American Dryer Corp. MLG-460 - Manual (Page 71)

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• If no voltage is measured;
• Start a drying cycle, and monitor the voltages on TB1-23 and 9.
• If a voltage is present during drying start-up, the switch is functioning.
• If a voltage is not present while the dryer is started, check:
• Air Switch Adjustment.
• Switch.
• Circuitry (dryer Main Wiring Diagram and dryer Solenoid Junction Box Wiring Diagram).
3b) To check the electrical actuating of the pilot gas valve.
• Shut the main gas valve to the dryer.
• Open the disconnect block on TB1-63, for circuit testing. With control voltage “ON”, apply a
100 VAC line to TB1-63. THE PILOT GAS VALVE SOLENOID SHOULD ACTIVATE.
• If the solenoid does not cycle check circuitry; dryer Main Wiring Diagram, and dryer
Solenoid Junction Box Wiring Diagram.
• Check gas valve solenoid.
• Retest.
• With the main gas valve OPEN, close disconnect block on TB1-63 and Measure for 110 VAC on
TB1-63 and TB1-9 on the Main Electrical Panel during a drying cycle start-up.
• If a 110 VAC is present during start-up, burner pilot output circuit is OK.
• If a 110 VAC is not present;
• Check circuitry; refer to dryer Main Panel Wiring Diagram and dryer Solenoid Junction
Box Wiring Diagram).
• Refer to Section VI, Part D, Gas Burner and Ignition System on page 37 thru page 45.
4b) To check the electrical actuation of the Ignition Transformer;
• Shut the main gas valve to the dryer.
• Open the disconnect block on TB1-65, for circuit testing with control voltage “ON”, apply a
110 VAC line to TB1-65 “output” ARCHING SHOULD OCCUR AT THE SPARK IGNITER
IN THE BURNER ASSEMBLY.
• If there is arcing, close disconnect on TB1-65.