Cooling Plant (Chilled Water Unit)

Refrigerant circuit: check for leaks at all fittings, sight glass clarity (no bubbles = full charge), and refrigerant pressure/temperature readings against design curves

Compressor: verify oil level (reciprocating/screw) or magnetic bearing status (Turbocor), check for unusual noise/vibration, inspect electrical connections and motor insulation resistance

Condenser (seawater-cooled): inspect titanium or Cu/Ni tube bundle for fouling, biological growth, and corrosion; verify seawater flow rate and differential pressure across heat exchanger

Evaporator / chilled-water circuit: check flow rate, inlet/outlet temperature differential (design: 6/12 °C), inspect glycol concentration and inhibitor levels, clean strainers

Control panel and safety devices: test high-pressure cut-out, low-pressure cut-out, flow switches, and anti-freeze thermostats; verify calibration of temperature and pressure sensors

Expansion valve / electronic expansion device: confirm superheat and subcooling settings match commissioning data; inspect for hunting or erratic operation

Structural and mounting integrity: inspect vibration isolators/anti-vibration mounts, check for corrosion on frame (especially SS316Ti on MCMV units), verify all bolts and pipe supports are tight

Filter-drier and moisture indicators: inspect drier cartridge condition and moisture indicator sight-glass colour; replace drier if moisture is detected or after refrigerant circuit opening