minimum allowance must be made for  
opening and closing of the control door and the lint door. It is suggested that the dryer be positioned about two  
(2) feet away from the nearest obstruction for ease of installation, maintenance, and service (to be measured  
from the back guard.) (Refer to the illustration above for details.)  
NOTE: Air considerations are important for proper and efficient operation.  
IMPORTANT: Even though a minimum of only 12-inches is required, 18-inches or more is  
suggested. The additional clearance is advantageous for ease of installation and  
service.  
IMPORTANT: When fire sprinkler systems are located above the dryers, a minimum of  
18-inches above the dryer console (module) is required. Dryers may be  
positioned side wall to side wall however, a 1/16-inch minimum allowance is  
required between dryers (or wall) for ease of installation and maintenance.  
Allowances must be made for the opening and closings of the control door and  
the lint door.  
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D. FRESH AIR SUPPLY  
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 may result, as well as premature motor failure from overheating.  
Air supply (make-up air) must be given careful consideration to assure proper performance of each dryer. An  
unrestricted source of air is necessary for each dryer. An air flow of 1,200 cfm (cubic feet per minute) must be  
supplied to each gas and electric dryer and 1,350 cfm (cubic feet per minute) must be supplied to each steam  
dryer. As a general rule, an unrestricted air entrance from the outdoors (atmosphere) of a minimum of 1-1/2  
square feet is required for each dryer.  
To compensate for the use of registers or louvers used over the openings, this make-up air must be increased by  
approximately thirty-three percent (33%). Make-up air openings should not be located in an area directly near  
where exhaust vents exit the building.  
It is not necessary to have a separate make-up air opening for each dryer. Common make-up air openings are  
acceptable. However, they must be set up in such a manner that the make-up air is distributed equally to ALL  
the dryers.  
EXAMPLE: For a bank of four (4) dryers, two (2) unrestricted openings measuring 2 feet by 1-1/2 feet  
(6 square feet) is acceptable.  
Allowances must be made for remote or constricting passageways or where dryers are located at excessive  
altitudes or predominantly low pressure areas.  
IMPORTANT: Make-up air must be provided from a source free of dry cleaning solvent fumes.  
Make-up air that is contaminated by dry cleaning solvent fumes will result in  
irreparable damage to motors and other dryer components.  
NOTE: Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY.  
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E. EXHAUST REQUIREMENTS  
1. General Exhaust Duct Work Information  
Exhaust duct work should be designed and installed by a qualified professional. Improperly sized duct  
work will create excessive back pressure which results in slow drying, increased use of energy, overheating  
of the dryer, and shutdown of the burner by the airflow (sail) switches, burner hi-limits, or basket (tumbler)  
hi-heatthermostats.  
CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.  
CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUST DUCT WORK CAN  
CREATE A POTENTIAL FIRE HAZARD.  
The duct work should be laid out in such a way that the duct work travels as directly as possible to the  
outdoors with as few turns as possible. Single or independent dryer venting is recommended.  
HORIZONTAL VENTING:  
When single dryer venting is used, the length of duct work, from the dryer to the outside exhaust outlet, should  
not exceed fifteen (15) feet. The minimum diameter of this duct work must be at least 10-inches (even though  
the dryer exhaust duct for gas and electric units is only 8-inches). In the case of multiple (common) dryer  
venting, the distance from the last dryer to the outside exhaust outlet should not exceed fifteen (15) feet. The  
shape of the duct work is not critical so long as the minimum cross-sectional area is provided. It is suggested  
that the use of 90° turns be avoided; use 30° and/ or 45° angles instead. The radius of the elbows should  
preferably be 1-1/ 2 times the diameter of the duct. Including basket (tumbler)/ dryer elbow connections or  
elbowsused for outsideprotection from theweather, nomorethan two(2)elbowsshould be used in theexhaust  
duct run. If more than two (2) elbows are used, the cross sectional area of the duct work must be increased.  
ALL duct work should be smooth inside with no projections from sheet metal screws or other obstructions  
which will collect lint. When adding ducts, the duct to be added should overlap the duct to which it is to be  
connected. ALL duct work joints must be taped to prevent moisture and lint from escaping into the building.  
Inspection doors should be installed at strategic points in the exhaust duct work for periodic inspection and  
clean-out of lint from the duct work.  
VERTICAL VENTING:  
When singledryer venting isused thelength oftheductwork from thedryer totheoutsideexhaustoutlet should  
not exceed twenty (20) feet. The minimum diameter of this duct work must be at least 12-inches (even though  
the dryer exhaust duct for gas and electric units is only 8-inches) In the case of multiple (common) dryer  
venting, the distance from the last dryer to the outside exhaust outlet should not exceed twenty (20) feet. The  
shape of the duct work is not so critical so long as the minimum cross sectional area is provided. It is suggested  
that the use of 90º turns be avoided; use 30º and/ or 45º bends instead.. The radius of the elbows should  
preferably be 1-1/ 2 times the diameter of the duct. ALL duct work should be smooth inside with no  
projections from sheet metal screws or other obstructions which will collect lint. When adding ducts, the duct  
to be added should overlap the duct to which it is to be connected. ALL duct work joints must be taped to  
prevent moisture and lint from escaping into the building. Inspection doors should be installed at strategic  
points in the exhaust duct work for periodic inspection and clean-out of lint from the duct work.  
IMPORTANT: Exhaustbackpressuremeasured byamanometerin theexhaustduct shouldnot  
exceed 0.3-inches of water column.  
IMPORTANT: Minimum duct work diameter for horizontal venting is 10-inches and for  
vertical venting the minimum is 12-inches.  
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NOTE: Where the exhaust duct work passes through a wall, ceiling, or roof made of combustible  
materials, the opening must be 2-inches larger (all the way around) than the duct. The  
duct must be centered within this opening.  
a. OutsideDuct Work Protection  
1) To protect the outside end of horizontal duct work from the weather, a 90° elbow bent downward  
should be installed where the exhaust exits the building. If the duct work travels vertically up  
through the roof, it should be protected from the weather by using a 180° turn to point the opening  
downward. In either case, allow at least twicethediameter oftheduct between theduct opening and  
thenearest obstruction.  
IMPORTANT: DO NOTuse screens or caps on the outside of opening of exhaust duct work.  
2. Single Dryer Venting  
Wherepossible, it issuggested to providea separateexhaust duct for each dryer. Theexhaust duct should  
be laid out in such a way that the duct work travels as directly as possible to the outdoors with as few turns  
as possible. It is suggested that the use of 90° turns in the ducting be avoided; use 30° and/ or 45° angles  
instead. The shape of the exhaust duct work is not critical so long as the minimum cross section area is  
provided.  
IMPORTANT: Minimum duct size for a dryer that is vented horizontally is 10-inches for a  
round duct or an equivalent of 80 square inches. THE DUCT SIZE MUST  
NOT BE REDUCED ANYWHERE DOWN STREAM OF THE DRYER.  
IMPORTANT: Exhaust back pressuremeasured by a manometer at each basket (tumbler)  
exhaust duct area should not exceed 0.3-inches of water column.  
IMPORTANT: Minimum duct size for a dryer that is vented vertically is 12-inches for a round  
duct or an equivalent of 120 square inches. THE DUCT SIZE MUST NOT  
BE REDUCED ANYWHERE DOWN STREAM OF THE DRYER.  
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IMPORTANT: For extended duct work runs, the cross section area of the duct work can only be  
increased to an extent. When the duct work approaches the maximum limits  
noted in this manual, a professional heating venting air conditioning (HVAC)  
firm should be consulted for proper venting information.  
ALL duct work should be smooth inside with no projections from sheet metal screws or other obstructions  
which will collect lint. When adding ducts, the duct to be added should overlap the duct to which it is to be  
connected. ALL duct work joints must be taped to prevent moisture and lint from escaping into the  
building. Inspection doors should be installed at strategic points in the exhaust duct work for periodic  
inspection and clean-out of lint from the duct work.  
NOTE: Where the exhaust duct passes through a wall, ceiling, or roof made of combustible  
materials, the opening must be 2-inches larger (all the way around) than the duct. The  
duct must be centered within this opening.  
a. Outside Duct Work Protection  
1) To protect the outside end of horizontal duct work from the weather, a 90° elbow bent downward  
should be installed where the exhaust exits the building. If the duct work travels vertically up  
through the roof, it should be protected from the weather by using a 180° turn to point the opening  
downward. In either case, allow at least twice the diameter of the duct between the duct opening and  
the nearest obstruction.  
IMPORTANT: DO NOT use screens or caps on the outside of opening of exhaust duct work.  
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F. ELECTRICAL INFORMATION  
1. Electrical 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.  
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.  
NOTE: Component failure due to improper installation will VOID THE WARRANTY.  
Each dryer should be connected to an independently protected branch circuit. The dryer must be connected  
with copper wire only. DO NOT use aluminum wire which could cause a fire hazard. The copper conductor  
wire/cable must be of proper ampicity and insulation in accordance with electric codes for making ALL  
service connections.  
NOTE: The use of aluminum wire will VOID THE WARRANTY.  
IMPORTANT: A separate circuit servicing each dryer must be provided.  
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2. Electrical Service Specifications  
a. Gas and Steam Models ONLY  
ADG-7 5 HS (GAS)  
ADS-7 5 (STEAM)  
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IMPORTANT: Figures shown are for Non-Reversing Models ONLY. For reversing models  
contact the factory.  
IMPORTANT: The dryer must be connected to the electric supply shown on the data label that  
is affixed to the back side of the upper/top control door. In the case of 208 VAC  
or 230/240 VAC, the supply voltage must match the electric service  
specifications of the data label exactly.  
IMPORTANT: The wire size must be properly sized to handle the related current.  
WARNING: 208 VAC and 230/240 VAC ARE NOT THE SAME. Any damage done to dryer  
components due to improper voltage connections will automatically VOID THE  
WARRANTY.  
NOTE: ADC reserves the right to make changes in specifications at any time, without notice or  
obligation.  
19  
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b. Electric Models ONLY  
ADE-7 5 (ELECTRIC)  
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IMPORTANT: Figures shown are for Non-Reversing Models ONLY. For reversing models  
contact the factory.  
IMPORTANT: The dryer must be connected to the electric supply shown on the data label that  
is affixed to the back side of the upper/top control door. In the case of 208 VAC  
or 230/240 VAC, the supply voltage must match the electric service  
specifications of the data label exactly.  
IMPORTANT: The wire size must be properly sized to handle the related current.  
WARNING: 208 VAC and 230/240 VACARE NOT THE SAME. Any damage done to dryer  
components due to improper voltage connections will automatically VOID THE  
WARRANTY.  
NOTE: 3-Phase (3ø) figures shown are for three (3) wire service ONLY.  
NOTE: ADC reserves the right to make changes in specifications at any time, without notice or  
obligation.  
20  
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3. Grounding  
A ground (earth) connection must be provided and installed in accordance with state and local codes. In the  
absence of these codes, grounding must conform to applicable requirements of the National Electric Code  
ANSI/NFPA NO. 70-LATEST EDITION. The ground connection may be to a proven earth ground at the  
location service panel.  
For added personal safety, when possible, it is suggested that a separate ground wire (no. 18 minimum) be  
connected from the ground connection of the dryer to a grounded cold water pipe. DO NOT ground to a  
gas pipe or hot water pipe. The grounded cold water pipe must have metal to metal connection all the way  
to the electrical ground. If there are any non-metallic interruptions, such as, a meter, pump, plastic, rubber, or  
other insulating connectors, they must be jumped out with no. 4 copper wire and securely clamped to bare  
metal at both ends.  
IMPORTANT: For personal safety and proper operation, the dryer must be grounded.  
Provisions are made for ground connection in each dryer at the electrical service connection area.  
4. Electrical Connections  
NOTE: A wiring diagram is located in the front electrical control box for connection data.  
a. Gas and Steam Models ONLY  
NOTE: A CIRCUIT SERVING EACH DRYER MUST BE PROVIDED.  
1) Single Phase (1ø) Wiring Connections/Hookup  
The electrical connections on ALL single-phase (1ø) gas dryers and steam dryers are made into the  
rear service box located at the upper left area of the dry  
21  
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Actual electrical wire connections are made to the L1 and L2 terminals of the motor contactor located  
in the rear service box mentioned above. The ground connection is also made to the copper lug also  
provided in this box.  
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If local codes permit, power to the dryer can be made by the use of a flexible U.L. listed power cord/  
pigtail (wire size must conform to rating of dryer), or the dryer can be hard wired directly to the  
service breaker panel. In both cases, a strain relief must be installed where the wiring enters the  
dryer.  
2) 3-Phase (3ø) Wiring Connections/Hookup (for Non-Reversing Models Only)  
The electrical connections on ALL 3-phase (3ø) gas and steam dryers are made into the rear service  
box located at the upper left area of the dryer. Electrical connections for electrically heated dryers  
are made in the electric oven area located at the upper rear area of the dryer.  
NOTE: A CIRCUIT SERVING EACH DRYER MUST BE PROVIDED.  
If local codes permit, power to a gas or steam dryer can be made by the use of a flexible U.L. listed  
power cord/pigtail (wire size must conform to rating of dryer), or the dryer can be hard wired  
directly to the service breaker panel. In ALL cases, a strain relief must be installed where the wiring  
enters the dryer.  
22  
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The only electrical input connections to the dryer are the 3-phase (3ø) power leads (L1, L2, L3, and  
sometimes neutral) and ground. Single-phase (1ø) power for the control circuit is done internally to  
the dryer. No single-phase (1ø) input connection is required on a 3-phase (3ø) dryer.  
For gas and steam dryers manufactured for operation at 3-phase (3ø), the electrical connections are  
made at the power distribution block located in the service box at the rear, upper left corner of the  
dryer. The ground connection is made to the copper lug also provided in this box. To gain access to  
the service box contactor, the service box cover must be removed.  
23  
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3) 3-Phase (3ø) Wiring Connections/Hookup (for Reversing Models Only)  
The electrical connections on ALL 3-phase (3ø) gas dryers and steam dryers are made into the rear  
service box located at the upper left area of the dryer. Electrical connections for electrically heated  
dryers are made in the electric oven area located at the upper rear area of the dryer.  
IMPORTANT: A separate circuit serving each dryer must be provided.  
If local codes permit, power to a gas or steam dryer can be made by the use of flexible U.L. listed  
power cord/pigtail (wire size must conform to rating of dryer), or the dryer can be hard wired  
directly to the service breaker panel. In ALL cases, a strain relief must be installed where the wiring  
enters the dryer.  
The only electrical input connections to the dryer are the  
3-phase (3ø) power leads (L1, L2, L3, and sometimes neutral)  
and ground. Single-phase (1ø) power for the control circuit is  
done internally to the dryer. No single-phase (1ø) input  
connection is required on a three phase (3ø) dryer.  
For gas dryers and steam dryers manufactured for operation at  
3-phase (3ø), the electrical connections are made at the power  
distribution block located in the service box at the rear, upper  
left corner of the dryer. The ground connection is made to the  
copper lug also provided in this box. To gain access to the  
service box contactor, the service box cover must be removed.  
24  
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b. Electrically Heated Models ONLY  
The only electrical input connections to the dryer are the 3-phase (3ø) power leads (L1, L2, L3, and  
sometimes neutral) and ground. Single-phase (1ø) power for the control circuit and for any single-  
phase (1ø) motors (if present) is done internally to the dryer by the factory at the oven contactor.  
No single-phase (1ø) input connection is required on a 3-phase (3ø) dryer.  
CAUTION: THE DRYER MUST BE GROUNDED. Aground lug has been provided for this  
purpose.  
Input connection wiring must be sized properly to handle the dryer's current draw. This information is  
printed on the dryers data label.  
IMPORTANT: A separate circuit serving each dryer must be provided.  
The electrical input connections are made at the electric oven contactor located inside the assembly at the  
rear center upper section of the dryer. The ground connection is made to a copper lug also provided in this  
area. To gain access, remove oven rear service cover.  
IMPORTANT: Astrain relief must be used where the input wiring enters the oven assembly.  
25  
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G. GAS INFORMATION  
It is your responsibility to have ALL plumbing connections made by a qualified professional to assure that the gas  
plumbing installation is adequate and conforms with local and state regulations or codes. In the absence of such  
codes, ALL plumbing connections, materials, and workmanship must conform to the applicable requirements of  
the National Fuel Gas Code ANSI Z223.1-LATEST EDITION.  
IMPORTANT: Failure to comply with these codes or ordinances, and/or the requirements stipulated  
in this manual, CAN RESULT IN PERSONALINJURYand IMPROPER  
OPERATION OF THE DRYER.  
The dryer and its individual shut-off valves must be disconnected from the gas supply piping system during any  
pressure testing of that system at test pressures in excess of 1/2 psig (3.5 kPa). The dryer must be isolated from  
the gas supply piping system by closing its individual manual shut-off valve during any pressure test of the gas  
supply system at test pressures equal to or less than 1/2 psig (3.5 kPa).  
IMPORTANT: Failure to isolate or disconnect the dryer from supply as noted can cause irreparable  
damage to the gas valve which will VOIDTHE WARRANTY.  
WARNING: FIRE or EXPLOSION COULD RESULT.  
1. Gas Supply  
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  
professional.  
NOTE: Undersized gas piping will result in ignition problems, slow drying, increased use of energy, and  
can create a safety hazard.  
The dryer must be connected to the type of heat/gas indicated on the dryer label affixed behind the right  
control box door. If this information does not agree with the type of gas available, DO NOT operate the  
dryer. Contact the distributor who sold the dryer or the ADC factory.  
IMPORTANT: Any burner changes or conversions must be made by a qualified professional.  
The 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 or conversion of dryers in the field for elevations over 2,000 feet are made by changing each  
burner orifice. If this conversion is necessary, contact the distributor who sold the dryer or contact the ADC  
factory.  
26  
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2. Technical Gas Data  
a. Gas Specifications  
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b. Gas Connections:  
Inlet connection ------------ 3/4-inch N.P.T.  
Inlet supply size ------------ 3/4-inch N.P.T. (minimum)  
Btu/hr input (per dryer) --- 200,000  
1) Natural Gas  
Regulation is controlled by the dryer's gas valve's internal regulator. Incoming supply pressure must  
be consistent between a minimum of 6.0 inches and a maximum of 12.0 inches water column  
(W.C.) pressure.  
2) Liquid Propane (L.P.) Gas  
Dryers made for use with L.P. (liquid propane) gas have the gas valve's internal pressure regulator  
blocked open so that the gas pressure must be regulated upstream of the dryer. The pressure  
measured at each gas valve pressure tap must be a consistent 11.0 inches water column (W.C.).  
There is no regulator or regulation provided in an L.P. dryer. The water column (W.C.) pressure must  
be regulated at the source (L.P. tank) or an external regulator must be added to each dryer.  
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* D.M.S. (Drill Material Size of equivalents are as follows:)  
Natural Gas ................... #29 = .1360"  
Liquid Propane Gas ....... #47 = .0785"  
27  
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3. Piping/Connections  
ALL components/materials must conform to National Gas Code specifications. It is important that gas  
pressure regulators meet applicable pressure requirements and that gas meters be rated for the total amount  
of ALL the appliance BTU's being supplied.  
The dryer is provided with a 3/4" N.P.T. inlet pipe connection located at the right side of the base of the dryer.  
The minimum pipe size (supply line) to the dryer is 3/4" N.P.T. For ease in servicing, the gas supply line of  
each dryer must have its own shut-off valve.  
The size of the main gas supply line (header) will vary depending on the distance this line travels from the gas  
meter or, in the case of L.P. (liquid propane) gas, the supply tank, other gas-operated appliances on the same  
line, etc. Specific information regarding supply line size should be determined by the gas supplier.  
NOTE: Undersized gas supply piping can create a low or inconsistent pressure which will result in  
erratic operation of the burner ignition system.  
28  
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Consistent gas pressure is essential at ALL gas connections. It is recommended that a 3/4-inch pipe gas loop  
be installed in the supply line serving a bank of dryers. An in-line pressure regulator must be installed in the  
gas supply line (header) if the (natural) gas pressure exceeds 12.0 inches of water column (W.C.) pressure.  
NOTE: Awater column (W.C.) test pressure of 3.5 - 4.0-inches for natural gas and 11.0-inches for  
L.P. (liquid propane) dryers is required at the gas valve pressure tap of each dryer for proper  
and safe operation.  
A 1/8" N.P.T. plugged tap, accessible for a test gauge connection, must be installed in the main gas supply  
line immediately upstream of each dryer.  
IMPORTANT: Pipe joint compounds that resist the action of natural gas and L.P. gas must be used.  
IMPORTANT: Test ALL connections for leaks by brushing on a soapy water solution (liquid  
detergent works well).  
WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!!  
ALL components/materials must conform to National Gas Code specifications. It is important that gas  
pressure regulators meet applicable pressure requirements and that gas meters be rated for the total amount  
of ALL the appliance BTU's being supplied.  
IMPORTANT: The dryer and its individual shut-off valve must be disconnected from the gas supply  
piping system during any pressure testing of that system at test pressures in excess of  
1/2 psig (3.5 kPa).  
NOTE: The dryer must be isolated from the gas supply piping system by closing its individual manual  
shut-off valve during any pressure test of the gas supply system at test pressures equal to or  
less than 1/2 psig (3.5 kPa).  
29  
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H. STEAM INFORMATION  
It is your responsibility to have ALL plumbing connections made by a qualified professional to assure that the  
steam plumbing installation is adequate and conforms with local and state regulations or codes.  
IMPORTANT: Failure to comply with the requirements stipulated in this manual can result in  
component failure which willVOIDTHEWARRANTY.  
NOTE: The ADS-75 is manufactured with a pneumatic (piston) damper system which requires an  
external supply of air (80 PSI +/- 10 PSI).  
1. Steam Coil PH Level  
The normal PH level for copper type steam coils must be maintained between a value of 8.5 to 9.5. For  
steel type steam coils the PH level must be maintained between a value of 9.5 to 10.5. These limits are set  
to limit the acid attack of the steam coils.  
IMPORTANT: Coil failure due to improper PH level will VOIDTHE WARRANTY.  
2. Steam Requirements - High Pressure  
Inlet -------- 1" supply line connection -- qty. one (1) at top manifold  
Return ----- 1" return line connection --- qty. one (1) at top manifold  
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3. Installation Instructions  
To insure an adequate supply of steam is provided, be sure that the steam lines and steam return lines are  
sized and laid out as stipulated in this manual. Inadequate steam lines and steam return lines or improper  
steam plumbing will result in poor performance and can cause component failure. Clean, dry steam must be  
provided to the dryer.  
IMPORTANT: Steam coil failure due to water hammer by wet steam will VOIDTHEWARRANTY.  
a. The pressure of the condensate in the steam supply will cause water hammer and subsequent heat  
exchanger (steam coil) failure. The steam supply connection into the main supply line must be made with  
a minimum 10-inch riser. This will prevent any condensate from draining towards the dryer.  
b. The steam supply piping to the dryer must include a 12-inch rise along with a drip trap and check valve.  
This will prevent any condensate from entering the steam coil.  
30  
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c. Flexible hoses or couplings must be used. The dryer vibrates slightly when it runs and this will cause the  
steam coil connections to crack if they are hard piped to the supply and return mains.  
d. Shut-off valves for each dryer should be installed in the supply line, return line, and drip trap return line.  
This will allow the dryer to be isolated from the supply main and the return main if the dryer needs  
maintenance work.  
e. Install an inverted bucket steam trap and check valve at least 12-inches below the steam coil as close to  
the coil as possible.  
1) A trap with capacity of 700 pounds of condensate per hour at 125 psi is needed for each unit.  
f. The supply line and the return line should be insulated. This will save energy and provide for the safety  
of the operator and maintenance personnel.  
g. Water pockets in the supply line, caused by low points, will provide wet steam to the coil possibly causing  
steam coil damage. ALL horizontal runs of steam supply piping should be pitched 1/4-inch for every one  
(1) foot back towards the steam supply header causing the condensate in the line to drain to the header.  
Install a bypass trap in any low point to eliminate wet steam.  
IMPORTANT: Flexible hose/coupling must be used. Coil Failure due to hard plumbing connections  
will VOID THEWARRANTY.  
31  
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3. Steam Damper Air System Connections  
The ADS-75 is manufactured with a pneumatic (piston) damper system which requires an external supply of  
compressed air. The air connection is made to the steam damper solenoid valve which is located at the rear  
inner top area of the dryer just in front of the electric service relay box.  
a. Air Requirements  
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b. Air Connection  
Air connection to system --- 1/8-inch N.P.T.  
c. No air regulator or filtration is provided with the dryer. External regulation/filtration of 80 psi must be  
provided. It is suggested that a regulator/filter gauge arrangement be added to the compressed air line just  
before the dryer connection. This is necessary to insure that correct and clean air pressure is achieved.  
32  
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4. Steam Damper System Operation  
The ADS-75 steam damper shown in Diagram 1 in the illustration below, allows the coil to stay constantly  
charged eliminating repeated expansion and contraction. When the damper is opened, the air immediately  
passes through the already hot coil, providing instant heat to start the drying process. When the damper is  
closed, ambient air is drawn directly into the tumbler, allowing a rapid cool down (Diagram 2).  
Diagram 1 shows the damper in the heating (open) mode, allowing heat into the tumbler.  
Diagram 2 shows the damper in the cool down (closed) mode, pulling ambient air directly into the tumbler  
without passing through the coils.  
NOTE: With the dryer off or with no air supply, the steam damper is in cool down mode as shown in  
Diagram 2.  
33  
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5. Steam Damper Air Piston (Flow Control) Operation Adjustment  
Although the steam damper operation was tested and adjusted prior to shipping at 80 PSI, steam damper  
operation must be checked before the dryer is put into operation. Refer to the previous page (page 33)  
for instructions to check steam damper operation. If steam damper adjustment is necessary, locate the flow  
control valve and make the necessary adjustments as noted below.  
34  
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I. PREPARATION FOR OPERATION/START-UP  
The following items should be checked before attempting to operate the dryer:  
1. Read ALL "CAUTION," "WARNING," and "DIRECTION" labels attached to the dryer.  
2. Check incoming supply voltage to be sure that it is the same as indicated on the dryer data label affixed to the  
back side of the top front control/service door. In the case of 208 VAC or 230/240 VAC, THE SUPPLY  
VOLTAGE MUST MATCH THE ELECTRIC SERVICE EXACTLY.  
3. GAS MODELS - check to assure that the dryer is connected to the type of heat/gas indicated on the dryer  
data label.  
4. GAS and ELECTRIC MODELS - the sail switch damper assembly was installed and adjusted at the  
factory prior to shipping. However, each sail switch adjustment must  
be checked to assure that this important safety control is functioning.  
(Refer to page 37 for Sail Switch Adjustment.)  
5. GAS MODELS - be sure that ALL gas shut-off valves are in the open position.  
6. Be sure ALL side and base panels are on the dryer.  
7. Check ALL service doors to insure that they are closed and secure.  
8. Be sure the lint door is securely in place.  
9. Rotate the basket (tumbler/drum) by hand to be sure it moves freely.  
10. Check bolts, nuts, screws, terminals, and fittings for security.  
11. STEAM MODELS - check to insure air supply (80 PSI) is connected to the dryers.  
12. STEAM MODELS - check to insure ALL steam shut-off valves are open.  
13. STEAM MODELS - check steam damper operation.  
14. Check tumbler bearing set screws to insure they are ALL tight.  
35  
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J. PREOPERATIONAL TESTS  
ALL dryers are thoroughly tested and inspected before leaving the factory. However, a preoperational test  
should be performed before the dryer is publicly used. It is possible that adjustments have changed in transit or  
due to marginal location (installation) conditions.  
1. Turn on electric power to the dryer.  
a. Open ALL shut-off valves - Gas Models ONLY  
2. Refer to the Operating Instructions for starting your particular model dryer.  
Gas Dryers  
When a gas dryer is first started (during initial start-up), it has a tendency not to ignite on the first ignition  
attempt. This is because the gas supply piping is filled with air, so it may take a few minutes for the air to be  
purged from the lines.  
NOTE: During the purging period, check to be sure that ALL gas shut-off valves are open.  
NOTE: Gas Dryers are equipped with a Hot Surface Ignition (HSI) system which has internal  
diagnostics. If ignition is not established within three times, the heat circuit in the HSI module  
will lock out until it is manually reset. To reset the HSI system, open and close the main door  
and restart the dryer.  
A gas pressure test should be taken at the gas valve pressure tap of each dryer to assure that the water  
column pressure (W.C.) is correct and consistent.  
NOTE: Water column pressure requirements (measured at the pressure tap of the gas valve body):  
Natural Gas .......... 3.5 - 4.0 -Inches Water Column (W.C.)  
L.P. Gas ................ 10.5-11.0 Inches Water Column (W.C.)  
IMPORTANT: There is no regulator provided in an L.P. dryer. The water column pressure must be  
regulated at the source (L.P. tank), or an external regulator must be added to each  
dryer.  
Steam Dryers  
Check to insure that steam damper is functioning properly.  
The steam damper should not "slam" (open or closed) when it reaches the end of (piston) travel. Additionally,  
the steam damper should not bind and/or stop during travel. If either of these conditions occur, the flow  
control must be adjusted. Refer to the bottom illustration on page 34 for air adjustment instructions.  
36  
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Electrically Heated Dryers  
Check to insure that electric oven/contactor assembly is activating.  
3. Make a complete operational check of ALL safety related circuits:  
a. Door Switch(es)  
b. Hi-Limit thermostats  
c. Sail switch - Gas and Electric Models ONLY  
NOTE: To check for proper sail switch operation (for Gas Models and Electric Models Only),  
open the main door and while holding main door switch plunger in, start dryer. The dryer  
should start but the heat circuit should not be activated (on). If the heat system is activated,  
the sail switch is improperly adjusted and must be adjusted by bending the actuator arm of the  
sail switch toward the burner box. If the actuator arm is bent too far toward the burner box of  
the dryer, the dryer may not have heat when needed. After any adjustment to the sail switch, the  
above procedure must be repeated to verify proper operation of the sail switch.  
4. The dryer should be operated through one (1) complete cycle to assure that no further adjustments are  
necessary and that ALL components are functioning properly.  
IMPORTANT: The dryer basket (tumbler) is treated with a protective coating. ADC suggests  
tumbling old clothes or material in the basket (tumbler), using a mild detergent to  
remove the protective coating.  
5. Make a complete operational check of ALL operating controls.  
a. For microprocessor model check controller (computer) programs/selections...  
1) Each microprocessor controller (computer) has been pre-programmed by the factory with the most  
commonly used parameter (program) selections. If computer program changes are required, refer to  
the computer programming manual which was shipped with the dryer.  
6. Check the electric service phase sequence (3-phase [3ø] models only). While the dryer is operating, check  
to see if the blower wheel (impeller/fan) is rotating in the proper direction. Looking from the front, the blower  
wheel (impellor/fan) should spin in the clockwise (CW) direction. If it is, the phasing is correct. If the phasing  
is incorrect, reverse two (2) of the three (3) leads at connections L1, L2, L3 of the power supply to the dryer.  
IMPORTANT: If the blower wheel (impellor/fan) is rotating in the wrong direction, this will not only  
drastically reduce drying efficiency, but it can also cause premature component  
failure.  
37  
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7. Reversing Models ONLY  
Basket (tumbler) dryer should never be operated with less than a 30 lb. load (dry weight). The size of the  
load will affect the coast-down and dwell (stop) times. The basket (tumbler) must come to a complete stop  
before starting in opposite direction.  
a. Microprocessor Models  
1) Spin and stop are not adjustable in the Automatic Mode and have been pre-programmed into the  
microprocessor controller (computer) for 150-seconds spin time in the forward direction, 120-seconds  
in the reverse direction, and a 5-second dwell (stop) time.  
2) Spin times and stop times are adjustable in the Manual (timed) Mode.  
b. Dual Timer Models  
1) Both dwell (stop) and basket (tumbler) spin time are adjustable. Refer to the illustration on page 49.  
8. Check to insure that ALL set screws (i.e., tumbler drive, idler, etc.) are tight.  
K. PREOPERATIONAL INSTRUCTIONS  
1. To start the dryer:  
a. Microprocessor (computer) dryers  
1) The L.E.D. (light emitting diode) display will read "FILL".  
2) Press the "E" on the touchpad of the keyboard.  
3) The dryer will start and the display will quickly show "Ld30", "F180", the dryer will start, and the  
L.E.D. (light emitting diode) display will show "dr30".  
4) To stop the dryer, open the main door and press "CLEAR/STOP" key.  
Refer to the User's Manual for detailed operating instructions.  
b. Dual Timer Dryers  
1) Turn drying timer knob for a time of 20 minutes.  
2) Select "High Temp".  
3) Push "Push To Start" Switch.  
38  
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L. SHUT DOWN INSTRUCTIONS  
If the dryer is to be shut down (taken out of service) for a period of time, the following must be performed:  
1. Discontinue power to the dryer either at the external disconnect switch or the circuit breaker.  
2. Discontinue the heat supply:  
a. GAS MODELS ... discontinue the gas supply.  
1) SHUT OFF external gas supply shut-off valve.  
2) SHUT OFF internal gas supply shut-off valve located in the gas valve burner area.  
b. STEAM MODELS ... discontinue the steam supply.  
1) SHUT OFF external (location furnished) shut-off valve.  
2) SHUT OFF internal steam valves in the supply lines and the return lines.  
39  
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SECTION IV  
SERVICE/PARTS INFORMATION  
A. SERVICE  
1. Service must be performed by a qualified trained technician, service agency, or gas supplier. If service is  
required, contact the distributor from whom the ADC equipment was purchased. If the distributor cannot be  
contacted or is unknown, contact the ADC Service Department for a distributor in your area.  
NOTE: When contacting the ADC Service Department, be sure to give them the correct model  
number and serial number so that your inquiry is handled in an expeditious manner.  
B. PARTS  
1. Replacement parts should be purchased from the distributor from whom the ADC equipment was  
purchased. If the distributor cannot be contacted or is unknown, contact the ADC Parts Department for a  
distributor in your area. Parts may also be purchased directly from the factory by calling the ADC Parts  
Department at (508) 678-9000 or you may FAX in your order at (508) 678-9447.  
NOTE: When ordering replacement parts from the ADC dealer or the ADC factory be sure to give  
them the correct model number and serial number so that your parts order can be  
processed in an expeditious manner.  
40  
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SECTION V  
WARRANTY INFORMATION  
A. RETURNING WARRANTY CARD(S)  
1. Before any dryer leaves the ADC factory test area, a warranty card (ADC Part No. 112254) is placed on  
the back side of the main door glass. These warranty cards are intended to serve the customer where we  
record the individual installation date and warranty information to better serve you, if you file a warranty  
claim.  
a. If a warranty card (ADC Part No. 112254) did come with your dryer, contact the ADC Warranty  
Department or ADC Service Department at (508) 678-9000.  
B. PARTS  
For a copy of the ADC commercial warranty covering your particular dryer(s), contact the ADC distributor from  
whom you purchased the equipment and request dryer warranty form ADC Part No. 450199. If the distributor  
cannot be contacted or is unknown, warranty information can be obtained from the factory by contacting the  
ADC Warranty Department at (508) 678-9000.  
NOTE: Whenever contacting the ADC factory for warranty or warranty information, be sure to have  
the dryer's model number and serial number available so that your inquiry can be handled in  
an expeditious manner.  
C. RETURNING WARRANTY PARTS  
ALL dryer or parts warranty claims or inquiries should be addressed to the ADC Warranty Parts Department.  
To expedite processing, the following procedures must be followed:  
1. No parts are to be returned to ADC without prior written authorization ("Return Material Authorization")  
from the factory.  
NOTE: An R.M.A. ("Return Material Authorization") is valid for only sixty (60) days from date of  
issue.  
a. The R.M.A. issued by the factory, as well as any other correspondence pertaining to the returned part(s),  
must be included inside the package with the failed merchandise.  
41  
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2. Each part must be tagged with the following information:  
a. Model number and serial number of the dryer from which part was removed.  
b. Nature of failure (be specific).  
c. Date of dryer installation.  
d. Date of part failure.  
e. Specify whether the part(s) being returned is for a replacement, a credit, or a refund.  
NOTE: If a part is marked for a credit or a refund, the invoice number covering the purchase of the  
replacement part must be provided.  
NOTE: Warranty tags (ADC Part No. 450064) are available at "no charge" from ADC upon request.  
3. The company returning the part(s) must clearly note the complete company name and address on the outside  
of the package.  
4. ALL returns must be properly packaged to insure that they are not damaged in transit. Damage claims are  
the responsibility of the shipper.  
IMPORTANT: No replacements, credits or refunds will be issued for merchandise damaged in transit.  
5. ALL returns should be shipped to the ADC factory in such a manner that they are insured and a proof of  
delivery can be obtained by the sender.  
6. Shipping charges are not the responsibility of ADC. ALL returns should be "prepaid" to the  
factory. Any "C.O.D." or "COLLECT" returns will not be accepted.  
IMPORTANT: No replacements, credits, or refunds will be issued if the claim cannot be processed  
due to insufficient information. The party filing the claim will be notified in writing,  
either by "FAX" or "CERTIFIED MAIL- Return Receipt Requested," as to the  
information necessary to process claim. If a reply is not received by the ADC  
Warranty Department within thirty (30) days from the FAX/letter date, then no  
replacement, credit, or refund will be issued, and the merchandise will be discarded.  
42  
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SECTION VI  
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 air flow. 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 HIGHLYCOMBUSTIBLE. THE  
ACCUMULATION OFLINT CAN CREATEAPOTENTIALFIRE HAZARD.  
WARNING: KEEPDRYERAREACLEARAND FREE FROM COMBUSTIBLE  
MATERIALS, GASOLINE, and OTHER FLAMMABLE VAPORS and  
LIQUIDS.  
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 every third or fourth load. A clogged lint screen will cause poor dryer performance.  
The lint screen is located behind the lint door in the base of the dryer. Open the lint door, brush the lint off the  
lint screen, and remove the lint. Inspect lint screen and replace if torn.  
NOTE: The frequency of cleaning the lint screen can best be determined from experience at each  
location.  
WEEKLY  
Clean lint accumulation from lint chamber, thermostat, and microprocessor temperature sensor (sensor  
bracket) area.  
WARNING: TOAVOID THE HAZARD OFELECTRICALSHOCK, DISCONTINUE  
ELECTRICALSUPPLYTO THE DRYER.  
43  
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STEAM MODELS  
Clean the steam coil fins. We suggest using compressed air and a vacuum cleaner with brush attachment.  
WARNING: When cleaningsteam coilfins,becarefulnottobend thefins. Iffinsarebent,straighten  
byusingafincombwhichisavailablefrom localairconditioningsupplyhouse.  
90 DAYS  
1. Remove lint from around basket (tumbler), drive motors, and surrounding areas.  
2. Remove lint from gas valve burner area with a dusting brush or vacuum cleaner attachment.  
3. Clean any lint accumulation in and around both the blower and drive motor casing openings.  
NOTE: Topreventdamage,avoidcleaningand/ ortouchingignitor/ flame-probeassembly.  
EVERY 6 MONTHS  
Inspect and remove lint accumulation in customer furnished exhaust duct work system and from dryers  
internal exhaust ducting.  
NOTE: THE ACCUMULATION OF LINT IN THE EXHAUST DUCT WORK CAN  
CREATE A POTENTIALFIRE 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 REMOVEANYLINTACCUMULATION WHICH  
CAN CAUSE THE DAMPER TO BIND or STICK.  
NOTE: Abackdraftdamperthatisstickingpartiallyclosed canresultinslow dryingand shutdownof  
theheatcircuitsafetyswitchesorthermostats.  
NOTE: Whencleaningthedryercabinet(s),avoid usingharshabrasives. Aproductintended forthe  
cleaningofappliancesisrecommended.  
44  
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B. ADJUSTMENTS  
7 DAYS AFTER INSTALLATION and EVERY 6 MONTHS THEREAFTER  
Inspect bolts, nuts, screws, (bearing set screws), non-permanent 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 switches, lint drawer  
switch, sail switch, burner and hi-limit thermostats).  
45  
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SECTION VII  
PROCEDURE FOR FUNCTIONAL CHECK OF  
REPLACEMENT COMPONENTS  
1. Microprocessor (computer) Board  
a. Upon completing installation of the replacement microprocessor (computer) board, reestablish power to  
the dryer.  
b. Start the drying cycle by pressing any of the preset cycle in letters "A thru F".  
c. Verify that the motor(s) and heat indicator dots in the microprocessor (computer) L.E.D. (light emitting  
diode) are on. (Refer to the illustration below.)  
46  
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d. Verify that the motor(s) heat, and door indicator lights on the back side of the microprocessor (computer)  
board are lit. (Refer to the illustration below.)  
e. Open the main door.  
The dryer must stop and ALL output indicator lights on the back side of the microprocessor (computer)  
board must go out. (Refer to illustration above.)  
f. Try to restart the dryer with the main door open.  
g. The microprocessor (computer) board's L.E.D. (light emitting diode) display must read "DOOR."  
h. Close the main door and restart the dryer.  
i. Functional check of microprocessor (computer) board is complete.  
47  
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2. Hot Surface Ignition (HSI) System (for Gas Models Only)  
a. Upon completing installation of the replacement  
Hot Surface Ignition (HSI) module, reestablish  
power to the dryer.  
b. The Hot Surface Ignition (HSI) module's "red"  
indicator light will light up for approximately 5-  
seconds (self check routine).  
If the Hot Surface Ignition (HSI) module's "red"  
indicator light stays on or flashes continuously,  
then the HSI module is wired incorrectly or has  
failed.  
c. Start the drying cycle.  
d. The hot surface ignitor will turn on. After approximately 4 seconds the Glo Bar will shut off and the gas  
valve will be energized. The flame should now be established.  
e. With the burner flame on, remove the flame sensor wire from the S2 terminal of the HSI module. The  
burner flame must shut off immediately.  
f. Stop the drying cycle, with the flame sensor wire still removed, restart the drying cycle.  
g. The hot surface ignitor will turn on and after approximately 4-seconds the hot surface ignitor will shut off.  
The gas valve will be energized and a burner flame should be evident for approximately 7-seconds and  
then shut off.  
h. The Hot Surface Ignition (HSI) module will attempt two (2) additional ignition trials after which the HSI  
module will lock out and the "red" indicator light will flash continuously.  
i. Functional check of the Hot Surface Ignition (HSI) Module is complete.  
1) Replace the flame sensor wire from the S2 terminal to the HSI module.  
48  
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SECTION VIII  
REVERSING TIMER SPIN/DWELL  
ADJUSTMENTS  
Dual timer models with "reversing option" have an electric reversing timer in the electric service box which is  
located in the upper rear area of the dryer.  
Both the dwell (stop) time and basket (tumbler) spin time are adjustable by mode selection switches located on  
the electronic timer (as noted in the illustration below).  
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49  
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SECTION IX  
TECHNICAL INFORMATION  
A. DATA LABEL  
Contact American Dryer Corporation  
When contacting American Dryer Corporation certain information is required to insure proper service/parts  
information from ADC. This information is on the data label located on the inside of the control door. When  
contacting American Dryer Corporation please have the model number and serial number available.  
50  
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THE DATA LABEL  
1. MODEL DRYER  
The model number is an ADC number which describes the size of the dryer and the  
type of heat (gas, electric, or steam).  
2. SERIAL NUMBER  
The serial number allows ADC to gather information on your particular dryer.  
3. MANUFACTURING CODE NUMBER  
The manufacturing code number is a number issued by ADC which describes  
ALL possible options on your particular model.  
4. TYPE OF HEAT  
The type of heat describes the type heat for your particular dryer; gas (either natural  
gas or liquid propane [L.P.]), or steam.  
5. HEAT INPUT (for GAS DRYERS)  
This describes the heat input in British Thermal Units per Hour (BTUH).  
6. ORIFICE SIZE (for GAS DRYERS)  
Gives the number drill size used.  
7. ELECTRIC SERVICE  
This describes the electric service for your particular model.  
8. GAS MANIFOLD PRESSURE (for GAS DRYERS)  
This describes the manifold pressure taken at the gas valve tap.  
9. APPLICABLE APPROVAL SEAL(S)  
i.e., American Gas Association, Canadian Gas Association.  
51  
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SECTION X  
TROUBLESHOOTING  
WARNING: YOU MUST DISCONNECT and LOCKOUTTHE ELECTRIC SUPPLYand  
THE GAS SUPPLYorTHE STEAM SUPPLYBEFOREANYCOVERS or  
GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS  
FOR CLEANING, ADJUSTING, INSTALLATION, or TESTING OFANY  
EQUIPMENT per OSHA (Occupational Safety and Health Administration)  
STANDARDS.  
The information provided will help isolate the most probable component(s) associated with the difficulty  
described. The experienced technician realizes, however, that a loose connection or broken/shorted wire may be  
at fault where electrical components are concerned ... not necessarily the suspect component itself. Electrical  
parts should always be checked for failure before being returned to the factory.  
IMPORTANT: When replacing blown fuses, the replacement must be of the exact rating as the fuse  
being replaced. The information provided should not be misconstrued as a hand-  
book for use by an untrained person in making repairs.  
WARNING: ALL SERVICE and TROUBLESHOOTING SHOULD BE PERFORMED BYA  
QUALIFIED PROFESSIONALor SERVICEAGENCY.  
WARNING: WHILE MAKING REPAIRS, OBSERVE ALL SAFETYPRECAUTIONS  
DISPLAYED ON THE DRYER or SPECIFIED IN THIS MANUAL.  
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53  
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MICROPROCESSOR (COMPUTER) MODELS  
A. No L.E.D. (light emitting diode) display (for microprocessor [computer] models ONLY)...  
1. Service panel fuse blown or tripped breaker.  
2. Blown control circuit L1 or L2 1/2-amp (Slo Blo) fuse.  
3. Failed microprocessor controller (computer).  
4. Failed control step down transformer (for 380 volts or higher models ONLY).  
B. Drive motor is not operating (does not start)...  
1. Microprocessor controller (computer) motor indicator dot and relay output L.E.D. (light emitting diode)  
indicator dots are on ...  
a. Failed drive motor contactor (relay).  
b. Failed arc suppressor (A.S.) board (for Reversing Models ONLY).  
c. Failed drive motor.  
2. Microprocessor controller (computer) motor indicator dot and relay output L.E.D. (light emitting diode)  
indicator dots are on, but motor output L.E.D. indicator is off ...  
a. Failed microprocessor controller (computer).  
C. Drive motor (Reversing Models ONLY) operates in one direction only...stops and restarts in the  
same direction...  
1. Failed reversing contactor (relay).  
2. Failed arc suppressor (A.S.) board.  
3. Failed microprocessor controller (computer)...check output indicator.  
D. Drive motor operates okay for a few minutes, then stops and will not restart...  
1. Motor is overheating and tripping out on internal overload protector ...  
a. Motor air vents clogged with lint.  
b. Low voltage to motor.  
c. Failed motor.  
d. Tumbler (basket) is binding...check for an obstruction.  
e. Failed idler bearings or tumbler bearings.  
f. Failed blower (impellor/fan)...out of balance (for Non-Reversing Models ONLY).  
54  
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E. Blower/Fan motor is not operating (does not start)...  
1. Microprocesssor controller (computer) motor indicator dot and relay output L.E.D. (light emitting diode)  
indicator dots are on ...  
a. Failed blower (impellor/fan) motor contactor (relay).  
b. Failed arc suppressor (A.S.) board.  
c. Failed blower (fan/impellor) motor.  
2. Microprocessor controller (computer) "door" L.E.D. is on but motor output L.E.D. indicator is off...  
a. Failed microprocessor controller (computer).  
F. Blower/Fan motor (Reversing Models ONLY) operates okay for a few minutes, then stops and will  
not restart...  
1. Motor is overheating and tripping out on internal overload protector ...  
a. Motor air vents clogged with lint.  
b. Low voltage to motor.  
c. Failed motor.  
d. Failed blower (impellor/fan)...out of balance.  
G. Both drive motor and blower (impellor/fan) motor (Reversing Models ONLY) not operating (does  
not start)...microprocessor (computer) motor indicator dots and relay output L.E.D. (light  
emitting diode) indicators are on...  
1. Failed arc suppressor (A.S.) board.  
2. Failed contactors (both blower [fan/impellor] and drive).  
3. Failed motors (both blower [fan/impellor] motor and drive motor).  
H. Both drive motor and blower (impellor/fan) motor (Reversing Models ONLY) not operating (does  
not start)...microprocessor (computer) L.E.D. (light emitting diode) motor indicator dots and the  
“door” L.E.D. indicator are on but the relay output L.E.D. indicators are off (microprocessor  
controller [computer] L.E.D. display does not read “door”)...  
1. Failed microprocessor controller (computer).  
I. Both drive motor and blower (impellor/fan) motor run a few minutes and stop...microprocessor  
(computer) L.E.D. (light emitting diode) display continue to read time or percent of extraction and  
ALL indicator dots are off...  
1. Fault in main door switch circuit ...  
a. Main door switch circuit out of adjustment.  
55  
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b. Loose connection in main door switch circuit.  
J. Microprocessor (computer) L.E.D. (light emitting diode) display reads "dSFL" continuously and  
the buzzer (tone) sounds every 30 seconds...  
1. Fault in microprocessor heat sensing circuit.  
a. Blown "dSFL" 1/8-amp fuse on the microprocessor controller (computer).  
b. Failed microprocessor temperature sensor.  
c. Failed microprocessor controller (computer).  
d. Broken wire or connection somewhere between the microprocessor controller (computer) and the  
microprocessor temperature sensor.  
K. Microprocessor controller (computer) L.E.D. (light emitting diode) display reads “door” and the  
microprocessor (computer) “DOOR” L.E.D. indicator is off...  
1. Fault (open circuit) in main door/lint drawer switch circuit ...  
a. Main door not closed all the way.  
b. Main door switch is out of proper adjustment.  
c. Failed lint main door switch.  
d. Broken wire/connection in main door wiring circuit.  
2. Failed 24 VAC step down transformer.  
L. Microprocessor controller (computer) L.E.D. ([light emitting diode] display reads “door” and the  
microprocessor (computer) “DOOR” L.E.D. indicator is on...  
1. Failed microprocessor controller (computer).  
M. Microprocessor controller (computer) will not accept any keyboard [touchpad] entries, (i.e., L.E.D.  
[light emitting diode] display reads “FILL” and when keyboard [touchpad] entries are selected,  
the L.E.D. display continues to read “FILL”)...  
1. Failed keyboard label (touchpad) assembly.  
2. Failed microprocessor controller (computer).  
N. Microprocessor controller (computer) will only accept certain keyboard (touchpad) entries...  
1. Failed keyboard (touchpad) label assembly.  
56  
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O. Microprocessor controller (computer) locks up and L.E.D. (light emitting diode) display reads  
erroneous message(s) or only partial segments...  
1. Transient power voltage spikes...disconnect the electrical power to the dryer, wait one (1) minute and  
reestablish power to the dryer. If problem is still evident ...  
a. Failed microprocessor controller (computer).  
b. Failed keyboard label (touchpad) assembly.  
P. Dryer stops during a cycle, microprocessor controller (computer) buzzer (tone) sounds for  
5-seconds, and then the L.E.D. display reads “dSFL” for approximately 30-seconds, and then  
returns to “FILL”...  
1. Loose connection somewhere between the microprocessor controller (computer) and the microprocessor  
temperature sensor.  
2. Loose "dSFL" 1/8-amp fuse on the microprocessor controller (computer).  
Q. Dryer stops during a cycle, microprocessor controller (computer) buzzer (tone) sounds for  
5-seconds, and then the L.E.D. (light emitting diode) returns to “FILL”...  
1. Loose connection somewhere in the main power circuit to the microprocessor controller (computer).  
R. Microprocessor controller (computer) L.E.D. (light emitting diode) display reads “SEFL”...  
1. Rotational sensor circuit failure...fault somewhere in the tumbler (basket) rotation or circuit ...  
a. Tumbler (basket) not rotating ...  
1) Broken or loose V-belts.  
2) Failure in drive motor circuit...refer to Section B, Section C, and Section D on page 54.  
b. Failed rotational sensor.  
c. Broken wire or connection between rotation sensor and microprocessor controller (computer).  
d. Microprocessor controller (computer) is programmed incorrectly for Rotation Sensor Option and dryer  
is not equipped with this option.  
S. Microprocessor controller (computer) L.E.D. (light emitting diode) display reads “Hot”...  
1. Possible overheating condition...microprocessor controller (computer) has sensed a temperature which  
has exceeded 220° F.  
“Hot” display will not clear until temperature sensed has dropped to 220° F or lower and the micro-  
processor controller (computer) is manually reset by pressing the “CLEAR/STOP” key.  
57  
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T. Heating unit is not operating (no heat)...no voltage at heating unit (i.e., Gas Model - HSI module,  
Electric Model - electric oven contactor, or Steam Model - steam damper system pneumatic  
solenoid) when dryer is first started and both the heat indicator dot and the "HEAT" output  
L.E.D. (light emitting diode) is on...  
GAS MODELS ...  
1. Fault in sail switch circuit ...  
a. Sail switch is out of adjustment or has failed.  
b. Sail switch damper is not closing or is fluttering.  
1) Lint screen is dirty.  
2) Restriction in the exhaust.  
3) No exhaust air flow ...  
a) Failed impellor (fan/blower).  
b) Fault in blower (impellor/fan) motor circuit (for Reversing Models ONLY).  
2. Failed burner hi-limit.  
3. Failed lint chamber sensor bracket basket (tumbler) hi-limit switch.  
ELECTRIC MODELS ...  
1. Fault in sail switch circuit ...  
a. Sail switch is out of adjustment or has failed.  
b. Sail switch damper is not closing or is fluttering.  
1) Lint screen is dirty.  
2) Restriction in the exhaust.  
3) No exhaust air flow ...  
a) Failed impellor (fan/blower).  
b) Fault in blower (impellor/fan) motor circuit (for Reversing Models ONLY).  
2. Failed burner hi-limit.  
3. Failed lint chamber sensor bracket basket (tumbler) hi-limit switch.  
58  
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STEAM MODELS ...  
1. Fault in lint chamber sensor bracket basket (tumbler) hi-limit.  
U. Heating unit is not operating (no heat)...no voltage at heating unit (i.e., Gas Model - HSI module,  
Electric Model - electric oven contactor, or Steam Model - steam damper system pneumatic  
solenoid) when dryer is first started and both the heat indicator dot and the "HEAT" output  
L.E.D. (light emitting diode) is not on...  
1. Failed microprocessor controller (computer).  
V. Heating unit is not operating (no heat)...no voltage at heating unit (i.e., Gas Model - HSI module,  
Electric Model - electric oven contactor, or Steam Model - steam damper system 3-way micro  
valve)...  
GAS MODELS ...  
1. Fault in Hot Surface Ignition (HSI) system ...  
a. Ignitor glows, but no ignition and HSI module "LOCKS-OUT" ("red" L.E.D. [light emitting diode]  
indicator flashes) ...  
1) Flame probe assembly is out of adjustment or has failed.  
2) Severe air turbulence.  
3) Failed HSI module.  
4) Failed gas valve.  
b. Ignitor glows, burner lights but burner goes off right away ...  
1) Flame probe assembly is out of adjustment or has failed.  
2) Sail switch is fluttering ...  
a) Lint screen is dirty.  
b) Restriction in exhaust duct work.  
c. Hot Surface Ignitor does not glow and HSI module "LOCKS-OUT" ("red" L.E.D. [light emitting  
diode] indicator flashes) ...  
1) Fault in Ignitor wiring...break or loose connection.  
2) Failed IgnitorAssembly.  
3) Failed HSI module.  
59  
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ELECTRIC MODELS ...  
1. Failed oven contactor/coil.  
2. Failed electric heating element(s).  
STEAM MODELS ...  
1. Air Operated System...  
a. No (external) compressed air (80 PSI required) to steam damper solenoid.  
b. Failed steam damper pneumatic solenoid.  
c. Steam damper stuck in closed position...check for obstruction.  
d. Leak in pneumatic system.  
e. Failed steam damper air piston.  
f. Flow control valve misadjusted.  
2. Electrical Mechanical System...  
a. Failed electrical mechanical motor.  
b. Steam damper stuck in closed position...check for obstruction.  
W. Dryer operates but is taking too long to dry...  
1. Exhaust duct work run is too long or is undersized...back pressure cannot exceed 0.3 inches water  
column (W.C.).  
2. Restriction in duct work ...  
a. Dryer back draft damper is sticking partially closed.  
b. Restriction/obstruction in duct work ...  
1) Check duct work from the dryer all the way to the outdoors.  
3. Insufficient make-up air.  
4. Impellor (fan/blower) is rotating in the wrong direction only (for 3ø Models ONLY).  
5. Lint screen is dirty or is not being cleaned often enough.  
6. Inadequate air flow ...  
a. Impellor (fan/blower) failure.  
60  
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GAS MODELS ...  
1) Low and/or inconsistent gas pressure.  
Natural Gas pressure - must be between 3.5 and 4.0 inches of water column (W.C.).  
L.P. (liquid propane) Gas pressure - must be between 10.5 and 11.0 inches of water column (W.C.).  
2) Poor air/gas mixture at burner (too much gas or not enough air) at the burner...yellow or poor flame  
pattern ...  
a. Not enough make-up air.  
b. Restriction in the exhaust.  
2) Poor air/gas mixture at burner (too much gas or not enough air) at the burner...yellow or poor flame  
pattern ...  
c. Gas pressure too high.  
d. Impellor (fan/blower) is rotating in the wrong direction only (for 3ø Models ONLY).  
e. Burner orifice size (D.M.S. [drill material size]) too large for application (i.e., high elevation).  
3) Sail switch is fluttering ...  
a) Restriction in the exhaust ...  
1) Lint screen is dirty or is not being cleaned often enough.  
4) Failed burner hi-limit...opens at incorrect temperature.  
5) Gas supply may have too low a heating value.  
ELECTRIC MODELS ...  
1) No enough make-up air.  
2) Restriction in the exhaust ...  
3) Lint screen is dirty or is not being cleaned often enough.  
4) Impellor (fan/blower) is rotating in the wrong direction only (for 3ø Models ONLY).  
5) Failed electric element(s).  
6) Sail switch is fluttering ...  
a) Restriction in the exhaust.  
b) Sail switch is not adjusted properly.  
61  
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STEAM MODELS ...  
1) Low steam supply.  
a) Steam trap is too small.  
b) Supply line is too small.  
2) Low steam pressure.  
3) Insufficient make-up air.  
4) Lint screen is dirty or is not being cleaned often enough.  
5) Restriction in the exhaust.  
6) Dirty steam coil ...  
a) Fins are clogged with lint.  
7) Steam damper system is not functioning properly.  
a) Steam damper is sticking closed.  
b) Leak in the pneumatic (air) system.  
7. Extractors (water) are not functioning properly.  
8. Failed microprocessor controller (computer)...temperature calibration is inaccurate.  
9. Failed microprocessor temperature sensor... calibration is inaccurate.  
10. Failed lint chamber hi-heat switch (thermostat)...opens at incorrect temperature.  
11. Microprocessor temperature sensor covered with lint.  
NOTE: Lint accumulation on the sensor bracket can act as an insulator which will affect the accuracy  
of the Automatic Drying Cycle.  
X. At the completion of the "AUTO" drying/cooling cycle, the load is coming out over dried...  
1. Percent of dryness (dryness level) of the cycle selected is too high.  
2. Factor "A" and Factor "B" is not set correctly or Factor "B" has to be adjusted for adverse local conditions.  
Y. At the completion of the "AUTO" drying/cooling cycle, the load is coming out still damp...  
1. Percent of dryness (dryness level) of the cycle selected is too low.  
2. Factor "A" and Factor "B" is not set correctly or Factor "B" has to be adjusted for adverse local conditions.  
62  
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Z. Main burners are burning with a yellow flame (for Gas Models ONLY)...  
1. Poor air/gas mixture (too much gas or not enough air) at the burner ...  
a. Not enough make-up air.  
b. Restriction in the exhaust.  
c. Gas pressure is too high.  
d. Impellor (fan/blower) is rotating in the wrong direction only (for 3ø Models ONLY).  
e. Burner orifice size (D.M.S. [drill material size]) too large for application (i.e., high elevation).  
AA. Condensation on main door glass...  
1. Too long, undersized, or improperly installed duct work.  
2. Back draft damper is sticking in the partially closed position.  
BB. Scraping noise at basket (tumbler) area...  
1. Check for obstruction caught in basket (tumbler)/wrapper area.  
2. Basket (tumbler) is out of proper alignment ...  
a. Check both the vertical alignment and lateral alignment.  
b. Check for gap between the front panel and basket (tumbler)...bearing set screws may have come  
loose, and basket (tumbler) walked forward or backward.  
3. Loose basket (tumbler) tie rod.  
4. Failed basket (tumbler) support.  
CC. Excessive noise and/or vibration...  
1. Dryer is not leveled properly.  
2. Impellor (fan/blower) out of balance ...  
a. Excessive lint build up on impellor (fan/blower).  
b. Failed impellor (fan/blower).  
3. Loose basket (tumbler) tie rod.  
4. Failed basket (tumbler) support.  
5. Loose motor mount.  
6. Failed idler bearings or basket (tumbler) bearings.  
63  
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7. V-belts too tight or too loose.  
8. Tumbler bearing set screws are loose.  
9. Failed motor bearing.  
TIMER MODELS  
A. Dryer will not start...both drive motor and blower (impellor/fan) motor are not operating and  
indicator light is off...  
1. Service panel fuse blown or tripped breaker.  
2. Dryer control circuit L1 or L2 1/2-amp (Slo Blo) fuse is blown.  
3. Open in main door switch ...  
a. Main door is not closed all the way.  
b. Main door switch is out of proper adjustment.  
c. Failed main door switch.  
d. Broken connection/wire somewhere in the main door switch circuit.  
4. Failed push-to-start relay.  
5. Failed 24 VAC step down transformer or a fault in the wiring.  
6. Failed heat timer.  
7. Failed control step down transformer (for 380 volts or higher models ONLY).  
B. Drive motor is not operating (does not start)...  
1. Failed drive motor contactor (relay).  
2. Failed reversing timer (for Reversing Models ONLY).  
3. Failed drive motor.  
C. Drive motor (Reversing Models ONLY) operates in one direction only...stops and restarts in the  
same direction...  
1. Failed reversing contactor (relay).  
2. Failed reversing timer.  
64  
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D. Drive motor operates okay for a few minutes, then stops and will not restart...  
1. Motor is overheating and tripping out on internal overload protector ...  
a. Motor air vents clogged with lint.  
b. Low voltage to motor.  
c. Failed motor.  
d. Tumbler (basket) is binding...check for an obstruction.  
e. Failed idler bearings or tumbler bearings.  
E. Blower/Fan motor is not operating (does not start)...  
1. Failed blower (impellor/fan) motor contactor (relay).  
2. Failed blower (fan/impellor) motor.  
F. Blower/Fan motor operates okay for a few minutes, then stops and will not restart...  
1. Motor is overheating and tripping out on internal overload protector ...  
a. Motor air vents clogged with lint.  
b. Low voltage to motor.  
c. Failed motor.  
d. Failed blower (impellor/fan)...out of balance.  
G. Both drive motor and blower (impellor/fan) motor (Reversing Models ONLY) not operating (do not  
start) and indicator light is on...  
1. Fault at L1 or L2 termination(s) between the terminal block and contactors (relays).  
2. Failed contactors (both blower [fan/impellor] and drive ).  
3. Failed motors (both blower [fan/impellor] motor and drive motor).  
H. Heating unit is not operating (no heat)...no voltage at heating unit (i.e., Gas Model - HSI module,  
Electric Model - electric oven contactor, or Steam Model - steam damper system pneumatic  
solenoid) when dryer is first started...  
GAS MODELS ...  
1. Fault in sail switch circuit ...  
a. Sail switch is out of adjustment or has failed.  
65  
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b. Sail switch damper is not closing or is fluttering.  
1) Lint screen is dirty.  
2) Restriction in the exhaust.  
3) No exhaust air flow ...  
a) Failed impellor (fan/blower).  
b) Fault in blower (impellor/fan) motor circuit (for Reversing Models ONLY).  
2. Failed burner hi-limit.  
3. Failed lint chamber sensor bracket basket (tumbler) hi-limit switch.  
ELECTRIC MODELS ...  
1. Fault in sail switch circuit ...  
a. Sail switch is out of adjustment or has failed.  
b. Sail switch damper is not closing or is fluttering.  
1) Lint screen is dirty.  
2) Restriction in the exhaust.  
3) No exhaust air flow ...  
a) Failed impellor (fan/blower).  
b) Fault in blower (impellor/fan) motor circuit.  
c. Failed oven hi-limit.  
d. Failed lint chamber sensor bracket basket (tumbler) hi-limit.  
e. Failed temperature selection switch or circuit.  
f. Failed temperature cycle thermostat (try another selection).  
STEAM MODELS ...  
1. Failed lint chamber sensor bracket hi-limit switch or circuit.  
2. Failed temperature selection switch or circuit.  
3. Failed temperature cycle thermostat (try another selection).  
4. Failed heat timer.  
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I. No heat)...no voltage at heating unit (i.e., Gas Model - Hot Surface Ignition [HSI] module, Electric  
Model - electric oven contactor, or Steam Model - steam damper system pneumatic solenoid)...  
GAS MODELS ...  
1. Fault in hot surface ignition system ...  
a. Hot Surface Ignitor glows but no ignition and HSI module "LOCKS-OUT" ("red" L.E.D. [light emitting  
diode] indicator flashes) ...  
1) Flame probe assembly is out of adjustment or has failed.  
2) Severe air turbulence.  
3) Failed HSI module.  
4) Failed gas valve.  
b. Hot Surface Ignitor glows, but burner goes off right away ...  
1) Flame probe assembly is out of adjustment or has failed.  
2) Sail switch is fluttering ...  
a) Lint screen is dirty.  
b) Restriction in exhaust duct work.  
c. Hot Surface Ignitor does not glow and HSI module "LOCKS-OUT" ("red" L.E.D. [light emitting  
diode] indicator flashes)...  
1) Fault in Hot Surface Ignitor wiring...break or loose connection.  
2) Failed Hot Surface Ignitor.  
3) Failed HSI module.  
ELECTRIC MODELS ...  
1. Failed oven contactor/coil.  
2. Failed electric heating element(s).  
STEAM MODELS ...  
1. Air Operated System...  
a. No (external) compressed air (80 PSI required) to steam damper solenoid.  
b. Failed steam damper pneumatic solenoid.  
c. Steam damper stuck in closed position...check for obstruction.  
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d. Leak in pneumatic system.  
e. Failed steam damper air piston.  
f. Flow control valve misadjusted.  
2. Electrical Mechanical System...  
a. Failed electrical mechanical motor.  
b. Steam damper stuck in closed position...check for obstruction.  
J. Dryer operates but is taking too long to dry...  
1. Exhaust duct work run is too long or is undersized...back pressure cannot exceed 0.3 inches water  
column (W.C.).  
2. Restriction in duct work ...  
a. Dryer back draft damper is sticking partially closed.  
b. Restriction/obstruction in duct work ...  
1) Check duct work from the dryer all the way to the outdoors.  
3. Insufficient make-up air.  
4. Impellor (fan/blower) is rotating in the wrong direction only (for 3ø Models ONLY).  
5. Lint screen is dirty or is not being cleaned often enough.  
6. Inadequate air flow ...  
a. Impellor (fan/blower) failure.  
GAS MODELS ...  
1) Low and/or inconsistent gas pressure.  
Natural Gas pressure - must be between 3.5 and 4.0 inches of water column (W.C.).  
L.P. (liquid propane) Gas pressure - must be between 10.5 and 11.0 inches of water column (W.C.).  
2) Poor air/gas mixture at burner (too much gas or not enough air) at the burner...yellow or poor flame  
pattern ...  
a. Not enough make-up air.  
b. Restriction in the exhaust.  
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3) Sail switch is fluttering ...  
a) Lint screen is dirty or is not being cleaned often enough.  
b) Restriction in the exhaust.  
4) Failed burner hi-limit...opens at incorrect temperature.  
5) Gas supply may have too low a heating value.  
ELECTRIC MODELS ...  
1) Not enough make-up air.  
2) Restriction in the exhaust ...  
3) Lint screen is dirty or is not being cleaned often enough.  
4) Impellor (fan/blower) is rotating in the wrong direction only (for 3ø Models ONLY).  
5) Failed electric element(s).  
6) Sail switch is fluttering ...  
a) Restriction in the exhaust.  
b) Sail switch is not adjusted properly.  
STEAM MODELS ...  
1) Low steam pressure.  
2) Insufficient make-up air.  
3) Lint screen is dirty or is not being cleaned often enough.  
4) Restriction in the exhaust.  
5) Dirty steam coil ...  
a) Fins are clogged with lint.  
6) Steam damper system is not functioning properly.  
a) Steam damper is sticking closed.  
b) Leak in the pneumatic (air) system.  
7. Extractors (water) are not functioning properly.  
8. Failed lint chamber hi-heat switch (thermostat)...opens at incorrect temperature.  
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9. Exceptionally cold/humid or low barometric pressure atmosphere.  
10. Cycle temperature thermostats are covered with lint.  
NOTE: Lint accumulation on the sensor bracket can act as an insulator which will affect the accuracy  
of the Automatic Drying Cycle.  
K. Main burners are burning with a yellow flame (for Gas Models ONLY)...  
1. Poor air/gas mixture (too much gas or not enough air) at the burner ...  
a. Not enough make-up air.  
b. Restriction in the exhaust.  
c. Gas pressure is too high.  
d. Impellor (fan/blower) is rotating in the wrong direction only (for 3ø Models ONLY).  
e. Burner orifice size (D.M.S. [drill material size]) too large for application (i.e., high elevation).  
L. Condensation on main door glass...  
1. Too long, undersized, or improperly installed duct work.  
2. Back draft damper is sticking in the partially closed position.  
M. Scraping noise at basket (tumbler) area...  
1. Check for obstruction caught in basket (tumbler)/wrapper area.  
2. Basket (tumbler) is out of proper alignment ...  
a. Check both the vertical alignment and lateral alignment.  
b. Check for gap between the front panel and basket (tumbler)...bearing set screws may have come  
loose, and basket (tumbler) walked forward or backward.  
3. Loose basket (tumbler) tie rod.  
4. Failed basket (tumbler) support.  
N. Excessive noise and/or vibration...  
1. Dryer is not leveled properly.  
2. Impellor (fan/blower) out of balance ...  
a. Excessive lint build up on impellor (fan/blower).  
b. Failed impellor (fan/blower).  
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3. Loose basket (tumbler) tie rod.  
4. Basket (tumbler) out of adjustment, or adjustment bolts (hardware) are loose.  
5. Failed basket (tumbler) support.  
6. Loose motor mount.  
7. Failed idler, basket (tumbler), or blower drive bearings.  
8. V-belts too tight or too loose.  
9. Bearing set screws (either basket [tumbler], idler, or blower shaft) are loose.  
10. Failed motor bearing.  
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ADC  
1
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