American Dryer Corp ML-170, ML-145 service manual Phase 6 OPL System Diagnostics

SECTION VIII

PHASE 6 OPL SYSTEM DIAGNOSTICS

IMPORTANT: YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS SUPPLY or THE 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 door, microprocessor temperature sensor, heat and motor circuits are monitored. The Phase 6 OPL microprocessor controller (computer) will inform the user, via the L.E.D. (light emitting diode) display of certain failure codes, along with indicators both in L.E.D. (light emitting diode) display and at the output of each relay (and door switch circuit) to easily identify failures.

A. DIAGNOSTIC (L.E.D. [light emitting diode] DISPLAY) FAILURE CODES

1.SAIL SWITCH FAIL - This routine will prevent start up on the machine unless the sail switch is in the correct position. If the sail switch is closed prior to start up the display will read “SAIL SWITCH FAIL” along with an audio indication.

2.No AIRFLOW- If the sail switch opens during cycle operation the display will read “No AIRFLOW” along with an audio indication. The machine will continue to run with no heat for three (3) minutes or until the temperature drops below 100º F (38º C). Upon failure the machine will shut down and display “No AIRFLOW” with an audio indication.

3.bURNER SAFETY FAIL - Routine monitors the temperature above the burner. If the burner hi-limit switch opens the display will read “bURNER SAFETY FAIL.” The machine will run with no heat for three (3) minutes or until the temperature drops below 100º F (38º C). Upon failure the machine will shut down and display “bURNER SAFETY FAIL” with an audio indication.

4.dRUM SAFETY FAIL - This routine monitors the tumbler (basket) temperature if the tumbler (basket) hi-limit switch opens prior or during the cycle while the heat was on the machine will display “dRUM SAFETY FAIL.” The machine will continue to run with no heat for three (3) minutes or until the temperature drops below 100º F (38º C). Upon failure the machine will shut down and display “dRUM SAFETY FAIL” with an audio indication.

5.NoHEAT - This routine monitors the gas valve response. If the valve output is discontinued by the ignition control while the heat output cycle is active the machine will display “NoHEAT” the machine will run with no heat for three (3) minutes or until the temperature drops below 100º F (38º C). If the tumbler (basket) temperature is below 100º F (38º C) upon failure the machine will shut down and display “NoHEAT” with an audio indication.

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