Thermal Care Accuchiller KSE, Operation, Installation, And Maintenance Manual

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General Troubleshooting
Problem Possible Cause Remedy
Compressor will
not start
Three-phase power monitor tripped Check correct phasing of incoming power
Compressor overload Check supply voltage, amperage of each leg, contactor and
wiring, overload set point
Compressor contactor Replace if faulty
PLC output card Replace if faulty
Compressor failure Contact Customer Service Department for assistance
Low refrigerant
pressure
Low refrigerant charge Contact refrigeration service technician
Refrigerant leak Contact refrigeration service technician
Compressor suction service valve partially or fully closed Open valve all the way
Low refrigerant pressure sensor Replace if faulty
PLC input card Replace if faulty
Fouled evaporator flow Clean evaporator inlet strainer. Clean the evaporator. If
clogged and not cleanable, replace if necessary.
Low evaporator flow Check evaporator pumping system
High refrigerant
pressure
Plugged condenser Clean condenser
Compressor discharge service valve is fully or partially
closed Open valve all the way
Refrigerant circuit overcharged Contact refrigeration service technician
High refrigerant pressure sensor Replace if faulty
PLC input card Replace if faulty
Freezestat
Low flow through evaporator Adjust flow to proper level
Freezestat control Check for proper setting and replace if faulty
Temperature sensor Replace if faulty
PLC input card Replace if faulty
Evaporator Y-strainer clogged or dirty Clean Y-strainer
Insufficient
cooling
(temperature
continues to rise
above set point)
Process load too high Check to make sure chiller is properly sized for process load
Coolant flow outside of normal operating range Adjust flow to proper level
Insufficient condenser cooling See high refrigerant pressure
Refrigeration circuit problem Contact refrigeration service technician
Temperature sensor Replace if faulty
PLC input card Replace if faulty
Erratic
temperature
control
Low coolant flow through evaporators Adjust flow to proper level
Overloading of chiller capacity Check to make sure chiller is properly sized for process load
Temperature sensor Replace if faulty
PLC input card Replace if faulty