41
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
Insufficient condenser water flow (TSEW only)
Make sure chiller is installed in accordance with
recommendations in this manual
High condenser water temperature (TSEW only)
Maximum temperature is 95°F
Condenser water regulating valve (TSEW only)
Replace if faulty
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
