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I. 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 shutoff valves.
2. Refer to the Operating Instructions for starting your particular model dryer.
a. 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.
1) A gas pressure test should be taken at the gas valve pressure tap of each dryer to assure that the
water column (W.C.) pressure is correct and consistent.
a) If the dryer is equipped with a Direct Spark Ignition (DSI) system, the DSI control module has
internal diagnostics. If ignition is not established within three (3) attempts, the heat circuit in the
DSI control module will “LOCKOUT” until manually reset. To reset the DSI system, open and
close the main door and restart the dryer.
b) If the dryer is equipped with a Hot Surface Ignition (HSI) system, the HSI control module has
internal diagnostics. If ignition is not established after the first attempt, the heat circuit in the
HSI control module will “LOCKOUT” until manually reset. To reset the HSI system, open and
close the main door and restart the dryer.
NOTE: During the purging period, check to be sure that ALL gas shutoff valves are open.
NOTE: Water column pressure requirements (measured at the pressure tap of the gas valve body)...
Natural Gas---------------------3.5 Inches (8.7 mb) Water Column.
Liquid Propane (L.P.) Gas ----10.5 Inches (26.1 mb) 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.
3. Make a complete operational check of ALL safety related circuits:
a. Door switch(es)
b. Hi-Limit thermostats
c. Sail switch