Carrier VECTOR 1550 Series - Page 190

62-61753-21
7-74
Alarm
NO.
Steps
ALARM / CAUSE
CORRECTIVE ACTION
P174 CHECK LOW SPEED RPM
 TRIGGER-ON speed was not within expected range during test or speed did not return to expected
range following transition back from high speed test.
 UNIT CONTROL: Pretrip will fail and display "PRETRIP FAIL AND COMPLETED".
 RESET CONDITION: Auto Reset if Pretrip is started again or alarm may be manually reset via key-
pad or by turning the unit off then back on again.
1
Check microprocessor speed control and engine - refer to alarm 37
P175 CHECK HIGH SPEED RPM
 TRIGGER-ON speed was not within expected range during test.
 UNIT CONTROL: Pretrip will fail and display "PRETRIP FAIL AND COMPLETED".
 RESET CONDITION: Auto Reset if Pretrip is started again or alarm may be manually reset via key-
pad or by turning the unit off then back on again.
1
Check microprocessor speed control and engine - refer to alarm 38
P177 CHECK EVAPORATOR SUPERHEAT
 TRIGGER-ON: Superheat control by the EVXV was not within the expected range during test.
 UNIT CONTROL: Pretrip will fail and display "PRETRIP FAIL AND COMPLETED".
 RESET CONDITION: Auto Reset if Pretrip is started again or alarm may be manually reset via key-
pad or by turning the unit off then back on again.
1
Perform diagnostic testing and service of valve as required - refer to Section 8.5.4
P180 CHECK SUCTION MODULATING VALVE
 TRIGGER-ON: Suction pressure control by the valve was not within the expected range during test.
 UNIT CONTROL: Pretrip will fail and display "PRETRIP FAIL AND COMPLETED".
 RESET CONDITION: Auto Reset if Pretrip is started again or alarm may be manually reset via key-
pad or by turning the unit off then back on again.
1
Perform diagnostic testing and service of valve as required - refer to Section 8.6.7
P186 CHECK EVAPORATOR OUTLET TEMPERATURE
 TRIGGER-ON: Sensor reading was not within the expected range during test.
 UNIT CONTROL: Pretrip will fail and display "PRETRIP FAIL AND COMPLETED".
 RESET CONDITION: Auto Reset if Pretrip is started again, or alarm may be manually reset via key-
pad or by turning the unit off, then back on again.
1
Check Sensor - refer to alarm 131