ADC AD-333, Installation Manual, Page: 14 / 18

14 American Dryer Corp. 112175 - 9
IMPORTANT: When plumbing upper and lower tumblers
together, as illustrated on previous page, supply
connection must be a minimum of 3/4” (19.05 mm).
An 1/8” N.P.T. plugged tap, accessible for a test gauge
connection, must be installed in the main gas supply line
immediately upstream of each dryer.
IMPORTANT: Pipe joint compounds that resist the action
of natural gas and L.P. gas must be used.
Test all connections for leaks by brushing on a soapy
water solution (liquid detergent works well).
!
WARNING
NEVER TEST FOR LEAKS WITH A FLAME!!!
The size of the main gas supply line (header) will vary
depending on the distance this line travels from the gas
meter or, in the case of L.P. gas, the supply tank, other gas-
operated appliances on the same line, etc. Specific
information regarding supply line size should be determined
by the gas supplier.
NOTE: Undersized gas supply piping can create a low or
inconsistent pressure, which will result in erratic operation
of the burner ignition system.
Preparation for Operation / Start-Up _
The following items should be checked before attempting
to operate the dryer:
Read all “caution,” “warning,” and “direction” labels attached
to the dryer.
Check incoming supply voltage to be sure that it is the same
as indicated on the dryer data label.
Gas Models – check to ensure that the dryer is connected to
the type of heat/gas indicated on the dryer data label.
The sail switch damper assembly was installed and
adjusted at the factory prior to shipping. However, each sail
switch adjustment must be checked to ensure that this
important safety control is functioning.
Check bolts, nuts, screws, terminals, and fittings for
tightness.
Gas Models – be sure that all gas shutoff valves are in the
open position.
Be sure all back guard panels and service box covers have
been replaced.
Check the lint door to ensure that it is closed and secured in
place.
Rotate the tumbler by hand to be sure it moves freely.
Preoperational Test __________________
All dryers are thoroughly tested and inspected before leaving
the factory. However, a preoperational test should be
performed before the dryer is publicly used. It is possible
that adjustments have changed in transit or due to marginal
location (installation) conditions. Installer must instruct the
user on how to correctly operate the dryer before leaving.
Turn on electric power to the dryer.
Refer to the operating instructions for starting your particular
model dryer.
Gas Dryers
When a gas dryer is first started (during initial start-up), it
has a tendency not to ignite on the first ignition attempt.
This is because the gas supply piping is filled with air, so it
may take a few minutes for the air to be purged from the
lines.
NOTE: During the purging period, check to be sure that
all gas shutoff valves are open.
Gas model dryers are equipped with an ignition system,
which has internal diagnostics. If ignition is not
established after one time, the heat circuit in the ignition
module will attempt two more ignitions (total of three
ignition attempts). If there is no flame after the third
ignition attempt, the module will lock out until it is
manually reset. To reset the ignition system, open and
close the main door and restart the dryer.
A burner gas pressure measurement should be taken at
the gas valve outlet pressure tap of each gas valve to ensure
that the water column pressure is correct and consistent.
NOTE: Water column burner pressure requirements
(measured at the outlet pressure tap of the gas valve body):
Natural Gas ....... 3.5 in WC (8.7 mb).
L.P. Gas .............. 10.5 in WC (26.1 mb).