American Dryer Corp. SL20 - Manual (Page 12)

10 113191-2
Important
The gas supply line to each dryer must be a minimum
of 3/8-inch (9.5 mm). Do not reduce this pipe size
requirement.
The size of the main gas supply line (header) will vary
depending on the distance this line travels from the gas meter
or, in the case of liquid propane (L.P.) gas, the supply tank,
other gas-operated appliances on the same line, etc. Specific
information regarding supply line size should be determined
by the gas supplier.
Note
Undersized gas supply piping can create a low or
inconsistent pressure, which will result in erratic
operation of the burner ignition system.
Consistent gas pressure is essential at all gas connections.
It is recommended that a 1/2” (12.7 mm) pipe gas loop be
installed in the supply line servicing a bank of dryers. An
in-line pressure regulator must be installed in the gas supply
line (header) if the (natural) gas pressure exceeds
12.0 inches (29.9 mb) of water column (W.C.) pressure.
A 1/8” N.P.T. plugged tap, accessible for a test gauge
connection, must be installed in the main gas supply line
immediately upstream of each dryer.
Important
The dryer and its individual shutoff valve must be
disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of 1/2 psig (3.5 kPa).
Pipe joint compounds that resist the action of natural gas and
L.P. gas must be used.
Test all connections for leaks by brushing on a soapy water
solution (liquid detergent works well).
Warning
Never test for leaks with a flame!!!
Note
A water column test pressure of 3.5 inches (8.7 mb)
for natural gas and 10.5 inches (26.1 mb) for L.P.
dryers is required at the gas valve pressure tap of
each dryer for proper and safe operation.
The dryer must be isolated from the gas supply piping system
by closing its individual manual shutoff valve during any
pressure test of the gas supply system at test pressures equal
to or less than 1/2 psig (3.5 kPa).
Preparation For Operation/Start-Up ___
The following items should be checked before attempting to
operate the dryer:
• Read all “CAUTION,” “WARNING,” and “DIRECTION”
labels attached to the dryer.
• Check incoming supply voltage to be sure that it is the
same as indicated on the dryer data label.
• Gas Models – check to ensure that the dryer is connected
to the type of heat/gas indicated on the dryer data label.
• Gas and Electric Models – the sail switch damper
assembly was installed and adjusted at the factory prior
to shipping. However, each sail switch adjustment must
be checked to ensure that this important safety control is
functioning.
• Check bolts, nuts, screws, terminals, and fittings for
tightness.
• Gas Models – be sure that all gas shutoff valves are in
the open position.
• Check that the back guard panel and the electrical box
cover have been replaced.
• Check the lint drawer/tray to ensure that it is closed and
secured in place.
• Rotate the basket (tumbler/drum) by hand to be sure it
moves freely.
• Check terminals and fittings for security.
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.
Turn on electric power to the dryer.
Refer to the Operating Instructions for starting your particular
model dryer.
Gas Models Only
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.
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
Make a complete operational check of all safety related
circuits:
• Door Switch(es)
• Hi-Limit Thermostats
• Cycling Thermostat
• Gas And Electric Models Only – Sail Switch
Make a complete operational check of all operating controls.
Note
If computer program changes are required, refer to
the computer programming section of the manual
supplied with the dryer.
The dryer should be operated through one (1) complete cycle
to ensure that all components are functioning properly.
Preoperational Instructions ____________
Coin Models
Microprocessor Controller (Computer)
When the microprocessor controller (computer) is in the ready
state, the liquid crystal display (L.C.D.) screen will display
“Ready, Insert $XX.XX (amount) to Start”.
Insert coin(s). Once the correct “Amount to Start” has been
inserted, the L.C.D. will display “Select Temperature”.
Select temperature by pressing “HI,” “MED,” or “LO.” The
cycle will start and the L.C.D. will display the Dry Cycle selected
and the remaining time.
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