Carrier AquaEdge 19DV Controls Operation And Troubleshooting page 33

DESCRIPTION
ALARM CODE
OF ALARM TEXT
Prestart Failure -
ALM-231 High Motor
Temperature
Prestart Failure -
ALM-232 High Discharge
Temp
Prestart Failure -
ALM-233 Low Refrigerant
Temp
Prestart Failure -
ALM-234
Low Line Voltage
Prestart Failure -
ALM-235 High Line
Voltage
Guide Vane 1
ALM-236 Calibration Not
Completed
Prestart Failure –
ALM-237
No Power Supply
Guide Vane 2
ALM-238 Calibration Not
Completed
Envelope Control
ALM-239 Valve Calibration
Not Completed
Damper Valve
ALM-240 Calibration Not
Completed
Protective Limit -
Oil Pressure
ALM-250
Difference
Failure
Protective Limit -
ALM-251 Low Chilled
Water Flow
Protective Limit -
ALM-252 Low Condenser
Water Flow
Protective Limit -
ALM-253 High Discharge
Temp
Table 16 — PIC6 Alarm Codes* (cont)
ACTION TAKEN BY
RESET TYPE
THE CONTROL
Unit shuts down.
Manual
Alarm relay turns on.
Unit shuts down.
Manual
Alarm relay turns on.
Unit shuts down.
Manual
Alarm relay turns on.
Unit shuts down.
Manual
Alarm relay turns on.
Unit shuts down.
Manual
Alarm relay turns on.
Unit shuts down.
Manual
Alarm relay turns on.
Unit shuts down.
Manual
Alarm relay turns on.
Unit shuts down.
Manual
Alarm relay turns on.
Unit shuts down.
Manual
Alarm relay turns on.
Unit shuts down.
Manual
Alarm relay turns on.
Unit shuts down.
Manual
Alarm relay turns on.
Unit shuts down.
Manual
Alarm relay turns on.
Unit shuts down.
Manual
Alarm relay turns on.
Unit shuts down.
Manual
Alarm relay turns on.
POSSIBLE CAUSE
Check Comp Motor Wind Temp in Temperature screen.
Check motor temperature sensor for wiring and accuracy to IOB
connector.
Check motor cooling line and isolation valves for proper operation, or
restrictions, check refrigerant filter/drier.
Check for excessive starts within a short time span.
Check Comp Motor Temp Override setting.
Check Comp Discharge Temp in screen
Allow compressor discharge temperature sensor to cool.
Check compressor discharge temperature sensor wiring and accuracy
to IOB connector.
Check for excessive starts.
Check COMP DISCHARGE ALERT setting.
Check Evaporator Pressure, Evap Sat Refrig Temp, and Evap Refrig
Liquid Temp.
Check REFRIG OVERRIDE DELTA T and EVAP REFRIG TRIPPOINT
in configuration screen.
Check refrigerant charge.
Check for low chilled water supply temperatures.
Check Evaporator Pressure transducer and Evaporator Refrigerant
Liquid Temperature sensor wiring and accuracy.
Check ACTUAL LINE VOLTAGE.
Check UNDERVOLTAGE THRESHOLD in ISM_CONF screen.
Check voltage supply.
Check wiring to ISM J3-L1, J3-L2, and J3-L3.
Check voltage transformers and switch gear.
Consult power utility if voltage is low.
Check ACTUAL LINE VOLTAGE.
Check OVERVOLTAGE THRESHOLD in ISM_CONF screen.
Check voltage supply.
Check voltage transformers and switch gear.
Consult power utility if voltage is high.
Guide Vane 1 Calibration in Quick Calibration screen.
Check guide vane actuator feedback potentiometer and wiring to IOB
connector.
Check the Power Request Output and the Power Feedback input status.
Guide Vane 2 Calibration in Quick Calibration screen.
Check guide vane actuator feedback potentiometer and wiring to IOB
connector.
Envelope control valve Calibration in Quick Calibration screen.
Check EC valve feedback potentiometer and wiring to IOB connector.
Tested on control test mode or prestart check, if Damper calibration is
failed.
Check oil pump
Check oil filter
Check oil pump wiring
Perform Chilled Water pump test in Quick Test screen. Check Evap
Refrig Liquid Temp and Leaving CHILLED WATER temperature sensor
accuracy and wiring to IOB.
Check chilled water valves, pumps, and strainers.
Check EVAP REFRIG TRIPPOINT, EVAP APPROACH ALERT, EVAP
FLOW DELTA P CUTOUT, and WATER FLOW VERIFY TIME settings.
Check load resistors, optional water flow switches or water flow delta P
transducer calibration and wiring to IOB.
Check for 5.0 V reference voltage between IOB connectors.
Perform Condenser Water pump test in Quick Test screen. Check
CONDENSER PRESSURE transducer and LEAVING CONDENSER
WATER temperature sensor accuracy and wiring.
Check condenser water valves and strainers. Check COND PRESS
OVERRIDE, COND APPROACH ALERT, COND FLOW DELTA P
CUTOUT, and WATER FLOW VERIFY TIME settings.
Check load resistors, optional water flow switches or water flow delta P
transducer calibration and wiring to IOB. Check for 5.0 V reference
voltage between IOB connectors.
Check for closed compressor discharge isolation valve.
Check if chiller was operating in surge conditions.
Check COMP DISCHARGE TEMP sensor resistance or voltage drop.
Check for proper wiring to IOB connectors.
Check for proper condenser flow and temperature.
Check for fouled tubes, plugged water strainers, or non-condensable in
the condenser.
Check for COMP DISCHARGE TEMP > 220 deg F.
Check for proper inlet guide vane and optional diffuser actuator
operation.
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