American Dryer Corp. AD-25V Administrator Guide

120299EL/abe ADC Part No. 113042
AD-25V
Installation/Operator's Manual
For replacement parts, contact the distributor from which the dryer
was purchased or
American Dryer Corporation
88 Currant Road
Fall River MA 02720-4781
Telephone: [phone] / Fax: [phone]
e-mail: [email protected]
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.

Retain This Manual In A Safe Place For Future Reference
Replacement parts can be obtained from your distributor or the ADC factory. When ordering replacement parts from the
factory, you can FAX your order toADC at [phone] or telephone your orders directly to the ADCPartsDepartmentat
[phone]. Please specify the dryermodelnumber andserialnumberin addition to thedescription andpartnumber,so
that your order is processed accurately and promptly.
DATE OF PURCHASE MODEL NO.
DISTRIBUTORS NAME
Serial Number(s)
AD-25V
“IMPORTANT NOTE TO PURCHASER”
Information must be obtained from your local gas supplier on the instructions
to be followed if the user smells gas. These instructions must be posted in a
prominent location near the dryer.
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.
OBSERVEALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation/operator's manual
included with the dryer.
The following “FOR YOUR SAFETY” caution must be posted near the dryer in a prominent location.
FOR YOUR SAFETY
Do not store or use gasoline or
other flammable vapors or liquids
in the vicinity of this or any other
appliance.
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.
We have tried to make this manual as complete as possible and hope you will find it useful. ADC reserves the right to make
changes from time to time, without notice or obligation, in prices, specifications, colors, and material, and to change or
discontinue models.
Important
For your convenience, log the following information:

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, AD-
JUSTING, INSTALLATION, or TESTING OF ANY EQUIPMENT per OSHA (Oc-
cupational Safety and Health Administration) STANDARDS.
CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR THE
DRYER(S). CHILDREN SHOULD BE SUPERVISED IF NEAR DRYER(S) IN
OPERATION.
WARNING
DRYER(S) SHOULD NEVER BE LEFT UNATTENDED WHILE IN OPERATION.
CAUTION
FOR YOUR SAFETY
DO NOT DRY MOP HEADS IN THE DRYER.
DO NOT USE DRYER IN THE PRESENCE OF DRY CLEANING FUMES.
WARNING
UNDER NO CIRCUMSTANCES should the door switch or the heat circuit devices
ever be disabled.
“Caution: Label all wires prior to
disconnection when servicing controls. Wiring
errors can cause improper operation.”
«Attention: Lor des opérations
d’entretien des commandes étiqueter tous
filsnt de les déconnecter. Toute erreur de
câblage peut étre une source de danger et
de panne.»

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.
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.
The wiring diagram for the dryer is located in the front electrical control box area.
DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER/SCREEN
IN PLACE...EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED.
WARNING

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 ........................................................................................................................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 Tests .................................................................................................................. 34
K. Preoperational Instructions ........................................................................................................ 35
L. Shut Down Instructions ............................................................................................................. 38
SECTION IV
SERVICE/PARTS INFORMATION .................................................................39
A. Service ..................................................................................................................................... 39
B. Parts ......................................................................................................................................... 39
SECTION V
WARRANTY INFORMATION .........................................................................40
A. Returning Warranty Card(s)....................................................................................................... 40
B. Warranty................................................................................................................................... 40
C. Returning Warranty Part(s) ........................................................................................................ 40

SECTION VI
ROUTINE MAINTENANCE ............................................................................42
A. Cleaning ................................................................................................................................... 42
B. Adjustments ............................................................................................................................. 43
C. Lubrication ............................................................................................................................... 43
D. Lint Drawer Removal................................................................................................................ 44
SECTION VII
TROUBLESHOOTING.....................................................................................45
Microprocessor (Computer) Models ............................................................................................... 45
Dual Timer Models ......................................................................................................................... 51
SECTION VIII
DATA LABEL INFORMATION........................................................................55
A. Data Label ............................................................................................................................... 55
SECTION IX
REVERSING TIMER SPIN/DWELL ADJUSTMENTS..................................57
SECTION X
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT
COMPONENTS ................................................................................................58
SECTION XI
BURNER AND LINT (TUMBLER) CHAMBER MANUAL RESET
HI-LIMIT INSTRUCTIONS .............................................................................61

3
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 theADC Traffic Manager at [phone].
IMPORTANT:The dryer must be transported and handled in an upright position at all times.

4
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 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,
or wax.
EXPLOSION COULD RESULT.

5
WARNING:DO NOT dry mop heads. Contamination by wax or flammable solvent will create a
fire hazard.
WARNING:DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or
similarly textured rubberlike materials. Drying in a heated basket (tumbler) may damage
plastics or rubber and also may be a fire hazard.
7. A program should be established for the inspection and cleaning of lint in the burner area, exhaust duct
work, and area around the back of the dryer. The frequency of inspection and cleaning can best be
determined from experience at each location.
WARNING:The collection of lint in the burner area and exhaust duct work can create a potential fire
hazard.
8. For personal safety, the dryer must be electrically grounded in accordance with local codes and/or the
NATIONAL ELECTRIC CODE ANSI/NFPA NO. 70-LATEST EDITION, or in Canada, the CANADIAN
ELECTRICAL CODES PARTS 1 & 2 CSA C22.1-1990 or LATEST EDITION.
NOTE:Failure to do so will VOID THE WARRANTY.
9. UNDER NO CIRCUMSTANCES should the dryer door switches, lint drawer switch, or heat safety
circuit, ever be disabled.
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 complete can create
a fire hazard.
12. READ and FOLLOWALLCAUTIONandDIRECTIONLABELSATTACHEDTO THEDRYER.
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.

6
SECTION II
SPECIFICATIONS
A. SPECIFICATIONS
*AD-25V reversing dryer available with 3-phase (3ø) 1/2 HP [.373 kw] motors standard.
** 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 (552 kPa ± 69 kPa) air supply.
NOTE:ADCreserves the right to make changes in specifications at any time without notice or
obligation.
GasElectric
Steam****
MAXIMUM CAPACITY (DRYWEIGHT)25 lbs. 11.3 kg
BASKET (TUMBLER)DIAMETER 32-3/4" 83.2 cm
BASKET (TUMBLER)DEPTH 19" 48.3 cm
BASKET (TUMBLER)MOTOR 1/2 HP* .373 kw
DOOR OPENING (DIAMETER)21-1/2" 54.61 cm
BASKET (TUMBLER)VOLUME 9.26 cu. ft. .262 cu.m.
DRYERS PER 20'/40' CONTAINER 14/30
DRYERS PER 45'/48' TRUCK 45/45
VOLTAGE AVAILABLE 120-460v / 1ø - 3ø / 3, 4w / 50/60 Hz
APPROX. WEIGHT (UNCRATED)407 lbs. 184.6 kg
APPROX. WEIGHT (CRATED)446 lbs. 202.1 kg
HEAT INPUT 78,000 btuh 19,656 kcal/hr
AIRFLOW 675 cfm 19 cmm
INLET PIPE CONNECTION 1/2" M.P.T.** --
OVEN SIZE
KW BTUH
(60 HZ)KCAL/HR (50 Hz)
15 N/A 12,900
18 61,450 15,485
20 68,250 17,200
24 81,900 20,638 APPLIED VOLTAGE/PHASE/APPROX. AMP DRAW***
KW 208/1ø 240/1ø 208/3ø 240/3ø 380/3ø 416/3ø 460/3ø
60 Hz 50 Hz 50/60 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz
15 -- -- -- -- -- -- -- -- 25 -- -- -- --
18 92 -- 80 53 -- 46 47 -- -- -- 27 25 --
20 101 -- 89 -- -- -- -- -- 33 -- -- -- --
24 -- -- -- 70 -- 61 62 -- -- -- 36 32 --
VOLTAGE AVAILABLE 120-460v / 1ø - 3ø / 3, 4w / 50/60 Hz
APPROX. WEIGHT (UNCRATED)435 lbs. 197.3 kg
APPROX. WEIGHT (CRATED)474 lbs. 214.8 kg
AIRFLOW 675 cfm 19 cmm
COMPRESSED AIR VOLUME .5 cfh .01 cmh
AIR CONNECTION 1/8" F.P.T. --
STEAM CONSUMPTION BOILER HP NORMAL LOAD
98.8 lbs/hr 44.8 kg/hr 2.9
OPERATING PRESSURE SUPPLY CONNECTION** RETURN CONNECTION
125 psi max 8.6 bar 1" -- 1/2" --
Shaded areas are stated in metric equivalents

7
Specifications
ADG-25V
ADE-25V
ADS-25V
NOTE:ADCreserves the right to make changes in specifications at any time without notice or
obligation.

8
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:
ANSI.Z223.1-LATEST EDITION (National Fuel Gas Code)
or
ANSI/NFPA NO. 70-LATEST EDITION (National Electric Code)
In CANADA, the installation must conform to CANADIAN STANDARDS:
CAN/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.2-M91 (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.
The basket (tumbler) of some 50 Hz model dryers are supported during shipping by a wooden block. REMOVE
THIS BLOCK BEFORE STARTING THE DRYER.
IMPORTANT:For microprocessor (computer) models, this wooden block must be removed before
connecting power to the dryer or irreparable damage to the basket (tumbler) will
result.

9
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.
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 Canadian Installation Codes CAN/CGA-B149.1-M91 (Natural Gas) or CAN/
CGA-B149.2-M91 (L.P. Gas) or LATEST EDITION.
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 non-combustible 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 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 this manual
(refer to Exhaust Requirements in Section E).
IMPORTANT:Dryer should be located where a minimum amount of exhaust duct will be necessary.

10
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.
NOTE:Air considerations are important for proper and efficient operation.
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. 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.
X = 12" (30.48 cm) minimum, 24" (60.96 cm) suggested for ease of maintenance.
*1" (2.54 cm) maximum for electric dryers.
** 18" (45.72 cm) minimum for steam dryers.

11
D. FRESH AIR SUPPLY
The AD-25V air supply (makeup 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 one (1) square foot (0.093 square meters) is required for each
dryer. If registers or louvers are installed over the openings, then the areamust be increased. It is not necessary
to have a separate make-up air openings for each dryer. Common make-up air openings are acceptable. How-
ever, 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 2 feet
(0.61 meters by 0.61 meters) (4 square feet [0.372 square meters]) is acceptable.
IMPORTANT:Makeup 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:Makeup air must be provided from a source free of dry cleaning solvent fumes.
Makeup 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.

12
E. EXHAUST REQUIREMENTS
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, 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 EXHAUSTDUCT WORKCAN
CREATE APOTENTIAL FIREHAZARD.
CAUTION:DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
The exhaust 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. The shape of the duct work 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 duct work 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
duct work 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 duct work for periodic inspection and
cleaning.
IMPORTANT:When connecting duct work 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 duct passes through a wall, ceiling, or roof made of combustible materials,
the opening must be 2-inches (5.04 cm) larger (all the way around) than the duct. The duct
must be centered within this opening.
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, itshould 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 or caps on the outside of opening of exhaust duct work.
IMPORTANT:Exhaust back pressure measured by a manometer at the dryer exhaust duct area must
not exceed 0.3 inches of water column (W.C.) - 0.74 millibars.

13
SINGLE DRYER VENTING
IMPORTANT:For exhaust duct runs over 25 feet (7.62 meters) a minimum size of 10-inches
(25.4 cm) must be used.
HORIZONTAL VENTING
When a single 8-inches (20.32 cm) horizontal vent is used, the duct work to the outlet cannot exceed 25 feet
(7.62 meters) - refer to Illus.A below. This calculation of25 feet (7.62 meters) compensates or allows for the
use of a maximum of only one (1) elbow (which is the outside outlet protection).
Illus. A

14
If the length of the duct run or quantity of elbows used exceeds the above noted specifications, the cross-
sectional area of the duct work must be increased in proportion to the number of elbows or duct run added.
IMPORTANT: For extended duct work runs, the cross-sectional area of the duct can only be
increased to an extent. For extended duct work runs, a professional HVAC firm
should be consulted for proper venting information.
VERTICAL VENTING
When vertical single 10-inch (25.4 cm) venting is used (refer to Illus. B below), the duct work from the dryer to
the outside outletcannot 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

15
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 thanfour (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).
Duct work 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 duct work runs, the cross-section area of the duct can only be increased
to an extent. For extended duct work runs, a professional HVAC firm should be
consulted for proper venting information.
Refer to page 16 for Multiple Dryer Horizontal Venting and Vertical Venting examples/illustrations.

16
HORIZONTAL VENTING
Illus. C
VERTICAL VENTING
Illus. D