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

77 Pages·2011·1.01 MB·English

TEC Zoning Control System for Stand-Alone and
BACnet® MS/TP Networked Applications
Code No. LIT-12011682
Technical Bulletin
Issued May 13, 2011
TEC2647Z-3, TEC2647Z-3+PIR,
TEC2664Z-3
Refer to the QuickLIT Web site for the most up-to-date version of this document.
Document Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Related Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
System Overview and Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Initial Design Criteria Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Scalability and Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Local Zone Terminal Reheat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Exception Areas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Bypass Damper Design Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Setup and Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
TEC2647Z-3 and TEC2647Z-3+PIR Zone Controller Operation Overview . . . . . . . . . . 11
Zone Controller User Interface Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Backlit LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Light-Emitting Diodes (LEDs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Passive Infrared (PIR) Onboard Occupancy Sensor (TEC2647Z-3+PIR Model) . . . . . . . . 12
Status Display Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
PIR Onboard Occupancy Sensor Operation (TEC2647Z-3+PIR Model). . . . . . . . . . . . . . . 13
PIR Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Standby Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
TEC2664Z-3 Rooftop Controller Operation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Rooftop Controller User Interface Keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Light-Emitting Diodes (LEDs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Manual Scroll Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Main User Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Configuring the TEC2647Z-3 or TEC2647Z-3+PIR Zone Controller. . . . . . . . . . . . . . . . 16
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Monitoring Inputs BI2 and UI3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
TEC2647Z-3 and TEC2647Z-3+PIR Zone Controller Operation and Strategy. . . . . . . . 22
PIR Onboard Occupancy Sensor (TEC2647Z-3+PIR Model) . . . . . . . . . . . . . . . . . . . . . . . 23
Demand-Based Heating and Cooling System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Overrides and Zone Controller User Interface Lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Zone Setpoint Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Heating and Cooling Weight Zone Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Minimum, Maximum, and Heat Flow Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Minimum Position Adjustment (Min Pos Parameter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Maximum Position Adjustment (MaxPosParameter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Maximum Heat Flow Adjustment (MaxHTPosParameter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Balancing the Minimum, Maximum, and Heat Flow Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Terminal Reheat Lockout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Configuring the TEC2664Z-3 Rooftop Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Configuring Input DI1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
TEC2664Z-3 Rooftop Controller Operation and Strategy. . . . . . . . . . . . . . . . . . . . . . . . 37
Data Exchange Between the Rooftop Controller and the Zones. . . . . . . . . . . . . . . . . . . . . 38
Occupancy and Overrides. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Rooftop Controller User Interface Lockouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Rooftop Controller Heating and Cooling Supply Air Temperature Lockouts . . . . . . . . . . . . 39
Rooftop Controller Heating and Cooling Outside Air Temperature Lockouts . . . . . . . . . . . 40
Seasonal Changeover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Bypass Damper Control and Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
TEC2647Z-3 and TEC2647Z-3+PIR Zone Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
PIR Occupancy Sensor Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
PIR Occupancy Sensor Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
TEC2664Z-3 Rooftop Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
TEC2664Z-3 Rooftop Controller Operation and Strategy . . . . . . . . . . . . . . . . . . . . 50
Main User Menu Access Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Sequence of Auto Status Display Scrolling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
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Sequence of Manual Status Display Scrolling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
System Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Proper Commissioning of the Zone Controllers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Proper Commissioning of the Rooftop Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
System Operation Checklists. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
MS/TP Bus Objects When Networked with a Supervisory Controller. . . . . . . . . . . 61
TEC2647Z-3 and TEC2647Z-3+PIR Zone Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
TEC2664Z-3 Rooftop Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
MS/TP Device Mapping into an NAE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Adding a Zone Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Adding a Rooftop Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Adding Point Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Notes, Tips, and Things to Know. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Multiple 24 VAC Zone Controller Transformers versus a Single 24 VAC Zone Controller
Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Critical Point Checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Balancing and Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Occupancy Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Occupancy Schedule. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
NAE Engineering View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Troubleshooting a TEC Zoning Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
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TEC Zoning Control System for Stand-Alone and
BACnet® MS/TP Networked Applications
Technical Bulletin
Document Introduction
This document describes how to configure and commission a TECZoning Control
System for stand-alone and BACnet® Master-Slave/Token-Passing(MS/TP)
networked applications, including how to:
• map devices into a Network Automation Engine (NAE)
• add a zone controller and rooftop controller on a Metasys® network
• map the required zone controller and rooftop controller point objects
• operate the zone controller and rooftop controller user interface keys
• configure the zone controller and rooftop controller parameters via the Installer
Configuration Menu
• determine the sequence of operation of the zones
• initiate the rooftop controller Main User Menu
• determine the rooftop controller sequence of auto status display scrolling
• initiate the rooftop controller manual scroll display
• troubleshoot a TEC Zoning Control System
This document neither describes how to locate or install the TEC Zoning Control
System, nor how to wire the system. Refer to the appropriate zone controller and
rooftop controller installation instructions listed in Table 1 for more information on
these topics.
Related Documentation
See Table 1 for related documentation.
Table 1: TEC Zoning Control System Related Documentation (Part 1 of 2)
For Information On See Document LIT or Part Number
Applications, Features, and Benefits of TEC Zoning Control System for LIT-12011681
the TEC Zoning Control System Stand-Alone and BACnet MS/TP
Networked Applications Product Bulletin
Locating, Mounting, and Wiring TEC2647Z-3 and TEC2647Z-3+PIR Part No. 24-9890-1370
TEC2647Z-3 and TEC2647Z-3+PIR Zone BACnet MS/TP Zone Controllers for
Controllers Stand-Alone and Networked Zoning
Systems Installation Instructions
Locating, Mounting, and Wiring TEC2664Z-3 BACnet MS/TP Rooftop Part No. 24-9890-1362
TEC2664Z-3 Rooftop Controllers Controller for Stand-Alone and Networked
Zoning Systems Installation Instructions
Mounting and Wiring a TEC-7-PIR Passive Infrared (PIR) Accessory Covers Part No. 24-9890-870
Occupancy Sensor Zone Controller Installation Instructions
Cover
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Table 1: TEC Zoning Control System Related Documentation (Part 2 of 2)
For Information On See Document LIT or Part Number
Particular Options Specified in the Zoning System TEC2647Z-3 and LIT-12011683
BACnet Standard and Implemented in TEC2647Z-3+PIR Zone Controllers
the TEC2647Z-3 or TEC2647Z-3+PIR Protocol Implementation Conformance
Zone Controller Statement Technical Bulletin
Particular Options Specified in the Zoning System TEC2664Z-3 Rooftop LIT-12011684
BACnet Standard and Implemented in Controller Protocol Implementation
the TEC2664Z-3 Rooftop Controller Conformance Statement Technical Bulletin
Product Overview
IMPORTANT: The TEC Zoning Control System is intended to provide an
input to equipment under normal operating conditions. Where failure or
malfunction of the zoning control system could lead to personal injury or
property damage to the controlled equipment or other property, additional
precautions must be designed into the zoning control system. Incorporate and
maintain other devices, such as supervisory or alarm systems or safety or limit
controls, intended to warn of or protect against failure or malfunction of the
zoning control system.
The TEC Zoning Control System features a fully scalable network architecture
using BACnet MS/TP communication capability that operates with a supervisory
controller, or it can operate as a stand-alone system. This cost-effective zoning
control system provides efficient space temperature control for constant volume,
pressure-dependent systems in multi-zone heating and cooling applications.
The TEC Zoning Control System uses standard BACnet objects for automatic,
self-binding zone-controller-to-rooftop-controller configuration, communicating
in a peer-to-peer manner. Pre-configured sequences reduce the need for
programming and eliminate flash downloading. Plain text menus, backlit display,
and multiple interface keys make setup and operation quick and easy.
Figure 1 illustrates a typical TEC Zoning Control System installed on a
single MS/TP Bus. This installation consists of multiple TEC2647Z-3 or
TEC2647Z-3+PIR (onboard occupancy sensor) Zone Controllers, each controlling
a single zone damper; and a TEC2664Z-3 Rooftop Controller controlling a rooftop
unit. Optionally, the MS/TP Bus can be wired to a supervisory controller to
provide centralized monitoring and control of the system.
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Figure 1: Typical TEC Zoning Control System Installed on a Single MS/TP Bus
System Overview and Architecture
The TEC Zoning Control System is comprised of two terminal equipment
controller types, including:
• TEC2647Z-3 or TEC2647Z-3+PIR Zone Controller
• TEC2664Z-3 Rooftop Controller
Combined, this system delivers a simple yet efficient way to operate and control
pressure-dependent Variable Air Volume (VAV) zones with rooftop units.
Systemcontrol implementation is based on demand. The system is designed to
work with small- to medium-sized staged heating and cooling rooftop unit
equipment (2to20tons typical).
A local BACnet MS/TP Bus between all devices provides effective
communication and smooth data exchange of all required information between the
zone controllers and the rooftop controllers for proper system operation.
Integration into any BACnet supervision system is seamless.
The zone controller and rooftop controller feature a backlit Liquid Crystal Display
(LCD) with dedicated function menu buttons for simple user operation. Accurate
temperature control is achieved through a unique, Proportional-Integral (PI)
time-proportioning algorithm that virtually eliminates temperature offset
associated with traditional, differential-based thermostats.
The zone controller is specifically designed for local pressure-dependent VAV
zone control within JohnsonControls® zoning system product family. The
primary damper output uses an off-the-shelf, standard 0 to 10 VDC VAV actuator
for control.
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The zone controller is available with or without a factory-installed occupancy
sensor cover. The zone controller is also compatible with an accessory
JohnsonControls TEC-7-PIR Occupancy Sensor Cover. A zone controller
equipped with the occupancy sensor cover provides advanced active occupancy
logic that automatically switches occupancy levels from occupied to standby as
required, when motion is sensed. This feature results in incremental energy savings
during scheduled occupied periods when the space is unoccupied, without
sacrificing occupant comfort.
The rooftop controller is specifically designed for equipment control, based on the
demands of the zone. The rooftop controller provides single- or multi-stage control
of heating and cooling equipment, such as rooftop and self-contained units used in
zoning control systems. The rooftop controller includes an extra digital input that
monitors filter status or as a general-purpose service indicator. A Single-Pole,
Single-Throw (SPST) auxiliary contact controls lighting or disables the rooftop
controller economizer function during unoccupied periods. Also included is a
discharge air sensor input. Proportional input and output static pressure logic is
integrated into the rooftop controller design, to provide bypass damper control.
The TEC Zoning Control System requires a minimum of a single zone controller
and a single rooftop controller to operate properly. A typical application includes
multiple zone controllers addressed to a single rooftop controller.
The following is required for proper zone controller operation, and must be
provided separately:
• 24 VAC power supply, dedicated to the zone(s)
• analog 0 to 10 VDC pressure-dependent electric actuator
• terminal reheat (if required by the design)
• proper wiring of all components, per the installation instructions
• proper network wires fed for each device
The following is required for proper rooftop controller operation, and must be
provided separately:
• 24 VAC power supply, typically taken directly from the rooftop unit power
supply (C and RC)
• outdoor air sensor
• supply air duct sensor
• return air duct sensor
• 0 to 5 VDC static pressure sensor/transducer
• analog 0 to 10 VDC bypass damper actuator (spring return or non-spring
return)
• proper wiring of all components, per the installation instructions
• proper network wiring
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As an example of network configuration, a typical installation may include three
rooftop controllers, controlling 28 zones, for a total of 31 nodes (individual Comm
addresses). One rooftop controller would have 9 zones under its command, another
rooftop controller would also have 9 zones under its command, and a third rooftop
controller would have 10zones under its command.
Initial Design Criteria Considerations
The designer and installer of the TEC Zoning Control System must:
• size the installed equipment for the properly calculated heating and cooling
peak loads. Oversizing the installed capacity more than what is required is not
advantageous, as it simply leads to short cycling of the equipment during small
load periods.
• properly size and lay out the duct work (including the bypass damper) in
accordance with local, national, and regional regulations.
IMPORTANT: The TEC Zoning Control System is a low static pressure
system. Design its application in your HVAC system so that potential failure of
the bypass damper subsystem does not cause failure of the ducts.
• properly size the capacity of the zone versus its true requirements. Square
footage calculations can cause the installed total deliverable load to be
insufficient for the actual use of an area (for example, a conference room,
computer room, or a cafeteria).
Although the TEC Zoning Control System does not correct for a wrong initial
mechanical layout and associated load calculations, the control system does
dramatically help deliver the load required by voting zones. The control system
accomplishes the delivery by appropriately distributing the total available capacity
of the installed equipment to the required voting zones. If the equipment is
undersized for the peak load, the control system distributes the available capacity
according to the priorities requested, to improve the comfort level of the majority
of zones.
Proper planning and design plays a critical role in getting an installation up and
running faster, and with fewer service calls during the initial occupancy period.
Scalability and Limitations
The TEC Zoning Control System is fully scalable in terms of the number of zone
controllers and rooftop controllers used on the same MS/TP Communications Bus.
For more details on wiring to the MS/TP Bus, refer to the MS/TP Communications
Bus Technical Bulletin (LIT-12011034).
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Local Zone Terminal Reheat
The need for terminal reheat depends on the specific application. As a general rule,
including terminal reheat in a VAV system always results in better occupancy
comfort; however, it may not be practical from a cost standpoint or for regional
load requirements. System designs vary widely from north to south and east to
west because of regional peak load requirements.
In colder climates, VAV system heating operation without terminal reheat typically
results in colder walls on the outer perimeter of the zone. Although the dry bulb
temperature of the zone is well maintained, occupants may be uncomfortable
simply because of the lower outer wall temperature. In addition, heating delivery
from the ceiling in outside zones is not as efficient as heating delivery directly
where the losses occur, such as when a perimeter electric baseboard or a perimeter
hydronic baseboard is used.
In regions where the heating load is low and only required for a short period of the
year, a properly sized VAV system can deliver the required heating comfort
without the use of terminal reheat. Ideally, the design of the ductwork and area
diffusers should be the most efficient arrangement possible, with the heating
delivery concentrated close to the outer walls of the zone.
In problematic situations where efficient heating delivery is an issue, fan powered
VAV systems can reduce occupancy discomfort by providing a constant flow to the
zones, to maximize heating delivery.
Exception Areas
An office installation typically requires that a single VAV system service multiple
areas or zones. These areas are likely a mix of internal and external zones. Verify
the requirements of each zone to determine a true total peak load before
committing to a final VAV system design and size.
It may be necessary to intentionally oversize or undersize the VAV system to meet
the daily load demands. The following are examples where oversizing may be
required:
• areas with large windows that are exposed to the sun for long periods of time
• conference rooms
• cafeterias
• areas with vending machines
• areas with extra lighting
• areas with computers, photocopiers, and other electronic office equipment
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