TEC Zoning Control System for Stand-Alone and BACnet® MS/TP ...

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PIR Onboard Occupancy Sensor (TEC2647Z-2+PIR Model)The PIR onboard occupancy sensor allows for automatic switching between fullyadjustable occupied and standby temperature setpoints without user interaction.This feature results in incremental energy savings during scheduled occupiedperiods when the space is not being used.Demand-Based Heating and Cooling SystemThe system operation determines which zone controllers have heating and coolingweighted votes used by the associated rooftop controller. The rooftop controlleruses the weighted heating and cooling demand values from selected zones todetermine if heating or cooling action is required for the system.Internal and external zones are typically serviced from the same rooftop controller.As a result, the system may be exposed to conflicting mid-season heating andcooling demands. The conflicting demands are addressed with the heating andcooling lockouts, based on the outside air temperature at the rooftop controller.The heating or cooling action at the zone depends on how the rooftop controllertreats and calculates what is delivered to the zones. Many factors influence thedelivery and availability of hot or cold air to satisfy the current zone demand.Table 3 through Table 5 shows the rooftop controller system mode calculationbased on the highest demand of the zones, the average of the three highestdemands, or the average of the five highest demands.22TEC Zoning Control System for Stand-Alone and BACnet® MS/TP Networked ApplicationsTechnical Bulletin
Table 3: System Mode Calculation with Three Voting Zones (Example 1)Heat ActionVotingZone 1VotingZone 2VotingZone 3Current Heat Demand 50% 0% 0%Heat Weight Set 50% 100% 100%Resulting Heat Weight to Rooftop Controller 25% 0% 0%Highest Resulting Heat Weight of Three Zones 25%Average of Three Highest Resulting Heat Weights 8.3%Cool ActionVotingZone 1VotingZone 2VotingZone 3Current Cool Demand 0% 100% 100%Cool Weight Set 100% 100% 50%Resulting Cool Weight to Rooftop Controller 0% 100% 50%Highest Resulting Cool Weight of Three Zones 100%Average Cool Weight of Three Highest Zones 50%Table 3 shows that the resulting heat and cool weight used by the rooftop controllerfor the three voting zones is different, meaning different heating and cooling actionbased on the configuration of the rooftop controller.Table 4: System Mode Calculation with Three Voting Zones (Example 2)Heat ActionVotingZone 1VotingZone 2VotingZone 3Current Heat Demand 100% 0% 0%Heat Weight Set 100% 100% 100%Resulting Heat Weight to Rooftop Controller 100% 0% 0%Highest Resulting Heat Weight of Three Zones 100%Average of Three Highest Resulting Heat Weights 33.3%Cool ActionVotingZone 1VotingZone 2VotingZone 3Current Cool Demand 0% 100% 100%Cool Weight Set 100% 75% 75%Resulting Cool Weight to Rooftop Controller 0% 75% 75%Highest Resulting Cool Weight of Three Zones 75%Average Cool Weight of Three Highest Zones 50%Table 4 shows that the resulting heat and cool weight used by the rooftop controllerfor the three voting zones is different, meaning different heating and cooling actionbased on the configuration of the rooftop controller.• If the control type of the rooftop controller is set to the highest demand, theaction of the rooftop controller is heating.• If the control type of the rooftop controller is set to the average of the threehighest demands, the action of the rooftop controller is cooling.TEC Zoning Control System for Stand-Alone and BACnet® MS/TP Networked ApplicationsTechnical Bulletin23
Page 1 and 2: TEC Zoning Control System for Stand
Page 3 and 4: Sequence of Manual Status Display S
Page 5 and 6: TEC Zoning Control System for Stand
Page 7 and 8: Figure 1 illustrates a typical TEC
Page 9 and 10: Example: A typical installation may
Page 11 and 12: Bypass Damper Design RulesA bypass
Page 13 and 14: The zone controller automatically s
Page 15 and 16: Main User MenuUse the Main User Men
Page 17 and 18: Table 2: TEC2647Z-2 and TEC2647Z-2+
Page 19 and 20: Table 2: TEC2647Z-2 and TEC2647Z-2+
Page 21: Table 2: TEC2647Z-2 and TEC2647Z-2+
Page 25 and 26: Table 6: Lockout Level Function Det
Page 27 and 28: - It is possible for an internal zo
Page 29 and 30: Table 9: Maximum Heat Flow Adjustme
Page 31 and 32: Note that 0 to 100% is directly con
Page 33 and 34: Table 12: TEC2664Z-2 Rooftop Contro
Page 37 and 38: The rooftop controller calculates t
Page 39 and 40: Rooftop Controller Heating and Cool
Page 41 and 42: Typically, the number of rooftop co
Page 43 and 44: PIR Occupancy Sensor LogicThe PIR o
Page 45 and 46: AO2HeatingSetpointCoolingSetpointAO
Page 47 and 48: HeatingSetpointCoolingSetpointB05AO
Page 49 and 50: The system mode can be set to eithe
Page 51 and 52: 1. The outdoor temperature displays
Page 53 and 54: FIG:byps_dmprSequence of OperationF
Page 55 and 56: • Properly set the Min Pos, Max P
Page 57 and 58: Table 19: Rooftop Controller Commis
Page 59 and 60: Table 22: Zone Controller Number (
Page 61 and 62: Table 23: TEC2647Z-2 and TEC2647Z-2
Page 65: Table 24: TEC2664Z-2 Rooftop Contro
Page 69 and 70: • Ground the circuit if required.
Page 71 and 72: Table 25: Troubleshooting Details 1
Page 73 and 74:
Table 25: Troubleshooting Details 1
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