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IMPORTANT: The fan (impellor/blower) shaft rotation must be verified by removing the left side
access panel. When looking at the fan (impellor/blower) shaft assembly, the rotation
should be in a counterclockwise (CCW) direction.
6. 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 Hot Surface Ignition (HSI) Module. This device reacts in a specific
sequence. The first response from the control would be to engage the ignitor. 4-seconds into the
attempt for ignition the gas valve is engaged. Both the ignitor and the gas valve will remain on for
the next 7-seconds. If ignition is unsuccessful, the controlling microprocessor thermostat will attempt
a retry 1 minute after. If the attempt is still unsuccessful, one (1) more retry is attempted 1 minute
later.
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 assure 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 W.C. (8.7 mb).
Liquid Propane (L.P.) Gas ------------ 10.5 W.C. (26.1 mb).
IMPORTANT: There is no regulator provided in a 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.
b. Steam Models
1) Check to insure that the steam damper is functioning properly.
7. Make a complete operational check of ALL safety-related circuits (i.e., lint drawer switch and sail switch
on gas models).