American Dryer Corp. AD-100 - Manual (Page 8)

When the temperature at the temperature transducer has risen to the cut off
temperature corresponding to the heat value entered during prestart, the gas
valve solenoid is de-energized, the valve closes, and the flame is extinguished.
After 15 seconds, the gas valve solenoid is re-energized and ignition is reestab­
lished by the glo-bar system. This cycle continues until the programmed drying
time has expired. This will then de-energize the P.C. mounted gas valve solenoid
and shuts off gas flow to the burner. The motor relay(s) remain energized allow­
ing the blower and tumbler to rotate without heat.
On the operating panel, the LED display shows the dryer has entered the
cooling cycle, and will continue to run for the duration of cooling time entered
in the prestart condition, or approximately 5 minutes in the automatic mode.
When the cooling time has expired, the motor relay(s) are de-energized.
The display on the operators panel shows "CCOO" (Cycle Complete - Zero Time
Remaining).
Opening the door at the end of the cycle will remove "CCOO" from display and
"FILL" or F_D_ will return. If the door is opened during the cycle, the machine
will turn off completely. The cycle may be continued by closing the door and
pressing the "ENTER/START" button.
The motors are protected by an internal overload thermostat. If the blower
motor overheats, it will stop. The gas flame will be extinguished within a few
seconds when the air switch opens. If the air flow switch fails to open, the
high limit thermostat will be heated by the standing burner flame and open to
de-energize the gas valve solenoid, and shut off the gas flow to the burner.
The temperature transducer is protected against failure by the micro­
computer system. Should the transducer fail, be removed from its holder, or
be subject to short or broken wire, the P. C. mounted relay will become de­
energized and shut power to the gas valve and motor relays. Should this system
fail, the manual reset thermostat will open when its higher temperature (approx.
225°) is reached. It will remain open until manually reset.
7-2