Screw Compressor Central Chiller
Chapter 6: Troubleshooting
69
Problem
Possible cause
Corrective action
Restricted condenser air flow.
Clean condenser.
Refrigerant not feeding.
Check superheat on expansion
valve.
Improper water/glycol solution.
Make sure that coolant mixture
protection is right for the
process.
Poor heat transfer in evaporator.
Backflush and clean evaporator.
Unit low on refrigerant.
Call service.
Low water flow through
evaporator.
Increase flow to design flow of
2.4 gpm/ton.
Inefficient compressor.
Call service.
Unit runs continuously, but not
enough cooling power.
Unit under-sized for
application.
Call sales representative.
