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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 gas shut-off valves.
2. Refer to the Operating Instructions for starting your particular model dryer.
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.
NOTE: During the purging period, check to be sure that ALL gas shut-off valves are open.
NOTE: Gas dryers are equipped with a Hot Surface Ignition (HSI) system which has internal
diagnostics. If ignition is not established within three times the heat circuit in the HSI module
will "LOCK-OUT" until it is manually reset. To reset the HSI system, open and close the main
door and restart the dryer.
2) 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 (W.C.) pressure requirements (measured at the gas valve pressure tap)...
Natural Gas ---------3.5 Inches W.C.
L.P. Gas ------------ 10.5 Inches W.C.
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