Problem

Possible cause

Solution

 

Water/glycol mixture inadequate

Make sure that the water/glycol mixture

 

protection is right for the process.

 

for process.

 

 

 

Defective or improperly set

Adjust or replace.

Water temperature is too high.

High/Low thermostat.

 

 

Refrigerant low pressure switch is

Call service to adjust pressure control.

 

set too high.

 

 

 

Refrigerant charge is low.

Call service to find and repair the leak,

 

then have refrigerant added.

 

 

 

 

Verify rotation; if running in reverse

Pump pressure low (refer to curves

Pump running in reverse.

rotation, reverse any two main power

for normal pressure for various

leads. Re-verify for correct pump

 

pumps).

 

rotation.

 

Check for foreign matter.

Clean the system.

Pump pressure is too high.

Restricted water flow.

Check for partially closed valves etc.

Make sure that all lines are properly

 

 

sized.

 

Restricted condenser air.

Clean filters.

Unit runs continuously, but not

 

Clean condenser.

Unit low on refrigerant.

Check the refrigerant charge.

enough cooling power.

Compressor not operating

Call service.

 

efficiently.

 

 

 

Unit under-sized for application.

Call sales rep.

2-40 HP Portable Chillers

Chapter 6: Troubleshooting

42 of 78

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HP A0554832 manual HP Portable Chillers Troubleshooting