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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 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 must be given careful consideration to ensure proper performance of each dryer. As a general rule,
an unrestricted air entrance from the outdoors of 550 square inches (3548 cm
and 375 square inches (2419 cm
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.
To compensate for the use of registers or louvers used over the openings, this area must be increased by
approximately 33%. Make-up air openings should not be located in an area directly ear where the exhaust
vents exit the building.
Allowances must be made for remote or constricting passageways or where dryers are located at high altitudes
or predominantly low pressure areas.
NOTE: Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY.
Example: For a bank of six MD-170 dryers, two (2) openings measuring 3 feet by 4 feet (0.92 meters by 1.2
meters), which equals 24 square feet (2.23 square meters) are acceptable.
IMPORTANT: Make-up air must be free of dry cleaning solvent fumes. Make-up air that is
contaminated by dry cleaning fumes will result in irreparable damage to motors and
other dryer components.
113395 - 6
) for each MD-120. (Based on 1 inch
2
Maytag Co.
) is required for each MD-170,
2
[6.5 cm
] per 1,000 Btu [252 kcal].)
2
2
15
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