18 August 1998
OA dry bulb temperature.
Maximum HW supply temperature.
Program output. HW temperature setpoint.
c. Application notes. A dedicated local loop controller may be implemented, depending on site
16. LIGHTING CONTROL. Time scheduled operation of lighting consists of turning lights off based on
the time of day and the day of the week. Additional off commands may be generated at regular intervals
to ensure that lights are off (relay operated zoned lighting only). Emergency lighting is not to be
controlled by this program. Design requirements for this applications program will be indicated by the
letter X adjacent to the scheduled start/stop program listing on the appropriate database table, as shown
in Chapters 8 and 9.
a. Field hardware requirements. The hardware requirements are:
(1) UMCS outputs to utility system. Start/stop control signal to interposing relays - typically one
for each lighting circuit to be controlled.
b. Software I/O requirements. The software requirements are:
Day of week/holiday.
Time of day.
Summer and winter start/stop schedules.
Times of day for additional off commands (where applicable).
c. Application notes. The lighting control program is used in conjunction with the scheduled
17. UNITARY CONTROLLER APPLICATIONS PROGRAMS. A number of application-specific unitary
controllers are available with applications programs for specific types of equipment. Examples are
heating and ventilating units, air volume control, and air distribution terminal unit control programs.
Design requirements for these applications programs will be indicated in the sequence of operations as
shown in Chapter 8.
18. UTILITY CONTROL FUNCTIONS AND SEQUENCES OF OPERATION.
a. In addition to the pre-established applications programs listed in this chapter, the UMCS utilizes
several basic control functions in combination for control of utility systems. These control functions
include event-driven control, two position control, floating point control, and proportional-plus-integral-plus
derivative (PID) control. Structured combinations of these basic control functions applied to specific utility
systems are referred to as sequence of operation.