21
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 consid-
erations 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 ow.
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 ad
equate air ow is maintained. For each individual dryer, the total exhausting
(main discharge duct plus duct outlet from the dryer) should not exceed
the equivalent of 14 feet (4.3m) 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 ow; 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 in. w.c (7.6 mm w.c) 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.
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 rst-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 dryer
MUST be properly grounded.
B. Make sure all gas supply lines are purged of air. Close the main gas shut-o valve and wait for
ve minutes before turning the valve back on.
C. Turn on main electrical power switch. The dryer may be started by following the “OPERATING
INSTRUCTIONS” found later in this manual.
D. Natural gas and liqueed petroleum gas red dryers both operate in the same manner. When
gas-valve relay contacts are closed (indicating a demand for heat), the solid state ignition control will
automatically supply energy to the redundant gas valve. Spark will continue until a ame is detected by
the sensing probe, but not longer than 10 seconds. If the gas fails to ignite within 10 seconds, the gas will
shut o for 15 seconds. The control will attempt to ignite two more times in a similar manner. If the gas
fails to ignite after three tries, the gas valve closes and the system will “lock out”. No further attempts at
ignition will be performed automatically. It is then necessary to interrupt electrical power to the ignition
system before making another attempt to light the burners. This can be done by opening the dryer door,
allowing the dryer to come to a stop for 15 seconds, closing the door, and pushing the “Start” button. The
dryer will then repeat the ignition trial cycle.
Part # 8533-112-001 7/21
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