Cause
- Discharge temperature exceeds 135 C (275 F) for 10 minutes within the last hour.
| Components | Troubleshooting | Corrective actions |
|---|---|---|
| Restrictions in the refrigeration system. |
Ensure the Discharge Service Valve is fully open. | Open the Discharge Service Valve as needed. |
| Check the unit for air flow restrictions. | Clean or remove any debris from coils. | |
| Non-condensables in the refrigeration system. | With the unit off allow system to stabilize to ambient temperature. Check system pressure against PT Chart for 134a, refer to Table 6−4. | Correct as required, refer to Refrigerant Charge Section 6.7.1. |
| Additional Alarms such as AL16, AL24. | Check compressor operation. | If the alarm persists, it may indicate a failing compressor, replace the compressor, refer to COMPRESSOR Service Section 6.8. |
