Planned Preventative Maintenance Remedial on a McQuay Chiller
Job Description: Planned Preventative Maintenance Remedial on a McQuay Chiller
Area: Cunard House, London
Issue Identified: It was highlighted after a PPM (planned preventative maintenance) that both circuits on the chiller had leaks with the initial leak on the Schrader core assembly. It was also noted that both circuits were low on compressor oil.
Works carried out:
- Isolated the McQuay Chiller unit electrically and mechanically.
- Recovered refrigerant from circuit A and B into a dedicated recovery cylinder.
- Pressure tested with OFN (oxygen free nitrogen)
- Found leaks on discharge service ports.
- Replaced 2 x Schrader Cores and retested.
- Once proved released Oxygen Free Nitrogen (OFN) into atmosphere and evacuated the system to a minimum of 2 Torr.
- Re-charged with the recovered refrigerant and trim charged with virgin refrigerant.
- Topped both circuits with Compressor Oil.
- Test ran and re-commissioned.
- Completed a waste transfer note and handed to on-site representative.
- Completed an F Gas certificate.