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SECTION X
PHASE 7 NON-COIN MICROPROCESSOR CONTROLLER
(COMPUTER) SYSTEM DIAGNOSTICS
IMPORTANT: YOU MUST DISCONNECT AND LOCK OUT THE ELECTRIC SUPPLY
AND THE GAS OR STEAM SUPPLY BEFORE ANY COVERS OR
GUARDS ARE REMOVED FROM THE MACHINE, TO ALLOW ACCESS
FOR CLEANING, ADJUSTING, INSTALLATION, OR TESTING OF ANY
EQUIPMENT PER OSHA (Occupational Safety and Health Administration)
STANDARDS.
ALL major circuits, including the door, the Phase 7 non-coin microprocessor controller (computer) temperature
sensor, and the heat and motor circuits are monitored. The Phase 7 non-coin microprocessor controller (computer)
will inform the user, via the light emitting diode (L.E.D.) display of certain failure messages, along with L.E.D.
indicators on the Input/Output (I/O) board on the back panel of the front right control door.
A. DIAGNOSTIC (L.E.D. DISPLAY) FAULT MESSAGES
BURNER CONTROL FAULT – This routine monitors the gas return valve signal and compares it with the
Direct Spark Ignition (DSI) purge time setting. If the gas return valve signal
does not turn on before the DSI
purge time expires, or if it turns on for less than 200 ms, the Phase 7 non-coin microprocessor controller (computer)
will turn off the heat output, increase a counter, and wait the interpurge time before reattempting to ignite the
burner. Once this fault condition occurs five (5) consecutive times, the Phase 7 non-coin microprocessor
controller (computer) will interrupt the cycle and will display “BURNER CONTROL FAULT” and will go into
a Fault Mode with a brief audio indication. If the basket (tumbler) temperature is above 100° F (38° C) at the
time of the failure, the Phase 7 non-coin microprocessor controller (computer) will continue to display “BURNER
CONTROL FAULT”, while the dryer cools by running with no heat for 3 minutes or until the temperature drops
below 100° F (38° C). If the basket (tumbler) temperature is below 100° F (38° C), or the 3 minutes expire, the
Phase 7 non-coin microprocessor controller (computer) will shut off
ALL outputs and will remain in Fault Mode
until the dryer is addressed.
IGNITION FAULT – After the Phase 7 non-coin microprocessor controller (computer) receives a gas valve
return for more than 200 ms signal within the DSI purge time, the Phase 7 non-coin microprocessor controller
(computer) will begin a DSI proof time. The Phase 7 non-coin microprocessor controller (computer) will
continue to recheck the gas valve return signal. If the signal is lost during the DSI proof time, the Phase 7
non-coin microprocessor controller (computer) will turn off the heat output and determine what the retry count
is set at. If the retry count is greater than zero, the Phase 7 non-coin microprocessor controller (computer) will
wait through the interpurge time and attempt to reignite the flame. If the failure condition occurs again, the
Phase 7 non-coin microprocessor controller (computer) will retry until the retry count has been satisfied. Once
the retry count has been satisfied, the Phase 7 non-coin microprocessor controller (computer) will interrupt the
cycle and display “Ignition Fault” condition and go into a Fault Mode with a brief audio indication. If the basket
(tumbler) temperature is above 100° F (38° C), the Phase 7 non-coin microprocessor controller (computer) will
continue to display “Ignition Fault”, while the dryer cools by running with no heat for 3 minutes or until the
temperature drops below 100° F (38° C). Once the basket (tumbler) temperature is below 100° F (38° C), or the
3 minutes expire, the Phase 7 non-coin microprocessor controller (computer) will shut off
ALL outputs and will
remain in Fault Mode until the dryer is addressed.