
8514-254-001 rev. D page 9
These devices may be placed at the power supply panel for the complete installation and don’t
require an individual device for each machine.
These surge protectors help to protect equipment from large spikes and also from small
ongoing spikes in the power that occur on a day to day basis. These smaller surges can
shorten overall life of electrical components of all types and cause their failure at a later date.
Although they can’t protect against all events, these protective devices have a good
reputation for significantly lengthening the useful life of electronic components. Electronic
components are helped to have a longer useful life when they are supplied with the clean
stable electrical power they like.
6. EXHAUST INSTALLATION. (Refer to Figure 3) Exhausting of the dryer(s) should be
planned and constructed so that no air restrictions occur. Any restriction due to pipe size or
type of installation can cause slow drying time, excessive heat, and lint in the room.
From an operational standpoint, incorrect or inadequate exhausting can cause a cycling of the
high limit thermostat, which shuts off the heating elements and results in inefficient drying.
The exhaust duct connection near the top of the dryer will accept a 203 mm (8 in.) round
duct. Individual exhausting of the dryers is recommended. All heat, moisture, and lint should
be exhausted outside by attaching a pipe of the proper diameter to the dryer adapter collar
and extending it out through an outside wall. This pipe must be very smooth on the inside, as
rough surfaces tend to collect lint, which will eventually clog the duct and prevent the dryer
from exhausting properly. All elbows must be smooth on the inside. All joints must be made
so the exhaust end of one pipe is inside the next one downstream. The addition of an
exhaust pipe tends to reduce the amount of air the blower can exhaust. This does not affect
the dryer operation if held within practical limits. For the most efficient operation, it is
recommended that no more than 4.27 m (14 ft.) of straight 203 mm (8 in.) diameter pipe with
two right angle elbows be used for each cylinder. The design of the vent system shall be such
that any condensate formed when operating the dryer from cold shall either be retained and
re-evaporated or discharged.
Maintain a minimum of 25 mm (1 in.) clearance between duct and combustible material.
If the exhaust pipe passes through a wall, a metal sleeve of slightly larger diameter should be
set in the wall and the exhaust pipe passed through this sleeve. This practice is required by
some local codes and is recommended in all cases to protect the wall. This type of installation
should have a means provided to prevent rain and high winds from entering the exhaust when
the dryer is not in use. A hood with a hinged damper can be used for this purpose. Another
method would be to point the outlet end of the pipe downward to prevent entrance of wind
and rain. In either case, the outlet should be kept clear, by at least 610 mm (24 in.), of any
objects, which would cause air restriction.
Never install a protective screen over the exhaust outlet.
When exhausting a dryer straight up through a roof, the overall length of the duct has the
same limits as exhausting through a wall. A rain cap must be placed on top of the exhaust
and must be of such a type as to be free from clogging. The type using a cone shaped “roof”
over the pipe is suitable for this application.
Exhausting the dryer into a chimney or under a building is not permitted. The exhaust air
should not be vented into a wall, a ceiling, or a concealed space of building. In these cases,
there is a danger of lint buildup, which can be highly combustible.