American Dryer Corp. AD-100 - Manual (Page 9)

OPERATIONAL SEQUENCE MODEL ADE-100
Same as ADG-100
OPERATION
Depressing the "Enter/Start" button as a final entry of the prestart condition,
forwards a command signal on the P.C. board. This permits the motor relay con­
tactors to be energized and starts the motors. At the same time, a signal is
also sent energizing the coil on the heat circuit relay. The air flow switch
closes soon after the blower motor is started and the coil of the oven contactors
are energized to supply power to the oven elements.
When the temperature at the temperature transducer has risen to the cutoff
temperature corresponding to the heat valve entered during the prestart, the
heat circuit relay on the control panel opens, the oven contactor coils are de­
energized and the oven contactors open to shut off power to the oven elements.
After 15 seconds, or approximately lOop, the oven contactor coils are re-energized
and power is returned to the oven elements. This cycle continues until the drying
time selected or the level of dryness selected has expired.
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 P.C. mounted motor relay is de-energized
thus de-energizing the motor contactor relay. 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 the display
and return "FILL” or F_D_. If the door is opened during the cycle, the machine
will turn off completely. The cycle may be continued by closing the door and
re-pushing the "Enter/Start" button.
The motor is protected by an internal overload thermostat. If the motor
overheats, it will stop. The power to the oven will be shut off within a few
seconds when the air switch opens. The dryer can be restarted after the over­
load motor has sufficiently cooled. If the air switch fails to open, the high
limit thermostat will be heated by the elements and open to de-energize the
oven contactor coils and shut off power to the elements.
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 relays will become de­
energized and shut power to the gas valve and motor relay. Should this system
fail, the manual reset thermostat will open when its higher temperature is
reached. It will remain open until manually reset.
PRESTART CONDITIONS.
7-"3