B&C Technologies DP-250 Industrial - Manual (Page 18)

INSTALLATION PROCEDURES
3-4
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 motors and other dryer components.
NOTE: Component failure due to dry cleaning solvent fumes VOIDS THE WARRANTY.
1. General Exhaust Duct Work Information
Exhaust duct work should be designed and installed by a competent technician. Improperly
sized duct work will create excessive back pressure which will result in slow drying, increased use
of energy , and shutdown of the burner by the airflow (sail) switch, burner hi-limit, or lint chamber
hi-heat protector thermostat.
CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
CAUTION: IMPROPERLY SIZED
OR INSTALLED EXHAUST DUCT WORK CAN
CREA TE POTENTIAL FIRE HAZARD.
NOTE: When a dryer is exhausted separately, it is recommended that a back draft damper be
installed.
NOTE: When dryers are exhausted into a multiple (common) exhaust line, each dryer must be
supplied with a back draft damper.
The duct work should be laid out in such a way that the duct work travels as directly as
possible to the outdoors with as few turns as possible. Single or independent dryer venting is
recommended. When single dryer venting is used, the duct work from the dryer to the outside
exhaust outlet should not exceed twenty (20) feet. In the case of multiple (common) dryer venting,
the distance from the last dryer to the outside exhaust outlet should not exceed twenty (20) feet.
The shape of the duct work is not critical so long as the minimum cross section area is provided. It
is suggested that the use of 90° turns in ducting be avoided; use 30° and/ or 45° angles instead. The
radius of the elbows should preferably be 1-1/2 times the diameter of the duct. Excluding
basket/dryer elbow connections or elbows used for outside protection from the weather, no more
than two (2) elbows should be used in the exhaust duct run. If more than two (2) elbows are used,
the cross section area of the duct work must be increased in proportion to number of elbows added.
ALL
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.
IMPORTANT: Exhaust back pressure measured by a manometer at each basket exhaust duct area
should not exceed 0.3 inches of water column.
NOTE: Where the exhaust duct work 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
Outside Duct Work Protection
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 exhaust 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.
D. EXHAUST REQUIREMENTS