Carrier PrimeLINE 69NT40-561-200 Operation And Service Manual page 78

AL17 COMPRESSOR PRESSURE DELTA FAULT
Component
AL18 DISCHARGE PRESSURE HIGH
Cause: Discharge pressure is over the maximum for 10 minutes within the last hour.
Component
Component
Component
Component
Component
Component
AL19 DISCHARGE TEMPERATURE HIGH
Cause: Discharge temperature exceeds 135°C (275°F) for 10 minutes within the last hour.
Component
T-362
Troubleshooting Confirm accurate SPT pressure readings. Refer to Manifold Gauge
Set Section
Corrective Action Replace SPT if defective.
Monitor Unit
Troubleshooting Alarm is display only; the alarm may clear itself during operation.
Corrective Action If alarm remains active or is repetitive, replace compressor at next
available opportunity.
Restrictions in the refrigeration system.
Troubleshooting Ensure Liquid Line Service Valve is fully open.
Corrective Action Open Liquid Line Service Valve as needed.
Filter Drier
Troubleshooting Check the filter drier. If it is iced up or very cold, it indicates that the
filter drier needs replacement.
Corrective Action Replace the filter drier if needed. Refer to Filter Drier Service
tion
Condenser Fan
Troubleshooting Check Condenser Fan for proper operation.
Corrective Action Correct as required.
Discharge Pressure Transducer (DPT)
Troubleshooting Confirm accurate DPT pressure readings. Refer to Manifold Gauge
Set Section
Corrective Action Replace DPT if defective.
Non-condensables in the refrigeration system.
Troubleshooting With the unit off, allow system to stabilize to ambient temperature.
Check system pressure against Pressure Temperature Chart. Refer
to Table
Corrective Action Correct as required. Refer to Refrigerant Charge
Refrigerant
Troubleshooting Check refrigerant level.
Corrective Action Correct as required. Refer to Refrigerant Charge
Restrictions in the refrigeration system.
Troubleshooting Ensure the Discharge Service Valve is fully open.
Corrective Action Open the Discharge Service Valve as needed.
Troubleshooting Check the unit for air flow restrictions.
Corrective Action Clean or remove any debris from coils.
7.2.
7.14.
7.2.
7–4, Table 7–5.
4–40
Sec-
Section 7.7.1.
Section 7.7.1.