CenTraVac

A rising approach temperature means heat transfer is degrading. On the condenser side this is almost always tube fouling. On the evaporator side it can also be low refrigerant charge. Calculate both approach temperatures from the operating log and address the affected side.

Short cycling at low load means the chiller is hunting around its setpoint or the system load is below the minimum stable capacity. Widen the chilled water setpoint deadband and check the inlet guide vane minimum stop.

Multiple spurious alarms usually point to a single faulty sensor or a wiring issue sending bad data to the controls board. Cross-check each alarmed sensor reading against an independent instrument before replacing the controls board.

High discharge pressure is almost always fouled condenser tubes or non-condensable gas in the refrigerant circuit. Calculate approach temperature first, then clean tubes or purge non-condensables as indicated.

Low cooling output is most often a low refrigerant charge or fouled condenser tubes. Check the approach temperature across the condenser, read the operating log for refrigerant suction and discharge pressures, and contact a licensed refrigerant technician if charge is suspect.

A low oil alarm means the compressor sump is not maintaining adequate oil level. Check the oil return system and oil separator before adding oil, since adding oil to a system with a return problem only delays the next alarm.