DOE-2 Reference Manual Version 2.1 - DOE2.com

separated, as explained earlier. Second, if the user is using nighttimesetback or setup of the ZONE temperature, he may experience "forced" setbackor setup, especially if a small THROTTLING-RANGE has been specified. Forcedsetback is the process that occurs when the winter heating temperature islowered at night and the cool i ng sys tem turns on and dr ives the temperaturedown, rather than allowing the temperature to drift down to the setbacktemperature. If this occurs, it is the fault of the user's input, not theprogram. The occurrence of "forced" setback or setup can easily be detectedin the HOURLY-REPORTs but may go unnoticed in the VERIFICATION and SUMMARYreports.Cold and Hot Deck Temperatures:For central systems, the temperature of the cold air stream (cooling coilor cold deck temperature) is set at the SYSTEM level in the SYSTEM-CONTROLsubcommand. The value specified for the keyword COOL-CONTROL determines themethod for setting the cooling coil (or cold deck) temperature. If the userspecifies COOL-CONTROL = CONSTANT, he should specify a value for COOL-SET-T,or allow it to default to MIN-SUPPLY-T (bear in mind, MIN-SUPPLY-T is definedas the lowest allowable temperature for air entering the ZONE(s); it is thecooling coil, or cold deck, temperature only when COOL-SET-T is allowed todefault, or when the program resets th is temperature to MIN-SUPPL Y-T). If theuser specifies COOL-CONTROL = RESET, he must specify COOL-RESET-SCH (plus anassociated RESET-SCHEDULE), and if the user specifies COOL-CONTROL =SCHEDULED, he must specify COOL-SET-SCH (plus an associated SCHEDULE). If theuser specifies COOL-CONTROL = WARMEST, the program will automatically resetthe cooling coil (or cold deck) temperature each hour in an attempt toadequately cool the ZONE with the "highest relative temperature in its cool ingTHROTTLING-RANGE". This value is expressed in per cent (if this value isequal to or greater than 100 per cent, for anyone or more ZONEs, it meansthat the cooling coil will be operated at its maximum capacity). Fig IV.3illustrates graphically how the WARMEST ZONE is determined by the program. Ifconflicting input is specified by the user, the value for COOL-CONTROL alwaystakes precedence.I V .110 (Revised 5/81)