American Dryer Corp. ADS-464 II User Manual
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If anyone of the HI-LIMIT temperature SENSORS sense an over temperature condition. It will
open its control relay. (Refer to the ADS-464 ladder diagram for the effect of this relay.)
If a HI-TEMP FAULT message is displayed, open the main electrical enclosure, and notice
which channel has cycled. This will lead one in the direction of the fault.
HLS1 - MAXIMUM INTAKE TEMPERATURE
HLS2 - MAXIMUM EXHAUST TEMPERATURE
The HI-Temp controller channel that has a GREEN LED (light emitting diode) ON, indicates
the RTD that caused the message (HI-TEMP FAULT) to be displayed.
Let the dryer cool and verify that GREEN LEDs (light emitting diodes) resume scanning.
Reset the controller by pressing the RESET on the controller. This will verify that an over
temperature condition occurred and the controller is operational.
Go to 1 and check airflow.
If hi-limit controller does not reset, go to 3.
3) If either RTD (Resistive Temperature Device) 1 or 2 were to open or become disconnected, the
associated temperature channel, of the hi-temp controller located on the main electrical panel, will
sense the open and react by opening its respective control relay and never re-energize until the RTD
is replaced. Once HI-LIMIT controller problem has been isolated to particular device, and a RTD
temperature sensor is suspected:
Check the resistance of the RTD at its connector, located in the right hand cable through.
.
If 0 ohms (0W) is measured:
Check RTD (Resistive Temperature Device).
Check wiring to the RTD (refer to ADS-464 Main Panel Wiring Diagram).
Check wiring to the HI-LIMIT temperature controller (refer to ADS-464 Main Panel Wiring
Diagram).
If RTD measures in the range of 100 ohms (100W):
Check wiring to the HI-LIMIT temperature controller (refer to ADS-464 Main Panel Wiring
Diagram).
If wiring checks out:
Replace the HI-LIMIT temperature controller.
Retest.
4) If there is no display on the hi-temperature controller.
Check that main power is ON; front panel BLUE indicator.