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

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2. Check that the system is in the heating mode. To do so, press the SCROLLbutton on the rooftop controller to show the local Zone Sequence = Heatprompt.3. Adjust the appropriate setpoints to ensure that the voting zones call for heating.4. Adjust the local setpoint of the currently balanced zone controller to itsminimum value (for example, 60°F [16°C] or at least 7 to 8F° [3.5 to 4C°]lower than the current room temperature), to drive the zone damper to itsminimum position.5. Set the Min Pos parameter to the desired value, as required to balance theminimum airflow.To balance the maximum airflow:1. Set the outside heating lockout value (H lock parameter) at the rooftopcontroller to ensure that local system heating is allowed.2. Check that the system is in the heating mode. To do so, press the SCROLLbutton on the rooftop controller to show the local Zone Sequence = Heatprompt.3. Adjust the appropriate setpoints to ensure that the voting zones call for heating.4. Adjust the local setpoint of the currently balanced zone controller to itsmaximum value (for example, 80°F [27°C] or at least 7 to 8F° [3.5 to 4C°]higher than the current room temperature), to drive the zone damper to itsmaximum position.5. Set the Max Pos parameter to the desired value, as required to balance themaximum airflow.To balance the maximum heat flow:1. Set the outside cooling lockout value (C lock parameter) at the rooftopcontroller to ensure that local system cooling is allowed.2. Set the outside reheat lockout value (AO2 OALK or BO5 OALK parameter)at the zone controller to ensure that local reheat is allowed.3. Check that the system is in the cooling mode. To do so, press the SCROLLbutton on the rooftop controller to show the local Zone Sequence = Coolprompt.4. Adjust the appropriate setpoints to ensure that the voting zones call for cooling.5. Adjust the local setpoint of the currently balanced zone controller to itsmaximum value (for example, 80°F [27°C] or at least 7 to 8F° [3.5 to 4C°]higher than the current room temperature), to drive the zone damper to itsminimum position.6. Set the MaxHTPos parameter to the desired value, as required to balance themaximum heat flow.30TEC Zoning Control System for Stand-Alone and BACnet® MS/TP Networked ApplicationsTechnical Bulletin
Note that 0 to 100% is directly converted to 0 to 10 VDC on the VAV damperoutput. If the actuator has a input range of 2 to 10 VDC, then entering 50%minimum position is not directly converted to 50% VAV damper position. SeeTable 10 for the VAV damper position based on the actuator input range.Table 10: VAV Damper PositionActuatorVAV Damper PositionInput Range0% 10% 20% 30% 40% 50% 60% 70% 80% 100%0 to 10 VDC 0% 10% 20% 30% 40% 50% 60% 70% 80% 100%2 to 10 VDC 0 to 20% 28% 36% 44% 52% 60% 68% 76% 84% 100%The damper position is never linear and proportional to the airflow in apressure-dependent application. Depending on how the zone damper is sized, aVAV box can be, at best, slightly oversized or slightly undersized. In all instances,the PI loop of the zone controller compensates to determine the proper damperposition that satisfies the current zone demand. Figure 4 illustrates the relationshipbetween damper position and airflow for oversized and undersized VAV boxes.AirflowAirflowUndersized VAV BoxEffectiveControlAreaEffectiveControlAreaOversized VAV Box% Open% OpenFIG: efctv_cntrl_arNote: Be certain that the actuator is installed and set up properly so the blades ofthe VAV damper can rotate from the fully open to the fully closed positionwith no mechanical interference. To accomplish this, use the positionsettings on the zone controller.Terminal Reheat LockoutFigure 4: Effective Control AreaIt is desirable to lock out the local terminal reheat of the zones during the summermonths when reheat is not required. Locking out the local terminal reheat preventscalls for local reheat simply based on a configured outside air temperature value.Table 11 includes the terminal reheat lockout adjustments for the various reheatstages.Table 11: Terminal Reheat Lockout Adjustment (Part 1 of 2)Reheat Stage (RehtConfParameter)Analog Reheat Stage(AO2 OALK Parameter)On/Off Reheat Stage(BO5 OALK Parameter)(0): None N/A N/A(1): Analog Duct Reheat Only Set the analog reheat stageto the desired temperature.N/ATEC Zoning Control System for Stand-Alone and BACnet® MS/TP Networked ApplicationsTechnical Bulletin31
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 23 and 24: Table 3: System Mode Calculation wi
Page 25 and 26: Table 6: Lockout Level Function Det
Page 27 and 28: - It is possible for an internal zo
Page 29: Table 9: Maximum Heat Flow Adjustme
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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