American Dryer Corp ML-96HS installation manual

IMPORTANT: For extended duct work runs, the cross section area of the duct work can only be increased to an extent. Maximum proportional duct work runs cannot exceed twenty

(20)feet more than the original limitations of twenty (20) feet with one (1) elbow for horizontal runs and three (3) elbows for vertical runs. When the duct work approaches the maximum limits as noted in this manual, a professional heating, venting and air conditioning (HVAC) firm should be consulted for proper venting information.

ALL the 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. Inspection doors should be installed at strategic points in the exhaust duct work for periodic inspection and clean-out of lint from the duct work.

NOTE: Where the exhaust duct passes through a wall, ceiling, or roof made of combustible materials, the opening must be 2-inches larger (all the way around) than the duct. The duct must be centered within this opening.

a.Outside Duct Work Protection

1)To protect the outside end of horizontal duct work from the weather, a 90° elbow bent downward should be installed where the exhaust exits the building. If the duct work 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 or caps on the outside of opening of exhaust duct work.

3.Multiple Dryer (common) Venting

If it is not feasible to provide separate exhaust ducts for each dryer, ducts from individual dryers may be channeled into a "common main duct." The individual ducts should enter the bottom or side of the main duct at an angle not more than 45º in the direction of air flow and should be spaced at least 46-inches apart. The main duct should be tapered, with the diameter increasing before each individual duct (16-inch minimum) is added.

IMPORTANT: The ML-96 is not provided with a back draft damper unless the damper option was purchased. When exhausted into a multiple (common) exhaust line, a back draft damper must be installed at each dryer duct.

IMPORTANT: No more than three (3) dryers should be connected to main common duct.

The main duct may be any shape so long as the minimum cross sect is provided. The illustration on page 17 shows the minimum cross section area for multiple dryer round or square venting. These figures must be increased 10 square inches when rectangular main ducting is used, and the ration of duct width to depth should not be greater than 3-1/2 to 1. These figures must be increased in proportion if the main duct run from the last dryer to where it exhausts to the outdoors is unusually long (over twenty [20] feet) or has numerous (more than two [2] elbows in it). In calculating duct work size, the cross section area of a square or rectangular duct must be increased twenty percent (20%) for each additional twenty (20) feet. The diameter of a round exhaust must be increased ten percent (10%) for each additional twenty (20) feet. Each 90º elbow is equivalent to an additional thirty-six (36) feet and each 45º elbow is equivalent to an additional fifteen (18) feet.

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