Carrier AquaEdge 19XR Controls Operation And Troubleshooting page 36

ALARM
ALARM TEXT
CODE
DESCRIPTION
(ALARMRST)
ALM-234 Prestart Failure
Alm-234
— Low Line Voltage
ALM-235 Prestart Failure
Alm-235
— High Line Voltage
ALM-236 Guide Vane 1 —
Alm-236 Calibration Not Completed Manual
ALM-234 Prestart Failure
Alm-237
— No Power Supply
ALM-239 Envelop Control
Alm-239 Valve Calibration Not
Completed
ALM-250 Protective Limit
Alm-250 — Oil Pressure Difference
Failure
ALM-251 Protective Limit
Alm-251 — Low Chilled Water Flow Manual
ALM-252 Protective Limit
Alm-252 — Low Condenser Water
Flow
Table 17 — PIC 5 Alarm Codes (cont)
RESET TYPE
PRESTART FAILURES (CONT)
Manual
Manual
Manual
Manual
PROTECTIVE LIMITS
Manual
Manual
36
ACTION TAKEN
POSSIBLE CAUSE
BY CONTROL
Check ACTUAL LINE VOLTAGE.
Check UNDERVOLTAGE THRESHOLD
in ISM_CONF screen.
Unit shuts down.
Check voltage supply.
Compressor is
Check wiring to ISM J3-L1, J3-L2, and
not allowed to
J3-L3.
start.
Check voltage transformers and switch
gear.
Consult power utility if voltage is low.
Check ACTUAL LINE VOLTAGE.
Check OVERVOLTAGE THRESHOLD
Unit shuts down.
in ISM_CONF screen.
Compressor is
Check voltage supply.
not allowed to
Check voltage transformers and switch
start.
gear.
Consult power utility if voltage is high.
Perform Guide Vane Calibration in
Unit shuts down.
Quick Test screen.
Compressor is
Check guide vane actuator feedback
not allowed to
potentiometer and wiring to IOB
start.
connector.
Unit shuts down. If WATER VERIFICATION TIME has
Compressor is passed after REQUEST TO START had
not allowed to been sent, there is still no PERMISSION
start. TO START received
Unit shuts down. EC valve calibration failed during control
Compressor is test mode or prestart check.
not allowed to
start.
Check oil pump.
Unit shuts down. Check oil filter.
Check oil pump wiring.
Perform Chilled Water pump test in
Quick Test screen.
Check evaporator refrigerant liquid tem-
perature and leaving chilled water tem-
perature sensor accuracy and wiring to
IOB.
Check chilled water valves, pumps, and
strainers.
Unit shuts down. 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 trans-
ducer 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 tempera-
ture sensor accuracy and wiring.
Check condenser water valves and
strainers.
Check COND PRESS OVERRIDE,
Unit shuts down.
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 trans-
ducer calibration and wiring to IOB.
Check for 5.0 v reference voltage
between IOB connectors.