Continental Girbau DL2X30CG Series Operator's Manual page 6

L.P. gas conversion kits are available for this dryer. Contact your local distributor.
CAUTION: The dryer and its individual shutoff valve must be disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in excess of 1/2 psig. The dryer must be isolated from the gas supply
piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system
at test pressures equal to or less than 1/2 psig.
6. EXHAUST INSTALLATION. (Refer to Figure 3 at the end of section 6.) 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 main burners and results in inefficient drying.
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 collars 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 14 (4.25m) feet of straight 6" diameter pipe with two right angle elbows
be used for each cylinder.
Maintain minimum of 1" (25) 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 24" (610) 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. In either case there is a danger of lint build-
up which can be highly combustible.
Installation of several dryers, where a main discharge duct is necessary, will need the following considerations for
installation (see fig. 3). Individual 6" ducts from the drums or exhausts which have been combined into an 8" duct for
each dryer should enter the main discharge duct at a 45 degree angle in the direction of discharge air flow.
NOTE: Never install the individual ducts at a right angle into the main discharge duct. The individual ducts
from the dryers can enter at the sides or bottom of the main discharge duct. Figure 3 indicates the various
round main duct diameters to use with the individual dryer ducts. The main duct can be rectangular or round,
provided adequate air flow is maintained. For each individual cylinder, the total exhausting (main discharge
duct plus duct outlet from the dryer) should not exceed the equivalent of 14 feet (4.25m) and two elbows.
The diameter of the main discharge duct at the last dryer must be maintained to exhaust end.
NOTE: A small diameter duct will restrict air flow; a large diameter duct will reduce air velocity— both contributing to
lint build up. An inspection door should be provided for periodic clean-out of the main duct.
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