19 Temperature Too Far From Setpoint MP4000

Description

Temperature Too Far From Setpoint 

• Occurs during Normal Run only. 
• After 75 minutes of operation, supply or return air temperature is not in-range and does not approach setpoint within preset pull-down rate. 
• Indicates: 
• Ice or frost on evaporator coil. 
• Low refrigerant charge. 
• Air exchange vent open too much. 
• Container air leakage (doors open). 

Corrective Action 

• Use DATA menu to check supply and return air sensor temperatures. 
• Compare temperatures to evaluate unit cooling capacity and performance. 
• Temperature difference should be 4 C to 6 C (7.2 F to 10.8 F). 
• Open evaporator door. Inspect coil for ice or frost and initiate manual defrost if necessary. • Check refrigerant charge 

NOTE: This alarm can be activated if the supply or return air temperature varies, even if the mean temperature does approach setpoint.