Repairs to a Delonghi Powermaster Chiller
Schedule of Works:
Pressure testing of circuit 2 to manufacturers recommendations. All minor leakages such as fittings/flares will be repaired. Once all leakages have been repaired, we will undertake a final pressure test and system evacuation with commissioning of virgin refrigerant also confirming any further findings on start up.
Works Carried Out:
- Carried out a full pressure test on circuit 2.
- Recovered 35 kg of the 46kg charge which indicated that there was a large leak.
- There were a few leaks found on the Schrader and the t piece that the high-pressure transducer connects.
- Replaced the t piece and put the chiller on pressure test again.
- We found that the front end of the compressor was leaking, therefore we replaced the gasket with our lift and shift team.
- We put the system back on pressure test over night to be sure that our repairs had been successful.
- When we returned in the morning the pressures had not dropped so we put it on vacuum overnight.
- When we returned the unit had pulled down to 2.5 torr.
- We carried out a rise test for 45 minutes to make sure there were no more leaks, it stayed at 2.5 torr.
- We charged the unit while this was happening, we changed over the solenoid coil to a new one due to the other one being burnt out.
- We replaced the fuses however, one of the auxiliary’s was blocked therefore we had to replace it.
- We achieved design pressures and parameters as per manufacturers recommendations upon commissioning
- We cleared site and left.