American Dryer Corp AD-95 service manual Phase 6 OPL System Diagnostics

SECTION VII

PHASE 6 OPL SYSTEM DIAGNOSTICS

IMPORTANT: You must disconnect and lock out electric, 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 (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. display of certain failure codes, along with indicators both in L.E.D. display and at the output of each relay (and door switch circuit) to easily identify failures.

A.DIAGNOSTIC (L.E.D. 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 AIR FLOW- If the sail switch opens during cycle operation the display will read "No AIR FLOW" 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. Upon failure the machine will shut down and display "No AIR FLOW" 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. 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 temperature if the tumbler 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. Upon failure the machine will shut down and display "dRUM SAFETY FAIL" with an audio indication.

5.No HEAT- This routine monitors the burner ignition. If the burner mis-ignites (does not light) the HSI (hot surface ignition) module will check to see of the microprocessor program has any retries left. The standard retry count is two (2). If the module notices that there are retries left it will purge for one (1) minute then try to ignite the burner again. The HSI module will try this for a total of three (3) times or until there are no retries left. If the burner does not ignite after three attempts the L.E.D. display will display the error code "no heat" with an audio indication. When this occurs the machine will run with no heat for three (3) minutes or until the temperature drops below 100º F.

IMPORTANT: For other countries, such as Australia, the retry count may not apply due to local approvals.

6.bURNER CONTROL FAIL- This routine monitors the ignition control's gas valve output response. If the valve output signal is not present from the ignition control within the valve time limits the Phase 6 microprocessor controller (computer) determines the ignition control has failed. If this occurs when the cycle is active the machine will display "bURNER CONTROL FAIL." If the tumbler temperature is above 100º F the machine will continue to display "bURNER CONTROL FAIL." The machine will run with no heat for three (3) minutes or until the temperature drops below 100º F. If the tumbler temperature is below 100º F upon failure the machine will shut down and display "bURNER CONTROL FAIL" with an audio indication.

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