paul pursehouse
08-06-2008, 02:21 AM
yesterday I installed a rebuild terry PJS compressor on a multiple evaporator system in a local hotel.The system serves 2 medium temp under counter fridges, a keg room and a glycol chiller,running on R134a refrigerant.The pipe run is 35 to 40m 7/8 suction line 1/2 inch discharge.The previous compressor had done a shaft seal and lost all the refrigerant.
After doing the change over and evacuating the system for 48hrs I began to recharge the system (vapour charging)with R134a,I started the compressor once there was enough refrigerant in it to prevent the LP operating. The compressor ran for probabley 10 - 20 mins and every now and then the shaft would squeal for a short time and a knock or 2 could be heard in the compressor.The compressor crankcase was also very hot especialy at the face plate around the shaft seal.
The 3 drive belts are not overtight with about 1/2 inch deflection.
I also notice the oil in the sight glass at stand still is over full but at the right level when running .
The system is not fully charged,sight glass not full.High side 100 lb,suction pressure 15 - 20 lb.
Do I have a faulty compressor,ie binding on the shaft seal? or a crook oil separator returning too much oil to the suction side.any advice would be appreciated.
thanks Paul
After doing the change over and evacuating the system for 48hrs I began to recharge the system (vapour charging)with R134a,I started the compressor once there was enough refrigerant in it to prevent the LP operating. The compressor ran for probabley 10 - 20 mins and every now and then the shaft would squeal for a short time and a knock or 2 could be heard in the compressor.The compressor crankcase was also very hot especialy at the face plate around the shaft seal.
The 3 drive belts are not overtight with about 1/2 inch deflection.
I also notice the oil in the sight glass at stand still is over full but at the right level when running .
The system is not fully charged,sight glass not full.High side 100 lb,suction pressure 15 - 20 lb.
Do I have a faulty compressor,ie binding on the shaft seal? or a crook oil separator returning too much oil to the suction side.any advice would be appreciated.
thanks Paul