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36
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 shut-off valves (for Gas Models and Steam Models ONLY)
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 pressure is correct and consistent.
NOTE: Water column pressure requirements (measured at the gas valve pressure tap)...
Natural Gas --------- 3.5 - 4.0 Inches W.C.
L.P. Gas ------------ 10.5 - 11.0 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.
b. Steam Models
1) Check to insure that steam damper is functioning properly.
a) The steam damper should not "slam" (open or closed) when it reaches the end of (piston) travel.
Additionally, the steam damper should not bind and/or stop during travel. If either of these
conditions occur, the flow control must be adjusted. Refer to the illustration on page 34 for air
adjustment instructions.