Carrier AquaEdge 19XR Controls Operation And Troubleshooting page 35
Two-stage high-efficiency semi-hermetic centrifugal liquid chillers with pic 5 controls
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ALARM
ALARM TEXT
CODE
DESCRIPTION
(ALARMRST)
ALM-218 Sensor Fault —
Alm-218
Diffuser Pressure
ALM-219 Sensor Fault —
Alm-219
Oil Sump Pressure
ALM-220 Sensor Fault —
Alm-220
Oil Supply Pressure
ALM-230 Prestart
Alm-230
Failure — High Bearing
Temperature
ALM-231 Prestart
Alm-231
Failure — High Motor
Temperature
ALM-232 Prestart
Alm-232
Failure — High Discharge
Temperature
ALM-233 Prestart
Alm-233
Failure — Low Refrigerant
Temperature
Table 17 — PIC 5 Alarm Codes (cont)
RESET TYPE
PRESSURE TRANSDUCER FAULTS (CONT)
Automatic if the voltage measured by
the sensor returns to normal
Automatic if the voltage measured by
the sensor returns to normal
Automatic if the voltage measured by
the sensor returns to normal
PRESTART FAILURES
Manual
Manual
Manual
Manual
35
ACTION TAKEN
POSSIBLE CAUSE
BY CONTROL
Check diffuser pressure transducer
wiring.
Confirm that 5 v reference signal is
available between IOB connector.
Check for disconnected, grounded, or
Unit shuts down
shorted wiring.
Check for condensation in transducer
connector.
Check SW2 dip switch in IOB for the
channel configuration.
Check oil sump pressure transducer wir-
ing.
Confirm that 5 v reference signal is
available between IOB connector.
Unit shuts down
Check for disconnected, grounded, or
shorted wiring.
Check for condensation in transducer.
Check SW2 dip switch in IOB for the
channel configuration.
Check oil supply pressure transducer
wiring.
Confirm that 5 v reference signal is
available between IOB connectors.
Check for disconnected, grounded, or
Unit shuts down
shorted wiring.
Check for condensation in transducer
connector.
Check SW2 dip switch in IOB for the
channel configuration.
Check Comp Bearing Temp in Tem-
perature screen.
Check oil heater and oil cooler for
Unit shuts down.
proper operation.
Compressor is
Check for low oil level, partially closed
not allowed to
oil supply valves, clogged oil filters.
start.
Check the compressor bearing tempera-
ture sensor wiring and accuracy to IOB
connector.
Check Comp Bearing Temp Alert setting.
Check Comp Motor Wind Temp in Tem-
perature screen.
Check motor temperature sensor for wir-
Unit shuts down.
ing and accuracy to IOB connector.
Compressor is
Check motor cooling line and isolation
not allowed to
valves for proper operation or restric-
start.
tions, check refrigerant filter/drier.
Check for excessive starts within a short
time span.
Check Comp Motor Temp Override setting.
Check Comp Discharge Temp in Tem-
perature screen.
Unit shuts down.
Allow compressor discharge tempera-
Compressor is
ture sensor to cool.
not allowed to
Check compressor discharge tempera-
start.
ture sensor wiring to IOB connector.
Check for excessive starts.
Check Comp Discharge Alert setting.
Check Evaporator Pressure, Evap Sat
Refrig Temp, and Evap Refrig Liquid
Temp in Temperature screen.
Check Evaporator Pressure transducer
and Evaporator Refrigerant Liquid Tem-
Unit shuts down.
perature sensor wiring and accuracy to
Compressor is
IOB connector.
not allowed to
Check for low chilled water supply tem-
start.
peratures.
Check refrigerant charge.
Check REFRIG OVERRIDE DELTA T
and EVAP REFRIG TRIPPOINT in Con-
figuration screen.
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