American Dryer Corp ML-175DR User Manual

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ML-175DR Installation Manual

Phase 7 / Non-Coin / DSI with Fire Suppression System

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 death.

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

WHAT TO DO IF YOU SMELL GAS:

Do not try to light any appliance.

Do not touch any electrical switch; do not use any phone in your building.

Clear the room, building or area of all occupants.

Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.

If you cannot reach your gas supplier, call the fire department.

Installation and service must be performed by a qualified installer, service agency or the gas supplier.

AVERTISSEMENT: Assurez-vous de bien suivre les instructions données dans cette notice pour réduire au minimum le risque d’incendie ou d’explosion ou pour éviter tout dommage matériel, toute blessure ou la mort.

Ne pas entreposer ni utiliser d’essence ni d’autres vapeurs ou liquides inflammables à proximité de cet appareil ou de tout autre appareil.

QUE FAIRE SIVOUS SENTEZ UNE ODEUR DEGAZ:

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’installationetl’entretiendoiventêtreassuréspar 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

Telephone: (508) 678-9000 / Fax: (508) 678-9447

E-mail: techsupport@amdry.com

www.amdry.com

ADC Part No. 113406

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 efficient, trouble free, and most importantly, safe 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.

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.

We 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.

Important

For your convenience, log the following information:

DATE OF PURCHASE ________________________________ MODEL NO. __________________________________________ML-175DR Phase 7

RESELLER’S NAME ________________________________________________________________________________________

Serial Number(s)

________________________________________________________________________________________

 

________________________________________________________________________________________

 

________________________________________________________________________________________

Replacement parts can be obtained from your reseller or the ADC factory. When ordering replacement parts from the factory, you can FAX your order to ADC at (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.

“IMPORTANT NOTE TO PURCHASER”

Information must be obtained from your local gas supplier on the instructions to be followed if the user smells gas. These instructions must be posted in a prominent location near the dryer.

IMPORTANT

YOUMUSTDISCONNECTANDLOCKOUTTHEELECTRICSUPPLYANDTHEGAS 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 HealthAdministration) STANDARDS.

“Caution: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper operation.”

«Attention: Lor des opérations d’entretien des commandes étiqueter tous fils avant de les déconnecter. Toute erreur de câblage peut étre une source de danger et de panne.»

CAUTION

DRYER(S) SHOULD NEVER BE LEFTUNATTENDED WHILE IN OPERATION.

WARNING

CHILDREN SHOULD NOT BEALLOWEDTO PLAYON OR NEAR THE DRYER(S).

CHILDREN SHOULD BE SUPERVISED IFNEAR DRYER(S) IN OPERATION.

FOR YOUR SAFETY

DO NOT DRYMOPHEADS IN THE DRYER.

DO NOT USE DRYER IN THE PRESENCE OF DRYCLEANING FUMES.

WARNING

UNDER NO CIRCUMSTANCES should the dryer door switch, 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. PERSONALINJURYOR FIRE COULD RESULT.

WARNING

DRYER MUST NEVER BE OPERATED WITHOUTTHE LINT FILTER/SCREEN IN PLACE, EVEN IFAN EXTERNALLINT COLLECTION SYSTEM IS USED.

IMPORTANT

PLEASE OBSERVEALLSAFETYPRECAUTIONS 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 will be exposed to water or weather.

The wiring diagram for the dryer is located in the front electrical control box area.

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 ..........................................................................................................................................

4

A. Specifications ..........................................................................................................................................

4

SECTION III

 

INSTALLATION PROCEDURES ................................................................................................................

6

A. Location Requirements ...........................................................................................................................

6

B. Unpacking/Setting Up .............................................................................................................................

7

C. Dryer Enclosure Requirements ..............................................................................................................

9

D. Fresh Air Supply Requirements ............................................................................................................

10

E.

Exhaust Requirements ..........................................................................................................................

11

F.

Electrical Information ...........................................................................................................................

17

G.

Gas Information ....................................................................................................................................

20

H.

Steam Information ................................................................................................................................

24

I.

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

28

J.

Preoperational Tests .............................................................................................................................

29

K.

Compressed Air Requirements .............................................................................................................

31

L.

Shutdown Instructions ..........................................................................................................................

32

SECTION IV

 

SERVICE/PARTS INFORMATION ...........................................................................................................

33

A. Service ..................................................................................................................................................

33

B.

Parts......................................................................................................................................................

33

SECTION V

 

WARRANTY INFORMATION ...................................................................................................................

34

A. Returning Warranty Cards ...................................................................................................................

34

B. Warranty ...............................................................................................................................................

34

C.

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

34

SECTION VI

 

ROUTINE MAINTENANCE ......................................................................................................................

36

A. Cleaning ................................................................................................................................................

36

B. Adjustments ..........................................................................................................................................

38

C.

Lubrication ............................................................................................................................................

38

SECTION VII

 

MANUAL RESET BURNER HI-LIMIT INSTRUCTIONS ..................................................................

39

SECTION VIII

 

DATA LABEL INFORMATION .................................................................................................................

40

SECTION IX

 

PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMPONENTS ...................

41

SECTION X

 

FIRE SUPPRESSION SYSTEM ..................................................................................................................

43

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 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 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 RESULT.

WARNING: DO NOT dry rags or articles coated or contaminated with gasoline, kerosene, oil, paint, or wax. EXPLOSION COULD RESULT.

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 rubberlike materials. Drying in a heated basket (tumbler) may damage plastics or rubber and may be a fire hazard.

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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 switch, the lint drawer switch, or the heat safety circuit ever be disabled.

WARNING: PERSONALINJURY OR FIRE COULD RESULT SHOULD THE DRYER DOOR SWITCH, THE LINT DRAWER SWITCH, OR THE HEAT 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.DO NOT operate steam dryers with more than 125 psi (8.62 bar) steam pressure. Excessive steam pressure can damage the steam coil and/or harm personnel.

13.Replace leaking flexible steam hoses or other fixtures immediately. DO NOT operate the dryer with leaking flexible hoses. PERSONAL INJURY MAY RESULT.

14.READ AND FOLLOW ALL CAUTION AND DIRECTION LABELS ATTACHED TO THE DRYER.

15.For safety, proper operation, and optimum performance, the dryer must not be operated with a load less than sixty-six percent (66%), 112 lbs (51 kg) of its rated capacity.

WARNING: YOU MUST DISCONNECTAND LOCKOUT THE ELECTRIC SUPPLYAND THE GAS SUPPLY OR THE STEAM SUPPLY BEFOREANY COVERS OR GUARDS ARE REMOVED FROM THE MACHINE TO ALLOWACCESS FOR CLEANING,ADJUSTING, INSTALLATION, OR TESTING OFANY EQUIPMENT PER OSHA(Occupational Safety and HealthAdministration)

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).

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3

SECTION II

SPECIFICATIONS

A. SPECIFICATIONS

MAXIMUM CAPACITY (DRY WEIGHT)

170 lb

 

77.11 kg

TUMBLER DIAMETER

 

51-1/2”

 

130.81 cm

TUMBLER DEPTH

 

 

 

42-3/4”

 

108.59 cm

TUMBLER VOLUME

 

 

 

51.50 cu ft

 

1.458 cu m

TUMBLER/DRIVE MOTOR

 

3 hp

 

2.24 kW

BLOWER/FAN MOTOR

 

7-1/2 hp

 

5.59 kW

DOOR OPENING (DIAMETER)

 

31-3/8”

 

79.71 cm

DOOR SILL HEIGHT

 

 

 

36-1/2”

 

92.71 cm

WATER CONNECTION

 

3/4”-11.5 NH

DRYERS PER 20’/40’ CONTAINER

 

 

3 / 7

DRYERS PER 48’/53’ TRUCK

 

 

8 / 8

 

VOLTAGE AVAILABLE

 

208-575v 3ø

 

3,4w 50/60 Hz

 

APPROX. NET WEIGHT

 

1,848 lb

 

838.24 kg

Gas

APPROX. SHIPPING WEIGHT

2,014 lb

 

913.54 kg

AIRFLOW

 

 

 

3,700 cfm

 

104.77 cmm

 

 

 

 

 

 

HEAT INPUT

 

 

 

395,000 Btu/hr

 

99,538 kcal/hr

 

EXHAUST CONNECTION (DIAMETER)

12”

 

30.48 cm

 

COMPRESSED AIR CONNECTION

1/4” Quick Connection

 

COMPRESSED AIR VOLUME

4.25 cfh

 

0.12 cmh

 

INLET PIPE CONNECTION

 

1-1/2” F.N.P.T.

Electric

VOLTAGE AVAILABLE

 

 

 

 

APPROX. NET WEIGHT

 

 

 

 

 

 

OVEN SIZE

 

 

 

 

 

APPROX. SHIPPING WEIGHT

 

 

 

 

AIRFLOW

 

 

 

 

 

 

 

EXHAUST CONNECTION (DIAMETER)

N / A

 

COMPRESSED AIR CONNECTION

 

 

 

 

COMPRESSED AIR VOLUME

 

 

 

 

 

 

 

 

 

 

 

 

 

kW

 

Btu/hr

 

kcal/hr

 

 

 

 

VOLTAGE AVAILABLE

 

 

 

 

 

APPROX. NET WEIGHT

 

 

 

 

Steam

APPROX. SHIPPING WEIGHT

 

 

 

AIRFLOW

 

 

 

 

 

 

STEAM CONSUMPTION

 

 

 

 

OPERATING STEAM PRESSURE

N / A

EXHAUST CONNECTION (DIAMETER)

 

 

 

COMPRESSED AIR CONNECTION

 

 

 

COMPRESSED AIR VOLUME

 

 

 

 

BOILER HP (NORMAL LOAD)

 

 

 

 

SUPPLY CONNECTION

 

 

 

 

 

RETURN CONNECTION

 

 

 

 

Shaded areas are stated in metric equivalents

IMPORTANT: Gas dryers and steam dryers must be provided with a clean, dry, regulated 80 psi +/- 10 psi (5.51 bar +/- 0.68 bar) air supply.

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

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SPECIFICATIONS – GAS AND STEAM

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

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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 Standards: ANSI Z223.1- LATEST EDITION (National Fuel Gas Code) or ANSI/NFPA NO. 70-LATEST EDITION (National Electrical Code) or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1-M91 (Natural Gas) or CAN/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.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 adequate clearance for air openings into the combustion chamber.

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CAUTION: This dryer produces combustible lint and must be exhausted to the outdoors. Every 6 months, inspect the exhaust ducting and remove any lint buildup.

IMPORTANT: 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. To remove skid from the dryer, locate and remove the four (4) lag bolts securing the base of the dryer to the wooden skid. Two (2) are at the rear base, and two (2) are located in the bottom of the lint chamber. To remove the two (2) lag bolts located in the lint chamber area, remove the lint drawer and the three (3) Phillips head screws securing the lint door in place.

1.Leveling Dryer

a.To level the dryer, place 4-inch (10.16 cm) square metal shims or other suitable material under the base pads (refer to the illustration above). 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.

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2.If more headroom is needed when moving the dryer into position, the top console (module) may be removed. To Remove Top Console (module):

a.Disconnect the ground wire (A in the illustration below) located at the rear upper left corner of the dryer.

b.Remove the eight (8) sets of nuts and washers (B in the illustration below) holding the console (module) to the base.

c.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).

d.Disconnect air connection from the 3-way micro valve.

e.Lift the console (module) off of the dryer base.

IMPORTANT: The dryer must be transported and handled in an upright position at ALL times.

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C. DRYER ENCLOSURE REQUIREMENTS

Even though a 12-inch (30.48 cm) clearance is acceptable, it is recommended that the rear of the dryer be positioned approximately 24-inches (60.96 cm) from the nearest obstruction (i.e., wall) for ease of installation, maintenance, and service. Bulkheads and partitions should be made from noncombustible materials. 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. A 2-inch (5.08 cm) clearance is required between the bulkhead facing and the top of the dryer.

NOTE: Bulkhead facing should not be installed until after the dryer is in place. Ceiling area must be located a minimum of 12-inches (30.48 cm) above the dryer top console (module) and 18-inches (45.72 cm) for steam models.

NOTE: 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, 1 or 2-inches (2.54 or 5.08 cm) is suggested for ease of installation and maintenance. Allowances must be made for the opening and closing of the control door and the lint door.

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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 will be adversely affected. Ignition problems and sail switch “fluttering” problems may result, as well as premature motor failure from overheating. The dryer must be installed with provisions for adequate combustion and make-up air supply.

Air supply (make-up air) must be given careful consideration to ensure proper performance of each dryer. An unrestricted source of air is necessary for each dryer. As a general rule, an unrestricted air entrance from the outdoors (atmosphere) of a minimum of 4 square feet (0.37 square meters) is required for each gas dryer and a minimum of 4.75 square feet (0.44 square meters) for each steam 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.

It is not necessary to have a separate make-up air opening for each dryer. Common make-up air openings are acceptable. However, they must be set up in such a manner that the make-up air is distributed equally to ALL the dryers.

EXAMPLE: For a bank of six (6) dryers, two (2) unrestricted openings measuring 3 feet by 4 feet (0.91 meters by 1.22 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.

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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 INSTALLED 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.

When single dryer venting is used, the ductwork from the dryer to the outside exhaust outlet should not exceed 15 feet (4.57 meters). In 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 ductwork is not 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. Excluding basket (tumbler)/dryer elbow connections or elbows used for outside protection from the weather, no more than three (3) elbows should be used in the exhaust duct run. If more than three (3) elbows are used, the cross-sectional area of the ductwork must be increased in proportion to the number of elbows used.

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.

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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 26 gauge (0.0195-inches [0.5 mm]) thick.”

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

Outside Ductwork Protection

To protect the outside end of horizontal ductwork from the weather, a 90° elbow bent downward should be installed where the exhaust exits the building. If the ductwork travels vertically up through the roof, it should be protected from the weather by using a 180° turn to point the opening downward. In either case, allow at least twice the diameter of the duct between the duct opening and the nearest obstruction.

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

2.Single Dryer Venting

Where possible, it is suggested to provide a separate exhaust duct for each dryer. The exhaust duct should be laid out in such a way that the ductwork travels as directly as possible to the outdoors with as few turns as possible. It is suggested that the use of 90° turns in the ducting be avoided; use 30° and/or 45° angles instead. The shape of the exhaust ductwork is not critical as long as the minimum cross section area is provided.

IMPORTANT: The minimum duct size for a gas unit is 12-inches (30.48 cm) for a round duct and 10-inches x 10-inches (25.4 cm x 25.4 cm) for a square duct. The minimum duct size for a steam unit is 20-inches (50.80 cm) for a round duct and 18-inches x

18-inches (45.72 cm x 45.72 cm) for a square duct. THE DUCT SIZE MUST

NOT BE REDUCED ANYWHERE DOWNSTREAM OF THE DRYER.

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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.).

It is suggested that the ductwork from each dryer not exceed 15 feet (4.57 meters) with no more than three

(3) elbows (excluding dryer connections). If the ductwork exceeds 15 feet (4.57 meters) or has numerous elbows, the cross-sectional area of the ductwork must be increased in proportion to the length and number of elbows in it. In calculating duct size, the cross-sectional area of a square or rectangular duct must be increased 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 10 feet (3.04 meters). Each 90º elbow is equivalent to an additional 40 feet (12.19 meters), and each 45º elbow is equivalent to an additional 20 feet (6.09 meters).

IMPORTANT: For extended ductwork runs, the cross section area of the ductwork can only be increased to an extent. Maximum proportional ductwork runs cannot exceed 15 feet (4.57 meters) more than the original limitations of 15 feet (4.57 meters) with three (3) elbows. When the ductwork approaches the maximum limits as noted in this manual, a professional heating, ventilating, and air-conditioning (HVAC) firm should be consulted for proper venting information.

ALL ductwork should be smooth inside with no projections from sheet metal screws or other obstructions, which will collect lint. When adding ducts, the duct to be added should overlap the duct to which it is to be connected. ALL ductwork joints must be taped to prevent moisture and lint from escaping into the building. Inspection doors should be installed at strategic points in the exhaust ductwork for periodic inspection and cleaning of lint from the ductwork.

113406-1

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