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When a “HEATER FAULT” occurs after the first twenty-five (25) seconds of the drying cycle, a “CLEAR/
STOP” will be sent to the Phase 5 Microprocessor Controller (computer), a “FILL” message will be displayed on
the Phase 5 Microprocessor Controller’s (computer’s) display, and both the “HEATER FAULT”
reset push-
button and the “END OF CYCLE" light will flash.
NOTE: If the “HEATER FAULT Reset Push-Button” is pressed any time during the PLC
(Programmable Logic Controller) controlled cool down cycle, the machine will come to a stop
since the machine is being attended to by a qualified operator.
“HEATER FAULT” occurs during the following conditions:
Front and/or rear or both air flow switches are in the closed position at the start of a drying cycle.
IMPORTANT: At the start of a drying cycle, the tumbler will begin to turn and a few seconds there-
after, the “FAN “ signal will be asserted.
IF BOTH AIR FLOW SWITCHES ARE NOT OPEN AT THIS TIME THE
BLOWER WILL NOT START and A “HEATER FAULT” WILL OCCUR.
Both HEATER FAULT Indicators” will flash and the machine will come to a complete
halt/stop until the “HEATER FAULT" reset push-button is pressed.
ONE or BOTH BURNERS DO NOT IGNITE
The dryer has two (2) burner boxes. Each burner box has its own Gas Valve, Spark Ignitor/Flame-Probe
Assembly, and DSI (Direct Spark Ignition) Module.
DSI (Direct Spark Ignition) Module
When the dryer calls for heat, and ALL dryer safety switches are satisfied, a 24 VAC control signal is supplied
to both DSI (Direct Spark Ignition) Modules. The DSI Module L.E.D. (light emitting diode) indicators will light
“red” for approximately 1.5-seconds of pre-purge, the L.E.D. indicators will light “green”. Each DSI Module
will energize its’ respective gas valve and provide an 8-second spark to its’ Spark Ignitor/Flame-Probe Assembly.
The gas in both burner boxes should ignite. If ignition does not occur in one or both burners after 8-seconds,
the flame will not be sensed by the Spark Ignitor/Flame-Probe Assembly and the DSI Module will go into the
“LOCK-OUT” mode lighting the L.E.D. (light emitting diode) indicator(s) “red” continuously. THERE ARE
NO IGNITION RETRIES BY THE DSI MODULE. Stop the dryer at this point and restart another drying
cycle. It may take several restarts to clear the gas supply piping of air.
NOTE: “HEATER FAULT” will occur during the initial set up of the machine, indicating that the burners
are not lighting due to air in the gas line.
GAS PRESSURE
The natural gas pressure supplied to the dryer must be between 6-inches and 12-inches of W.C. (water column)
pressure. If the supply pressure is above 12-inches water column than an external regulator must be installed to
reduce the gas supply pressure to between 6-inches and 12-inches of water column.
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