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Problem
Water temperature is too high.
Pump pressure low (refer to curves
for normal pressure for various
pumps).
Pump pressure is too high.
Unit runs continuously, but not
enough cooling power.
2-40 HP Portable Chillers
Possible cause
Water/glycol mixture inadequate
for process.
Defective or improperly set
High/Low thermostat.
Refrigerant low pressure switch is
set too high.
Refrigerant charge is low.
Pump running in reverse.
Check for foreign matter.
Restricted water flow.
Restricted condenser air.
Unit low on refrigerant.
Compressor not operating
efficiently.
Unit under-sized for application.
Chapter 6: Troubleshooting
Solution
Make sure that the water/glycol mixture
protection is right for the process.
Adjust or replace.
Call service to adjust pressure control.
Call service to find and repair the leak,
then have refrigerant added.
Verify rotation; if running in reverse
rotation, reverse any two main power
leads. Re-verify for correct pump
rotation.
Clean the system.
Check for partially closed valves etc.
Make sure that all lines are properly
sized.
Clean filters.
Clean condenser.
Check the refrigerant charge.
Call service.
Call sales rep.
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