Why is my SUPERHEAT / SUBCOOLING reading displayed as “OL” or “-OL”?
An “OL” reading for superheat or a “-OL” for subcooling could mean that the system is severely undercharged, however this level of undercharge is rarely achieved and therefore, check the following: Make certain thermocouple is connected properly and the temperature has been calibrated. Make certain the proper refrigerant is selected on your Fieldpiece tool. Make certain hoses and fittings are fastened securely, in the proper location for your measurement, and free from leaks. Also make certain that the unit has been calibrated to ambient pressure. A negative “-OL” in superheat or a positive “OL” in subcooling indicates that the system is severely overcharged and therefore the system may be flooding liquid refrigerant into the compressor. Check all suspicious measurements with your own calculations before condemning any unit. If it appears your unit is functioning improperly, contact Fieldpiece technical support at 714.257.9060.
