Shut Down Alarms

Problem

Possible cause

Solution

A8 Process Blower Pressure

If the process blower pres- sure switch opens (loss of pressure), it shuts down the dryer.

A24 Regen Blower Pressure

The regeneration blower pressure switch opens (loss of pressure) and the regeneration heater shuts down.

NOTE: The system may index one more time

after the alarm, then stop indexing.

A36 Control Communications Watchdog - The display board has lost communications

with the control board.

A38 Phase Error (Phase Option, STD, on MDC's) - One of the three power wires is connected wrong.

A39 EEProm Write Error

The tubing going to the pressure switch is cut or has come loose.

The process blower overload has tripped.

The blower motor starter has failed

The tubing going to the pressure switch is cut or has come loose.

The blower motor relay has failed.

Plugs on wire harness between the display and control boards are loose.

Display board or Communications boards have failed.

One of the three power wires are out of phase.

Phase Detector Board has failed.

Internal Control board problem.

Check the tubing for cracks and make sure it is secure on the fittings.

Check the process blower overload. If it is tripped, check the process blower to make sure its not locked. Make sure the overload is set slightly above the full load current shown on the motor name- plate. Refer to your wiring diagram for proper settings.

Check the process blower motor starter.

Check the tubing for cracks and make sure it is secure on the fittings.

Check the regeneration blower motor relay.

Make sure plugs are tight on board connections.

Replace the boards.

Switch the position of two of the incom- ing lead power wires at the dryer.

Replace the Phase Detection Board.

Replace the Control board.

Troubleshooting

6

 

 

Tr o u b l e s h o o t i n g l 6 - 7

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Conair 15, 25, 50, 100 specifications Shut Down Alarms Problem Possible cause, Solution

50, 15, 100, 25 specifications

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