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American Dryer Corp.
113363 - 37
K. 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.
1. Turn on electric power to the dryer.
2. Make sure the main door is closed and the lint drawer is securely in place.
3. Refer to the Operating Instructions for starting your particular model dryer.
4. Check to ensure that the tumbler starts in the clockwise (CW) direction. Additionally, check the direction
of the motorized impellor to ensure that the motorized impellor rotates in the clockwise (CW) direction as
viewed from the front. If it is, the phasing is correct. If the phasing is incorrect, reverse two (2) of the
leads at L1, L2, or L3 of the power supply connections made to the dryer.
IMPORTANT: Motorized impellor as viewed from the front must turn in the clockwise (CW)
direction, otherwise the dryer efficiency will be drastically reduced and premature
component failure can result.
5. Heat Circuit Operational Test
a. Gas Models
1) When the dryer is first started (during initial start-up), the burner has a tendency not to ignite on the
first attempt. This is because the gas supply piping is filled with air, so it may take a few minutes for
this air to be purged from the lines.
2) The dryer is equipped with a Direct Spark Ignition (DSI) system, which has internal diagnostics. If
ignition is not established after three (3) attempts, the heat circuit DSI module will LOCKOUT until
it is manually reset. To reset the DSI system, open and close the main door and restart the dryer
(press the “START” key).
NOTE: During the purging period, check to be sure that ALL gas shutoff valves are open.
3) Once ignition is established, a gas pressure test should be taken at the gas valve pressure tap of
each dryer to ensure that the water column (W.C.) pressure is correct and consistent.
NOTE: Water column pressure requirements (measured at the gas valve pressure tap):
Natural Gas ---------------------- 3.5 inches (8.7 mb) water column.
Propane Gas -------------------- 10.5 inches (26.1 mb) water column.
IMPORTANT: There is no regulator provided in a propane dryer. The water column pressure must
be regulated at the source (propane tank) or an external regulator must be added to
each dryer.
b. Steam Models
Check to ensure that the (standard) steam damper or (optional) steam solenoid valve is functioning
properly: the steam damper should not “slam” (open or closed) when it reaches the end of (piston)
travel. Additionally, the steam damper should not bind and/or stop during travel. If either of these
conditions occur, the flow control must be adjusted. Refer to the illustration on page 30 for air
adjustment instructions.
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