American Dryer Corp ML-55II Fresh Air Supply Requirements, Exhaust Requirements

Important

Even though a minimum of only 12-inches (30.48

!cm) is required, 18-inches (45.72 cm) or more is suggested . The additional clearance is advantageous for ease of installation and service.

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.

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. An airflow of 600 cfm (cubic feet per minute [17 cmm] [cubic meters per minute]) must be supplied to each gas, electric, and steam dryer. As a general rule, an unrestricted air entrance from the outdoors (atmosphere) of a minimum of 1-1/4 square foot (0.12 square meters) is required for each dryer. The dryer must be installed with provisions for adequate combustion and make-up air supply.

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 four (4) dryers, two (2) unrestricted openings measuring 2 feet by 1-1/4 feet (0.61 meters by 0.38 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.

Exhaust Requirements _________________

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.

Improperly sized or installed exhaust ductwork can create a potential fire hazard.

Important

It is recommended that exhaust or booster fans not

!be used in the exhaust ductwork system.

The ductwork should be laid out in such a way that the ductwork travels as directly as possible to the outdoors with as few turns as possible. Single or independent dryer venting is recommended.

Horizontal Venting

When single dryer venting is used, the length of the ductwork from the dryer to the outside exhaust outlet must not exceed 30 feet (9.1 meters). The minimum diameter of this ductwork must be at least 8-inches (20.32 cm). In the case of multiple (common) dryer venting, the distance from the last dryer to the outside exhaust outlet must not exceed 15 feet (4.6 meters). The shape of the ductwork is not critical as long as the minimum cross-sectional area is provided. It is

6 American Dryer Corp. 113345-9