American Dryer AD-758DV Parts Diagram

AD-758DV / ML-758DV

Installation Manual

Phase 7 / DSI / Dual Timer

WARNING: For your safety the information
in this manual must be followed to
minimize the risk of fire or explosion and
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.

— WHAT 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 FAIRE 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 USA

Telephone: [phone] / Fax: [phone]

e-mail: [e-mail]

www.adclaundry.com

ADC Part No. 113230-16

Retain This Manual in a Safe Place for Future Reference

This product embodies 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
and liquids in the vicinity of
this or any other appliance.

We have tried to make this manual as complete as possible and hope you will find it useful. The manufacturer 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:

DATE 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 FAX your order to ADC at [phone] or telephone your order directly to the ADC Parts
Department at [phone]. 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.

These instructions are only valid if the following country code is on the appliance… If this code is not present on the
appliance, it is necessary to refer to the technical instructions which will provide the necessary information concerning
the modification of the appliance to the condition of use for the country.

In accordance with EN ISO 3166-1, the names of countries shall be represented by the following codes:

GB United Kingdom
IE Ireland

“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.

2 American Dryer Corp. 113230-16

!

WARNING

Proposition 65

Use of this product could expose you to substances

from fuel combustion that contain chemicals

known to the State of California to cause cancer,

birth defects and other reproductive harm.

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 standards.

Please observe all safety precautions displayed on the
equipment and/or specified in the installation manual
included with the dryer.

CAUTION

Dryers should never be left unattended while in operation.
“Caution: Label all wires prior to disconnection when

servicing controls. Wiring errors can cause improper
operation.”

«Attention: Au moment de l’entretien des commandes,
étiquetez tous les fils avant de les débrancher. Des erreurs
de câblage peuvent entraîner un fonctionnement inadéquat
et dangereux.»

WARNING

Children should not be allowed to play on or near the
dryer(s). Children should be supervised if near dryers in
operation.

Under no circumstances should the dryer door switches,
lint drawer switch, or heat safety circuit ever be disabled.

Do not modify this appliance.
The dryer must never be operated with any of the back

guards, outer tops, or service panels removed. Personal
injury or fire could result.

The dryer must never be operated without the lint filter/
screen in place, even if an external lint collection system
is used.

If the hi-limit switch trips, a service call is required to
investigate the reason and resolve the issue.

In the State of Massachusetts, the following
installation instructions apply:

■ Installations and repairs must be performed
by a qualified or licensed contractor,
plumber, or gasfitter qualified or licensed
by the State of Massachusetts.

■ If using a ball valve, it shall be a T-handle
type.

■ A flexible gas connector, when used, must
not exceed 3 feet.

Table of Contents ______________

Safety Precautions ........................................... 4

Specifications .................................................... 5

Component Identification .................................. 7

Installation Procedures .................................... 7

Location Requirements ............................................7

Unpacking / Setting Up ............................................. 8

Dryer Enclosure Requirements ................................8

Fresh Air Supply Requirements ............................... 9

Exhaust Requirements .............................................9

Electrical Information .............................................. 12

Gas Information......................................................16

Steam Information ...................................................18

Preparation for Operation / Start-Up ......................20

Preoperational Test ................................................ 20

Preoperational Instructions ....................................21

Shutdown Instructions ........................................... 22

Service / Parts Information ............................. 22

Service...................................................................22

Parts .......................................................................22

Warranty Information ..................................... 22

Returning Warranty Cards .....................................22

Warranty ................................................................23

Returning Warranty Parts ......................................23

Routine Maintenance ...................................... 23

Cleaning ................................................................. 23

Adjustments ...........................................................24

Lubrication ............................................................. 24

Lint Drawer Removal .............................................24

Data Label Information ................................... 24

Procedure for Functional Check .................... 25

Manual Reset Burner Hi-Limit Instructions ... 26

Phase 7 ..................................................................26

Dual Timer .............................................................. 27

Fire Suppression System ............................... 27

Non-Coin Programming .................................. 30

Coin Programming .......................................... 31

FOR YOUR SAFETY

Do not dry mop heads in the dryer. Do not use dryer in
the presence of dry cleaning fumes.

The 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.

113230-16 www.adclaundry.com 3

List of Acronyms _____________________

HVAC Heating, Ventilating, and Air-Conditioning
in WC Inches of Water Column
L.C.D. Liquid Crystal Display
L.E.D. Light Emitting Diode
L.P. Liquid Propane
OSHA Occupational Safety and Health Administration
R.M.A. Return Material Authorization
UL Underwriters Laboratory

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.

The dryer must never be operated with any of the back
guards, outer tops, or service panels removed. Personal
injury or fire could result.

Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.

Do not spray aerosols in the vicinity of this appliance while
it is in operation.

Purchaser and 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.

What 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 gas supplier.

Dryers must be exhausted to the outdoors.
Although the manufacturer produces a very versatile dryer,

there are some articles that, due to fabric composition or
cleaning method, should not be dried in it.

WARNING

The collection of lint in the burner area and exhaust
ductwork can create a potential fire hazard.

For personal safety, the dryer must be electrically grounded
in accordance with local and/or country codes. In the
absence of these codes use 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.

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 should the dryer door
switches, lint drawer switch, or heat safety circuit ever
be disabled.

This dryer is not to be used in the presence of dry cleaning
solvents or fumes.

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.

Read and follow all caution and direction labels attached to
the dryer.

For safety, proper operation, and optimum performance, the
dryer must not be operated with a load less than 66%, 50 lb
(22.7 kg) of its rated capacity.

WARNING

Dry only water washed fabrics. Do not dry articles spotted
or washed in dry cleaning solvents, combustible
detergents, industrial chemicals, or “all purpose” cleaner.
Explosion could result.

Do not dry rags or articles coated or contaminated with
gasoline, kerosene, oil, paint, or wax. Explosion could
result.

Do not dry mop heads. Contamination by wax or
flammable solvents will create a fire hazard.

Do not use heat for drying articles that contain plastic,
foam, sponge rubber, or similarly textured rubber
materials. Drying in a heated tumbler may damage
plastics or rubber and also may be a fire hazard.

The possible presence of residual quantities of aggressive
or decomposed chemicals in the load may produce damage
to the machine and harmful fumes.

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.

4 American Dryer Corp. 113230-16

You must discontinue 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 standards.

IMPORTANT: The 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).

CE ONLY

IMPORTANT: This appliance must only be installed and
operated in the country of destination indicated on the
dryer’s data plate. If the appliance is to be installed and
operated in a country other than the one indicated on the
data plate, a data plate amendment must be obtained
from American Dryer Corporation.

IEC335 applies.

WARNING

Specifications _____________________________________________________________________

MAXIMUM CAPACITY (DRY WEIGHT) 75 lb

TUMBLER DIAMETER 36-1/4”
TUMBLER DEPTH 36”
TUMBLER VOLUME 21.50 cu ft

TUMBLER (DRIVE) MOTOR Non-Reversing / Reversing 1 hp / 1/2 hp*
BLOWER (FAN) MOTOR Non-Reversing / Reversing — / 1 hp*
DOOR OPENING (DIAMETER) 31-3/8”
DOOR SILL HEIGHT 28”
WATER CONNECTION 3/4”-11.5 NH (North America)

3/4” B.S.P.T. (Outside North America)
DRYERS PER 20’/40’ CONTAINER 10 / 20
DRYERS PER 48’/53’ TRUCK 24 / 26

VOLTAGE AVAILABLE 120-575V 1,3ø 2,3,4w 50/60 Hz
APPROXIMATE NET WEIGHT 721 lb
APPROXIMATE SHIPPING WEIGHT 773 lb

kcal/hr
25,800

60 Hz
50 Hz

60 Hz
50 Hz

60 Hz
50 Hz

1,000 cfm

833 cfm

3/4” B.S.P.T. (CE and Australia Only)

1,000 cfm

833 cfm

1,200 cfm
1,000 cfm

AIRFLOW

HEAT INPUT 175,000 Btu/hr

GASELECTRICSTEAM

EXHAUST CONNECTION (DIAMETER) 8”
COMPRESSED AIR CONNECTION N / A
COMPRESSED AIR VOLUME N / A
INLET PIPE CONNECTION 3/4” F.N.P.T.

VOLTAGE AVAILABLE 208-575V 3ø 3,4w 50/60 Hz
APPROXIMATE NET WEIGHT 721 lb
APPROXIMATE SHIPPING WEIGHT 773 lb
AIRFLOW

EXHAUST CONNECTION (DIAMETER) 8”
COMPRESSED AIR CONNECTION N / A
COMPRESSED AIR VOLUME N / A

OVEN SIZE

kW Btu/hr

30 102,400
VOLTAGE AVAILABLE 120-575V 1,3ø 2,3,4w 50/60 Hz
APPROXIMATE NET WEIGHT 816 lb
APPROXIMATE SHIPPING WEIGHT 868 lb
AIRFLOW

STEAM CONSUMPTION 275 lb/hr
OPERATING STEAM PRESSURE 125 psi max
EXHAUST CONNECTION (DIAMETER) 8”
COMPRESSED AIR CONNECTION 1/8” F.N.P.T.
COMPRESSED AIR VOLUME 0.75 cfh
BOILER HORSEPOWER (NORMAL LOAD) 7.2 Bhp
SUPPLY CONNECTIONS (2) 1-1/4” M.N.P.T.
RETURN CONNECTIONS (2) 1” M.N.P.T.

Shaded areas are stated in metric equivalents 2/19/09

* Reversing dryers use 3-phase (3ø) motors.

34.02 kg

92.08 cm

91.44 cm

608.81 L

0.75 kW / 0.37 kW
— / 0.75 kW

79.69 cm

71.12 cm

327.04 kg

350.63 kg

28.32 cmm

23.60 cmm

44,099 kcal/hr

20.32 cm

327.04 kg

350.63 kg

28.32 cmm

23.60 cmm

20.32 cm

370.13 kg

393.72 kg

33.98 cmm

28.32 cmm

124.7 kg/hr

8.62 bar

20.32 cm

0.02 cmh

NOTE: The manufacturer reserves the right to make changes in specifications at any time without notice or obligation.

113230-16 www.adclaundry.com 5

Specifications _____________________________________________________________________

6 American Dryer Corp. 113230-16

Component Identification ____________

Dryer Front View

Illus. No. Description

1 Controls
2 Control (top access) Door Assembly
3 Main Door Assembly
4 Lint Compartment Area

(lint screen located behind lint door or left sidewall)

Dryer Rear View

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. 70­LATEST 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 (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).

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 (L.P. Gas) or LATEST EDITION (for General
Installation and Gas Plumbing).

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.”

The dryer must not be installed or stored in an area where it
will be exposed to water and/or weather.

The dryer is for use in noncombustible locations.
Provisions for adequate air supply must be provided as

noted in this manual (refer to Fresh Air Supply Requirements
section).

Clearance provisions must be made from combustible
construction as noted in this manual (refer to Dryer
Enclosure Requirements section).

Provisions must be made for adequate clearances for
servicing and for operation as noted in this manual (refer to
Dryer Enclosure Requirements section).

The dryer must be installed with a proper exhaust duct
connection to the outside as noted in this manual (refer to
Exhaust Requirements section).

The dryer must be located in an area where correct exhaust
venting can be achieved as noted in this manual (refer to
Exhaust Requirements section).

IMPORTANT: The dryer should be located where a
minimum amount of exhaust ducting will be necessary.

The dryer must be installed with adequate clearance for air
openings into the combustion chamber.

Illus. No. Description

1 Heating Unit
2 Electric Service Relay Box
3 Tumbler Bearing Mount Assembly
4 Idler Bearing Mount Assembly
5 Blower Motor Assembly (for reversing models only)
6 Leveling Legs (rear)
7 Tumbler (drive) Motor Assembly
8 Dryer Exhaust
9 Data Label and Installation Label

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: The 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).

113230-16 www.adclaundry.com 7

Unpacking / Setting Up _______________

Remove protective shipping material (i.e., plastic wrap and
optional shipping box) from the 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 unskid the
dryer, locate and remove the four bolts securing the base of
the dryer to the wooden skid. Two are at the rear base
(remove the back panel for access), and two are located in
the bottom of the lint chamber. To remove the two bolts
located in the lint chamber area, remove the lint door.

To increase bearing life and improve efficiency, the dryer
should be tilted slightly to the rear.

The lint coops of this dryer are supported during shipping
by a bracket. Remove this bracket before starting the dryer.

Leveling Dryer

The dryer is equipped with four
leveling legs, one at each corner of
the base. Two are located at the
rear of the dryer base, and two are
located in the lint chamber (coop).
To increase bearing life and
improve efficiency, the dryer should
be tilted slightly to the rear.

Dryer Enclosure Requirements _______

Bulkheads and partitions should be made of
noncombustible materials and must be located a minimum
of 12-inches (30.48 cm) (18-inches [45.72 cm] or more is
recommended for ease of installation, maintenance, and
service) above the dryer’s 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 4-inches (10.16 cm) and must not extend
more than 4-inches (10.16 cm) to the rear of the front. The
bulkhead facing must not be closed in all the way to the top
of the dryer. A 1-inch (2.54 cm) clearance is required.

NOTE: Allowances must be made for opening the control
door.

Dryers may be positioned sidewall to sidewall. However, a
1/16” (1.5875 mm) minimum allowance must be made for
the opening and closing of the control door and the lint 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 below for details.

NOTE: Air considerations are important for proper and
efficient operation.

IMPORTANT: Even though a minimum of only 12-inches
(30.48 cm) is required, 18-inches (45.72 cm) or more is
suggested. The additional clearance is advantageous for
ease of installation and service.

8 American Dryer Corp. 113230-16

IMPORTANT: 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, a 1/16”
(1.5875 mm) minimum allowance is required between
dryers (or wall) for ease of installation and maintenance.
Allowances must be made for the opening and closing of
the control door and the lint door.

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.

Fresh Air Supply Requirements ______

This appliance may only be installed in a room that meets
the appropriate ventilation requirements specified in the
national installation regulations.

When the dryer is operating, it draws in room air, heats it,
passes this air through the 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 ensure proper performance of each dryer. An unrestricted
source of air is necessary for each dryer. An airflow of 1,000
cfm (cubic feet per minute), (28.3 cmm [cubic meters per
minute]) must be supplied to 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. The dryer must be installed with
provisions for adequate combustion and make-up air supply.

NOTE: Component failure due to dry cleaning solvent
fumes will void the warranty.

Exhaust Requirements _______________

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 hi-heat thermostats. The dryer must be
installed with a proper exhaust duct connection to the
outside.

The design of the flue system shall be such that any
condensate formed when operating the appliance from cold
shall either be retained and subsequently re-evaporated or
discharged.

CAUTION: This dryer produces combustible lint and must
be exhausted to the outdoors.

Improperly sized or installed exhaust ductwork can create
a potential fire hazard.

IMPORTANT: It is recommended that exhaust or booster
fans not be used in the exhaust ductwork system.

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. 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 dryers, two unrestricted
openings measuring 2 feet by 1-1/2 feet (0.61 meters by

0.46 meters), (6 square feet [0.56 square meters]) are
acceptable.

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.

Horizontal Venting

When single dryer venting is used, the length of ductwork
from the dryer to the outside exhaust outlet must not exceed
25 feet (7.62 meters). The minimum diameter of this
ductwork must be at least 8-inches (20.32 cm). In the case
of multiple (common) dryer venting, the distance from the
last dryer to the outside exhaust outlet must 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 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
tumbler/dryer elbow connections or elbows used for outside
protection from the weather, no more than two elbows should
be used in the exhaust duct run. If more than two elbows
are used, the cross-sectional area of the ductwork must be
increased. 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.

113230-16 www.adclaundry.com 9

Vertical Venting

When single dryer venting is used, the length of the ductwork
from the dryer to the outside exhaust outlet must not exceed
15 feet (4.57 meters). The minimum diameter of this
ductwork must be at least 8-inches (20.32 cm). In the case
of multiple (common) dryer venting, the distance from the
last dryer to the outside exhaust outlet must not exceed 15
feet (4.57 meters). The shape of the ductwork is not so
critical as 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° bends instead. The radius of the elbows
should preferably be 1-1/2 times the diameter of the duct.
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 0.7 in WC (1.74 mb).

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.

As per the National Fuel Gas Code, “Exhaust ducts for
type 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 [0.50 mm]) thick.”

Outside Ductwork Protection

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.

Single Dryer Venting

When possible, it is suggested to provide a separate exhaust
duct for each dryer. The exhaust duct 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. 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: Exhaust back pressure measured by a
manometer in the exhaust duct must be no less than 0
and must not exceed 0.7 in WC (1.74 mb).

For extended ductwork runs, the cross section area of the
ductwork can only be increased to an extent. When the
ductwork approaches the maximum limits noted in this
manual, a professional 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.

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.

Outside Ductwork Protection

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.

IMPORTANT: Do not use screens, louvers, or caps on the
outside opening of the exhaust ductwork.

IMPORTANT: Do not use screens, louvers, or caps on the
outside opening of the exhaust ductwork.

10 American Dryer Corp. 113230-16