DOE-2 Reference Manual Version 2.1 - DOE2.com

6. SYSTEM-CONTROLThe function of the SYSTEM-CONTROL instruction is to provide informationon supply air temperature (set point, control strategy, and limits), humiditylimits, and to identify the appropriate equipment operating schedules. SeveralSYSTEM-CONTROL instructions may be specified if the facility is served by morethan one system and/or it is desired to conduct parametric runs.SYSTEM-CONTROL is a "subcommand" of SYSTEM and, as such, can be used toinput a subset of data to SYSTEM.An alternative mode for data entry is to complete and enter SYSTEM-CONTROLkeywords and their values directly into the SYSTEM command (if this approachis chosen, omit the SYSTEM-CONTROL keyword in SYSTEM).SYSTEM-CONTROLMAX-SUPPLY-THEATING-SCHEDULEinforms the SDL Processor that the data to follow arerelated to system temperature control, humidity control,and operating schedule. A unique user-defined name must beentered in the U-name field of each SYSTEM-CONTROLinstruction. Omission of this entry in the "subcommand"will cause an error.is the highest allowable temperature for air entering theZONE(s), that is, the highest allowed diffuser temperature.The progr am wi 11 use th i s val ue to determine the des i gn airflow rate (see Sec. D of this chapter for additional discussion).This value is also used as an upper limit for supplyair temperature control. MAX-SUPPLY-T should be greaterthan DESIGN-HEAT-T.Note that this entry is mandatory for certain types ofsystems (RESYS, MZS, DDS, SZCI, UVT, UHT, HP, HVSYS, TPFC,FPFC, TPIU, FPIU, PSZ, PMZS, PTAC) and omission will causethe program to abort. The entry is optional for othertypes of systems (SZRH, VAVS, RHFS, CBVAV, PVAVS). If noentry is made, the program will use the sum of MIN-SUPPLY-Tand REHEAT-DELTA-T (see SYSTEM-TERMINAL subcommand).is the U-name of the SCHEDULE instruction that specifiesthe time periods (hours and days) during which heating isavailable from the plant for this system. If no data entryis made, the program will assume that heating is alwaysavailable when needed. It is possible for this system (orone or more of its zones) to be calling for heating butthat heating is not available, because of the manner inwhich this schedule has been specified.See Chap. II for information on the schedule instructions(DAY-SCHEDULE, WEEK-SCHEDULE, and SCHEDULE). Note that, inthis case, the program checks only for on/off and,therefore, the hourly values entered for the DAY-SCHEDULEinstruction should be either one (heating is on) or zero(heating is off).IV.203 (Revised 5/81)