TEC Zoning Control System for Stand-Alone and BACnet® MS/TP ...
TEC Zoning Control System for Stand-Alone and BACnet® MS/TP ...
TEC Zoning Control System for Stand-Alone and BACnet® MS/TP ...
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Table 12: <strong>TEC</strong>2664Z-2 Rooftop <strong>Control</strong>ler Installer Configuration Menu (Part 5 of 5)Parameter Description <strong>and</strong> Default Selection OptionsAppearingon DisplayUnocc HT 4 If network communication is lost Range: 40.0°F/4.5°C to 90.0°F/32.0°Cwith the zone controller(s), thereturn air sensor controls the rooftopcontroller to maintain thisUnoccupied Heating setpoint.Default: 62.0°F/17.0°CSp range 6Pressure 6Sets the static pressure transducerrange.Default: 0Sets the static pressure transducersetpoint maintained by the bypassdamper.Default: 0.8 in. W.C./200 Pa(0): 0 in. W.C./0 Pa to 1.5 in. W.C./375 Pa(1): 0 in. W.C./0 Pa to 2 in. W.C./500 Pa(2): 0 in. W.C./0 Pa to 3 in. W.C./750 Pa(3): 0 in. W.C./0 Pa to 4 in. W.C./1,000 Pa(4): 0 in. W.C./0 Pa to 5 in. W.C./1,250 PaRange: 0 in. W.C./0 Pa to 2 in. W.C./500 Pa1. RTC MAC is the unique device address of the rooftop controller (from 004 to 127) on the <strong>MS</strong>/<strong>TP</strong> network.2. Local Unocc Override appears only when in the Unoccupied mode.3. When adjusting the numeric value, press the UP/DOWN arrow key to change the value by single increments; press <strong>and</strong>hold the UP/DOWN arrow key to change the numeric value in increments of ten.4. When adjusting the temperature, press the UP/DOWN arrow key to change the value in 0.5F°/0.5C° increments; press <strong>and</strong>hold the UP/DOWN arrow key to change the value in 5.0F°/5.0C° increments.5. When adjusting the temperature, press the UP/DOWN arrow key to change the value in 5.0F°/5.0C° increments; press <strong>and</strong>hold the UP/DOWN arrow key to change the value in 50.0F°/50.0C° increments.6. This value is adjustable in 0.1 in. W.C./25 Pa increments.<strong>TEC</strong>2664Z-2 Rooftop <strong>Control</strong>ler Operation <strong>and</strong> StrategyContrary to low-end commercial <strong>and</strong> residential zone controllers that usetwo-position dem<strong>and</strong> <strong>and</strong> no dem<strong>and</strong> logic to energize heating <strong>and</strong> cooling, the<strong>TEC</strong>2664Z-2 Rooftop <strong>Control</strong>ler uses PI dem<strong>and</strong> to operate heating <strong>and</strong> coolingstages. In addition, accurate temperature control at the zones is achieved via aunique, time-proportioning algorithm that virtually eliminates temperature offsetassociated with traditional, differential-based zone controllers. This featureenables per<strong>for</strong>mances <strong>and</strong> control sequences that are much closer to what isnormally found in DDC application-specific control devices.The operation of the rooftop controller is directly related to the operation of thededicated zone controllers. Although the rooftop controller can operate in ast<strong>and</strong>-alone manner if network communication is lost, normal system operationrequires that this network communication is functional.Data Exchange between the Rooftop <strong>Control</strong>ler <strong>and</strong> the ZonesHeating <strong>and</strong> cooling dem<strong>and</strong> is first exchanged from the zone controllers to therooftop controller. These output values are based on the PI heating weightconfiguration <strong>and</strong> the PI cooling weight configuration. Each voting zone alsocalculates its dem<strong>and</strong> values based on the occupancy mode <strong>and</strong> setpoints currentlyin use: either Unoccupied, <strong>St<strong>and</strong></strong>by, or Occupied.36<strong>TEC</strong> <strong>Zoning</strong> <strong>Control</strong> <strong>System</strong> <strong>for</strong> <strong>St<strong>and</strong></strong>-<strong>Alone</strong> <strong>and</strong> <strong>BACnet®</strong> <strong>MS</strong>/<strong>TP</strong> Networked ApplicationsTechnical Bulletin