American Dryer Corp. EURO-24 User Manual
EURO-24
8-Inch Exhaust Duct
Installation Manual
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.
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 dans
le voisinage de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR
DE GAZ:
* Ne pas tenter d’allumer d’appareil.
* Ne touchez à aucun interrupteur. Ne pas
vous servir des téléphones se trouvant dans
le bâtiment où vous vous trouvez.
* 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.
031901JEV/calbert
For replacement parts, contact the reseller from which the dryer
was purchased or
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. 113323
Retain This Manual In A Safe Place For Future Reference
American Dryer Corporation products embody advanced concepts in engineering, design, and safety. If this product is
properly maintained, it will provide many years of safe, efficient, and trouble-free operation.
ONLY qualified technicians should service this equipment.
OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation manual included with
the dryer.
The following “FOR YOUR SAFETY” caution must be posted near the dryer in a prominent location.
FOR YOUR SAFETY
Do not store or use gasoline or
other flammable vapors or
liquids in the vicinity of this or
any other appliance.
W e have tried to make this manual as complete as possible and hope you will find it useful. ADC reserves the right to make
changes from time to time, without notice or obligation, in prices, specifications, colors, and material, and to change or
discontinue models.
POUR VOTRE SÉCURITÉ
Ne pas entreposer ni utiliser d’essence
ni d’autres vapeurs ou liquides
inflammables dans le voisinage de cet
appareil ou de yout autre appareil.
Important
For your convenience, log the following information:
DA TE OF PURCHASE______________________________ MODEL NO. __________________________________________
RESELLER’S NAME ________________________________________________________________________________________
Serial Number(s) ________________________________________________________________________________________
EURO-24
________________________________________________________________________________________
________________________________________________________________________________________
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 orders directly to the ADC Parts Department at (508) 678-
9000. Please specify the dryer model number and serial number in addition to the description and part number, so that your
order is processed accurately and promptly.
“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
DR YERS SHOULD NEVER BE LEFT UNA TTENDED WHILE IN OPERA TION.
WARNING
CHILDREN SHOULD NOT BE ALLOWED TO PLA Y ON OR NEAR THE DRYERS.
CHILDREN SHOULD BE SUPERVISED IF NEAR DR YERS IN OPERA TION.
FOR YOUR SAFETY
DO NOT DR Y MOP HEADS IN THE DRYER.
DO NOT USE DR YER IN THE PRESENCE OF DR Y CLEANING FUMES.
WARNING
UNDER NO CIRCUMSTANCES should the dryer door switch, lint drawer switch, or
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 or
specified in the installation manual included with the dryer.
Dryers must not be installed or stored in an area where it will be exposed to water or weather.
The wiring diagram for the dryer is located in the front electrical control box area.
Table of Contents
SECTION I
IMPORTANT INFORMATION ...............................................................................3
A. Receiving and Handling ............................................................................................................... 3
B. Safety Precautions ...................................................................................................................... 4
SECTION II
SPECIFICATIONS ....................................................................................................6
A. Specifications .............................................................................................................................. 6
SECTION III
INSTALLATION PROCEDURES .......................................................................... 8
A. Unpacking/Setting Up ................................................................................................................. 8
B. Location Requirements ................................................................................................................ 9
C. Dryer Enclosure Requirements ................................................................................................... 10
D. Fresh Air Supply Requirements.................................................................................................. 11
E. Exhaust Requirements ............................................................................................................... 12
F. Electrical Information ................................................................................................................. 18
G . Gas Information ........................................................................................................................ 24
H. Steam Information ..................................................................................................................... 28
I. Preparation For Operation/Start-Up .......................................................................................... 33
J. Preoperational T ests .................................................................................................................. 34
K. Preoperational Instructions ........................................................................................................ 35
L. Shut Down Instructions ............................................................................................................. 39
SECTION IV
SERVICE/PARTS INFORMATION ......................................................................40
A. Service ..................................................................................................................................... 40
B. Parts ......................................................................................................................................... 40
SECTION V
WARRANTY INFORMATION .............................................................................. 41
A. Returning W arranty Card(s) ...................................................................................................... 41
B. W arranty................................................................................................................................... 41
C. Returning W arranty Part(s) ........................................................................................................ 41
SECTION VI
ROUTINE MAINTENANCE .................................................................................. 43
A. Cleaning ................................................................................................................................... 43
B. Adjustments .............................................................................................................................. 44
C. Lubrication ............................................................................................................................... 44
D. Lint Drawer Removal ................................................................................................................ 45
SECTION VII
TROUBLESHOOTING...........................................................................................46
Microprocessor Controller (Computer) Models .............................................................................. 46
Dual Timer Models ......................................................................................................................... 53
SECTION VIII
DATA LABEL INFORMATION ............................................................................. 5 6
A. Data Label................................................................................................................................. 56
SECTION IX
REVERSING TIMER SPIN/DWELL ADJUSTMENTS .................................... 58
SECTION X
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT
COMPONENTS .......................................................................................................59
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 packaging, and wooden
skid should be visually inspected for shipping damage. If any damage whatsoever is noticed, inspect further
before delivering carrier leaves.
Dryers damaged in shipment:
1. ALL dryers should 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/parts damaged in transit cannot be claimed 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 : The dryer must be transported 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. PERSONAL INJURY or FIRE COULD RESULT.
1. DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
2. Purchaser/user should consult the local gas supplier for proper instructions to be followed in the event the
user smells gas. The instructions should be posted in a prominent location.
3. WHAT TO DO IF YOU SMELL GAS...
a. DO NOT try to light any appliance.
b. DO NOT touch any electrical switch.
c. DO NOT use any phone in your building.
d. Clear the room, building, or area of ALL occupants.
e. Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
f. If you cannot reach your gas supplier, call the fire department.
4. Installation and service must be performed by a qualified installer, service agency, or gas supplier.
5. Dryer(s) must be exhausted to the outdoors.
6. Although ADC produces a very versatile dryer, there are some articles that, due to fabric composition or
cleaning method, should not be dried in it.
WARNING : Dry only water washed fabrics. DO NOT dry articles spotted or washed in dry
cleaning solvents, a combustible detergent, or “all purpose” cleaner.
EXPLOSION COULD RESULT.
WARNING : DO NOT dry rags or articles coated or contaminated with gasoline, kerosene, oil, paint,
or wax.
EXPLOSION COULD RESULT.
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.
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 do so will VOID THE WARRANTY.
9. UNDER NO CIRCUMSTANCES should the dryer door switch, lint drawer switch, or heat safety circuit
ever be disabled.
WARNING : PERSONAL INJURY or FIRE COULD RESULT.
10. This dryer is not to be used in the presence of dry cleaning solvents or fumes.
11. Remove articles from the dryer as soon as the drying cycle has been completed.
WARNING: Articles left in the dryer after the drying and cooling cycles have been completed can
create a fire hazard.
12. READ and FOLLOW ALL CAUTION and DIRECTION LABELS ATTACHED TO THE DRYER.
WARNING : YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and
THE GAS SUPPLY or THE STEAM SUPPLY 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
A. SPECIFICATIONS
MAXIMUM CAPACITY (DRY WEIGHT) 50 lbs. 22.7 kg
BASKET (TUMBLER) DIAMETER 32-3/4" 83.2 cm
BASKET (TUMBLER) DEPTH 37-1/2" 95.3 cm
BASKET (TUMBLER) MOTOR 3/4 HP* 0.560 kw
DOOR OPENING (DIAMETER) 21-1/2" 54.61 cm
BASKET (TUMBLER) VOLUME 18.3 cu. ft. 0.518 cu.m.
DRYERS PER 20'/40' CONTAINER 10/20
DRYERS PER 45'/48' TRUCK 24/26
VOLTAGE AVAILABLE 120-460v 1ø - 3ø 3, 4w 50/60 Hz
APPROX. WEIGHT (UNCRATED) 651 lbs. 295.3 kg
APPROX. WEIGHT (CRATED) 700 lbs. 317.7 kg
HEAT INPUT 150,000 btuh 37,800 kcal/hr
Gas
AIRFLOW 750 cfm 21 cmm
INLET PIPE CONNECTION 1/2" F.P.T.**
OVEN SIZE
KW
20 68,280 17,200
24 81,960 20,650
25 N/A 21,510
30 102,450 25,810
KW
ElectricSteam****
20 103 -- 90 87 -- -- -- -- 33 -- -- -- -24 -- -- -- -- 70 -- 61 -- -- -- 36 31 -25 -- -- -- -- -- -- -- -- 40 -- -- -- -30 -- -- -- -- 86 -- 75 -- -- -- 44 38 --
VOLTAGE AVAILABLE 120-460v 1ø - 3ø 3, 4w 50/60 Hz
APPROX. WEIGHT (UNCRATED) 683 lbs. 309.9 kg
APPROX. WEIGHT (CRATED) 733 lbs. 332.3 kg
AIRFLOW 750 cfm 21 cmm
COMPRESSED AIR VOLUME 0.75 cfh 0.02 cmh
AIR CONNECTION 1/8" F.P.T.
Shaded areas are stated in metric equivalents
BTUH
(60 HZ)
STEAM CONSUMPTION BOILER HP NORMAL LOAD
142 lbs/hr 64.26 kg/hr 4.1
OPERATING PRESSURE SUPPLY CONNECTION** RETURN CONNECTION
125 PSI max 8.6 bar 1" 1"
KCAL/HR
(50 Hz)
APPLIED VOLTAGE/PHASE/APPROX. AMP DRAW***
208/1ø 240/1ø 208/3ø 240/3ø 380/3ø 416/3ø 460/3ø
60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 50/60 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz
* Euro-24 reversing dryer available with 3-phase (3ø) motors standard (1/2 HP [0.37 kw] motors).
** Size of piping to dryer varies with installation conditions. Contact factory for assistance.
*** Contact factory for information not listed, 3-phase (3ø) figures shown are for 3-wire service.
**** Specify air-operated or electromechanical steam damper system. Air-operated steam damper system
must be provided with clean, dry and regulated 80 PSI +/-10 PSI or (5.51 bars +/- 0.69 bars) air supply.
NOTE: ADC reserves the right to make changes in specifications at any time without notice or
obligation.
Specifications
EURO-24
NOTE: ADC reserves the right to make changes in specifications at any time without notice or
obligation.
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SECTION III
INST ALLATION 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: 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. UNPACKING/SETTING UP
Remove protective shipping material (i.e., plastic wrap and optional shipping box) from dryer.
IMPORTANT : Dryer must be transported and handled in an upright position at ALL times.
NOTE: For OPL dryer models equipped with locks, the lock used is a dummy lock and no key is
supplied or needed. The lock can be turned with any key, a screwdriver, a small coin, or any
small sharp object. For coin-operated dryers, the MK-100 (master key for both the control
door and lint door) should be made accessible because it will be needed throughout various
phases in the installation of the dryer.
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.
1. Leveling Dryer
The dryer is equipped with four (4) leveling legs, one (1) 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.
B. 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-B149.1-M91 (Natural
Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [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 Supply
Requirements 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 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 will be necessary.
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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 (30.48 cm) above the dryer's outer top; 18-inches (45.72 cm) for steam dryers, except along the front
of the dryer which may be closed if desired.
NOTE: Allowances must be made for opening the control door.
X = 12-inch (30.48 cm) minimum, 24-inch (60.96 cm) suggested for ease of maintenance.
* 1-inch (2.54 cm) maximum for electric dryers.
** 18-inch (45.72 cm) minimum for steam dryers.
NOTE: Air considerations are important for proper and efficient operation.
Dryers may be positioned sidewall to sidewall. However, a 1/16” (1.5875 mm) minimum allowance must be
made for opening and closing of the control door. It is suggested that the dryer be positioned about 2 feet (0.61
meters) 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.
D. FRESH AIR SUPPLY REQUIREMENTS
The EURO-24 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. As a general rule, an unrestricted air
entrance from the outdoors (atmosphere) of a minimum of 1-1/2 square feet (0.14 square meters) is required for
each dryer. If registers or louvers are installed over the openings, then the area must be increased. 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 the dryers.
EXAMPLE: For a bank of eight (8) dryers, two (2) unrestricted openings measuring 2 feet by 3 feet
(0.61 meters by 0.91 meters), 6 square feet (0.56 square meters) are acceptable.
IMPORTANT : Make-up air openings should not be located in an area directly near where exhaust
vents exit the building.
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.
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E. EXHAUST REQUIREMENTS
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, and shutdown of the burner
by the airflow (sail) switch, burner hi-limit, or lint chamber hi-heat protector thermostat.
Where possible, it is suggested to provide a separate (single) exhaust duct for each dryer.
CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUST DUCTWORK CAN
CREATE A POTENTIAL FIRE HAZARD.
CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
The exhaust 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. The shape of the ductwork is not critical so long as the minimum cross
section area is provided. Single or independent dryer venting is recommended.
It is suggested that the use of 90° turns be avoided; use 30° or 45° angles instead.
The ductwork should be smooth inside with no projections from sheet metal screws or other obstructions, which
will collect lint. When adding ducts, the ducts to be added should overlap the duct to which it is connected. ALL
ductwork joints must be taped to prevent moisture and lint from escaping into the building. Additionally, inspection
doors should be installed at strategic points in the exhaust ductwork for periodic inspection and cleaning.
IMPORTANT : When connecting ductwork to the dryer exhaust duct, be sure that when screws are
used they DO NOT restrict the operation (both opening and closing) of the damper.
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.
To protect the outside end of the 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 (i.e., roof or ground level).
IMPORTANT : DO NOT use screens, louvers, or caps on the outside opening of the exhaust
ductwork.
IMPORTANT : Exhaust back pressure measured by a manometer at the dryer exhaust duct area must
not exceed 0.3 inches (0.75 mb) of water column (W.C.).
SINGLE DRYER VENTING
IMPORTANT : For exhaust duct runs over 20 feet (6.09 meters) a minimum size of 10-inches (25.4
cm) must be used.
HORIZONTAL VENTING
When a single 8-inch (20.32 cm) horizontal vent is used, the ductwork to the outlet cannot exceed 20 feet (6.09
meters), refer to Illus. A below. This calculation of 20 feet (6.09 meters) compensates or allows for the use of
a maximum of only one (1) elbow (which is the outside outlet protection).
Illus. A
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VERTICAL VENTING
When vertical single 10-inch (25.4 cm) venting is used (refer to Illus. B below), the ductwork from the dryer to
the outside outlet cannot exceed 40 feet (12.19 meters), refer to Illus. B below. This calculation compensates
for the use of a maximum of three (3) elbows including the two (2) elbows creating the 180° (turned downward)
outside outlet.
Illus. B
If the length of the duct run or quantity of elbows used exceeds the above noted specifications, the cross section
area of the ductwork must be increased in proportion to the number of elbows or duct run added.
IMPORTANT: For extended ductwork runs, the cross section area of the duct can only be increased
to an extent. For extended ductwork runs, a professional heating, venting, and air
conditioning (HVAC) firm should be consulted for proper venting information.
MULTIPLE DRYER (COMMON) VENTING
If it is not feasible to provide separate exhaust ducts for each dryer, ducts for individual dryers may be channeled
into a common main duct. Each dryer is provided with a back draft damper. The individual ducts should enter the
bottom or side of the main duct at an angle not more than 45° in the direction of the airflow.
The main common duct may be any shape so long as the minimum cross-sectional area is provided. The main
duct should be tapered with the diameter increasing before each individual 8-inch (20.32 cm) duct is added
(refer to Illus. C for Horizontal Venting and Illus. D for Vertical Venting).
IMPORTANT : No more than four (4) dryers maximum should be connected to one (1) main
common duct with a vertical run.
NOTE: Distance between dryer single ducts being connected to the main common duct must be a
minimum of 34-1/4” (87 cm) dryer width.
Ductwork should be laid out in such a manner where allowances are made at rear area of the
dryer for removal of rear service panels or guards.
The illustrations on page 16 show the minimum cross section area for multiple dryer venting. These figures
must be increased in proportion if the main duct run from the last dryer to where it exhausts has numerous
elbows or is unusually long.
IMPORTANT : For extended ductwork runs, the cross section area of the duct can only be increased
to an extent. For extended ductwork runs, a professional heating, venting, and air
conditioning (HVAC) firm should be consulted for proper venting information.
Refer to page 16 for Multiple Dryer Horizontal Venting and Vertical Venting examples/illustrations.
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HORIZONTAL VENTING
Illus. C
VERTICAL VENTING
Illus. D
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