Patent ID: 8041542

Claim:
A computer implemented method of monitoring the health of a system comprising: storing a first plurality of system data associated with at least one steady state capacity level in a memory, wherein the memory is accessible by a building supervisory controller; obtaining a second plurality of system data indicative of system conditions during system operations; identifying from the second plurality of system data that the system was operating at a normal operating level during at least one sample window of the system operations; associating the normal operating level of the at least one sample window with the at least one steady state capacity level; retrieving first health data for parameters associated with a first health condition from the first plurality of system data; retrieving second health data for parameters associated with the first health condition from the second plurality of system data that were obtained during the at least one sample window; comparing the first health data with the second health data; determining by the building supervisory controller if the second health data is indicative of a health condition based upon the comparison; and displaying the results of the determination.