Troubleshooting - Ingersoll Rand EH Serie Manual De Operador

PROBLEM
Elevated dew point
Excessive pressure drop in
dryer
Excessive back pressure in
regenerating tower (Above
5 PSIG).
Excessively high pressure at
the purge gage (Blower and
Heatless Modes)
Failure to Shift
(Switching Failure)
Failure to Shift
(Dryer fails to pressurize.)
Failure to Shift (Dryer fails to
depressurize.)
Heater High Temp. Alarm
(Heater runs continuously)
Heat High Temp. Alarm
(Loss of flow across heater)
NOTICE
The Heater High Temperature Alarm halts the Microprocessor Control
program. Prior to reinstating dryer, note the position of all valves. This
is critical in determining the possible cause of the alarm condition.

12.0 TROUBLESHOOTING

PROBABLE CAUSE
Insufficient purge rate / I
Inlet air/gas pressure below design condition.
Flow rate higher than design condition.
Inlet temperature above design condition.
Entrained water entering desiccant bed.
Desiccant contaminated by oil.
Excessive flow rate.
Inlet pressure below design condition.
Air is leaking across valve.
Improper calibration
No input power
Defective no-loss drain valve
No pilot air / Low pilot air pressure
Defective pressure switch
Faulty purge valve
Purge valve does not open. Purge valve stuck
in closed position.
Contactor stuck closed.
Defective thermocouple
Defective temperature control
Valve switching failure
EH Series Desiccant Dryer Models 150-8000
http://www.ingersollrandproducts.com
CORRECTIVE ACTION
Check purge flow settings.
Check purge piping for obstruction.
Clean purge piping and muffler.
Check pressure source.
Check flow rate and cause for increased demand.
Check aftercooler, clean and service as necessary.
Check air/moisture separator and pre-filter. Replace
dryer desiccant if necessary.
Install suitable pre-filter. Replace dryer desiccant.
Check flow rate and cause for increased air demand.
Check pressure source.
Check inlet valve. Verify inlet valve is closed to purging
tower (0 PSIG tower).
Check gauge against tower gauges when in switching
sequence. Replace gauge as required.
Check power input.
Check no-loss drain valve.
Check pilot air line. Check that control air line filter is
clean. Check regulator setpoint.
Check switch. Open pressure: > 65 psig; close pressure:
< 40 psig
Check purge valve and its no-loss drain valve.
Check that repressurization circuit is sending control
signal.
Check no-loss drain valve. Repair and replace if
necessary.
Replace contactor.
Replace thermocouple.
Replace temperature control.
Contact Ingersoll Rand Distributor / Factory
NOTICE
To reset the Heater High Temperature Alarm, reset the Microprocessor
Controller using the RESET button and manually reset the Heater High
Temperature safety in the control enclosure.
21