American Dryer Corp. ML-170 User Manual
ML-170 Installation Manual
Phase 7 / Non-Coin / Fire Suppression System
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.
— WHA T T O 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 .
A VERTISSEMENT : 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
T elephone: +1 (508) 678-9000 / Fax: +1 (508) 678-9447
e-mail: techsupport@amdry .com
www.amdry.com
ADC Part No. 113360- 8
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 ______________________________________________________________________________________
ML-170 PH7
Serial Number(s) ________________________________________________________________________________________
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
Replacement parts can be obtained from your reseller or the ADC factory. When ordering replacement part s
from the factory , you can FAX your order to ADC at +1 (508) 678-9447 or telephone your order directly to the
ADC Parts Department at +1 (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 NO TE T O 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 .
!
▲ WARNING
Table of Contents
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
Y ou 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 Occupational Safety
and Health Administration (OSHA) standards.
Please observe all safety precautions displayed on
the equipment and/or specified in the installation
manual included with the dryer.
CAUTION
The dryer(s) 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
dryer(s) in operation.
Under no circumstances should the dryer door
switch(es), lint door/drawer switch(es), or heat safety
circuit(s) ever be disabled.
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.
FOR Y OUR 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
and/or weather.
The wiring diagram for the dryer is located in the
front electrical control box area.
SECTION I
SAFETY PRECAUTIONS........................4
SECTION II
SPECIFICATIONS ..................................6
SECTION III
INSTALLATION PROCEDURES .............8
A. Location Requirements ................................... 8
B. Unpacking/Setting Up ..................................... 9
C. Dryer Enclosure Requirements ......................11
D. Fresh Air Supply Requirement s..................... 12
E. Exhaust Requirements.................................. 13
F . Electrical Information..................................... 17
G . Gas Information............................................. 20
H. Steam Information ......................................... 23
I. Water Information.......................................... 27
J. Preparation for Operation/Start-Up................. 29
K. Preoperational Test ....................................... 30
L. Preoperational Instructions ........................... 32
M. Compressed Air Requirements...................... 32
N. Shutdown Instructions................................... 33
SECTION IV
SERVICE/PARTS INFORMATION ........34
A. Service .......................................................... 34
B. Parts ............................................................. 34
SECTION V
WARRANTY INFORMATION................35
A. Returning Warranty Cards ............................. 35
B. Warranty ....................................................... 35
C. Returning Warranty Parts.............................. 35
SECTION VI
ROUTINE MAINTENANCE ..................37
A. Cleaning ........................................................ 37
B. Adjustments ................................................. 39
C. Lubrication .................................................... 39
SECTION VII
MANUAL RESET BURNER HI-LIMIT
INSTRUCTIONS ...................................40
A. Phase 7 ........................................................ 40
B. Dual Timer .................................................... 40
SECTION VIII
DATA LABEL INFORMATION ...............41
SECTION IX
PROCEDURE FOR FUNCTIONAL
CHECK OF REPLACEMENT
COMPONENTS .....................................42
SECTION I
SAFETY PRECAUTIONS
WARNING: For your safety , the information in this manual must be followed to minimize the risk of fire or
explosion or to prevent property damage, personal injury , or loss of life.
WARNING: The dryer must never be operated with any of the back guards, outer tops, or service
panels removed. PERSONAL INJURY OR FIRE COULD RESUL T .
1. DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
2. Purchaser/user should consult the local gas supplier for proper instructions to be followed in the event the user
smells gas. The instructions should be posted in a prominent location.
3. WHAT TO DO IF YOU SMELL GAS:
a. DO NOT try to light any appliance.
b. DO NOT touch any electrical switch.
c. DO NOT use any phone in your building.
d. Clear the room, building, or area of 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. The 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 RESUL T .
WARNING: DO NOT dry rags or articles coated or contaminated with gasoline, kerosene, oil, paint, or wax.
EXPLOSION COULD RESUL T .
WARNING: DO NOT dry mop heads. Contamination by wax or flammable solvents will create a fire
hazard.
4 American Dryer Corp. 113360-8
WARNING: DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or similarly
textured rubberlike materials. Drying in a heated tumbler may damage plastics or rubber and
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 switches, the lint drawer switch, or the heat safety
circuit ever be disabled.
W ARNING: PERSONAL INJUR Y OR FIRE COULD RESULT .
10. This dryer is not to be used in the presence of dry cleaning solvents or fumes.
11. Remove articles from the dryer as soon as the drying cycle has been completed.
WARNING: Articles left in the dryer after the drying and cooling cycles have been completed can create a fire
hazard.
12. DO NOT operate steam dryers with more than 125 psi (8.62 bar) steam pressure. Excessive steam pressure can
damage the steam coil and/or harm personnel.
13. Replace leaking flexible steam hoses or other fixtures immediately. DO NOT operate the dryer with leaking
flexible hoses. PERSONAL INJURY MAY RESULT.
14. READ AND FOLLOW ALL CAUTION AND DIRECTION LABELS ATTACHED TO THE DRYER.
15. For safety, proper operation, and optimum performance, the dryer must not be operated with a load less than
sixty-six percent (66%), 112 lb (51 kg) of its rated capacity.
W ARNING: YOU MUST DISCONNECT AND LOCKOUT THE ELECTRIC SUPPL Y AND THE
GAS SUPPL Y OR THE STEAM SUPPL Y BEFORE ANY COVERS OR GUARDS
ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING ,
ADJUSTING , INST ALLA TION, OR TESTING OF ANY EQUIPMENT PER
OCCUP A TIONAL SAFETY AND HEALTH ADMINISTRA TION (OSHA)
STANDARDS.
IMPORT ANT : 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).
113360-8 www.amdry.com 5
SECTION II
SPECIFICATIONS
MAXIMUM CAPACITY (DRY WEIGHT) 17 0 lb
TUMBLER DIAMETER 51 - 1/2 ”
TUMBLER DEPTH 42-1/2”
TUMBLER VOLUME 51.20 cu ft
TUMBLER/D RIVE MOTOR 1 h p
BLOWER/FAN MOTOR 7-1/2 hp
DOOR OP E NING (DIAMETER) 3 1-3/8”
DOOR S ILL HEIGHT 3 3-3/ 8”
WATER CONNECTION 3/4”-11.5 NH
3/4” B.S.P.T.
DRYERS PER 20 ’/4 0’ CONTAINER 3 / 7
DRYERS PER 48 ’/5 3’ TRUCK 8 / 9
VOLTAGE AVAILABLE 208-575V 3ø 3,4w 50/60 Hz
APPROXIMATE NET WEIGHT 2,103 lb
APPROXIMATE SHIPPING WEIGHT 2,26 9 lb
AIRFLOW 60 Hz 3,700 cfm
50 Hz 3,083 cfm
HEAT INPUT 550,000 Btu/hr
EXHAUST CONNECTION (DIAMETER) 18”
GasElectricSteam
COMPRE SSED A IR CONNECTION 1/4” Quick Connection
COMPRE SSED A IR VOLUME 4.2 5 cfh
INLET PIPE CONNECTION 1-1/2” F.N. P.T.
1-1/2” B.S.P.T.
VOLTAGE AVAILABLE 416-460V 3ø 3,4w 50/60 Hz
APPROXIMATE NET WEIGHT 2,103 lb
APPROXIMATE SHIPPING WEIGHT 2,26 9 lb
AIRFLOW 60 Hz 3,700 cfm
50 Hz 3,083 cfm
EXHAUST CONNECTION (DIAMETER) 18”
COMPRE SSED A IR CONNECTION 1/4” Quick Connection
COMPRE SSED A IR VOLUME 4.2 5 cfh
OVEN SIZE
kW Btu/hr
126 429,900
VOLTAGE AVAILABLE 208-575V 3ø 3,4w 50/60 Hz
APPROXIMATE NET WEIGHT 2,25 9 lb
APPROXIMATE SHIPPING WEIGHT 2,425 lb
AIRFLOW 60 Hz 4,400 cfm
STEAM CONSUMPTION 725 lb/hr
OPERATING STEAM PRESSURE 125 psi ma x
EXHAUST CONNECTION (DIAMETER) 20”
COMPRE SSED A IR CONNECTION 1/4” Quick Connection
COMPRE SSED A IR VOLUME 4.2 5 cfh
BOILER HORSEPOWER (NORMAL LOAD) 19 Bhp
SUPPLY CONNECTION 1-1/2” F.N. P.T.
RETURN CONNECTION 1-1/2” F.N.P.T.
Shaded areas are stated in metric equivalents 5/31/06
kcal/hr
108,300
50 Hz 3,666 cfm
(Outside North America)
77.11 kg
130.81 cm
107.95 cm
1,449.82 L
0.75 kW
5.59 kW
79.69 cm
84.77 cm
(North America)
953.90 kg
1,029.20 kg
104.77 cmm
87.30 cmm
138,598 kcal/hr
45.72 cm
0.12 cmh
(CE and Australia Only)
953.90 kg
1,029.20 kg
104.77 cmm
87.30 cmm
45.72 cm
0.12 cmh
1,024.67 kg
1,099.96 kg
124.59 cmm
103.80 cmm
328.85 kg/hr
8.62 bar
50.80 cm
0.12 cmh
IMPORTANT: Gas dryers and steam dryers must be provided with a clean, dry, and regulated 80 psi ± 10
psi (5.51 bar ± 0.68 bar) air supply .
NOTE: ADC reserves the right to make changes in specifications at any time without notice or obligation.
6 American Dryer Corp. 113360-8
Specifications
NOTE: ADC reserves the right to make changes in specifications at any time without notice or obligation.
113360-8 www.amdry.com 7
SECTION III
INSTALLATION PROCEDURES
Installation should be performed by competent technicians in accordance with local and state codes. In the absence of
these codes, the installation must conform to applicable American National S tandards: ANSI Z223.1-LATEST 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/CGAB149.2-M91 (Liquid Propane [L.P .] Gas) or LATEST EDITION (for General Installation and Gas Plumbing) or Canadian
Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION (for Electrical Connections).
A. LOCATION REQUIREMENTS
Before installing the dryer, be sure the location conforms to local codes and ordinances. In the absence of such codes or
ordinances the location must conform with the National Fuel Gas Code ANSI.Z223.1 LATEST EDITION, or in Canada,
the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1-M91 (Natural Gas) or CAN/
CGA-B149.2-M91 (L.P. Gas) or LATEST EDITION (for General Installation and Gas Plumbing).
1. The dryer must be installed on a sound level floor capable of supporting its weight. Carpeting must be removed
from the floor area that the dryer is to rest on.
IMPORTANT: “The dryer must be installed on noncombustible floors only.”
2. The dryer must not be installed or stored in an area where it will be exposed to water and/or weather.
3. The dryer is for use in noncombustible locations.
4. Provisions for adequate air supply must be provided as noted in this manual (refer to Fresh Air 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. The dryer must be installed with a proper exhaust duct connection to the outside as noted in this manual (refer to
Exhaust Requirements in Section E).
8. The 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: The dryer should be located where a minimum amount of exhaust duct will be necessary .
9. The dryer must be installed with adequate clearance for air openings into the combustion chamber.
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.
8 American Dryer Corp. 113360-8
IMPORT ANT : 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).
B. UNPACKING/SETTING UP
Remove protective shipping material (i.e., plastic wrap and/or optional shipping box) from dryer.
IMPORTANT: The dryer must be transported and handled in an upright position at ALL times.
The dryer can be moved to its final location while still attached to the skid or with the skid removed. T o remove the skid
from the dryer, locate and remove the four (4) lag bolts securing the base of the dryer to the wooden skid. Two (2) are
at the rear base, and two (2) are located in the bottom of the lint chamber. To remove the two (2) lag bolts located in the
lint chamber area, remove the lint drawer and the three (3) Phillips head screws securing the lint door in place.
1.
Leveling Dryer
a. To level the dryer , place 4-inch (10.16 cm) square metal shims or other suitable material under the base pads. It
is suggested that the dryer be tilted slightly to the rear (refer to the illustration above).
b. The V -belts are disconnected from the tumbler drive motor for shipping. Reconnect V-belts before starting the
dryer.
113360-8 www.amdry.com 9
2. If more headroom is needed when moving the dryer into position, the top console (module) may be removed.
a. T o Remove Top Console (module)...
1) Disconnect the ground wire (A in the illustration below) located at the rear upper left corner of the dryer.
2) Remove the eight (8) sets of nuts and washers (B in the illustration below) holding the console (module)
to the base.
3) Disconnect the white plug connector (C in the illustration below) located on the top of the rear electric
service/relay box (provides power to the heat circuit).
4) Disconnect air connection from the 3-way micro valve.
5) Lift the console (module) off of the dryer base.
IMPORTANT: The dryer must be transported and handled in an upright position at ALL times.
10 American Dryer Corp. 113360-8
C. DRYER ENCLOSURE REQUIREMENTS
Bulkheads and partitions should be made of noncombustible material.
NOTE: Allowances must be made for opening the control door .
A 40-inches (101.6 cm) for optimum opening of load door.
B The maximum thickness of the bulkhead is 4-inches (10.16 cm).
C For gas and electric dryers a minimum overhead clearance of 12-inches (30.48 cm) is required, providing no
sprinkler is located above the dryer. For steam dryers or if a sprinkler is located above the dryer, 18-inches (45.72
cm) is required.
D The dryer should be positioned 24-inches (60.96 cm) away from the nearest obstruction and 36-inches (91.44 cm)
is recommended for ease of installation, maintenance, and service.
E 2-inch (5.08 cm) minimum is required for opening the control door.
F Flooring should be level or below dryer cabinet for ease of removing panels during maintenance.
G The 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, along with the removal of panels during maintenance.
113360-8 www.amdry.com 11
D. FRESH AIR SUPPLY REQUIREMENTS
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
result, as well as premature motor failure from overheating. The dryer must be installed with provisions for adequate
combustion and make-up air supply.
Air supply (make-up air) must be given careful consideration to ensure proper performance of each dryer. An unrestricted
source of air is necessary for each dryer. As a general rule, an unrestricted air entrance from the outdoors (atmosphere)
of a minimum of 4 square feet (0.37 square meters) is required for each dryer. (Based on 1 square inch per 1,000 Btu.)
To compensate for the use of registers or louvers used over the openings, this make-up air must be increased by
approximately thirty-three percent (33%). Make-up air openings should not be located in an area directly near where
exhaust vents exit the building.
is not necessary to have a separate make-up air opening for each dryer . Common make-up air openings are acceptable.
It
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 six (6) dryers, two (2) unrestricted openings measuring 3 feet by 4 feet (0.91 meters by 1.22
meters) are acceptable.
will be adversely affected. Ignition problems and sail switch “fluttering” problems may
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.
12 American Dryer Corp. 113360-8
E. EXHAUST REQUIREMENTS
1. General Exhaust Ductwork Information
Exhaust ductwork should be designed and installed by a qualified professional. Improperly sized ductwork will
create excessive back pressure, which results in slow drying, increased use of energy , overheating of the dryer , and
shutdown of the burner by the airflow (sail) switches, burner hi-limits, or tumbler hi-heat thermostats. The dryer
must be installed with a proper exhaust duct connection to the outside.
CAUTION: This dryer produces combustible lint and must be exhausted to the outdoors.
CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUST DUCTWORK CAN CREATE A
POTENTIAL FIRE HAZARD.
NOTE: When dryers are exhausted into a multiple (common) exhaust line, each dryer must be supplied with a
back draft damper.
The ductwork should be laid out in such a way that the ductwork travels as directly as possible to the outdoors with
as few turns as possible. Single or independent dryer venting is recommended.
When single dryer venting is used, the ductwork from the dryer to the outside exhaust outlet should not exceed 20
feet (6.09 meters). In the case of multiple (common) dryer venting, the distance from the last dryer to the outside
exhaust outlet should not exceed 20 feet (6.09 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 90º turns be avoided; use 30º and/or 45º
bends/angles instead. The radius of the elbows should preferably be 1-1/2 times the diameter of the duct.
ALL ductwork should be smooth inside with no projections from sheet metal screws or other obstructions, which
will collect lint. When adding ducts, the duct to be added should overlap the duct to which it is to be connected.
ALL ductwork joints must be taped to prevent moisture and lint from escaping into the building. Inspection doors
should be installed at strategic points in the exhaust ductwork for periodic inspection and cleaning of lint from the
ductwork.
IMPORTANT: Exhaust back pressure measured by a manometer in the exhaust duct must be no less than 0
and must not exceed 0.3 inches (0.74 mb) of water column (W.C.).
NOTE: When the exhaust ductwork passes through a wall, ceiling, or roof made of combustible materials, the
opening must be 2-inches (5.08 cm) larger than the duct (all the way around). The duct must be
centered within this opening.
NOTE: As per the National Fuel Gas Code, “Exhaust ducts for T ype 2 clothes dryers shall be constructed of
sheet metal or other noncombustible material. Such ducts shall be equivalent in strength and corrosion
resistance to ducts made of galvanized sheet steel not less than 26 gauge (0.0195-inches [0.5 mm])
thick.”
IMPORTANT: It is recommended that exhaust or booster fans not be used in the exhaust ductwork system.
113360-8 www.amdry.com 13
a. Outside Ductwork Protection
1) T o 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.
2. Single Dryer Venting
Where 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 at each tumbler exhaust duct area must be
no less than 0 and must not exceed 0.3 inches (0.74 mb) of water column (W .C.).
Horizontal
The minimum diameter of the exhaust is 18-inches (45.72 cm) for gas dryers and 20-inches (50.8 cm) for steam
dryers (Dimension B). If the ductwork exceeds 20 feet (6.09 meters) (Dimension A) or has more than one (1)
elbow, the cross-sectional area of the ductwork must be increased in proportion to the length and number of
elbows in it. (Refer to the illustration on the next page.)
Vertical
The minimum diameter of the exhaust must be 20-inches (50.8 cm) (Dimension D). If the ductwork exceeds 20
feet (6.09 meters) (Dimension C) or has more than three (3) elbows, the cross-sectional area of the ductwork
must be increased in proportion to the length and number of elbows in it. (Refer to the illustration on the next
page.)
14 American Dryer Corp. 113360-8
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