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D. FRESH AIR SUPPLY
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 (makeup air)
must be
given careful consideration to assure proper performance of each dryer. An
unrestricted source of air is necessary for each dryer. An air flow of 2,700 cfm (cubic feet per minute)
must be
supplied to each dryer. As a general rule, an unrestricted air entrance from the outdoors (atmosphere) of a
minimum of 3 square feet is required for each dryer.
To compensate for the use of registers or louvers used over the openings, this makeup air
must be
increased by
approximately thirty-three percent (33%). Makeup 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 makeup air opening for each dryer. Common makeup air openings are
acceptable. However, they
must be
set up in such a manner that the makeup air is distributed equally to
ALL
the dryers.
EXAMPLE:
For a bank of six (6) dryers, two (2) unrestricted openings measuring 3 feet by 3 feet (18
square feet) is acceptable.
Allowances
must be
made for remote or constricting passageways or where dryers are located at excessive
altitudes or predominantly low pressure areas.
IMPORTANT
: Makeup 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 motors and other dryer components.
NOTE
: Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY.
