Carrier PrimeLINE 69NT40-561-200 Operation And Service Manual page 76

AL08 HIGH COMPRESSOR PRESSURE RATIO
Cause: Controller detects discharge pressure to suction pressure ratio is too high.
The controller will attempt to correct the situation by restarting the compressor.
Component
AL09 O SENSOR FAILURE
2
Cause: Triggered anytime the O
signal was detected.
Troubleshooting Check Cd44 and scroll down to 02V. The O
AL10 CO2 SENSOR FAILURE
Cause: Triggered anytime the CO
signal was detected.
Component
AL14 PHASE SEQUENCE DETECT FAULT
Cause: Controller is unable to determine the correct phase relationship.
Component
Component
T-362
Discharge Pressure Transducer (DPT)
Troubleshooting Confirm accurate DPT pressure readings. Refer to Manifold Gauge
Set Section
Corrective Action Replace DPT if defective.
sensor reading is outside of the normal operation range, after an initial
2
Component O Sensor, O
2
played in millivolts (130mV to 4100mV).
Switch equipped: If voltage is not present at Cd44 and a sensor switch
module is installed, check for O
the sensor switch module, connecting ground of meter to TP9. If the volt-
age is in the 130mV to 4.1V range, directly wire the black wire to KD04.
This may cause an AL07 depending on O
operate normally. If no voltage on the black wire, proceed to next step.
Check wiring (refer to schematic), and correct if found mis-wired.
If O sensor is available, remove the upper fresh air panel and evaporator
2
motor and replace the sensor. If after replacing sensor AL09 continues, re-
place amplifier.
If parts are not available, turn XtendFRESH option off (Cd43) and open the
Manual Fresh Air Vent.
sensor reading is outside of the normal operation range, after an initial
2
CO
2
Troubleshooting Check the voltage at MC5 to the ground pin on TP9. (1 - 4.7 vdc).
Check wiring (refer to schematic), and correct if found mis-wired.
If part is available, remove upper fresh air panel and evaporator mo-
tor; replace sensor. If no part is available, take no action and service
at next PTI. XtendFRESH will continuously run the scrubber. O2 lev-
el will be controlled with the opening and closing of the fresh air vents
as required.
Corrective Action The alarm is triggered off when voltage is within operating range.
N/A
Troubleshooting Power cycle the unit.
Corrective Action Resetting the unit may correct problem, monitor the unit.
Wiring
7.2.
Amplifier, Sensor Switch Module (if equipped)
2
voltage on the black wire connected to
2
Sensor.
4–38
sensor output will be dis-
2
reading but XtendFRESH will
2