113235 - 5
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25
I. PREOPERATIONAL TEST
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.
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 model 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 lock out 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 ensure 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.
3. Make a complete operational check of
ALL
safety related circuits
a. Door Switches
b. Hi-Limit Thermostats
c. Cycling Thermostat
d. Sail Switch
NOTE:
The sail switch can be checked for proper operation by opening the lint door while the
heating circuit (gas burner) is active (on). The heating until should shut off within a few
seconds. If not, make necessary adjustments to the sail switch.
4. Make a complete operational check of
ALL
operating controls.
Содержание AD-285
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