Dexter Laundry B-Series Operator's Manual page 10

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 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. 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. Individual ducts from the dryers into the main discharge duct should be 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. The main duct can be
rectangular or round, provided adequate air flow 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 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.
NOTE: STATIC BACK PRESSURE should be a maximum of 0.3 at the rear exhaust outlet of the dryer. If
multiple dryers are connected to the common duct, ensure the back draft damper is installed properly.
7. 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 (neutral) wire is to
be connected to the N terminal while the black (line) wire to the L1 terminal of the terminal block in the rear
control box. 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.
8514-279-001 REV B PAGE 10