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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.
2. Refer to the Operating Instructions for starting your particular model dryer.
3. 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.
NOTE: Dryers are equipped with a Direct Spark Ignition (DSI) system, which has internal diagnostics.
If ignition is not established after the first attempt, the heat circuit in the DSI module will
lockout until it is manually reset. To reset the DSI system, open and close the main door and
restart the dryer.
a. 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.
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.
4. Make a complete operational check of ALL safety related circuits:
a. Door Switches
b. Hi-Limit Thermostats
c. Cycling Thermostat
NOTE: The sail switch can be checked for proper operation by opening the lint door while heating
circuit (gas burner or electric oven) is active (on). The heating unit should shut off within a few
seconds. If not, make necessary adjustments to the sail switch.
5. Make a complete operational check of ALL operating controls.