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15
Troubleshooting _______________________
The information provided will help isolate the most probable
components associated with the difficulty described. The
experienced technician realizes, however, that a loose
connection or broken or shorted wire may be at fault where
electrical components are concerned...not necessarily the
suspect component itself.
Electrical parts should always be checked for failure before
being returned to the factory.
The information provided should not be construed as a device
for use by an untrained person in making repairs. Only properly
licensed technicians should service the equipment.
Observe all safety precautions displayed on the equipment or
specified in this manual while making repairs.
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 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 L.E.D. display of certain failure messages, along with
L.E.D. indicators on the I/O board on the back panel of the
front right control door.
Diagnostic (L.E.D. Display) Fault Messages
BURNER CONTROL FAULT
– This routine monitors the gas
return valve signal and compares it with the 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
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 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 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 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.
FLAME FAULT
– After the Phase 7 non-coin microprocessor
controller (computer) has verified that the gas valve signal was
present throughout the DSI purge time and the DSI proof time,
the Phase 7 non-coin microprocessor controller (computer) will
continue to monitor the gas valve return signal. In the event
that the gas valve return signal is lost anytime after the DSI
proof time, the Phase 7 non-coin microprocessor controller
(computer) will turn off the heat output and increase a counter.
Once this fault condition occurs five (5) consecutive times, the
Phase 7 non-coin microprocessor controller (computer) will
interrupt the cycle, display “Flame Fault” condition, and go into
a Fault Mode with a brief audio indication. If the tumbler
temperature is above 100° F (38° C), the Phase 7 non-coin
microprocessor controller (computer) will continue to display
“Flame 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 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.
BURNER PURGE FAULT
– If the Phase 7 non-coin
microprocessor controller (computer) detects the presence of
the gas return signal before sending the heat signal out, the
Phase 7 non-coin microprocessor controller (computer) will
trigger a “Burner Purge Fault” condition and will go into Fault
Mode with a brief audio indication. The dryer will run with no
heat for 3 minutes or until the temperature drops below
100° F (38° C). Once the 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.
