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

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Maximum Position Adjustment (Max Pos Parameter)This parameter sets the maximum position of the zone damper to deliver themaximum amount of hot or cold air to the zone in all conditions. When poweredup, the damper never opens above the maximum position setting.Note: Use the Max Pos parameter to set the maximum amount of hot airdelivered to the zone; not the MaxHTPos parameter. See Maximum HeatFlow Adjustment (MaxHTPos Parameter) on page 28 for a description ofthe MaxHTPos parameter.The Max Pos parameter is also used to set the maximum amount of cold airdelivered to the zone.Maximum Heat Flow Adjustment (MaxHTPos Parameter)Many assume the MaxHTPos parameter sets the maximum amount of hot airdelivered to the zone, but that is not a correct assumption. Instead, the Max Posparameter sets both the maximum amount of hot air and the maximum amount ofcold air delivered to the zone. See Maximum Position Adjustment(Max Pos Parameter) on page 28 for a description of the Max Pos parameter.The MaxHTPos parameter sets the minimum heating position of the zone damper,to maximize hot airflow on a call for reheat with cold supply air. The MaxHTPosfunction is only used if the local reheat configuration (RehtConf parameter) is setto any value other than (0): None (no local reheat). Table 9 includes the maximumheat flow adjustments for the various reheat stages and reheat output time bases.Table 9: Maximum Heat Flow Adjustment (Part 1 of 2)Reheat Stage(RehtConfParameter)Time Base forReheat Output(BO5 TimeParameter)Maximum Heat Flow Adjustment(MaxHTPos Parameter)(0): None N/A Leave the maximum heat flow at its default setting of30%, or adjust it to any other setting. The maximumheat flow adjustment is not used in this scenario.(1): Analog DuctReheat OnlyN/AAdjust the maximum heat flow to any value higher thanthe current selected minimum position.Example: The minimum airflow is set at 25% and themaximum heat flow is set at 75%. If the primary air iscold, when the PI heating loop (and analog output)goes from 0 to 100%, the zone damper moves linearlyfrom 25 to 75% open.28TEC Zoning Control System for Stand-Alone and BACnet® MS/TP Networked ApplicationsTechnical Bulletin
Table 9: Maximum Heat Flow Adjustment (Part 2 of 2)Reheat Stage(RehtConfParameter)(2): On/Off DuctReheat Only(3): On/OffPeripheral ReheatOnly(4): Analog DuctReheat and On/OffPeripheral ReheatTime Base forReheat Output(BO5 TimeParameter)(0): 15 Minutes(Four Cycles perHour)(1): 10 Seconds(Six Cycles perHour) for SolidState Relays(0): 15 Minutes(Four Cycles perHour)(1): 10 Seconds(Six Cycles perHour) for SolidState RelaysN/AMaximum Heat Flow Adjustment(MaxHTPos Parameter)Adjust the maximum heat flow to any value higher thanthe current selected minimum position.Example: The minimum airflow is set at 25% and themaximum heat flow is set at 75%. If the primary air iscold, when the BO5 output is energized on a call forheat, the zone damper moves directly from 25% opento 75% open. As soon as the BO5 output isde-energized, the zone damper returns to 25% open.Adjust the maximum heat flow to any value higher thanthe current selected minimum position.Example: The minimum airflow is set at 25% and themaximum heat flow is set at 75%. If the primary air iscold, when the BO5 output is energized on a call forheat, the zone damper moves directly from 25% opento 75% open. As soon as the BO5 output isde-energized, the zone damper returns to 25% open.Leave the maximum heat flow at its default setting of30%, or adjust it to any other setting. The maximumheat flow adjustment is not used in this scenario.Leave the maximum heat flow at its default setting of30%, or adjust it to any other setting. The maximumheat flow adjustment is not used in this scenario.Adjust the maximum heat flow to any value higher thanthe current selected minimum position.Example: The minimum airflow is set at 25% and themaximum heat flow is set at 75%. If the primary air iscold, when the PI heating loop (and analog output)goes from 0 to 100%, the zone damper moves linearlyfrom 25 to 75% open.The selected minimum position of the zone damper has a direct impact on thetemperature stability within certain zones. Having a minimum position selectedcan produce an overcooling and/or overheating effect. This effect is created by theminimum position, when the primary air temperature is in the opposite mode thanwhat the zone currently requires (for example, an internal zone that is calling forcooling in the winter, while the rooftop controller is supplying hot air for theexternal zones).Depending on the application, setting a minimum position for a zone damper maybe mandatory. Eliminating this minimum position, or at least lowering it to a valuebelow the standard, may resolve certain system design issues. A good example ofthis is an internal zone with a grossly oversized VAV unit.Balancing the Minimum, Maximum, and Heat Flow ValuesTo balance the minimum airflow:1. Set the outside heating lockout value (H lock parameter) at the rooftopcontroller to ensure that local system heating is allowed.TEC Zoning Control System for Stand-Alone and BACnet® MS/TP Networked ApplicationsTechnical Bulletin29
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: - It is possible for an internal zo
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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