Instruction manual

K4, K6, K9 series chillers – Installation and Operation manual
Issue 10.33
Page 15
Symptom: Chiller too warm
Cause…
Check…
Action…
Compressor not running
Loose wiring?
Locate and correct cause of fault.
Fuses and/or earth leakage trip
OK?
Check crimped terminals
Phase failure of 3 phase supplies
Check orientation of phases by
looking at fluid flow direction.
Symptom: Chiller too warm
Cause…
Check…
Action…
Compressor is running, but
under the following conditions:
Low evaporating pressure
Refrigerant volume OK?
Find leaks, repair, add refrigerant
Evaporator fouled?
Clean evaporator
Evaporator iced?
Adjust defrost settings or repair
defrost system
High condensing pressure
Refrigerant volume OK?
Reduce refrigerant charge
Condenser fouled?
Clean condenser
Fan motor/blade OK?
Repair/replace
Incorrect superheat
TEV setting correct?
Adjust TEV
Evaporator or condenser fans
working incorrectly
Direction of rotation OK?
Reverse rotation
Fan motor/blade OK?
Repair/replace
Evaporator or condenser air flow
restricted
Condenser fouled?
Clear fouling from air-side face of
condenser
Fin block fouled?
Blow through fin block with
compressed air, or with specialist
fin block cleaner
Evaporator fin block frozen?
Adjust defrost settings or repair
defrost system
Prolonged bubbles in liquid line
sight glass
Refrigerant volume OK?
Find leaks, repair, add refrigerant
Pressure drop through filters?
Clean filters
Condenser blockage?
Clean condenser