Instruction manual

K4, K6, K9 series chillers – Installation and Operation manual
Issue 10.33
Page 16
Symptom: Chiller too cold
Cause…
Check…
Action…
Thermostat
Temperature and differential OK?
Adjust setting to maximum level
for product quality
Thermostat / bulb damaged?
Repair/replace
Equipment runs continuously
Control circuit OK?
Correct faulty wiring/control
Symptom: Unit cycles rapidly or shuts down after short period of operation
Cause…
Check…
Action…
Thermostat
Temperature and differential OK?
Adjust setting to maximum level
for product quality
LP switch
Refrigerant volume OK?
Find leaks, repair, add refrigerant
Evaporator fouled/iced?
Clean evaporator, repair/adjust
defrost system
Water-cooled condenser control
valve failed open?
Check for running water when
chiller is shut down
HP switch
Condenser fouled?
Clean condenser
Fan assembly damaged?
Repair/replace
Poor water supply to water-
cooled condenser? Failed valve?
Check cooling water
supply/temperature/pressure.
Check water flow out of chiller
when running
Ambient too high / inadequate air
flow?
Reduce ambient / increase cool air
supply to condenser
Discharge temperature protection
As for HP switch, above
As for HP switch, above
Symptom: Other malfunction
Cause…
Check…
Action…
Compressor noisy
3 phase direction OK?
Correct orientation
Compressor mounting vibration?
Improve vibration isolation
Compressor oil level OK?
Repair leaks, add oil
Drive and alignment of open
compressors OK?
Repair drive and/or realign motor
and compressor
Electrical supply unbalanced?
Correct supply
Condensing unit noisy
Condensing unit pipe work OK?
Improve isolation and fixing
continued…