American Dryer Corp. ML-75V User Manual
ML-75V
Gas/Electric/Steam (Phase 7 OPL/FSS)
Installation Manual
W ARNING: For your safety the information in
this manual must be followed to minimize the
risk of fire or explosion or to prevent property
damage, personal injury or death.
— Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
— WHA T TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Clear the room, building or area of all
occupants.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call
the fire department.
— Installation and service must be performed by a
qualified installer, service agency or the gas
supplier.
AVERTISSEMENT: Assurez-vous de bien
suivre les instructions données dans cette notice
pour réduire au minimum le risque d’incendie
ou d’explosion ou pour éviter tout dommage
matériel, toute blessure ou la mort.
— Ne pas entreposer ni utiliser d’essence ni
d’autres vapeurs ou liquides inflammables à
proximité de cet appareil ou de tout autre
appareil.
— QUE F AIRE SI VOUS SENTEZ UNE ODEUR
DE GAZ:
• Ne pas tenter d’allumer d’appareils.
• Ne touchez à aucun interrupteur . Ne pas
vous servir des téléphones se trouvant dans
le bâtiment.
• Évacuez la pièce, le bâtiment ou la zone.
• Appelez immédiatement votre fournisseur
de gaz depuis un voisin. Suivez les
instructions du fournisseur .
• Si vous ne pouvez rejoindre le fournisseur
de gaz, appelez le service des incendies.
— L ’installation et l’entretien doivent être assurés par
un installateur ou un service d’entretien qualifié
ou par le fournisseur de gaz.
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
071802JEV/mcronan ADC Part No. 113378
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 and
liquids in the vicinity of this or
any other appliance.
W e have tried to make this manual as complete as possible and hope you will find it useful. ADC reserves the right to make
changes from time to time, without notice or obligation, in prices, specifications, colors, and material, and to change or
discontinue models. The illustrations included in this manual may not depict your particular dryer exactly.
POUR VOTRE SÉCURITÉ
Ne pas entreposer ni utiliser d’essence
ni d’autres vapeurs ou liquides
inflammables à proximité de cet
appareil ou de tout autre appareil.
Important
For your convenience, log the following information:
DA TE OF PURCHASE________________________________ MODEL NO. __________________________________________
RESELLER’S NAME ________________________________________________________________________________________
Serial Number(s) ________________________________________________________________________________________
ML-75V
________________________________________________________________________________________
________________________________________________________________________________________
Replacement parts can be obtained from your reseller or the ADC factory . When ordering replacement parts from the factory ,
you can F AX your order to ADC at (508) 678-9447 or telephone your order directly to the ADC Parts Department at (508)
678-9000. Please specify the dryer model number and serial number in addition to the description and part number, so that
your order is processed accurately and promptly.
“IMPORT ANT NOTE TO PURCHASER”
Information must be obtained from your local gas supplier on the instructions
to be followed if the user smells gas. These instructions must be posted in a
prominent location near the dryer .
IMPORTANT
YOU MUST DISCONNECT AND LOCKOUT THE ELECTRIC SUPPL Y AND THE GAS
SUPPLY OR THE STEAM SUPPLY BEFORE ANY COVERS OR GUARDS ARE
REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING,
ADJUSTING, INSTALLATION, OR TESTING OF ANY EQUIPMENT PER OSHA
(Occupational Safety and Health Administration) STANDARDS.
«Attention: Au moment de l’entretien des
“Caution: Label all wires prior to
disconnection when servicing controls. W iring
errors can cause improper operation.”
commandes, étiquetez tous les fils avant de
les débrancher. Des erreurs de câblage
peuvent entraîner un fonctionnement
inadéquat et dangereux.»
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 DRYER(S).
CHILDREN
SHOULD BE SUPER VISED IF NEAR DRYERS 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 CIRCUMST ANCES should the dryer door switches, lint drawer switch or
the heat safety circuit ever be disabled.
WARNING
The dryer must never be operated with any of the back guards, outer tops, or service
panels removed. PERSONAL INJURY OR FIRE COULD RESUL T .
WARNING
DRYER MUST NEVER BE OPERA TED WITHOUT THE LINT FIL TER/SCREEN IN
PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED.
IMPORTANT
PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment and/or
specified in the installation manual included with the dryer.
Dryer must not be installed or stored in an area where it
The wiring diagram for the dryer is located in the front electrical control box area.
will be exposed to water or weather .
IMPORTANT
Dryer must be installed in a location/environment, which the ambient temperature
remains between 40° F (4.44° C) and 130° F (54.44° C).
Table of Contents
SECTION I
IMPORTANT INFORMATION ............................................................................... 3
A. Receiving and Handling ............................................................................................................... 3
B. Safety Precautions ...................................................................................................................... 4
SECTION II
SPECIFICATIONS/COMPONENT IDENTIFICATION .....................................6
A. Specifications ............................................................................................................................. 6
B. Component Identification ............................................................................................................ 8
SECTION III
INSTALLATION PROCEDURES ......................................................................... 10
A. Location Requirements ............................................................................................................. 10
B. Unpacking/Setting Up ............................................................................................................... 11
C. Dryer Enclosure Requirements .................................................................................................. 12
D. Fresh Air Supply Requirements ................................................................................................. 13
E. Exhaust Requirements ............................................................................................................... 14
F. Electrical Information ................................................................................................................ 19
G . Gas Information ........................................................................................................................ 27
H. Steam Information .................................................................................................................... 31
I. Preparation For Operation/Start-Up ......................................................................................... 35
J. Preoperational T ests ................................................................................................................. 36
K. Preoperational Instructions ........................................................................................................ 38
L. Shutdown Instructions............................................................................................................... 39
SECTION IV
SERVICE/PARTS INFORMATION ......................................................................40
A. Service ..................................................................................................................................... 40
B. Parts ........................................................................................................................................ 40
SECTION V
WARRANTY INFORMATION ............................................................................... 41
A. Returning W arranty Cards......................................................................................................... 41
B. Warranty .................................................................................................................................. 41
C. Returning Warranty Parts .......................................................................................................... 41
SECTION VI
ROUTINE MAINTENANCE .................................................................................. 4 3
A. Cleaning ................................................................................................................................... 43
B. Adjustments ............................................................................................................................. 44
C. Lubrication ............................................................................................................................... 45
SECTION VII
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT
COMPONENTS........................................................................................................46
SECTION VIII
REVERSING TIMER SPIN/DWELL ADJUSTMENTS ..................................... 48
SECTION IX
DATA LABEL INFORMATION .............................................................................4 9
A. Data Label ............................................................................................................................... 49
SECTION X
FIRE SUPPRESSION SYSTEM (FSS) ................................................................. 51
Installation ...................................................................................................................................... 52
Fire Suppression System (FSS) Theory of Operation ...................................................................... 55
System Reset.................................................................................................................................. 55
OPL FSS Check Procedure ........................................................................................................... 55
Fire Suppression System (FSS) Parts Break Down ......................................................................... 56
SECTION I
IMPORTANT INFORMA TION
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/or 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 basket (tumbler) section of the dryer must be transported and handled in an
upright position at ALL times.
3
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 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. 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.
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 may be a fire hazard.
4
7. A program should be established for the inspection and cleaning of lint in the heating unit area, exhaust
ductwork, and inside 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, lint drawer switch, or the heat safety
circuit ever be disabled.
W ARNING: PERSONAL INJURY OR FIRE COULD RESUL T .
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 steam coil and/or harm personnel.
13. Replace leaking flexible hoses or other steam fixtures immediately. DO NOT operate the dryer with
leaking flexible hoses. PERSONAL INJURY MAY RESULT.
14. The normal PH level for copper type steam coils must be maintained between a value of 8.5 to 9.5. For
steel type steam coils the PH level must be maintained between a value of 9.5 to 10.5. These limits are set
to limit the acid attack of the steam coils.
IMPORTANT : Coil failure due to improper PH level will VOID THE WARRANTY.
15. READ AND FOLLOW ALL CAUTION AND DIRECTION LABELS ATTACHED TO THE
DRYER.
16. For safety, proper operation, and optimum performance, the dryer must not be operated with a load less
than sixty-six percent (66%), 50 lbs (22.67 kg) of its rated capacity .
W ARNING: YOU MUST DISCONNECT AND LOCKOUT THE ELECTRIC SUPPLY AND
THE GAS SUPPL Y OR THE STEAM SUPPL Y BEFORE ANY COVERS or
GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS
FOR CLEANING , ADJUSTING, INSTALLA TION, OR TESTING OF ANY
EQUIPMENT PER OSHA (Occupational Safety and Health Administration)
STANDARDS.
IMPORTANT: Dryer must be installed in a location/environment, which the ambient
temperature remains between 40º F (4.44º C) and 130º F (54.44º C).
5
SECTION II
SPECIFICATIONS/COMPONENT IDENTIFICATION
A. SPECIFICATIONS
BAS K ET (TUM BL ER) D IAM ETER 37 ” 94 cm
BAS K ET (TUM BL ER) D EP TH 36 ”
BAS K ET (TUM BL ER) M OTO R 1 H P *
DO OR O P E N I N G (D IAM ETER ) 31 -3 /8 ”
BAS K ET (TUM BL ER) V O LUM E 22 . 4 c u. ft.
DRYERS PER 20’/40’ CONTAINER 10/20
DRYERS PER 45’/48’ TRUCK 24/24
AIRFLO W 90 0 c fm
VOLTAGE AVAILABLE 120-460v 1ø-3ø 50/60 Hz
APPRO X. WEIGHT (UNCRATED) 721 lbs
APPRO X. WEIGHT (CRATED) 771 lbs
Gas
HEAT INPUT 200,000 btu/hr
INLET PIPE SIZE 3/4” N.P.T.**
VOLTAGE AVAILABLE 208-460v 1ø- 3ø 50/60 Hz
APPRO X. WEIGHT (UNCRATED) 721 lbs
APPRO X. WEIGHT (CRATED) 771 lbs
Electric
VOLTAGE AVAILABLE 120-460v 1ø-3ø 50/60 Hz
APPRO X. WEIGHT (UNCRATED) 757 lbs
91.5 cm
0.746 kw
79.7 cm
0.634 cu. m.
25.44 cmm
327 kg
349.7 kg
50,400 kcal/hr
327 kg
349.7 kg
343.4 kg
APPRO X. WEIGHT (CRATED) 807 lbs
COMPRESSED AIR VO LUME 0.75 cfh
AIR CONNECTION 1/8” F.P.T.
Steam
Shaded areas are stated in metric equivalents
* For non-reversing models.
** A minimum of 3/4-inch pipe must be supplied to the gas inlet for each dryer.
S TEAM C ON S U MP T ION BO I LER HP NO RM AL LO AD
238.7 lbs/hr
O P ERATI NG S TEAM P RE S S URE STEA M SUP P LY STEA M RE TURN
125 PSI max
108.3 kg/hr 7
8.6 bar 1” F.P.T. 1” F.P.T.
366.1 kg
0.02 cmh
IMPORTANT : Steam dryers must be provided with clean, dry , and regulated 80 PSI +/- 10 PSI
(5.51 bar +/- 0.69 bar) air supply .
NOTE: ADC reserves the right to make changes in specifications at any time without notice or
obligation.
6
Specifications
MLG-75V
MLE-75V
MLS-75V
NOTE: ADC reserves the right to make changes in specifications at any time without notice or
obligation.
7
B. COMPONENT IDENTIFICATION
1. Dryer Front View
Illus. No. Description
1 Controls
2 Control (top access) Door Assembly
3 Main Door Assembly
4 Lint Compartment Drawer
5 Data Label and Installation Label (located on the left side panel/wall area behind the control door)
8
2. Dryer Rear View
Illus. No. Description
1 Heating Unit
2 1/8-inch Compressed Air Supply Inlet (behind electric service relay box for steam units Only)
3* Electric Service Relay Box
4 Basket (Tumbler) Bearing Mount Assembly
5 Idler Bearing Mount Assembly
6 Blower Motor Assembly
7 Leveling Leg (rear)
8 Basket (Tumbler) Drive Motor Assembly (reversing models Only)
9 Dryer Exhaust
* Electric service connections for gas and steam models are made in this box.
NOTE: 1/8-inch compressed air supply inlet (for steam models only) is located behind the electric
service relay box.
9
SECTION III
INSTALLATION PROCEDURES
Installation should be performed by competent technicians in accordance with local and state codes. In the
absence of these codes, the installation must conform to applicable American National S tandards: ANSI Z223.1LATEST EDITION (National Fuel Gas Code) or ANSI/NFPA NO. 70-LATEST EDITION (National Electrical
Code) or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1-M91
(Natural Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [L.P.] Gas) or LATEST EDITION (for General
Installation and Gas Plumbing) or Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION
(for Electrical Connections).
A. LOCATION REQUIREMENTS
Before installing the dryer, be sure the location conforms to local codes and ordinances. In the absence of such
codes or ordinances the location must conform with the National Fuel Gas Code ANSI.Z223.1 LATEST
EDITION, or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.
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. 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 .
9. The dryer must be installed with a proper exhaust duct connection to the outside.
10
10. The dryer must be installed with provisions for adequate combustion and make-up air supply.
CAUTION: This dryer produces combustible lint and must be exhausted to the outdoors. Every 6
months, inspect the exhaust ducting and remove any lint build up.
IMPORTANT: Dryer must be installed in a location/environment, which the ambient
temperature remains between 40º F (4.44º C) and 130º F (54.44º C).
B. UNPACKING/SETTING UP
Remove protective shipping material (i.e., plastic wrap, and/or optional shipping box) from dryer.
IMPORTANT : Dryer must be transported and handled in an upright position at ALL times.
The dryer can be moved to its final location while still attached to the skid or with the skid removed. T o unskid
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.
T o 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.
11
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), 18-inches (45.72 cm) or more is recommended for ease of installation, maintenance, and
service above the dryer 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 30-inches (76.2 cm) 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.
NOTE: Air considerations are important for proper and efficient operation.
IMPORTANT : For overhead clearance, 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.
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.
12
D. FRESH AIR SUPPLY REQUIREMENTS
When the dryer is operating, it draws in room air, heats it, passes this air through the basket (tumbler), and
exhausts it out of the building. Therefore, the room air must be continually replenished from the outdoors. If the
make-up air is inadequate, drying time and drying efficiency
sail switch “fluttering” problems may result, as well as premature motor failure from overheating.
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. An airflow of 900 cfm (cubic feet per minute [25.44
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.
will be adversely affected. Ignition problems and
T o compensate for the use of registers or louvers used over the openings, this make-up air must be increased by
approximately thirty-three percent (33%). Make-up air openings should not be located in an area directly near
where exhaust vents exit the building.
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. The dryer must be installed with provisions for adequate combustion and make-up air supply.
EXAMPLE: For a bank of four (4) dryers, two (2) unrestricted openings measuring 2 feet by 1-1/2 feet (6
square feet [0.61 meters by 0.45 meters] [0.56 square meters]) are acceptable.
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.
13
E. EXHAUST REQUIREMENTS
1. General Exhaust Ductwork Information
Exhaust ductwork should be designed and installed by a qualified professional. Improperly sized ductwork
will create excessive back pressure which results in slow drying, increased use of energy, overheating of
the dryer, and shutdown of the burner by the airflow (sail) switches, burner hi-limits, or basket (tumbler)
hi-heat thermostats. The dryer must be installed with a proper exhaust duct connection to the outside.
CAUTION: This dryer produces combustible lint and must be exhausted to the outdoors.
CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUST DUCTWORK CAN
CREA TE A POTENTIAL FIRE HAZARD.
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 15 feet (4.6 meters). The minimum diameter of this ductwork must be at least 10-inches
(25.4 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 (4.6 meters). The shape of the ductwork
the minimum cross-sectional area is provided. It is suggested that the use of 90° turns
and/or 45° angles instead. The radius of the elbows should preferably be 1-1/2 times the diameter of the
duct. Including basket (tumbler)/dryer elbow connections or elbows used for outside protection from the
weather, no more than two (2) elbows should be used in the exhaust duct run. If more than two (2)
elbows are used, the cross-sectional area of the ductwork must be increased.
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.
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.
is not critical so long as
be avoided; use 30°
ALL ductwork should be
ALL
Vertical Venting:
When single dryer venting is used, the length of the ductwork from the dryer to the outside exhaust outlet
must not exceed 20 feet (6.1 meters). The minimum diameter of this ductwork must be at least
12-inches (30.48 cm) even though the dryer exhaust duct for gas and electric units is only 10-inches (25.4
cm). In the case of multiple (common) dryer venting, the distance from the last dryer to the outside exhaust
outlet should not exceed 20 feet (6.1 meters). The shape of the ductwork
minimum cross-sectional area is provided. It is suggested that the use of 90º turns
/or 45º 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.
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.
ALL ductwork joints must be taped to prevent moisture and lint from escaping
is not so critical so long as the
be avoided; use 30º and
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.).
IMPORTANT : Minimum ductwork diameter for horizontal venting is 10-inches (25.4 cm) and for
vertical venting the minimum is 12-inches (30.48 cm).
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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 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
0.0195-inches (26 gauge [0.05 mm]) thick.”
IMPORTANT:
It is recommended that exhaust or booster fans not be used in the exhaust ductwork
system.
a. Outside Ductwork Protection
1) 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.
2. 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 so long as the minimum cross section area is
provided.
IMPORTANT : Minimum duct size for a dryer that is vented horizontally is 10-inches (25.4 cm) for a
round duct or an equivalent of 80 square inches (516 square centimeters). THE
DUCT SIZE MUST NOT BE REDUCED ANYWHERE DOWNSTREAM OF
THE DRYER.
IMPORTANT : Exhaust back pressure measured by a manometer at each basket (tumbler) exhaust
duct area must be no less than 0 and must not exceed 0.3 inches (0.74 mb) of water
column (W .C.).
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