W ARNING: 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
vapors and liquids in the vicinity of this or any
other appliance.
— WHA T TO 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.
AVERTISSEMENT: Assurez-vous de bien
suivre les instructions données dans cette notice
pour réduire au minimum le risque d’incendie
ou d’explosion ou pour éviter tout dommage
matériel, toute blessure ou la mort.
— Ne pas entreposer ni utiliser d’essence ni
d’autres vapeurs ou liquides inflammables à
proximité de cet appareil ou de tout autre
appareil.
— QUE F AIRE SI VOUS SENTEZ UNE ODEUR
DE GAZ:
•Ne pas tenter d’allumer d’appareils.
•Ne touchez à aucun interrupteur . Ne pas
vous servir des téléphones se trouvant dans
le bâtiment.
•Évacuez la pièce, le bâtiment ou la zone.
•Appelez immédiatement votre fournisseur
de gaz depuis un voisin. Suivez les
instructions du fournisseur.
•Si vous ne pouvez rejoindre le fournisseur
de gaz, appelez le service des incendies.
— L ’installation et l’entretien doivent être assurés par
un installateur ou un service d’entretien qualifié
ou par le fournisseur de gaz.
American Dryer Corporation
88 Currant Road
Fall River MA 02720-4781
T elephone: (508) 678-9000 / Fax: (508) 678-9447
E-mail: techsupport@amdry.com
www .amdry .com
ADC Part No. 113406
Retain This Manual In A Safe Place For Future Reference
American Dryer Corporation products embody advanced concepts in engineering, design, and safety. If this product is
properly maintained, it will provide many years of efficient, trouble free, and most importantly, safe operation.
ONLY qualified technicians should service this equipment.
OBSERVEALLSAFETYPRECAUTIONS displayed on the equipment or specified in the installation manual included with
the dryer.
The following “FOR YOUR SAFETY” caution must be posted near the dryer in a prominent location.
FOR YOUR SAFETY
Do not store or use gasoline or
other flammable vapors and
liquids in the vicinity of this or
any other appliance.
W e have tried to make this manual as complete as possible and hope you will find it useful. ADC reserves the right to make
changes from time to time, without notice or obligation, in prices, specifications, colors, and material, and to change or
discontinue models. The illustrations included in this manual may not depict your particular dryer exactly.
POUR VOTRE SÉCURITÉ
Ne pas entreposer ni utiliser d’essence
ni d’autres vapeurs ou liquides
inflammables à proximité de cet
appareil ou de tout autre appareil.
Important
For your convenience, log the following information:
DA TE OF PURCHASE________________________________ MODEL NO. __________________________________________
RESELLER’S NAME ________________________________________________________________________________________
Serial Number(s)________________________________________________________________________________________
Replacement parts can be obtained from your reseller or the ADC factory. When ordering replacement parts from the factory ,
you can F AX your order to ADC at (508) 678-9447 or telephone your order directly to the ADC Parts Department at (508)
678-9000. Please specify the dryer model number and serial number in addition to the description and part number, so that
your order is processed accurately and promptly.
“IMPORT ANT NOTE TO PURCHASER”
Information must be obtained from your local gas supplier on the instructions
to be followed if the user smells gas. These instructions must be posted in a
prominent location near the dryer.
IMPORTANT
YOU MUST DISCONNECT AND LOCKOUT THE ELECTRIC SUPPL Y 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.
«Attention: Lor des opérations d’entretien
“Caution: Label all wires prior to
disconnection when servicing controls. W iring
errors can cause improper operation.”
des commandes étiqueter tous fils avant
de les déconnecter. Toute erreur de
câblage peut étre une source de danger et
de panne.»
CAUTION
DRYER(S) SHOULD NEVER BE LEFT UNA TTENDED WHILE IN OPERA TION.
WARNING
CHILDREN SHOULD NOT BE ALLOWED T O PLA Y ON OR NEAR THE DR YER(S).
CHILDREN SHOULD BE SUPERVISED IF NEAR DR YER(S) IN OPERA TION.
FOR YOUR SAFETY
DO NOT DRY MOP HEADS IN THE DRYER.
DO NOT USE DR YER IN THE PRESENCE OF DRY CLEANING FUMES.
WARNING
UNDER NO CIRCUMSTANCES should the dryer door switch, the lint drawer switch,
or the heat safety circuit ever be disabled.
WARNING
The dryer must never be operated with any of the back guards, outer tops, or service
panels removed. PERSONAL INJURY OR FIRE COULD RESUL T .
WARNING
DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FIL TER/SCREEN IN
PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED.
IMPORTANT
PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment and/or
specified in the installation manual included with the dryer.
Dryer must not be installed or stored in an area where it
The wiring diagram for the dryer is located in the front electrical control box area.
will be exposed to water or weather.
IMPORTANT
Dryer must be installed in a location/environment, which the ambient temperature
remains between 40° F (4.44° C) and 130° F (54.44° C).
A. Specifications.......................................................................................................................................... 4
A. Location Requirements........................................................................................................................... 6
B. Unpacking/Setting Up............................................................................................................................. 7
C. Dryer Enclosure Requirements .............................................................................................................. 9
D. Fresh Air Supply Requirements............................................................................................................ 10
E. Exhaust Requirements.......................................................................................................................... 11
F. Electrical Information ........................................................................................................................... 17
G. Gas Information .................................................................................................................................... 20
H. Steam Information ................................................................................................................................24
I.Preparation for Operation/Start-Up...................................................................................................... 28
K. Compressed Air Requirements ............................................................................................................. 31
L. Shutdown Instructions .......................................................................................................................... 32
SECTION IV
SERVICE/PARTS INFORMATION ...........................................................................................................33
A. Service ..................................................................................................................................................33
B. Parts ...................................................................................................................................................... 33
SECTION V
WARRANTY INFORMATION ...................................................................................................................34
A. Returning Warranty Cards ................................................................................................................... 34
B. Warranty ............................................................................................................................................... 34
C. Returning Warranty Parts ..................................................................................................................... 34
A. Cleaning ................................................................................................................................................36
B. Adjustments .......................................................................................................................................... 38
C. Lubrication ............................................................................................................................................38
DATA LABEL INFORMATION .................................................................................................................40
SECTION IX
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMPONENTS ...................41
SECTION X
FIRE SUPPRESSION SYSTEM ..................................................................................................................43
SECTION I
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. PERSONAL INJURY OR FIRE COULD RESUL T .
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
e. Immediately call your gas supplier from a neighbor’ s phone. Follow the gas supplier’s instructions.
f. If you
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 dryer, there are some articles that, due to fabric composition or
cleaning method, should not be dried in it.
cannot reach your gas supplier, call the fire department.
ALL occupants.
WARNING: Dry only water washed fabrics. DO NOT dry articles spotted or washed in dry
cleaning solvents, a combustible detergent, or “all purpose” cleaner . EXPLOSION
COULD RESUL T .
WARNING: DO NOT dry rags or articles coated or contaminated with gasoline, kerosene, oil, paint,
or wax. EXPLOSION COULD RESUL T .
WARNING: DO NOT dry mop heads. Contamination by wax or flammable solvents will create a
fire hazard.
WARNING: DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or
similarly textured rubberlike materials. Drying in a heated basket (tumbler) may damage
plastics or rubber and may be a fire hazard.
2American Dryer Corp.113406-1
7. A program should be established for the inspection and cleaning of lint in the burner area, exhaust ductwork,
and area around the back of the dryer. The frequency of inspection and cleaning can best be determined
from experience at each location.
WARNING: The collection of lint in the burner area and exhaust ductwork can create a potential fire
hazard.
8. For personal safety, the dryer must be electrically grounded in accordance with local codes and/or the
National Electrical Code ANSI/NFPA NO. 70-LATEST EDITION, or in Canada, the Canadian Electrical
Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION.
NOTE: Failure to electrically ground the dryer properly will VOID THE WARRANTY.
9. UNDERNOCIRCUMSTANCES should the dryer door switch, the lint drawer switch, or the heat
safety circuit ever be disabled.
W ARNING: PERSONAL INJURY OR FIRE COULD RESUL T SHOULD THE DR YER
DOOR SWITCH, THE LINT DRAWER SWITCH, OR THE HEA T SAFETY
CIRCUIT EVER BE DISABLED.
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 (8.62 bar) steam pressure. Excessive steam
pressure can damage the steam coil and/or harm personnel.
13. Replace leaking flexible steam hoses or other fixtures immediately. DO NOT operate the dryer with
leaking flexible hoses. PERSONAL INJURY MAY RESULT.
14. READ AND FOLLOW ALL CAUTION AND DIRECTION LABELS ATTACHED TO THE DRYER.
15. For safety, proper operation, and optimum performance, the dryer must not be operated with a load less
than sixty-six percent (66%), 112 lbs (51 kg) of its rated capacity.
W ARNING: YOU MUST DISCONNECT AND LOCKOUT THE ELECTRIC SUPPLY AND
THE GAS SUPPL Y OR THE STEAM SUPPL Y BEFORE ANY COVERS OR
GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS
FOR CLEANING , ADJUSTING, INSTALLA TION, OR TESTING OF ANY
EQUIPMENT PER OSHA (Occupational Safety and Health Administration)
STANDARDS.
IMPORTANT: Dryer must be installed in a location/environment, which the ambient
temperature remains between 40° F (4.44° C) and 130° F (54.44° C).
113406-1www.amdry.com3
A. SPECIFICATIONS
SECTION II
SPECIFICATIONS
MAXIMUM CAPACITY (DRY WEIGHT)170 lb
TUMBLER DIAMETER51-1/2”
TUMBLER DEPTH42-3/4”
TUMBLER VOLUME51.50 cu ft
TUMBLER/DRIVE MOTO R3 hp
BLOWER/FAN MOTOR7- 1/2 hp
DOOR OPENING (DIAMETER)31-3/8”
DOOR SILL HEIGHT36-1/2”
WATER C O NNECTION3 /4”-11.5 NH
DRYERS PER 20’/40’ CONTAINER3 / 7
DRYERS PER 48’/53’ TRUCK8 / 8
VOLTAGE AVAILABLE208-575v 3ø 3,4w 50/60 Hz
APPROX. NET WEIGHT1,8 48 lb
APPROX. SHIPPING WEIGHT2,0 14 lb
AIRFLOW3 ,70 0 cf m
HEAT INPUT395,000 Btu/hr
EXHAUST CON NECTION (DIAME TER)12”
GasSteamElectric
COMPRESSED AIR CONNECTION1/4” Quick Connection
COMPRESS ED AIR VOLUME4.25 cfh
INLET PIP E C O N NECTION1-1/ 2” F.N .P.T.
VOLTAGE AVAILABLE
APPROX. NET WEIGHT
APPROX. SHIPPING WEIGHT
AIRFLOW
EXHAUST CON NECTION (DIAME TER)
COMPRESS ED AIR CONNECTION
COMPRESS ED AIR VOLUME
OVEN SIZE
kWBtu/hr
VOLTAGE AVAILABLE
APPROX. NET WEIGHT
APPROX. SHIPPING WEIGHT
AIRFLOW
STEAM CONSUMPTION
OPERATING STEAM PRESSURE
EXHAUST CON NECTION (DIAME TER)
COMPRESS ED AIR CONNECTION
COMPRESS ED AIR VOLUME
BOILER HP (NORMAL LOAD)
SUPPLY CONNECTION
RETURN CONNE CTION
kcal/hr
99,5 38 kca l/hr
N / A
N / A
77.11 kg
130.81 cm
108.59 cm
1.458 cu m
2.24 kW
5.59 kW
79.71 cm
92.71 cm
838.24 kg
913.54 kg
104.77 cmm
30.48 cm
0.12 cmh
Shaded areas are stated in metric equivalents
IMPORTANT : Gas dryers and steam dryers must be provided with a clean, dry, regulated 80 psi +/-
10 psi (5.51 bar +/- 0.68 bar) air supply .
NOTE: ADC reserves the right to make changes in specifications at any time without notice or
obligation.
4American Dryer Corp.113406-1
SPECIFICA TIONS – GAS AND STEAM
NOTE: ADC reserves the right to make changes in specifications at any time without notice or
obligation.
113406-1www.amdry.com5
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 S tandards: ANSI Z223.1LATEST EDITION (National Fuel Gas Code) or ANSI/NFPA NO. 70-LATEST EDITION (National Electrical
Code) or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1-M91
(Natural Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [L.P.] Gas) or LATEST EDITION (for General
Installation and Gas Plumbing) or Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION
(for Electrical Connections).
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, or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1M91 (Natural Gas) or CAN/CGA-B149.2-M91 (L.P. Gas) or LATEST EDITION (for General Installation and
Gas Plumbing).
1. The dryer must be installed on a sound level floor capable of supporting its weight. Carpeting must be
removed from the floor area that the dryer is to rest on.
IMPORTANT : “The dryer must be installed on noncombustible floors only.”
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 SupplyRequirements in Section D).
5. Clearance provisions must be made from combustible construction as noted in this manual (refer to DryerEnclosure 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. The dryer must be installed with a proper exhaust duct connection to the outside as noted in this manual
(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 this manual
(refer to Exhaust Requirements in Section E).
IMPORTANT : Dryer should be located where a minimum amount of exhaust duct willbe necessary .
9. The dryer must be installed with adequate clearance for air openings into the combustion chamber.
6American Dryer Corp.113406-1
CAUTION: This dryer produces combustible lint and must be exhausted to the outdoors. Every 6
months, inspect the exhaust ducting and remove any lint buildup.
IMPORTANT: Dryer must be installed in a location/environment, which the ambient
temperature remains between 40° F (4.44° C) and 130° F (54.44° C).
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. T o remove
skid from the dryer, locate and remove the four (4) lag bolts securing the base of the dryer to the wooden skid.
Two (2) are at the rear base, and two (2) are located in the bottom of the lint chamber. To remove the two (2)
lag bolts located in the lint chamber area, remove the lint drawer and the three (3) Phillips head screws securing
the lint door in place.
1. Leveling Dryer
a. T o level the dryer , place 4-inch (10.16 cm) square metal shims or other suitable material under the base
pads (refer to the illustration above). It is suggested that the dryer be tilted slightly to the rear.
b. The V-belts are disconnected from the basket (tumbler) drive motor for shipping. Reconnect V-belts
before starting the dryer.
113406-1www.amdry.com7
2. If more headroom is needed when moving the dryer into position, the top console (module) may be removed.
T o Remove T op Console (module):
a. Disconnect the ground wire (A in the illustration below) located at the rear upper left corner of the
dryer.
b. Remove the eight (8) sets of nuts and washers (B in the illustration below) holding the console
(module) to the base.
c. Disconnect the white plug connector (C in the illustration below) located on the top of the rear
electric service/relay box (provides power to the heat circuit).
d. Disconnect air connection from the 3-way micro valve.
e. Lift the console (module) off of the dryer base.
IMPORTANT : The dryer must be transported and handled in an upright position at ALL times.
8American Dryer Corp.113406-1
C. DRYER ENCLOSURE REQUIREMENTS
Even though a 12-inch (30.48 cm) clearance is acceptable, it is recommended that the rear of the dryer be
positioned approximately 24-inches (60.96 cm) from the nearest obstruction (i.e., wall) for ease of installation,
maintenance, and service. Bulkheads and partitions should be made from noncombustible materials. The
clearance between the bulkhead header and the dryer must be a minimum of 4-inches (10.16 cm) and must not
extend more than 4-inches (10.16 cm) to the rear of the front. A 2-inch (5.08 cm) clearance is required between
the bulkhead facing and the top of the dryer.
NOTE: Bulkhead facing should not be installed until after the dryer is in place. Ceiling area must be
located a minimum of 12-inches (30.48 cm) above the dryer top console (module) and
18-inches (45.72 cm) for steam models.
NOTE: When fire sprinkler systems are located above the dryers, a minimum of 18-inches (45.72 cm)
above the dryer console (module) is required. Dryers may be positioned sidewall to sidewall,
however, 1 or 2-inches (2.54 or 5.08 cm) is suggested for ease of installation and
maintenance. Allowances must be made for the opening and closing of the control door and
the lint door.
113406-1www.amdry.com9
D. FRESH AIR SUPPLY REQUIREMENTS
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
sail switch “fluttering” problems may result, as well as premature motor failure from overheating. The dryer
must be installed with provisions for adequate combustion and make-up air supply.
Air supply (make-up air) must be given careful consideration to ensure proper performance of each dryer . An
unrestricted source of air is necessary for each dryer. As a general rule, an unrestricted air entrance from the
outdoors (atmosphere) of a minimum of 4 square feet (0.37 square meters) is required for each gas dryer and a
minimum of 4.75 square feet (0.44 square meters) for each steam dryer.
T o 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.
is not necessary to have a separate make-up air opening for each dryer. Common make-up air openings are
It
acceptable. However, they must be set up in such a manner that the make-up air is distributed equally to
the dryers.
EXAMPLE: For a bank of six (6) dryers, two (2) unrestricted openings measuring 3 feet by 4 feet (0.91 meters
by 1.22 meters) are acceptable.
will be adversely affected. Ignition problems and
ALL
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 the motors and other dryer components.
NOTE: Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY.
10American Dryer Corp.113406-1
E. EXHAUST REQUIREMENTS
1. General Exhaust Ductwork Information
Exhaust ductwork should be designed and installed by a qualified professional. Improperly sized ductwork
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-heat thermostats. The dryer must be installed with a proper exhaust duct connection to the outside.
CAUTION: This dryer produces combustible lint and must be exhausted to the outdoors.
CAUTION: IMPROPERL Y SIZED OR INST ALLED EXHAUST DUCTWORK CAN
CREATE A POTENTIAL FIRE HAZARD.
NOTE: When a dryer is exhausted separately , it is recommended that a back draft damper be
installed.
NOTE: When dryers are exhausted into a multiple (common) exhaust line, each dryer must be
supplied with a back draft damper .
The ductwork should be laid out in such a way that the ductwork travels as directly as possible to the
outdoors with as few turns as possible. Single or independent dryer venting is recommended.
When single dryer venting is used, the ductwork from the dryer to the outside exhaust outlet should notexceed 15 feet (4.57 meters). In the case of multiple (common) dryer venting, the distance from the last
dryer to the outside exhaust outlet should not exceed 15 feet (4.57 meters). The shape of the ductwork
is not critical as 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/angles instead. The radius of the elbows should preferably be
1-1/2 times the diameter of the duct. Excluding basket (tumbler)/dryer elbow connections or elbows used
for outside protection from the weather, no more than three (3) elbows should be used in the exhaust duct
run. If more than three (3) elbows are used, the cross-sectional area of the ductwork must be increased
in proportion to the number of elbows used.
ALL ductwork 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 ductwork 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 ductwork for periodic
inspection and cleaning of lint from the ductwork.
IMPORTANT : Exhaust back pressure measured by a manometer in the exhaust duct must be no less
than 0 and must not exceed 0.3 inches (0.74 mb) of water column (W .C.).
NOTE: When the exhaust ductwork passes through a wall, ceiling, or roof made of combustible
materials, the opening must be 2-inches (5.08 cm) larger than the duct (all the way around).
The duct must be centered within this opening.
113406-1www.amdry.com11
NOTE: As per the National Fuel Gas Code, “Exhaust ducts for T ype 2 clothes dryers shall be
constructed of sheet metal or other noncombustible material. Such ducts shall be equivalent in
strength and corrosion resistance to ducts made of galvanized sheet steel not less than 26
gauge (0.0195-inches [0.5 mm]) thick.”
IMPORTANT : It is recommended that exhaust or booster fans not be used in the exhaust ductwork
system.
Outside Ductwork Protection
T o protect the outside end of horizontal ductwork from the weather, a 90° elbow bent downward should be
installed where the exhaust exits the building. If the ductwork 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, louvers, or caps on the outside opening of the exhaust
ductwork.
2. Single Dryer Venting
Where possible, it is suggested to provide a separate exhaust duct for each dryer. The exhaust duct shouldbe laid out in such a way that the ductwork 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 ductwork is not critical as long as the minimum cross section area is
provided.
IMPORTANT : The minimum duct size for a gas unit is 12-inches (30.48 cm) for a round duct and
10-inches x 10-inches (25.4 cm x 25.4 cm) for a square duct. The minimum duct size
for a steam unit is 20-inches (50.80 cm) for a round duct and 18-inches x
18-inches (45.72 cm x 45.72 cm) for a square duct. THE DUCT SIZE MUST
NOT BE REDUCED ANYWHERE DOWNSTREAM OF THE DRYER.
12American Dryer Corp.113406-1
IMPORTANT : Exhaust back pressure measured by a manometer at each basket (tumbler) exhaust
duct area must be no less than 0 and must not exceed 0.3 inches (0.74 mb) of water
column (W .C.).
It is suggested that the ductwork from each dryer not exceed 15 feet (4.57 meters) with no more than three
(3) elbows (excluding dryer connections). If the ductwork exceeds 15 feet (4.57 meters) or has numerous
elbows, the cross-sectional area of the ductwork must be increased in proportion to the length and number
of elbows in it. In calculating duct size, the cross-sectional area of a square or rectangular duct must be
increased twenty percent (20%) for each additional 15 feet (4.57 meters). The diameter of a round
exhaust duct should be increased ten percent (10%) for each additional 10 feet (3.04 meters). Each 90º
elbow is equivalent to an additional 40 feet (12.19 meters), and each 45º elbow is equivalent to an additional
20 feet (6.09 meters).
IMPORTANT : For extended ductwork runs, the cross section area of the ductwork can only be
increased to an extent. Maximum proportional ductwork runs cannot exceed 15 feet
(4.57 meters) more than the original limitations of 15 feet (4.57 meters) with three (3)
elbows. When the ductwork approaches the maximum limits as noted in this manual,
a professional heating, ventilating, and air-conditioning (HVAC) firm should be
consulted for proper venting information.
ALL ductwork 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 ductwork 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 ductwork for periodic
inspection and cleaning of lint from the ductwork.
113406-1www.amdry.com13
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