It is important to size the main line to accommodate the system capacity.  To large a line can lead to problems with oil return (burnouts of the compressor will result) or too small can result in excessive pressure drop which will reduce the system capacity.  A good utility is the “refrigerant line sizing” program located at boxload.tecumseh.com.  Input the parameters of the system and it will recommend a suitable line size for both Liquid and Suction lines. [maxbutton id=”4″ url=”https://boxload.tecumseh.com/RefLineSizing.aspx” text=”Line Set Sizing” ] For a single evaporator the total amount of pressure drop for the suction line should be equal to 1 to 1.5 degree F.  This will vary depending…