A rooftop utilizing R-410A with a fixed orifice metering device has a customer complaint of “no cooling.” The symptoms confirm that the thermostat is not satisfied and the condensing unit and blower are running continuously. The system has only had maintenance, and no service issues. What are the “possible causes” (there is only one problem intended) with the following measured conditions on this field service check sheet?
Field Service Check Sheet
Check back on July 13 for the answer to this issue’s Tech Challenge.