American Dryer Corp. Gas/Steam Models ML-82 User manual

041700WM/tcosta ADC Part No. 113143
For replacement parts, contact the distributor from which the dryer
was purchased or
American Dryer Corporation
88 Currant Road
Fall River MA 02720 4781
Telephone: [phone] / Fax: [phone]
E mail: [e-mail]
WARNING: For your safety the
information in this manual must be
followed to minimize the risk of fire or
explosion or to prevent property dama e,
personal injury or death.
Do not store or use asoline or other flammable
vapor and liquids in the vicinity of this or any
other appliance.
WHAT DO YOU DO IF YOU SMELL GAS
* Do not try to li ht any appliance.
* Do not touch any electrical switch; do not use
any phone in your buildin .
* Clear the room, buildin or area of all
occupants.
* Immediately call your as supplier from a
nei hbor's phone. Follow the as supplier's
instructions.
* If you cannot reach your as supplier, call the
fire department.
Installation and service must be performed by a
qualified installer, service a ency or the as
supplier.
AVERTISSEMENT: Assurez-vous de bien
suivre les instructions données dans cette
notice pour réduire au minimumle risque
dincendie ou dexplosion pour ou éviter tout
domma e matériel, toute blessure ou la mort.
Ne pas entreposer ni utiliser dessence ni
dautres vapeurs ou liquides inflammables dans
le voisina ede cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR
DE GAZ:
* Ne pas tenter dallumer dappareil.
* Ne touchez à aucun interrupteur. Ne pas
vous servir des téléphones se trouvant dans
le bâtiment où vous vous trouvez..
* Évacuez la pièce le bâtiment ou la zone.
* Appelez immédiatement votre fournisseur de
az depuis un voisin. Suivez les instructions
du fournisseur.
* Si vous ne pouvez rejoindre le fournisseur
de az appelez le service des incendies.
Línstallation et lentretien doivent être assurés
par un installateur ou un service dentretien
qualiifié ou par le fournisseur de az.
ML-82
(Gas - DSI /Steam Models)
Installation Manual
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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/operators manual
included with the dryer.
The following FOR YOUR SAFETY caution must e posted near the dryer in a prominent location.
IMPORTANT NOTE TO PURCHASER
Information must be obtained from your local as supplier on the instructions
to be followed if the user smells as. These instructions must be posted in a
prominent location near the dryer.
FOR YOUR SAFETY
Do not store or use asoline or
other flammable vapors or
liquids in the vicinity of this or
any other appliance.
POUR VOTRE SÉCURITÉ
Ne pas entreposer ni utiliser dessence
ni dautres vapeurs ou liquides
inflammables dans le voisina e de cet
appareil ou de yout autre appareil.
We have tried to make this manual as complete as possible and hope you ill find it useful. ADC reserves the right to make
changes from time to time, ithout notice or obligation, in prices, specifications, colors, and material, and to change or
discontinue models.
Important
For your convenience, log the following information:
DATE OF PURCHASE ____________________________ MODEL NO. __________________________________________
DISTRIBUTOR S NAME ___________________________________________________________________________________
Serial Number(s) ________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
Replacement parts can be obtained from your distributor or the ADC factory. When ordering replacement parts from the
factory, you can FAX your order to ADC at [phone] or telephone your orders 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.
ML-82
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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 er OSHA (Occupational Safety and Health
Administration) STANDARDS.
CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR
THE DRYER(S).
WARNING
CHILDREN SHOULD BE SUPERVISED IF NEAR DRYER(S) IN
OPERATION.
CAUTION
LABEL ALL WIRES PRIOR O DISCONNEC ION WHEN SERVICING
CON ROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGER-
OUS OPERA ION.
DRYER(S) SHOULD NEVER BE LEF UNA ENDED WHILE IN
OPERA ION.
CAUTION
VERIFY PROPER OPERA ION AF ER SERVICING.
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FOR YOUR SAF TY
DO NOT DRY MOP HEADS IN HE DRYER.
DO NOT USE DRYER IN HE PRESENCE OF DRY CLEANING FUMES.
WARNING
UNDER NO CIRCUMSTANCES should the door switch or the heat
circuit devices ever be disabled.
WARNING
The dryer must never be o erated with any of the back guards, outer to s,
or service anels removed. PERSONAL INJURY or FIRE COULD
RESULT.
IMPORTANT
PLEASE OBSERVE ALL SAFETY PRECAUTIONS dis layed on the
equi ment and/or s ecified in the installation/o erator's manual included with
the dryer.
Dryer(s) must not be installed or stored in an area where it will be exposed to
water and/or weather.
he wiring diagram for the dryer is located in the front electrical control box area.
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Table of Contents
SECTION I
IMPORTANT INFORMATION ............................................................................... 3
A. Receivin and Handlin ............................................................................................................... 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. Unpackin /Settin Up ............................................................................................................... 11
C. Dryer Enclosure Requirements .................................................................................................. 12
D. Fresh Air Supply ....................................................................................................................... 13
E. Exhaust Requirements ............................................................................................................... 14
F. Electrical Information ................................................................................................................ 20
G. Gas Information ........................................................................................................................ 23
H. Steam Information .................................................................................................................... 27
I. Preparation For Operation/Start-Up ......................................................................................... 31
J. Preoperational Tests ................................................................................................................. 32
K. Preoperational Instructions ........................................................................................................ 34
L. Shut Down Instructions ............................................................................................................. 34
SECTION IV
SERVICE/PARTS INFORMATION ...................................................................... 35
A. Service ..................................................................................................................................... 35
B. Parts ........................................................................................................................................ 35
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SECTION V
WARRANTY INFORMATION .............................................................................. 36
A. Returnin Warranty Card(s) ...................................................................................................... 36
B. Warranty .................................................................................................................................. 36
C. Returnin Warranty Part(s) ........................................................................................................ 36
SECTION VI
ROUTINE MAINTENANCE..................................................................................38
A. Cleanin ................................................................................................................................... 38
B. Adjustments ............................................................................................................................. 39
C. Lubrication ............................................................................................................................... 40
D. Lint Drawer Removal ................................................................................................................ 40
SECTION VII
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT
COMPONENTS ........................................................................................................41
SECTION VIII
DATA LABEL LOCATION/INFORMATION ...................................................... 45
A. Data Label ............................................................................................................................... 45
SECTION IX
BURNER AND LINT (TUMBLER) CHAMBER
MANUAL RESET HI-LIMIT INSTRUCTIONS ................................................. 47
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3
SECTION I
IMPORTANT INFORMATION
A. RECEIVING and HANDLING
The dryer is shipped in a protective stretch wrap cover with protective cardboard corners and top cover (or
optional box) as a means of preventing damage in transit. Upon delivery, the dryer and/or packaging, and wooden
skid should be visually inspected for shipping damage. f 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. f there is suspected damage or actual damage, the truckers receipt should be so noted.
3. f 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. f 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. t 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. f you need assistance in handling the situation, please contact the ADC Traffic Manager at [phone].
IMPORTANT: The dryer must be transported and handled in an upri ht position at ALL times.
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B. SAFE Y PRECAU IONS
WARNING: For your safety, the information in this manual must be followed to minimize the risk of
fire or explosion or to prevent property dama e, personal injury, or loss of life.
WARNING: The dryer must never be operated ith any of the back guards, outer tops, or
service panels removed. PERSONAL INJURY or FIRE COULD RESULT.
1. DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
2. Purchaser/user should consult the local gas supplier for proper instructions to be followed in the event the
user smells gas. The instructions should be posted in a prominent location.
3. WHAT TO DO F 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. mmediately call your gas supplier from a neighbors phone. Follow the gas suppliers instructions.
f. f you cannot reach your gas supplier, call the fire department.
4. nstallation and service must be performed by a qualified installer, service agency, or gas supplier.
5. Dryer(s) must be exhausted to the outdoors.
6. Although ADC produces a very versatile machine, there are some articles that, due to fabric composition or
cleaning method, should not be dried in it.
WARNING: Dry only water-washed fabrics. DO NOT dry articles spotted or washed in dry
cleanin solvents, a combustible deter ent, or all purpose cleaner.
EXPLOSION COULD RESULT.
WARNING: DO NOT dry ra s or articles coated or contaminated with asoline, kerosene, oil, paint,
or wax.
EXPLOSION COULD RESULT.
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WARNING: DO NOT dry mop heads. Contamination by wax or flammable solvent will create a fire
hazard.
WARNING: DO NOT use heat for dryin articles that contain plastic, foam, spon e rubber, or
similarly textured rubberlike materials. Dryin in a heated basket (tumbler) may dama e
plastics or rubber and also may be a fire hazard.
7. A program should be established for the inspection and cleaning of lint in the burner area, exhaust duct
work, and area around the back of the dryer. The frequency of inspection and cleaning can best be
determined from experience at each location.
WARNING: The collection of lint in the burner area and exhaust duct work can create a potential fire
hazard.
8. For personal safety, the dryer must be electrically grounded in accordance with local codes and/or the
National Electrical Code ANS /NFPA NO. 70-LATEST ED T ON, or in Canada, the Canadian Electrical
Codes Parts 1 & 2 CSA C22.1-1990 or LATEST ED T ON.
NOTE: Failure to do so will VOID THE WARRANTY.
9. UNDER NO CIRCUMSTANCES should the dryer door switches, lint drawer switch, or heat safety
circuit, ever be disabled.
WARNING: PERSONAL INJURY or FIRE COULD RESULT.
10. This dryer is not to be used in the presence of dry cleaning solvents or fumes.
11. Remove articles from the dryer as soon as the drying cycle has been completed.
WARNING: Articles left in the dryer after the dryin and coolin cycles have been complete can
create a fire hazard.
12. READ and FOLLOW ALL CAUTION and DIRECTION LABELS ATTACHED TO THE DR ER.
WARNING: YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and
THE GAS SUPPLY or THE STEAM SUPPLY BEFORE ANY COVERS or
GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS
FOR CLEANING, ADJUSTING, INSTALLATION, or TESTING OF ANY
EQUIPMENT per OSHA (Occupational Safety and Health Administration)
STANDARDS.
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B ASKET (T UMBLER ) D IAMETER 37" 94 cm
B
ASKET (T UMBLER ) D EPTH 36" 91.5 cm
B
ASKET (T UMBLER ) M OTOR 1/2 HP .373 kw
B
LOWER M OTOR 3 HP 2.238 kw
D
OOR O PENING (D IAMETER ) 21-1/2" 54.61 cm
B
ASKET (T UMBLER ) V OLUME 22.4 cu. ft. .634 cu.m.
D
RYERS P ER 20’/40’’ C ONTAINER 10/20
D
RYERS P ER 45’/48’ T RUCK 24/24
V
OLTAGE A VAILABLE 208-460v / 3ø/ 50 / 60Hz
A
PPROX . W EIGHT ( UNCRATED ) 828 lbs. 375.6 kg
A
PPROX . W EIGHT ( CRATED ) 878 lbs. 398.3 kg
H
EAT I NPUT 270,000 btu/hr 68,040 kcal/hr
A
IRFLOW 1,700 cfm 48.14 cmm
I
NLET P IPE S IZE 1" 2.54 cm
V
OLTAGE A VAILABLE 208-460v / 3ø/ 50 / 60Hz
A
PPROX . W EIGHT ( UNCRATED ) 828 lbs. 392.7 kg
A
PPROX . W EIGHT ( CRATED ) 914 lbs. 415.5 kg
A
IRFLOW 2,500 cfm 98.8 cmm
A
IR C ONNECTION 1/8" F.P.T. ---
S
TEAM C OMSUMPTION
B OILER HP
N
ORMAL L OAD
375 lbs/hr 170.5 kg/hr 11
O
PERATING S TEAM P RESSURE S TEAM S UPPLY S TEAM R ETURN
125 psi max 8.79 kg/cm
2
1" 2.54 cm 1" 2.54 cm
Shaded areas are stated in metric equivalents
Gas
Steam
SECTION II
SPECIFICATIONS/COMPONENT IDENTIFICATION
A. SPECIFICA IONS
IMPORTANT: Steam dryers must be provided with a clean, dry, re ulated 80 PSI +/- 10 PSI (5.51
kPa +/- 0.68 kPa) air supply.
NOTE: ADC reserves the ri ht to make chan es in specifications at any time, without notice or
obli ation.
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Specifications
ML-82
(Gas and Steam ONLY)
NOTE: ADC reserves the ri ht to make chan es in specifications at any time, without notice or
obli ation.
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B. COMPONEN IDEN IFICA ION
1. Dryer Front View
llus. No. Description
1 Controls
2 Control (top access) Door Assembly
3 Main Door Assembly
4 Lint Compartment Area (lint screen located behind door)
5 Lint Drawer
6 Data Label and nstallation Label (located behind control [service] door)
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2. Dryer Rear View
llus. No. Description
1 Heating Unit
2 1/8 (3.175 mm) Compressed Air Supply nlet
(behind Electric Service Relay Box for Steam Models ONLY)
3* Electric Service Relay Box
4 Tumbler Bearing Mount Assembly
5 dler Bearing Mount Assembly
6 Basket (Drive) Motor Assembly (for Reversing Models ONLY)
7 Blower Motor Assembly
8 Dryer Exhaust
* Electric service connections for gas models and steam models are made in this box.
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SECTION III
INSTALLATION PROCEDURES
nstallation should be performed by competent technicians in accordance with local and state codes. n the
absence of these codes, the installation must conform to applicable American National Standards: ANS Z223.1-
LATEST ED T ON (National Fuel Gas Code) or ANS /NFPA NO. 70-LATEST ED T ON (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 ED T ON (for General nstallation and Gas
Plumbing) or Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST ED T ON (for Electrical
Connections).
A. LOCA ION REQUIREMEN S
Before installing the dryer, be sure the location conforms to local codes and ordinances. n the absence of such
codes or ordinances the location must conform with the National Fuel Gas Code ANS .Z223.1-LATEST
ED T ON.
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 in
Section D).
5. Clearance provisions must be made from combustible construction as noted in this manual (refer to Dryer
Enclosure Requirements in Section C).
6. Provisions must be made for adequate clearances for servicing and for operation as noted in this manual
(refer to Dryer Enclosure Requirements in Section C).
7. Dryer must be exhausted to the outdoors (refer to Exhaust Requirements in Section E).
8. Dryer must be located in an area where correct exhaust venting can be achieved as noted in this manual
(refer to Exhaust Requirements in Section E).
IMPORTANT: Dryer should be located where a minimum amount of exhaust duct ill be necessary.
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B. UNPACKING/SE ING UP
Remove protective shipping material (i.e., plastic wrap and optional shipping box) from dryer.
IMPORTANT: Dryer must be transported and handled in an upri ht position at ALL times.
The dryer can be moved to its final location with or without the skid attached. To unskid the dryer, locate and
remove the four (4) bolts securing the base of the dryer to the wooden skid. Two (2) are located at the rear base
(remove the back panel for access), and two (2) are located in the bottom of the lint chamber. To remove the two
(2) bolts located in the lint chamber area, remove lint drawer completely. (Refer to page 40 for lint drawer
removal instructions.) Once the bolts are removed and the lint drawer is reinserted, slide the dryer off of the skid.
With the skid removed, to make it easier to slide the dryer into its final position, slightly lower ALL four leveling
legs, so that the dryer will slide on the legs instead of the base frame.
1. nside the basket (tumbler) of this dryer is an exhaust transition
piece that must be installed on the outlet of the exhaust before
any further venting is connected. To do this, follow the procedures
listed below:
a. Remove the exhaust transition piece from the basket (tumbler)
and place it on the exhaust outlet.
b. Using the screws provided, secure the exhaust transition piece
to the dryer.
NOTE: It is recommended that this joint be taped as well as
ALL other duct joints to prevent moisture and lint from
escapin into the buildin .
WARNING
An exhaust duct transition piece is shipped inside of the dryers
tumbler and must be installed on the dryers exhaust duct, with
the hardware provided, BEFORE location venting is connected
to the dryer.
THIS EXHAUST DUCT TRANSITION PIECE
MUST BE INSTALLED FIRST!
Failure to observe this installation requirement may result in damage
to the dryer, create a FIRE HAZARD and will VOID the
manufacturers warranty.
012999JEV-GS/cj P/N: 114092
2. Leveling Dryer
The dryer is equipped with four (4) leveling legs, one at each corner
of the dryer base. Two (2) are located at the rear of the dryer
base, and two (2) are located in the lint chamber. To increase
bearing life and improve efficiency, the dryer should be tilted
slightly to the rear.
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C. DRYER ENCLOSURE REQUIREMEN S
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 openin the control door.
Dryers may be positioned side wall to side wall. However, a 1/16 (1.5875 mm) minimum allowance must be
made for opening and closing of the control door and the lint door. t is suggested that the dryer be positioned
about 2 feet (0.61 meters) away from the nearest obstruction for ease of installation, maintenance, and service
(to be measured from the back guard). Refer to the illustration above for details.
NOTE: Air considerations are important for proper and efficient operation.
IMPORTANT: Even thou h a minimum of only 12-inches (30.48 cm) is required, 18-inches (45.72
cm) or more is su ested. The additional clearance is advanta eous for ease of
installation and service.
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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
side wall to side wall, 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 openin and closin s of the control door and the lint door.
D. FRESH AIR SUPPLY
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. f the
make-up air is inadequate, drying time and drying efficiency will be adversely affected. gnition 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 assure proper performance of each dryer. An
unrestricted source of air is necessary for each dryer. An airflow of 1,700 cfm (cubic feet per minute) - 48.14
cmm (cubic meters per minute) - must be supplied to each gas and electric dryer and 2,500 cfm (70.79 cmm)
must be supplied to each steam dryer. As a general rule, an unrestricted air entrance from the outdoors
(atmosphere) of a minimum of 2-1/2 square feet (0.23 square meters) is required for each dryer.
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.
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14
t is not necessary to have separate make-up air openings 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 (4) dryers, two (2) unrestricted openings measuring 2 feet by 2-1/2 feet
(0.61 meters by 0.76 meters) - 10 square feet (0.93 square meters) - is 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 cleanin solvent fumes.
Make-up air that is contaminated by dry cleanin solvent fumes will result in
irreparable dama e to the motors and other dryer components.
NOTE: Component failure due to dry cleanin solvent fumes will VOID THE WARRANTY.
E. EXHAUS REQUIREMEN S
1. General Exhaust Duct Work nformation
Exhaust duct work should be designed and installed by a qualified professional. mproperly sized duct
work will create excessive back pressure which results in slow drying, increased use of energy, overheating
of the dryer, and shut down of the burner by the airflow (sail) switches, burner hi-limits, or basket (tumbler)
hi-heat thermostats.
CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
CAUTION: IMPROPERLY SIZED or INSTALLED EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.
The duct work should be laid out in such a way that the duct work travels as directly as possible to the
outdoors with as few turns as possible. Single or independent dryer venting is recommended.
When single drying venting is used the length of duct work from the dryer to the outside exhaust outlet
should not exceed 15 feet (4.57 meters). The minimum diameter of this duct work must be at least
14-inches (35.56 cm). n the case of multiple (common) dryer venting, the distance from the last dryer to
the outside exhaust outlet should not exceed 15 feet (4.57 meters). The shape of the duct work is not
critical so long as the minimum cross-sectional area is provided. t 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. ncluding basket (tumbler) and 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. f more
than two (2) elbows are used, the cross-sectional area of the duct work must be increased. ALL duct
work 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 duct work joints must be taped to prevent moisture and lint from escaping into the building. nspection
door should be installed at strategic points in the exhaust duct work for periodic inspection and clean-out of
lint from the duct work.
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ALL duct work 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 duct work joints must be taped to prevent moisture and lint from escaping into the
building. nspection doors should be installed at strategic points in the exhaust duct work for periodic
inspection and clean-out of lint from the duct work.
IMPORTANT: Exhaust back pressure measured by a manometer in the exhaust duct should not
exceed 0.3 inches of water column (0.74 mb).
IMPORTANT: Exhaust duct work diameter for as models is 14-inches (35.56 cm) and 16-inches
(40.64 cm) for steam models.
NOTE: Where the exhaust duct work passes throu h a wall, ceilin , or roof made of combustible
materials, the openin must be 2-inches (5.08 cm) lar er (all the way around) than the duct.
The duct must be centered within this openin .
a. Outside Duct Work Protection
1) To protect the outside end of horizontal duct work from the weather, a 90º elbow bent downward
should be installed where the exhaust exits the building. f the duct work travels vertically up
through the roof, it should be protected from the weather by using a 180º turn to point the opening
downward. n either case, allow at least twice the diameter of the duct opening and the nearest
obstruction.
IMPORTANT: DO NOT use screens or caps on the outside of openin of exhaust duct work.
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16
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 duct work travels as directly as possible to the outdoors with as few turns
as possible. t 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 duct work is not critical so long as the minimum cross section area is
provided.
IMPORTANT: For a dryer that is vented horizontally, the minimum duct size for a as dryer is
14-inches (35.56 cm) for a round duct or 12-1/2 (31.75 cm) for a square duct. The
minimum duct size for a steam dryer is 16-inches (40.64 cm) for a round duct or
14-1/2 x 14-1/2 (36.83 cm x 36.83 cm) for a square duct. THE DUCT SIZE
MUST NOT BE REDUCED AN WHERE DOWN STREAM OF THE
DR ER.
IMPORTANT: Exhaust back pressure measured by a manometer at each basket (tumbler) exhaust
duct area should not exceed 0.3 inches of water column (0.74 mb).
t is suggested that the duct work from each dryer not exceed 15 feet (4.57 meters) with no more than two
(2) elbows (excluding dryer connections and outside exhaust outlets). f the duct work exceeds 15 feet
(4.57 meters) or has numerous elbows, the cross section area of the duct work must be increased in
proportion to the length and number of elbows in it. n calculating duct size, the cross section area of a
square or rectangular duct must be increased by twenty percent (20%) for each additional 15 feet (4.57
meters). The diameter of a round exhaust duct should be increased ten percent (10%) for each additional
15 feet (4.57 meters). Each 90º elbow is equivalent to an additional 30 feet (9.14 meters), and each 45º
elbow is equivalent to an additional 15 feet (4.57 meters).
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