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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.
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.
b. 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.
c. 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 “LOCK OUT” until manually reset. To reset the DSI 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
NOTE: To check for proper sail switch operation, open the main door and while holding main door
switch plunger in, start the dryer. Dryer should start but heat circuit should not be activated
(on). If the heat system is activated, the sail switch is improperly adjusted and must be
adjusted by bending the actuator arm of the sail switch toward the burner box. If the actuator
arm is bent to far toward the burner box of the dryer, the dryer may not have heat when
needed. After any adjustment to the sail switch, the above procedure must be repeated to
verify proper operation of the sail switch.