Chiller Troubleshooting
ARTC-SVX002A-EN 63
2. Symptom: Compressor will not run
Possible Causes Potential Solutions
Compressor will not run Assure all breakers and switches are on
Main switch open or circuit breakers open Check circuits and motor winding for shorts or grounds
Fuse is blown Replace fuse or reset breakers after fault is corrected
Investigate for possible overloading.
Overloads are auto-reset. Monitor to assure the overload does not re-
occur.
Thermal overload breaker tripped or fuses blown Repair or replace
Defective contactor or coil Determine type and cause. Correct fault before resetting safety.
System shut down by safety devices Repair or replace coil
Liquid line solenoid will not open Check motor for open circuit, short circuit, or motor burnout
Motor electrical trouble Tighten all terminal screws
3. Symptom: Compressor has excessive noise or vibration
Possible Causes Potential Solutions
Flooding of refrigerant into crankcase Check setting of expansion valve
Improper discharge piping support Relocate, add, or remove supports
Improper or worn compressor supports Replace supports
Worn compressor Replace or rebuild compressor
4. Symptom: Compressor will not load or unload
Possible Causes Potential Solutions
Defective capacity control Repair or replace module
Unloader mechanism defective Replace unloader
Faulty thermostat gauge or broken capillary tube Replace thermostat assembly
Stages not properly set for application Reset thermostat setting for operating requirements
5. Symptom: Compressor Loading/Unloading Cycles Too Short
Possible Causes Potential Solutions
Temperature differential set too low (4 °F (2 °C) minimum) Ramp/set temperature set point
Erratic water thermostat device Replace thermostat assembly
Insufficient evaporator water flow Adjust flow rate or remove flow
6. Symptom: Compressor loses oil
Possible Causes Potential Solutions
Low refrigerant charge Check for leaks and repair. Add refrigerant to proper charge.
Gas velocity in risers too low Check riser sizes against compressor gas flow
Oil trapped in line Check pitch of lines and refrigerant velocities
Excessive compression ring blow by Replace or rebuild compressor
Liquid refrigerant
Check compressor superheat. Superheat at the compressor suction
should be approximately 15° F (8.3° C).
7. Symptom: Low refrigeration suction pressure
Possible Causes Potential Solutions
Lack of refrigerant Check for leaks. Repair and add charge.
Evaporator dirty Clean chemically
Clogged suction line or suction gas strainers Clean strainers
Condensing temperature too low Check condensing temperature regulation system
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