Sporlan Head Pressure Control for systems with air cooled condensers can be accomplished with several valve types or combinations. The valve types are: LAC-4, OROA-5, LAC-5, LAC-10, ORI/ORD combination and the ORIT/CROT combination.

The equipment manufacturer should be consulted to determine the additional refrigerant charge required when applying this type of head pressure control to a system. However, if this information is not available from the OEM, Bulletin 90-30-1 shows two methods for calculating the correct amount of extra refrigerant charge.
 
 
  LAC, OROA, ORI and ORIT
   

The LAC, OROA, ORI and ORIT are designed for application in the liquid line and should not be applied in the discharge line for any reason. Compressor pulsations can greatly shorten the life of the valves. If any of the valves are applied in any manner other than described here, the Sporlan warranty is void.
 
 
 

LAC-4 - DS (Dual Setting)
   

The standard LAC-4 has a dome element with a fixed setting. The dual setting feature allows a choice between two fixed settings. The element has an internal spring which is set to maintain the lower setting. The element is then charged with air to obtain the higher setting and the capillary tube is pinched and fused. An example is an LAC-4-100/180-DS. If the capillary tube is left intact the valve will maintain a 180 psig setting. If the capillary tube is clipped then fused again, the valve will maintain a 100 psig setting. It is important to fuse the capillary tube tip after clipping to prevent moisture from entering the element.