refrigeration compressor,mycom,,sabroe,bitzer,grasso, Insufficient refrigerant charge :

 Insufficient refrigerant charge :
1.Abnormally warm liquid lines :
  When the liquid level in the condeser/
  receiver falls below the liquid line outlet,
  a mixture of liquid and warm high-pressure
  gas will full the liquid line.
2.Bubbles in the sight glaas in the liquid line :                                                                                                     The gas/liquid mixture is visible in the sight
   glass.large bubbles indicate that it is
   necessary to recharge with refrigerant.
   The gaseos mixture in the liquid line
   often leads to noise in the expansion valve.
3.Low suction pressure :
   The tremperature in the refrigeration system
    at the cooling surface and in the suction
     line will be relatively high in relation to the
     suction pressure observed, due to reduced
     supply of refrigerant to the evaporator
4.Reduced plant capacity.
5.Low discharge pressure :
   Reduce the condeser cooling. if the
   discharge pressure does not rise quickly,
   three may be insufficient refrigerant in the
   plant.

INSUFFICIENT OIL PRESSURE

INSUFFICIENT OIL PRESSURE
Oil discharge valve set too low
Remark : The oil pressure does notsufficiently to move the unloading piston
               Set the oil pressure correctly   
Insufficient oil in the compressor
Remark : Insufficient oil in the compressor can mean that the oil pressure does not rise sufficiently to       move the unloading pistons.
Charge the compressor with oil and check the reason for oil consumption