American Dryer Corp. AD-100 - Manual (Page 7)

SECTION VII
OPERATIONAL SEQUENCE mCEL ADG-100
PRESTART CONDITIONS.
A.
B.
c .
Depress manual reset thermostat (Ulus. #5, page 9-7).
Close lint door, main door, and control door.
1. Auto only dryer - display shows F_D_.
a. Load fabric by depressing corresponding button (i.e. 1 thru 9).
b. Load dryness by pressing corresponding button (i. e. 1 (less dry)
to 9 (more dry) ).
c. Depress "Enter/Start" button.
2. Auto-Manual dryer - display shows fill.
Auto selected - see above.
Manual selected.
a. Load drying time by depressing corresponding buttons (i.e. 1 min.
thru 99 min.).
Depress "Enter/Start” button.
Load cooling time by depressing corresponding buttons (i.e. 1 min.
thru 99 min.).
Depress "Enter/Start" button.
Load fabric by depressing corresponding button (i.e. 1 thru 9).
Depress"Enter/Start" button.
b.
d.
e.
f.
OPERATION
Depressing the "Enter/Start" button as a final entry of the prestart condition,
forwards a command signal from the computer chip energizing the motor control
relay(s), and starts the motors. At the same time, a signal is also sent ener­
gizing the coil on the heat circuit relay. The valve is then energized after
the air-switch has been closed.
On the operating panel, the LED display shows that the dryer is operating
in the drying mode, and also the drying time entered. The air switch closes
soon after the motor is started. The glo-bar is ignited, and the primary valve
is opened. Gas does not flow because of the normally closed flame switch (I.R.
sensor switch) prevents the secondary valve from opening. In about 1 0 - 1 5
seconds the glo-bar is fully heated (from a "cold" 70°F. start). Its radiation
heats up the Bi-metallic flame switch, and the switch opens (25 - 40 seconds
later depending on its sensitivity and room temperature) permitting the gas to
flow through the secondary valve. The glo-bar is essentially extinguished, but
in this short period remains hot enough to ignite the gas. The gas flame radi­
ates enough heat to keep the I.R. flame switch open until the micro processor
heat circuit relay opens to shut off the gas.
When both the flame switch and heat circuit relay reclose, the secondary
valve closes and the ignition cycle is restarted. The temperature of the hot
air will continue to drop while either the heat circuit relay or the flame
switch remains open. After both are closed, the air temperature continues to
fall until the glo-bar is sufficiently reheated and radiates enough heat to
reopen the flame switch since the glo-bar and flame switch are much warmer than
they were at the start of the first ignition cycle, the time to recycle is re­
duced to 25-30 seconds total.
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