56 Compressor Temperature Too High MP4000

Description 

Compressor Temperature Too High 

• Shutdown Alarm 
• Compressor discharge line temperature is above 148 C (298 F). Compressor stopped until discharge line temperature decreases to normal. 
• Indicates: 
• Air in refrigeration system. 
• Low refrigerant charge. 
• Defective compressor. 
• Defective vapor injection. 

Corrective Action 

• Operate unit on Cool and check discharge and suction pressure gauge readings. 
• Enter Manual Function Test menu and test (operate) Vapor Injection Valve to determine if valve opens (energizes). 
• Check compressor discharge sensor resistance. Resistance must be approx. 86,000 ohms at 25 C (77 F). 
• Check discharge line temperature with a separate electronic thermometer and compare to “HIGH PR TEMP” shown in the Data menu of controller. 

NOTE: Unit will operate normally without compressor sensor. However, controller compressor high temperature protection is not active.