B&C Technologies DI-475 Industrial - Manual (Page 12)

C. 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 problem 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 assure proper performance of
each dryer. An unrestricted source of air is necessary for each dryer. An airflow must be
supplied to each dryer as specified in specification. As a general rule, an unrestricted air
entrance from the outdoors (atmosphere) of a minimum of five (5) square feet is required for
each gas dryer and a minimum of six (6) square feet is required for each steam dryer.
To compensate for the use of registers or louver used over the opening, this make-up air
area must be increased by approximately thirty-three (33) percent. 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.
Allowances must be made for remote or constricting passageways or where dryers are
located at excessive altitudes or predominantly low pressure areas.
IMPORTING: 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 motors and other dryer
components.
NOTE: Component failure due to dry cleaning solvent fumes VOIDS
WARRANTY.