Dexter Laundry T-80 (Commercial) - Manual (Page 6)

Maintain a 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" (610m), of any objects, which would cause an 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 under any conditions. In both cases, 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. 2). Individual 8" ducts from the dryers into the main discharge duct should be at a 45-degree
angle in the direction of discharge airflow.
NOTE: Never install the individual 8" 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 2 indicates the various
round main duct diameter to use with the individual dryer ducts. The main duct can be rectangular or round,
provided adequate airflow is maintained. For each individual dryer, the total exhausting (main discharge duct
plus duct outlet from the dryer) should not exceed the equivalent of 20 feet (6m) 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 airflow; a large diameter duct will reduce air velocity -- both
contributing to lint buildup. An inspection door should be provided for periodic clean out of the main duct.
8. DRYER IGNITION (SOLID STATE IGNITION). The solid-state ignition system lights the main burner gas by
spark. The gas is ignited and burns only when the gas-valve relay (in the electronic controller) calls for heat. The
procedure for first-time starting of a dryer is as follows:
A. First, review and comply with the “Warnings About Use and Operation” found on the inside front cover of this
manual. Be sure the electrical power supply is connected correctly. The white wire is to be connected to the white
wire (common) in the junction box and the black wire to the black wire (power leg). The dryer MUST be properly
grounded.
B. Make sure all gas supply lines are purged of air. Close the main gas shut-off valve and wait for five minutes
before turning the valve back on.
C. Turn on the main electrical power switch. The dryer may be started by following the “Operating Instructions”
found later in this manual.
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