DOE-2 Reference Manual Version 2.1 - DOE2.com

ZONE Cooling Mode for TPIU and FPIU:The output of the zone coil, when in the cooling mode, is controlled bythe user input for the keyword COOL-TEMP-SCH.At calculated ZONE temperatures above the cooling THROTTLING-RANGE, theoutput of the cooling coil in the ZONE induction unit is at its maximum. Asthe calculated ZONE temperature drops from the top to the bottom of thecooling THROTTLING-RANGE, the cooling output decreases linearly from itsmaximum to zero. At calculated ZONE temperatures below the top of thedeadband, the output of this coil is zero and the only heating or cooling isdone by the primary air. The air flow rate is always constant, assuming theFAN-SCHEDULE is on.SYSTEM Heating Mode for TPIU and FPIU:When the TPIU is operating in the winter mode (that is, when the hourlyvalues in the SCHEDULE referenced by INDUC-MODE-SCH are negative), theterminal unit coils are in the heating mode. At this time, the primary aircontroller is reset to COOL-SET-T if COOL-CONTROL; CONSTANT, or MIN-SUPPLY-Tif COOL-CONTROL * CONSTANT. Thus, outside air is used for cooling (or thereis active cooling if COOLING-SCHEDULE * 0).For the FPIU, the primary air temperature is controlled by the user inputfor COOL-CONTROL (normally RESET).If the user does not specify a value for HEAT-SET-T, it will default toMIN-SUPPLY-T, thus sizing the heating coil to zero.ZONE Heating Mode for TPIU and FPIU:Zone heating is controlled by the user input for HEAT-TEMP-SCH. Thiscontrols the zone coil heating output. Alternatively, the user may supply theadditional heating at the ZONE level with baseboard heaters.At calculated ZONE temperatures above the heating THROTTLING-RANGE, theheating output of the ZONE coil is zero. As the calculated ZONE temperaturedrops from the top to the bottom of the heating THROTTLING-RANGE, the outputof the ZONE coil increases linearly from zero to its maximum. At ZONEtemperatures below the heating THROTTLING-RANGE, the output remains atmaximum. The air flow rate is always constant, assuming the FAN-SCHEDULE ison.The heat from the supply air fan is added to the primary air downstreamfrom the cooling coil, unless the user specifies FAN-PLACEMENT;BLOW-THROUGH. The effect of the humidifier is added to the mixed air stream.Procedure:(1) Specify SYSTEM-TYPE; TPIU or FPIU in the SYSTEM command.(2) Specify input for COOL-CONTROL in the SYSTEM-CONTROL subcommand,according to the preceeding suggestions.I V.158 (Revised 5/81)