American Dryer Corp. AD-75 - Manual (Page 41)

37
J. PREOPERATIONAL TESTS
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.
1. Turn on electric power to the dryer.
a. Open ALL shut-off valves (Gas & models only)
2. Refer to the Operating Instructions for starting your particular model dryer.
3. Gas Dryers
a. 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 shut-off valves are open.
NOTE: Gas dryers are equipped with a Direct Spark Ignition (DSI) system which has internal
diagnostics. If ignition is not established, the heat circuit in the DSI module will lock out
until it is manually reset. To reset the DSI system, open and close the main door and
restart the dryer.
b. A gas pressure test should be taken at the gas valve pressure tap of each dryer to assure
that the water column pressure is correct and consistent.
NOTE: Water column pressure requirements (measured at the pressure tap of the gas valve body):
Natural Gas .......... 3.5 - 4.0 -Inches Water Column
L.P. Gas ................ 10.5-11.0 Inches Water Column
IMPORTANT: There is no regulator provided in an L.P. dryer. The water column pressure
must be regulated at the source (L.P. tank), or an external regulator must be
added to each dryer.
Steam Dryers
a. Check to insure that steam damper is functioning properly.
1. 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 bottom illustration on page 34 for
air adjustment instructions.