How are the motor windings on this machine cooled? Via refrigerant? If so I'd be looking at the low charge perhaps contributing to the problem. Any record of discharge superheat taken?
Surging is murder on a chiller comp and motor. What were the causes behind low chilled water flow?
- Electricity makes refrigeration happen.
- Refrigeration makes the HVAC psychrometric process happen.
- HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.
A building is NOT beautiful unless it is also comfortable.