American Dryer Corp. AD-100 - Manual (Page 10)

Same as ADG-100
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
energizing the coil of the heat circuit relay, and the coil on the steam valve
solenoid is energized to open the valve to let steam flow to the heat exchangers.
When temperature at the temperature transducer has risen to the cut off
temperature corresponding to the heat valve entered during the prestart, the
heat circuit relay on the control panel opens, the steam valve closes and shuts
off steam to the heat exchangers. After 15 seconds, or approximately lOop, the
steam valve is energized to open the valve to let the steam flow to the heat
exchanger. 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 the 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 the dis­
play and return "FILL" of 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 pressing the "Enter/Start" button.
The motors are protected by an internal overload thermostat. If the
motor(s) overheat they will stop. The steam valve remains open, but without
air circulation, the heat is not passed to the load. The dryer can be re­
started after the motor has sufficiently cooled.
The temperature transducer is protected against failure by the microcomputer
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 relays. Should this system fail, the
manual reset theimostat will open when its higher temperature is reached. It
will remain open until manually reset.
OPERATIONAL SEQUENCE mOEL AD8-100
PRESTART CONDITIONS.
7-4