American Dryer ML-190 User Manual
ML-190 Installation Manual
Phase 7 with F.S.S. – Gas – DSI / Steam
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 dep artment.
— 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. 113354- 8
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 Y OUR 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 VO TRE 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-190
________________________________________________________________________________________
________________________________________________________________________________________
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 +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 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.
!
▲ WARNING
Proposition 65
Use of this product could expose you to substances from fuel combustion
that contain chemicals known to the State of California to cause cancer ,
birth defects and other reproductive harm.
IMPORTANT
YOU MUST DISCONNECT AND LOCKOUT THE ELECTRIC 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.
“Caution: Label all wires prior to
disconnection when servicing
controls. W iring 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.»
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, the 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
SAFETY PRECAUTIONS .............................................................................................................................. 2
SECTION II
SPECIFICATIONS/COMPONENT IDENTIFICATION .........................................................................4
A. Specifications..........................................................................................................................................4
B. Component Identification ....................................................................................................................... 6
SECTION III
INSTALLATION PROCEDURES ................................................................................................................8
A. Location Requirements ..........................................................................................................................8
B. Unpacking/Setting Up ............................................................................................................................ 9
C. Dryer Enclosure Requirements............................................................................................................ 11
D. Fresh Air Supply Requirements ........................................................................................................... 12
E. Exhaust Requirements ......................................................................................................................... 13
F. Electrical Information ........................................................................................................................... 19
G. Gas Information.................................................................................................................................... 23
H. Steam Information................................................................................................................................ 27
I. Preparation for Operation/Start-Up ..................................................................................................... 31
J. Preoperational Tests............................................................................................................................. 32
K. Preoperational Instructions................................................................................................................... 34
L. Compressed Air Requirements ............................................................................................................ 35
M. Shutdown Instructions .......................................................................................................................... 36
SECTION IV
SERVICE/PARTS INFORMATION ...........................................................................................................37
A. Service .................................................................................................................................................. 37
B. Parts ...................................................................................................................................................... 37
SECTION V
WARRANTY INFORMATION ...................................................................................................................38
A. Returning Warranty Cards ................................................................................................................... 38
B. Warranty ............................................................................................................................................... 38
C. Returning Warranty Parts .................................................................................................................... 38
SECTION VI
ROUTINE MAINTENANCE ......................................................................................................................40
A. Cleaning ................................................................................................................................................ 40
B. Adjustments .......................................................................................................................................... 42
C. Lubrication ............................................................................................................................................ 42
SECTION VII
DATA LABEL INFORMATION ................................................................................................................43
SECTION VIII
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMPONENTS .................44
SECTION IX
MANUAL RESET BURNER HI-LIMIT INSTRUCTIONS .................................................................46
SECTION X
FIRE SUPPRESSION SYSTEM (F.S.S.) ....................................................................................................47
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. 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.
2
WARNING: DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or
similarly textured rubberlike materials. Drying in a heated basket (tumbler) may damage
plastics or rubber and 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 electrically ground the dryer properly 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 INJURY OR FIRE COULD RESUL T SHOULD THE DR YER
DOOR SWITCHES, THE LINT DRAWER SWITCH, OR THE HEA T SAFETY
CIRCUIT EVER BE DISABLED.
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. READ AND FOLLOW ALL CAUTION AND DIRECTION LABELS ATTACHED TO THE
DRYER.
13. For safety, proper operation, and optimum performance, the dryer must not be operated with a load less
than sixty-six percent (66%), 125 lb (56.69 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, INST ALLA 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 40° F (4.44° C) and 130° F (54.44° C).
3
SPECIFICATIONS/COMPONENT IDENTIFICA TION
A. SPECIFICATIONS
SECTION II
MAX IMUM C A PACITY (DRY WEIGHT) 1 90 l b
TUMBLER DIAMETER 55-5/8”
TUMBLER DEPTH 43-1/2”
TUMBLER VOLUME 61.20 cu ft
TUMBLER/DRIV E MOTO R 3 hp
BLOWER/FAN MOTOR 7- 1/2 hp
DOOR OPENING (DIAMETER) 31-3/8”
DOOR SILL HEIGHT 36”
WATER CONNECTION 3/4”-11.5 NH
DRYERS PER 20’/40’ C ONTAINER 3 / 7
DRYERS PER 48’/53’ TRUCK 8 / 8
VOLTAGE AVAILABLE 208-575v 3ø 3,4w 50/60 Hz
APPROX. NET WEIGHT 2,100 lb
APPROX. SHIPPING WEIGHT 2,166 lb
AIRFLOW 4,200 cfm
HEAT INPUT 590,000 Btu/hr
EX HAUST CONNECTION (DIAMETER) 2 0”
GasSteam Electric
COMPRESSED AIR CONNECTION 1/4 ” Qui c k Co nnection
COMPRESSED AIR VOLUME 4.25 cfh
INLET PIPE CONNECTION 1-1 / 2 ” F.N.P.T.
VOLTAGE AVAILABLE
APPROX. NET WEIGHT
APPROX. SHIPPING WEIGHT
AIRFLOW
EX HAUST CONNECTION (DIAMETER)
COMPRESSED AIR CONNECTION
COMPRESSED AIR VOLUME
OVEN SIZE
kW Btu/hr
VOLTAGE AVAILABLE 208-575v 3ø 3,4w 50/60 Hz
APPROX. NET WEIGHT 2,349 lb
APPROX. SHIPPING WEIGHT 2,515 lb
AIRFLOW 4,400 cfm
STEAM CONSUMPTION 725 lb/hr
OPERATING STEAM PRESSURE 125 psi max
EX HAUST CONNECTION (DIAMETER) 2 0”
COMPRESSED AIR CONNECTION 1/4 ” Qui c k Co nnection
COMPRESSED AIR VOLUME 4.25 cfh
BOILER HP (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 9/27/04
kcal/hr
N / A
86.18 kg
141.29 cm
110.49 cm
1732.99 L
2.24 kW
5.59 kW
79.71 cm
91.44 cm
952.54 kg
982.48 kg
118.93 cmm
148,678 kcal/hr
50.80 cm
0.12 cmh
1,065.49 kg
1,140.78 kg
124.59 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 ± 0.69 bar) air supply .
NOTE: ADC reserves the right to make changes in specifications at any time without notice or
obligation.
4
Specifications
NOTE: ADC reserves the right to make changes in specifications at any time without notice or
obligation.
5
B. COMPONENT IDENTIFICATION
1. Dryer Front View
Illus. No. Description
1 Microprocessor Control/Keyboard (touch pad) Panel Assembly (controls)
2 Control (top access) Door Assembly
3 Main Door Assembly
4 Lint Drawer
5 Lint Door
6 Wire Diagram (located behind control door)
7 Data Label and Installation Label
8 T op Console (module) Assembly
6
Dryer Front Internal View
2.
Illus. No. Description
1 Drive (basket [tumbler]) Motor
2 Drive Assembly
3 Blower Motor
4 Idler Assembly
5 Installation Label
6 Data Label
7 Heating Unit
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 Z223.1LATEST 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. 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.
8
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.
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 : 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) 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 (refer to the illustration above) or
other suitable material under the base pads. It is suggested that the dryer be tilted slightly to the rear.
b. The V-belts are disconnected from the basket (tumbler) drive motor for shipping. Reconnect V-belts
before starting the dryer.
9
2. If more headroom is needed when moving the dryer into position, the top console (module) may be removed.
T o Remove T op 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
C. DRYER ENCLOSURE REQUIREMENTS
Bulkheads and partitions should be made of noncombustible material.
NOTE: Allowances must be made for opening the control door .
A 38-inches (96.52 cm) for optimum opening of load door.
B The maximum thickness of the bulkhead for gas dryers is 4-inches (10.16 cm). For electric and steam dryers
the maximum thickness of the bulkhead is 1-inch (2.54 cm) within 3-inches (7.62 cm) from the top of the
control door.
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 Dryer should be positioned 12-inches (30.48 cm) away from the nearest obstruction and 24-inches (60.96
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 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.
11
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 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 4.5 square feet (0.41 square meters) is required for each dryer. (Based
on 1 square inch per 1,000 Btu.)
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
combustion and make-up air supply.
EXAMPLE: For a bank of six (6) dryers, two (2) unrestricted openings measuring 3 feet by 4.5 feet (0.91 meters
by 1.37 meters) are acceptable.
ALL the dryers. The dryer must be installed with provisions for adequate
will be adversely affected. Ignition problems and
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
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: IMPROPERLY SIZED OR INST ALLED EXHAUST DUCTWORK CAN
CREATE A POTENTIAL FIRE HAZARD.
NOTE: When a dryer is exhausted separately , it is recommended that a back draft damper be
installed.
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.
NOTE: Make-up air openings should not be located in an area directly near where the exhaust vents
exit the building. 159 inches per 1,000 Btu.
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.
IMPORTANT : It is recommended that exhaust or booster fans not be used in the exhaust ductwork
system.
13
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