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Copyright 2020 - NICHOLAS A. CHAZAPIS


The following items to be demonstrated:

a. DDC / BAS loop response. The contractor will supply trend data output in a graphical form showing the step response of each DDC / BAS loop. The test will show the loop’s response to a change in set point, which represents a change of actuator position of at least 25% of its full range. The sampling rate of the trend will be from 10 seconds to 3 minutes, depending on the speed of the loop. The trend data will show for each sample the set point, actuator position, and controlled variable values. Any loop that yields unreasonably under-damped or over-damped control will require further tuning by the Contractor.

b. Demand limiting. The contractor will supply a trend data output showing the action of the demand limiting algorithm. The data will document the action on a minute-by-minute basis over at least a 30-minute period. Included in the trend will be building kW, demand limiting set point, and the status of sheddable equipment outputs.

c. Optimum start/stop. The contractor will supply a trend data output showing the capability of the algorithm. The change-of-value or change-of-state trends will include the output status of all optimally started and stopped equipment, as well as temperature sensor inputs of affected areas.Interface to the building fire alarm system.

d. Operational logs for each system that indicate all set points, operating points, valve positions, mode, and equipment status will be submitted to the architect/engineer. These logs will cover three 48-hour periods and have a sample frequency of not more than 10minutes. The logs will be provided in both printed and disk formats.

Any tests that fail to demonstrate the operation of the system BAS, will be repeated at a later date.

The contractor will be responsible for any necessary repairs or revisions to the hardware or software to successfully complete all tests.