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
shutoff valves (gas models Only).
2. Refer to the Operating Instructions for starting your particular model dryer.
3. Gas Dryers
a. 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:
Gas dryers are equipped with a Direct Spark Ignition (DSI) system, which has internal
diagnostics. If ignition
is
not
established within three (3) times, 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.
b. 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. Steam Dryers
a. Check to insure that steam damper is functioning properly.
1) 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
bottom illustration
on
page 34
for steam
damper air piston (flow control) operation adjustment instructions.
Summary of Contents for ML-75DIII
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