CEMP-E
TI 811-12
18 August 1998
(b)
Control signal to close OA damper (as required by equipment control circuit) one per
OA damper.
b. Software I/O requirements. The software requirements are:
(1)
Program inputs.
(a)
Day of week/holiday.
(b)
Time of day.
(c)
Summer or winter operation.
(d)
Summer and winter occupancy schedules.
(e)
Equipment status.
(f)
Space temperature
(g)
Maximum space temperature during unoccupied periods (cooling).
(h)
Minimum space temperature during unoccupied periods (heating).
(i)
Equipment constraints.
(2)
Program output.
(a)
Day/night control signal.
c. Application notes. The day/night setback program operates in conjunction with the scheduled
start/stop and optimum start/stop programs. Space temperature instruments will be located to preclude
freezing during the night setback period.
15. HOT WATER OA RESET. Hot water heating systems, whether the hot water is supplied by a boiler
or a converter, are designed to supply hot water at a fixed temperature. Depending on the system
design, the hot water supply temperature may be reduced as the heating requirements for the facility
decrease. A reduction in hot water supply temperature results in reduction of heat loss from equipment
and piping. To implement this program, the temperature control setpoint for the hot water supply is reset
as a function of OA temperature. Design requirements for this applications program will be indicated by
inclusion of an OA temperature reset schedule on the appropriate database table, as shown in Chapters
8 and 9.
a. Field hardware requirements. The hardware requirements are:
(1)
System inputs from DE.
(a)
Hot water supply temperature - one per boiler or converter.
(b)
OA dry bulb temperature.
(2)
UMCS outputs to utility system. Hot water supply temperature CPA - one per boiler or
converter.
b. Software I/O requirements. The software requirements are:
(1)
Program inputs.
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