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Refer to the system ladder diagram for HEAT signal information. There are several safety devices that must
be satisfied prior to ignition. Any one of these safety devices can cause
NO IGNITION, therefore a
BURNER FAULT...i.e., FRONT AIRFLOW SWITCH
REAR AIRFLOW SWITCH
EXHAUST MANUAL RESET HI-LIMIT SWITCH
FRONT BURNER MANUAL RESET HI-LIMIT SWITCH
REAR BURNER MANUAL RESET HI-LIMIT SWITCH
DEFECTIVE ELECTRICAL HEAT CIRCUIT
ONE BURNER WILL NOT IGNITE AT THE BEGINNING OF A CYCLE
This condition can be caused by the following:
DEFECTIVE DSI (Direct Spark Ignition) MODULE
DEFECTIVE SPARK IGNITOR/FLAME-PROBE ASSEMBLY
DEFECTIVE GAS VALVE
INSUFFICIENT GAS PRESSURE
DEFECTIVE ELECTRICAL HEAT CIRCUIT
Refer to the ladder diagram and the schematics provided with this machine for reference to the above listed
information.
ONE BURNER WILL NOT IGNITE DURING A DRYING CYCLE
This condition can be caused by the following:
DEFECTIVE DSI (Direct Spark Ignition) MODULE
DEFECTIVE SPARK IGNITOR/FLAME-PROBE ASSEMBLY
DEFECTIVE GAS VALVE
DEFECTIVE ELECTRICAL HEAT CIRCUIT
LOSS OF GAS PRESSURE
Refer to the ladder diagram and the schematics provided with this machine for reference to the above listed
information.
CONTROL POWER (Indicator/Control Power On Push-Button)
This GREEN LIGHTED Push-Button is for enabling the 24 VAC control voltage to the control circuits of
the machine. This push-button indicator must be ON for the system to load or dry material.
Refer to the ladder diagram included with this ML-410 for the function of this push-button in the 24 VAC
control voltage latching control circuit.
CONTROL POWER (Off Push-Button)
This RED NON-LIGHTED Push-Button is for disabling the 24 VAC control voltage to the control circuits
of the machine.
Refer to the ladder diagram included with this ML-410 for the function of this push-button in the 24 VAC
control voltage latching control circuit.