Zulu
29-07-2013, 12:12 PM
Hello,
Using a system with bitzer semi hermetic compressor 8FC-70.2Y40D for DX air conditioner. AHU is having danfoss electrical expansion valves AKV-20 - 2nos. System is operating with R404A. Unit is designed for 218 kW cooling capacity with evap temp of 4.5 deg c and condensing of 47.6 deg C. Condenser is sea water cooled. Total 4 units. Desgined air inlet is 30 deg C and air outlet of 9 deg C. Actual observed parameters are 26 deg C and 21 deg C. AHU is copper coil with Al fins. Suction pressure at compressor is 3.8 kg/cm2 and discharge pressure is 14 kg/cm2. Oil pressure is 3 kg/cm2.
The unit runs for 2000 hours and after that the compressor breakdown occurs. Winding failure observed. Same problem is observed on all 4 units. Current drawn is also 50 Amp.
Can anybody help to identify the cause of failure.
Using a system with bitzer semi hermetic compressor 8FC-70.2Y40D for DX air conditioner. AHU is having danfoss electrical expansion valves AKV-20 - 2nos. System is operating with R404A. Unit is designed for 218 kW cooling capacity with evap temp of 4.5 deg c and condensing of 47.6 deg C. Condenser is sea water cooled. Total 4 units. Desgined air inlet is 30 deg C and air outlet of 9 deg C. Actual observed parameters are 26 deg C and 21 deg C. AHU is copper coil with Al fins. Suction pressure at compressor is 3.8 kg/cm2 and discharge pressure is 14 kg/cm2. Oil pressure is 3 kg/cm2.
The unit runs for 2000 hours and after that the compressor breakdown occurs. Winding failure observed. Same problem is observed on all 4 units. Current drawn is also 50 Amp.
Can anybody help to identify the cause of failure.