Denco Unit Repairs

Denco Unit Repairs

Job Description: Denco Unit Repairs

Area: St James Market, London

Issue Identified:  Following a recent call out the engineer advised that the Denco Unit had lost all its refrigerant and required a pressure leak test to locate any leaks.

Works carried out:

  • Isolated the unit electrically and mechanically.
  • Pressure tested the system with OFN (oxygen free nitrogen) to confirm leak.
  • Leak found on cracked joint pipe leaving evaporator coil.
  • Effect welded repair and replaced filter drier and re-tested with nitrogen.
  • Once proved released OFN (oxygen free nitrogen) to atmosphere and evacuated system to a minimum of 2 Torr.
  • Re-charged with refrigerant.
  • Test ran and re-commissioned.
  • Completed waste transfer note and handed to on-site representative.
  • Completed F Gas records
Abbreviations

HVAC – Heating, Ventiliation and Air Conditioning, PLT – Pressure Leak Test,  PRV – Pressure Relief Valve, PPM – Planned Preventative Maintenance, OFN – Oxygen Free Nitrogen, AHU – Air Handling Unit, GWP – Global Warming Potential, VRF – Variable Refrigerant Flow, VRV – Variable Refrigerant Volume, ACU – Air Conditioning Unit, FCU – Fan Coil Unit, AC – Air Conditioning,  HP – High Pressure, LP – Low Pressure

Ref: 1923