In applicants’ most preferred embodiment, this control
process is actuated Whenever the EVOP value is above 99
psig for a predetermined period of time (e.g., 20 seconds)
and compressor 116 has been on for some time (e.g., 5
minutes or more). For control stability and accuracy
purposes, this control process, When engaged, should pref
erably be in effect (i.e., monitoring return air and calculating
reference saturated temperatures) for a minimum period of
time (e.g., 2 minutes). Also, Whenever the system is sWitch
ing to or from this control process, the desired superheat
setting should be gradually ramped up or doWn to its desired
level over a period of time (e.g., at least 60 seconds).