Specs_23_09_23_4.pdf

FY13 Dormitory (48 Person), Thule AB, Greenland THULE48

SECTION 23 09 23.13 20

BACnet DIRECT DIGITAL CONTROL SYSTEMS FOR HVAC 04/07

PART 1 GENERAL

1.1 SUMMARY

A. The control system shall be an addition to the existing Energy Management and Control System (BAS) currently being operated in the Thule Air Force Base. The existing BAS is based on Trend Controls System.

B. Furnish a BACnet-based Building Automation System (BAS) to remotely monitor the status of equipment and/or conditions of spaces within the facility in accordance with this specification. Provide all necessary hardware, software and control devices to comply with the control diagrams and BAS Point Function Schedule shown on the mechanical drawings. The Building Controllers (BC), Advanced Application Controllers (AAC), and all input/output devices shall communicate using the protocols and network standards as defined by ASHRAE 135, BACnet. In other words, all controllers, with exception of controllers provided by the unit manufacturers, shall be BACnet devices. The building controller(s) shall connect the local BAS to the existing Energy Management and Control System ( BAS) server via Wide Area Network (WAN). The existing BAS server is based on a Trend Controls system and located at Building 1411.The new BAS shall interact with the existing BAS server, so that the monitoring points in the buildings are accessible from the existing BAS server with appropriate privilege via WAN.

1. Provide BC and AAC for control of HVAC equipment including but not limited to air handling units, exhaust fans, and heating hot water system.

2. The existing Thule Air Force Base BAS server (located at Building 1411) shall communicate with control system devices installed under this project using BACnet over IP (BACnet/IP). The contractor shall be responsible for making any modifications to the existing Trend Controls system, which will be necessary to facilitate communications between the BAS system and the new BAS in the facility. The contractor shall also be responsible for creating and installing the graphic screens for existing BAS server.

3. Each BC, AAC, and network hardware, such as Ethernet switch and router provided for the BAS, shall be provided with an Uninterruptible Power Supply (UPS) that can supply electrical power to the attached load. The UPS shall be sized such that the controllers and network devices remain active during the power failure for at least two hours.

4. Any software provided shall be of the latest available version for the BAS installed at the base.

5. BC and AAC shall be capable of accepting analog and digital inputs and shall provide analog and digital outputs in accordance with the control diagrams and the "BAS Point Function Schedule."

6. The existing BAS server and BC shall communicate using the IP

SECTION 23 09 23.13 20 Page 1 network (Ethernet drop points for BC by Division 26). BC and all controllers shall communicate using the BACnet protocol via BACnet

MS/TP.

7. The contractor shall be responsible for providing programming and programming modifications necessary to implement this project in the Trend Controls system running on the existing BAS server.

8. Provide BAS control wiring and conduit for this system as described in Part 3, '3.2 Electrical Installation' of this Section. 120 VAC power circuits are provided for BCs and AACs under Division 26 as shown on the electrical plans. The control system installer shall make connections as necessary to complete the system. Coordinate requirements with Division 26 and the Contracting Officer.

9. Provide for connecting six (6) thermistor strings to the BAS to allow remote reading of permafrost soil temperatures. The thermistor strings shall be provided and installed by Division 31, and as shown on Civil Drawings C-103, C-304, and Mechanical Drawing M-706. Each thermistor string shall be provided with 12 thermistors at 300 mm spacing, with all wire pairs bound into one cable. All permafrost soil temperature information shall be stored at the Supervisory Server for reporting, trend logging, archiving, and report printing. Provide.new front end graphic display screens to display this monitoring and logging of information.

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

AIR MOVEMENT AND CONTROL ASSOCIATION INTERNATIONAL (AMCA)

AMCA 500-D (1998) Laboratory Methods of Testing Dampers for Rating

AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING

ENGINEERS (ASHRAE)

ASHRAE 135 (2004) BACnet - Data Communication Protocol for Building Automation and Control Networks, including all published addenda

U.S. FEDERAL COMMUNICATIONS COMMISSION (FCC)

FCC EMC (2002) FCC Electromagnetic Compliance Requirements

UNDERWRITERS LABORATORIES (UL)

UL 486A-486B (2003; R 2004 thru 2009) Standard for Wire Connectors

SECTION 23 09 23.13 20 Page 2

1.3 DEFINITIONS

1.3.1 Modulating Control

Direct digital closed loop Proportional + Integral (PI) control which maintains the controlled variable (temperature, humidity, etc.) at a set point by adjusting the position of a valve, damper or similar controlled device in small increments and decrements between fully open and fully closed positions. PI loop shall include an adjustable dead band, which is a range of the controlled variable around the set point in which no change in output to the controlled device is made. Dead bands shall be initially set at plus or minus 0.5 deg C for temperature control loops and plus or minus 2 percent RH for humidity control loops.

1.3.2 2-Position Control

On/off control in which the controlled device is either fully open or fully closed with no intermediate operating positions available.

1.3.3 Advanced Application Controller (AAC)

The ACC is a fully programmable control module. This control module may be capable of some of the advanced features found in Building Controllers (storing trends, initiating read and write requests, etc.) but it does not serve as a master controller. Advanced Application Controllers may reside on either the Ethernet/IP backbone or on a subnet.

1.3.4 BACnet/IP

An approved BACnet network type, which uses an Ethernet carrier and Internet Protocol (IP) addressing.

1.3.5 BACnet MS/TP

An approved BACnet network type, which uses a Master-Slave Token Passing configuration. MS/TP networks are unique to BACnet and utilize EIA 485 twisted pair topology running at 9600 to 76,800 bps.

1.3.6 BACnet over ARCNET

An approved BACnet network type, which uses an ARCNET (attached resource computer network) carrier. ARCNET is an industry standard that can utilize several speeds and wiring standards. The most common configuration used by BACnet controllers is an EIA 485 twisted pair topology running at 156,000 bps.

1.3.7 Building Controller (BC)

A fully programmable control module, which is capable of storing trends and schedules, serving as a router to devices on a subnet, and initiating read and write requests to other controllers. Typically this controller is located on the Ethernet/IP backbone of the DDCS. In many vendors' architectures a Building Controller will serve as a master controller, storing schedules and trends for controllers on a subnet underneath the Building Controller.

1.3.8 PICS - Protocol Implementation Conformance Statement

A written document, created by the manufacturer of a device, which

SECTION 23 09 23.13 20 Page 3 identifies the particular options specified by BACnet that are implemented in the device.

1.4 SYSTEM DESCRIPTION

A. Provide and install a distributed logic Building Automation System complete with software and hardware functions required. Provide a complete control system including BACnet controllers, raceways, wiring, temperature and humidity sensing elements, flow and pressure sensing elements, element wells and relays. Non-BACnet-compliant or proprietary equipment or systems (including gateways) shall not be acceptable and are specifically prohibited.

B. The BAS application program shall be written to communicate specifically utilizing BACnet protocols. Software shall include password protection, scheduling (including optimum start), alarming, logging of historical data, full graphics including: animation, after-hours billing program, demand limiting, full suite of field engineering tools including graphical programming and applications. Systems, which do not utilize BACnet protocols, are strictly prohibited.

C. Control system hardware consists of sensors, indicators, actuators, final control elements, interface equipment, other apparatus, and accessories connected to controllers to operate mechanical systems according to sequences of operation specified.

D. Control system software consists of control software, communication software, alarm reporting software, and graphical operator interface software, programmed to operate mechanical systems according to Sequences of Operation specified.

1.5 SEQUENCE OF OPERATIONS

1.5.1 Point List

See the "System Point List" (Input/Output Chart) shown under Mechanical drawings for a list of required hardware points and associated software functions. Points (physical, software, calculated, etc.) required to perform the specified Sequence of Operation, but not listed, shall be provided.

1.5.2 Space Static Pressure Monitoring

Space Static Pressure Monitoring (AHU-1,2, and 3):

The EMCS shall monitor the static pressure in the space served, andwhen the space static pressure drops below the set point, initially set at 12 Pa (adjustable) for 10 consecutive minutes, an alarm shall be generated at the EMCS and when the space static pressure rises above the set point, initially set at 20 Pa (adjustable) for 10 consecutive minutes, an alarm shall be generated at the EMCS.

1.5.3 Space Temperature Control

The space temperature shall be controlled via individual unit heaters with local thermostats.

1.5.4 Discharge Temperature Control

The unit's discharge air temperature control shall be set as indicated in

SECTION 23 09 23.13 20 Page 4 the Mechanical drawings (adjustable).

1.5.5 Energy Recovery Wheel Control

When the unit is off, the energy recovery wheel shall be disabled. When the unit is on, the energy recovery wheel shall operate as described below.

1. Energy Recovery Wheel Hand-Off-Auto Operation: Hand-Off-Auto settings shall be provided as part of the step motor controller/variable frequency drive through the drive's keypad. In the Off mode, the wheel shall be stopped. In the Hand mode, the wheel shall run continuously. In the Auto mode, the wheel shall be enabled by the BAS to run when respective unit is operational and proven operating by supply fan and exhaust fan run status.

2. Energy Recovery Wheel Automatic Mode: The energy recovery wheel shall operate in two modes of operation: supply temperature control mode and frost control mode.

A. Supply air temperature control: When the unit is indexed ON the BAS shall energize the heat recovery wheel. Entering and leaving temperatures of supply and exhaust air streams shall be monitored by the BAS. Wheel speed shall be modulated to maintain the supply air temperature set point.

Upon an increase of supply air temperature above set point, the wheel speed shall decrease to maintain the supply air temperature set point. Upon a decrease of supply air temperature below the set point, the wheel speed shall increase to maintain the supply air temperature set point. If the supply air temperature set point is not achieved with the heat wheel for 10 consecutive minutes (adjustable), then additional heating is acquired by opening the primary heating coil valve. The BAS shall modulate the primary heating coil valve to maintain supply air temperature set point. Upon an increase of supply air temperature for 10 consecutive minutes (adjustable), the primary heating coil valve output shall modulate down to 0 percent (to close coil valve).

B. Frost control mode: When the exhaust air outlet temperature sensor is less than the frost set point of minus 15 deg C (adjustable), BAS shall override the supply air temperature control.

B1. The wheel speed shall be modulated to maintain the exhaust air outlet temperature sensor at set point. If the exhaust air outlet temperature set point is not achieved with the heat wheel for 10 consecutive minutes (adjustable), then BAS shall modulate the defrost coil valve to maintain the exhaust air outlet temperature set point. Upon an increase of exhaust air outlet temperature for 10 consecutive minutes (adjustable), the defrost coil valve output shall modulate down to 0 percent (to close coil valve).

B2. If outside air temperature entering of the supply side of the energy wheel falls to minus 25 deg C for more than 10 minutes, heat wheel rotation shall stop. Resume normal discharge air temperature control when outside air temperature entering is above minus 20 deg C for more than 10 minutes.

3. Energy Recovery Wheel Proof: A digital output from the step motor controller/VFD shall provide operating status of the heat wheel to the BAS and use the status indication to accumulate run time. If the heat wheel does not start after a 60 second (adjustable) time delay, a failure alarm shall be issued and the heat wheel start command shall be canceled.

SECTION 23 09 23.13 20 Page 5

1.5.6 Dirty Filter Alarm

Differential pressure switch shall monitor the pressure drop at the outdoor and exhaust air filters. When the pressure at the filter exceeds an adjustable limit, an alarm signal will be sent to the BAS.

1.5.7 Unit Safeties

1. High Pressure Alarm: High static pressure safety switch on supply fan discharge and low static pressure safety switch on exhaust fan suction side shall be directly wired through motor control circuit (VFD or bypass starter) to shut down unit immediately and close outdoor and exhaust air dampers to prevent over pressurizing or collapsing ductwork if control system fails. Status of each pressure switch shall be reported to BAS.

Pressure switch must be manually reset before air handling unit can be started. Initial set point for high static pressure switch is plus 1 kPa (adjustable) and for low static pressure switch is minus 1 kPa (adjustable).

2. Freeze Alarm: Low temperature switch located at the entering side of primary heating coil shall be directly wired through motor control circuit to stop air handling unit and close outdoor air damper and exhaust air damper when a freeze condition occurs at the freezestat. An alarm shall be generated to in the BAS. The freezestat shall be set to trip at 2 deg C (manually adjustable) and must be manually reset at the freezestat.

3. Smoke Alarm: When particles of combustion are sensed by the supply air duct smoke detector provided under Division 28, a duct smoke alarm signal shall be sent to the fire alarm system. Upon receiving an alarm signal from duct smoke detector, the fire alarm system shall activate a Control Module (CM) to stop supply and exhaust fans. When the fire alarm condition has been cleared and the fire alarm system has been reset, the unit shall be returned to normal operation.

1.5.8 Failure Mode

Upon loss of control signal or electrical power the control devices shall fail in the manner indicated in the Input/Output Chart indicated in the Mechanical Drawings.

1.5.9 Additional Monitoring

In addition to the points mentioned in these sequences provide the additional monitoring points listed in the Input/Output Chart.

1.5.10 Hot Water Unit Heater

The hot water unit heater shall be controlled by a wall mounted thermostat, not through the BAS. When the temperature drops below the wall mounted thermostat set point, initially set at 19 deg C (adjustable), the thermostat shall enable the fan and modulate the hot water valve to maintain temperature set point. When the temperature rises above the set point, the hot water valve shall modulate closed and fan shall stop. The hot water valve shall fail open.

1.5.11 Flat Panel Radiator

The flat panel radiator shall be controlled by a non-electric thermostatic

SECTION 23 09 23.13 20 Page 6 actuator with integrated temperature sensor provided by the unit supplier as specified in section 23 57 10. 00 10, "Force Hot Water Heating System Using Hot Water and Steam Heat Exchangers". The non-electric thermostatic actuator shall be installed directly on valve body and modulate hot water flow through valve in response to room temperature changes.

1.5.12 Industrial Equipment System

The industrial equipment shall be controlled by a control panel provided by the industrial equipment manufacturer as specified in Section 23 35 19.00 20, "Industrial Ventilation and Exhaust." Once the industrial equipment is enabled, the equipment shall be controlled by its packaged controls. The BAS shall monitor the exhaust fan status and filter maintenance alarm from industrial equipment control panel.

1.5.13 Domestic Water, BTU Meter, and Electric Meter Monitoring

The EMCS shall monitor domestic water, BTU Energy, and Electric consumption through the BAS and EMCS via BACnet communication interface provided by the meter manufacturer. All meter information shall be stored at the Supervisory Server for reporting, trend logging, archiving, and report printing.

1.6 SUBMITTALS

Submit detailed and annotated manufacturer's data, drawings, and specification sheets for each item listed, that clearly show compliance with the project specifications.

Drawings shall be prepared using a Computer Aided Design (CAD) system.

Submittal shall be provided on half size drawings. Upon successful installation, as-built drawings shall be delivered to the Government on CD ROM in DXF or VSD compatible electronic format, as well as on full size drawings. Drawings prepared for or used for this work shall become the property of the Government. The Government reserves the right to reproduce, in part or whole, the delivered drawings for internal purposes.

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for Contractor Quality Control approval. Submit the following according to 01 33 00 SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Submit a control diagram as part of pre-construction submittal data for each system on an individual and separate sheet complete with a bill of material, a sequence of operation in a text format and tagging information. The diagram shall consist of a system flow diagram showing the location of each control device, a control schematic drawing showing the function of each item, scale drawings of the panel layouts of both inside and face plate, and a complete terminal drawing for electrical devices connected with the system controls. Submit "BAS Point Function Schedule" with the control diagram. In addition to the above requirements, submittals shall include:

Control Diagram; G, RO

Control diagram with required variables, air flow diagrams, ladder diagrams, and wiring diagrams. Control diagrams shall include at

SECTION 23 09 23.13 20 Page 7 least the following: set points, reset ranges, throttling ranges, differentials, operating ranges, normal positions, controller action, dial ranges, voltage, currents, mounting locations, indicators, and terminal strip points.

Component wiring diagrams; G, RO

Submit complete, detailed control and interlock wiring diagrams.

Show mechanical and electrical equipment furnished and all electrical interlocks, indicating terminal designation for all equipment. Respective equipment manufacturers shall furnish, through the supplier, approved drawings of equipment to be incorporated in this diagram. Clearly differentiate between factory-installed and field-installed wiring (Coordinate with Division 26).

BACnet communication architecture schematic; G, RO

Communication cable installation plans showing BAS server location, controller locations, hub locations, switch locations, router locations, and communication cable conductors and routing, distinguishing between different forms of media (i.e. Fiber, Category 5e, shielded twisted pair, coaxial cable, etc.).

Various types of LANs shall be identified and distinguished from each other. Each LAN shall be labeled according to its designated LAN address.

List of I/O Points; G, RO

Provide device tag schedule that at a minimum indicates device type, tag identifier, terminal connection points for wiring on the controller, BAS software point name, complete BAS point address and BAS expanded point descriptor. A separate listing shall be provided for each BC and AAC. Device tags used shall be the same as those used in the contract documents as shown on the associated flow control diagrams and the "BAS Point Function Schedule". BAS software point names and associated BAS expanded point descriptors shall incorporate the device tags used.

Damper Schedule; G, RO

Provide damper and actuator information schedule, including size, manufacturer, model number, normal positions of spring return damper, and other items required to properly install and maintain dampers.

Valve Schedule; G, RO

Provide valve and actuator information schedule, including size, Cv, design flow, design pressure drop, manufacturer, model number, close-off rating, normal positions of spring valves, and other items required to properly install and maintain valves.

Sequence of Operation; G, RO

As a minimum, all control processes that are controlled by a digital signal shall be clearly shown in a text narrative form.

Sequences shall be written in the contractor's own words in order to demonstrate a clear understanding of how the system is to

SECTION 23 09 23.13 20 Page 8 operate and be specific to the control system equipment used.

Copying or duplication of the sequences presented in this specification is not acceptable.

Bill of Materials; G, RO

Provide a complete listing of all parts and materials utilized.

List shall include part name, original manufacturer of part and original manufacturer's part number.

SD-03 Product Data; G, RO

Submit the data sheets as part of pre-construction submittal data supplied by the original manufacturer of the item. These documents include salient characteristics and shall be included in a special section of the instruction book titled Manufacturer's Literature:

a. Technical specification data for each type of product specified: Include manufacturers technical product data for each control device furnished, indicating dimensions, capacities, performance characteristics, electrical characteristics, finishes of materials, installation instructions, startup instructions, and maintenance instructions.

b. Technical specification data sheets for raceway, wire, cable and installation materials.

c. Technical specification data sheets for each software module, including the system theory.

SD-06 Test Reports

Test Plan; G, RO

Installation Inspection Report; G, RO

SD-07 Certificates

Installer Qualifications; G, RO

Submit resume listing installer's qualifications as part of pre-construction submittal data including manufacturer's certification as an approved system installer and a list of recently completed projects demonstrating 2 years of system installation experience. Provide name(s), address, and telephone numbers for installer supervisory personnel.

Startup Personnel Qualifications; G, RO

Submit resume listing startup personnel qualifications as part of pre-construction submittal data including manufacturer's certification as an approved system technician and a list of recently completed projects demonstrating 2 years of system startup experience. Provide name(s), address, and telephone numbers for supervisory personnel.

Control System Qualifications; G, RO

Submit a list of no less than three (3) projects as part of

SECTION 23 09 23.13 20 Page 9 pre-construction submittal data, which have similar BACnet based BAS system installed by the contractor. These projects must be fully completed and functional such that they can be observed the system in full operation. The BAS hardware and software components must be primarily engaged in the BACnet based systems, and must have been so for a minimum of three (3) years.

SD-10 Operation and Maintenance Data

Comply with requirements for data packages in Section 01 78 23OPERATION AND MAINTENANCE DATA, except as supplemented and modified in this specification.

Prepare and distribute six copies of the operations and maintenance data as part of as built data. The Operation and Maintenance Manual must include all information required during the submittal process, updated to reflect the final conditions at the end of construction. In addition, provide the following:

a. General troubleshooting and repair instructions.

b. Specific, explicit installation, troubleshooting, calibration, and repair instructions for each sensor, controller, interface device and controlled device.

c. Specific, explicit instructions for operation of each sensor, controller, interface device and controlled device.

d. Maintenance instructions and spare parts lists for each type of control device.

e. Interconnection wiring diagrams with identified and numbered system components and devices.

f. Keyboard illustrations and step-by-step procedures indexed for each operator function.

g. Inspection period, cleaning methods, cleaning materials recommended, and calibration tolerances.

h. Calibration records, list of set points, differentials, alarm limits, alarm instructions, and time schedules.

i. Sequence of operation in computer flow chart format. The flow chart shall show how each control action is derived.

SD-11 Closeout Submittals

Training Aids; G, RO

As Built Documentation; G, RO

Software, Firmware and Hardware Documentation; G, RO

1.7 QUALITY ASSURANCE

1.7.1 Installer Qualifications

Engage an Installer specializing in control system installations with a

SECTION 23 09 23.13 20 Page 10 minimum of 2 years of experience installing systems of similar type, size and complexity. Control system manufacturer shall certify that installer has been trained on the proper installation of this type of system and is an approved system installer.

1.7.2 Startup Personnel Qualifications

Engage specially trained personnel in direct employ of manufacturer of primary temperature control system with a minimum of 2 years of experience programming, testing and commissioning systems of similar size and complexity. Control system manufacturer shall certify that the startup personnel have been trained on the proper installation, programming, testing, and commissioning of the system.

1.7.3 Manufacturer Qualifications

Provide BAS equipment from manufacturers regularly engaged in the manufacture of equipment of the types and capacities indicated, with such products in satisfactory use in similar service for not less than 5 years.

Manufacturer must also maintain, within 100 miles of the project site, a local service center or a qualified local dealer/representative office which is capable of providing training, parts, and emergency maintenance and repairs.

1.8 DELIVERY, STORAGE AND HANDLING

A. Store equipment and materials inside and protected from weather.

B. Factory-Mounted Components: Where control devices specified in this Section are factory mounted on equipment, arrange for shipping control devices to unit manufacturer.

1.9 EXTRA MATERIALS

A. Line Replaceable Unit (LRU) and spares: Provide a complete list of spare parts, which will be turned over at the completion of this project. List shall include part name, original manufacturer of part, original manufacturer's part number and quantity being provided. An LRU is defined as the lowest unit to be replaced within the system during site corrective maintenance. It is a separate, replaceable, physical package, performing a single function or a group of closely related functions. An example of an LRU is a plug-in printed circuit card. These units shall be identified as parts readily available from several commercial sources in addition to the manufacturer and parts available only from the manufacturer and shall indicate the exact source of each including price and lead time of each.

Submit a unit price list for line replaceable units.

B. Re-procurement package: Submit a re-procurement package at the completion of this project, which includes documentation required to re-procure parts available only from the manufacturer from alternate sources. This list shall identify:

1. Actual manufacturer of the part;

2. Unit cost;

3. Parts that are electrostatic sensitive;

4. Total usage for each unit LRU; and

SECTION 23 09 23.13 20 Page 11

5. Schematics and board drawings

C. At the completion of this project, furnish extra (except as noted) LRUs of each type installed, packaged with protective covering for storage, and identified with labels clearly describing contents, as described below.

Quantity shall be determined by taking 2% of the total quantity of the devices used on the job and rounding up to the next highest whole number.

The LRUs items listed below shall represent minimum item types, but is neither complete nor is it only limited to:

1. Space Thermostat (of each type provided)

2. Duct Temperature Sensor

3. Water Temperature Sensor

4. Water Differential Pressure Transmitter

5. Air Differential Pressure Transmitter

6. Air Differential Pressure Switch

7. Valve Actuator (each type used)

8. Valve Repair Kit

9. Damper Actuator (each type used)

10. Damper Position Switch

11. AAC (one of each type)

12. Power Supply

13. Air Flow Measurement Station

14. Control Relays (one of each type)

15. Current Switches (one of each type)

PART 2 PRODUCTS

2.1 MANUFACTURER

The BAS to be installed under this contract shall be fully compatible with and functionally tied into the existing Trend Controls BAS in the Thule Air Force Base.

2.2 SYSTEM PERFORMANCE

2.2.1 Performance Standards

At the completion of the project with all panels and system operational, the BAS shall conform to the following:

1. Graphic Display: The BAS shall display a graphic with 20 dynamic

SECTION 23 09 23.13 20 Page 12 points/objects with all current data within 10 seconds.

2. Graphic Refresh: The BAS shall update a graphic with 20 dynamic points/objects with all current data within 8 seconds.

3. Object Command: The maximum time between the command of a binary object by the operator and the reaction by the device shall be less than 10 seconds. Analog objects should start to adjust within 10 seconds.

4. Object Scan: All changes of state and change of analog values will be transmitted over the high-speed BACnet Ethernet network such that any data used or displayed at a controller or workstation will have been current within the previous 10 seconds.

5. Alarm Response Time: The maximum time from when an object goes into alarm to when it is annunciated at BAS server shall not exceed 45 seconds.

6. Program Execution Frequency: Custom and standard applications shall be capable of running as often as once every 1 second. The Contractor shall be responsible for selecting execution times consistent with the mechanical process under control.

7. Performance: BC and AAC shall be able to execute PID control loops at a frequency of at least once per second. The controller shall scan and update the process value and output generated by this calculation at this same frequency.

8. Multiple Alarm Annunciation: BAS server on the network must receive alarms within 5 seconds of each other.

9. Spare I/O Points: As a minimum, the contractor shall provide 15% of spare I/O points, or at least one of each type of spare point, analog input, analog output, digital input and digital output, for each system controller(s).

10. The BAS shall be capable of being expanded through either the use of additional controllers or expansion cards to provide complete control of future HVAC equipment.

2.3 BUILDING CONTROLLER (BC)

2.3.1 General

Each BC shall be classified as a BACnet and conform to the BACnet Building Controller (B-BC) device profile.

2.3.2 System Operation

The BC shall operate the equipment as described in the sequence of operation. The system shall include the following:

1. Software: The BC complete with software shall be capable of controlling and monitoring electrical equipment; heating, ventilating and air conditioning equipment; and energy management systems. The BC shall route communications between the BACnet/IP network and BACnet MS/TP field network. The BC shall be specifically designed to be monitored by and communicate with the existing BAS server.

SECTION 23 09 23.13 20 Page 13

2. Controllers: Microprocessor based processors, with one or more microprocessor based input/output (I/O) modules interfacing controllers to the sensors and output devices. The system shall utilize EPROM or RAM memory. RAM and the clock for EPROM/RAM systems shall be provided with power backup of 4-hour instant recharge capacitor or 12-hours trickle recharge batteries. The battery backup shall protect the memory for a minimum of 72 hours. Controllers shall have memory error checking. Upon detection of a memory error, the controller processor shall correct the error or halt the unit to prevent erroneous operation. The BC shall be listed in UL 916 PAZX.

3. Optional Inputs and outputs: The BC may support inputs and outputs as follows:

a. Analog Input: Analog inputs shall be compatible with temperature sensors, 0-20 mA, 0-5 V DC, 0-10 V DC or potentiometer inputs with 12 bit A/D conversion resolution minimum. Match inputs types to sensors provided.

b. Analog Output: Analog output or pulse width modulated outputs shall be provided for control of end actuator devices. Overall analog output range of 0 to 10 volts or 4-20 mA with 8 bit D/A resolution minimum shall be provided.

c. Digital Inputs: Digital inputs shall be processed for change of status. Alarm monitor points shall be assignable to normally open or to normally closed contacts.

d. Digital Outputs: Digital outputs shall be assigned a priority with higher priorities able to override lower priorities.

Controller digital, two positions signals may operate the positioning device directly or have an interposing relay to give the proper signal level.

e. I/O Point Distribution: All I/O points specified for a piece of equipment shall be integral to a single controller. The contractor shall submit an approval request to the COTR when more than one piece of equipment is controlled by a single controller.

f. Controller Capacity: Each BC shall have the ability to monitor, control and address the required data points. The mix of addressable points shall include analog inputs, analog outputs, digital inputs and outputs required to perform the functions indicated.

4. Communication:

a. Each BC shall communicate with existing BAS server, and interact with the Trend Controls system to control and monitor the facility from BAS server.

b. BACnet routing shall be performed by BCs or other BACnet device routers as necessary to connect BC(s) to networks of AACs.

c. Service Port: Each controller shall be provided with a service communication port, which is BACnet Data Link/Physical layer compatible, for connection to a Portable Operator's Terminal.

SECTION 23 09 23.13 20 Page 14

d. Signal Management: BC operating systems shall manage input and output communication signals to allow distributed controllers to share real and virtual object information and to allow for central monitoring and alarms.

e. Data Sharing: Each BC shall share data as required with each networked BC and AAC. All points on the BC shall be communicated to the existing BAS server.

5. BC Configuration: It shall be possible to configure the BC over the network. This configuration shall include application program assignments; group and point assignments; data point modifications (additions and deletions); alarm parameter assignments; and peripheral assignments.

6. Software: The BC, complete with software, shall provide a real time control language for HVAC system applications designed to accomplish easy transition from hardware control system design to local loop based control system design. The system software shall allow the user to provide control sequences directly into the controller and operators terminal memory.

7. Alarms: Whenever a field point status exceeds preset limits, or there are other indications of system exceptions, alarms, error or failure, there shall be at least the following indications:

a. The BAS server shall sound an integral audible tone. The audible tone shall be capable of being enabled or disabled on operator command.

b. The alarm point identification, along with individual point alarm messages, shall appear at the BAS server. Upon operator command, a list of alarm points programmed into the BAS, along with their alarm messages, shall be listed on the BAS server.

c. Alarm prioritization shall be configured in accordance to the applicable categories as specified in ASHRAE 135A, BACnet. The contractor shall consult with the COTR during the commissioning and configure in a manner that distinguishes between the facilities involved and to meet other operational needs requested by the Government.

8. Memory, processing and functional capability: Specifically, a BC shall contain memory, processing and functional capability to perform the following in a stand-alone mode:

a. Scheduled start/stop; based on time of day, calendar, holiday, lead/lag schedule and temporary schedules;

a. Scheduled start/stop; based on time of day, calendar, holiday, lead/lag schedule and temporary schedules;

b. Adaptive start/stop;

c. Duty cycling;

d. Automatic temperature and humidity control;

e. Demand control using a sliding window, predictive algorithm;

SECTION 23 09 23.13 20 Page 15

f. Event initiated control;

g. Calculated point including energy calculations;

h. Scanning and alarm processing;

i. Full direct digital control;

j. Trend logging;

k. Global communications;

l. Maintenance scheduling;

m. BACnet communications with the BAS server and other controllers;

n. Night setback control;

o. Variable frequency drive/air flow control;

p. Enthalpy or dry bulb switch-over (economizer); and

q. Temperature compensated load reset.

9. BC global communications: Global data values required by the installation shall be updated using change-of-value notifications.

10. BC upload and download capability: Each BC shall support backup and restore functionality.

11. Communications Loss - Stand-Alone Operation: The BC shall continue, without interruption, to operate peripheral equipment if communications with the network bus is interrupted. Provide stable and reliable stand-alone control using default values or other method for values normally read over the network. Alarms shall be stored until memory is filled or programmed for mninimium time storage, and then when communications are restored, the alarms and abnormal operating conditions shall be transmitted to the BAS server.

12. Fail Safe Operation - BC power loss or component failure: When the BC is disabled or in the event of a power failure to the BC, outputs shall fail as indicated in the sequence of operation and the "BAS Point Function Schedule". For such items as remote temperature adjustment, the reset signal shall maintain its last setting. Upon the resumption of normal power, the BC shall analyze the status of controlled equipment, compare it with normal occupancy scheduling, and turn equipment on or off as necessary to resume normal operation.

13. Real time clock. Routines shall be provided to maintain time of day, date and interval timers.

2.4 INPUT AND OUTPUT SENSOR AND DEVICES

General: Input and output sensors and devices shall be closely matched to the requirements of the controller for accurate, responsive, noise free signal input and output. Control input sensitivity shall be matched to the control loop gain requirements for precise and responsive control. In no

SECTION 23 09 23.13 20 Page 16 case shall computer inputs be derived from pneumatic sensors nor shall thermocouples be used.

2.4.1 Temperature Sensors

Temperature sensors shall be Thermistor or Resistance Temperature Detector

(RTD).

a. Duct Temperature Sensors: Rigid stem or averaging type as specified in the sequence of operation or as shown on the control drawings. Accuracy shall be plus or minus 0.5 deg C. Averaging sensors shall be a continuous element at least 3 meters long per square meter of duct cross-sectional area at the installed location. The sensing element shall have a bendable copper sheath.

b. Water Temperature Sensors: Provide with a separable, copper, or stainless steel well. Accuracy shall be plus or minus 0.5 deg C over range of 5 to 121 deg C.

2.4.2 Thermowells

Thermowells shall be Series 300 stainless steel with threaded brass plug and chain, 50 mm lagging neck and extension type well. Inside diameter and insertion length shall be as required for the application.

2.4.3 Freeze Protection Thermostat

Provide with manual reset and an adjustable set point between minus 1 to 10 deg C. Thermostat shall include sensor that responds to lowest temperature sensed in any 0.5 meter segment of the element. Install sensor as per the manufacturer's recommendations. Freezestat shall be provided with a minimum of two contacts, one rated for a minimum of 120V, 16 Amps, and one for a minimum of 120V, 6 Amps.

2.4.4 Differential Pressure Transmitter (Liquid)

The differential pressure transmitter shall be capable of measuring differential pressures from 0 to 1724 kPa (250 psig) and shall be calibrated for 0 -690 kPa (100 psig). The output signal shall be transmitted in an analog 4-20 mA format with an accuracy of plus or minus

0.5 percent of the calibrated span. The transmitter shall have a local span and zero adjustment and 3-valve manifold to allow for field calibration. Transmitter shall be capable of withstanding pressures of up to 1724 kPa without damage or re-calibration.

2.4.5 Differential Pressure Transmitted (Air)

The differential pressure transmitter shall be calibrated for the appropriate operating range based on set point. The output signal shall be transmitted in an analog 4-20 mA or 0-10V format with an accuracy of plus or minus 1 percent of the calibrated span. The transmitter shall have a local span and zero. Transmitter shall be capable of withstanding pressures of up to 8 times the calibrated range without damage or re-calibration.

2.4.6 Valve Bypass for Differential Pressure Transmitter

Provide a five-valve bypass kit for protection of DP transmitter where the

SECTION 23 09 23.13 20 Page 17 static on the pipe can cause an over pressure when connected to one port with the other port at atmospheric pressure. Kit shall include high and low pressure isolation valves, high and low pressure vent valves, and a bypass valve contained in a NEMA 1 enclosure.

2.4.7 Equipment Operation Sensors

2.4.7.1 Current Switches

Current Switches: Current switches shall be sized for a current range appropriate to the fan or pump motor being monitored. The trip point shall be adjustable through a pot and set to 75 percent of rated motor current.

The current switch shall be capable of withstanding a maximum continuous current of 150 Amps. Operating temperature shall be minus 50 deg C to 65 deg C. The current relay shall meet UL 94V-0 for flammability. An LED indicator shall be included which distinguishes between the following three conditions: tripped relay switch, current present but relay switch not tripped and no current present. The monitored frequency shall be 6 Hz minimum, allowing for accurate monitoring of variable frequency drives. The relay switch shall be rated for 1 to 135 VAC/DC at 0.3 Amps and shall not be polarity sensitive.

2.4.7.2 Differential Pressure Switch (Air)

Differential pressure switch piped across filter or fan inlet and outlet with adjustable set point and a range of 0 to 1.25 kPa, with maximum pressure rating of at least 2.5 kPa.

2.4.8 Wall Mounted Room Thermostat (Hot Water Unit Heater only)

The wall mounted room thermostat shall provide control of two-pipe unit heater using one on/off output for fan control, and one proportional output for heating control valve. The thermostat shall be provided with local keypad or dial to adjust the thermostat set point within the range of 12 to 28 degrees C. Provide room thermostats located on the wall as shown on the drawings. Thermostats shall have the following minimum performance:

1. Power supply: 19-30 VAC 50 or 60 Hz

2. Operating conditions: 0 to 40 deg C; 0 to 90 percent RH (non-condensing)

3. Storage conditions: -20 to 50 deg C; 0 to 90 percent RH (non-condensing)

4. Output signal: Fan relay output: 30 VAC, 1 Amp. maximum; Valve analog: 0 to 10 VDC

5. Field connections: Screw Terminals for 22 to 18 gauge maximum

2.5 FLOW METERS (WATER SERVICE)

Electromagnetic Flow Meter: Provide electromagnetic type flow meters as shown on the mechanical sheets and described hereinafter. The flow meter shall have the DC powered electromagnetic coils and electrodes, and measure the induced voltage across the electrodes as a conductive fluid flows through the magnetic fields. The voltage is proportional to the average flow velocity of the fluid and then amplified and processed digitally by the converter to produce the signal for flow rate and totalization. Provide flow meters and transducers located on the pipe as shown on the drawings.

Locate meter to provide the most efficient reading point.

1. Flow Range: 0.1 ~ 10 m/second

SECTION 23 09 23.13 20 Page 18

2. Pipe size range: 25 mm through 600 mm nominal

3. Flow Direction: Unidirectional or Bidirectional

4. Provide remote transmitter with mounted hardware and the necessary cable

5. Alphanumeric LCD displays total flow, flow rate, flow direction and alarm conditions

6. Output signal: 4-20 mA or 0-10V analog output for flow rate

7. Accuracy: 0.4 percent of calibrated span for liquids

8. Fluid conductivity: 5 µS/cm minimum

9. Maximum fluid temperature: 75 deg C

10. Ambient temperature range: minus 20 to plus 60 deg C

11. Maximum operating pressure: 1724 kPa

12. Stainless steel electrode and tube with PTFE liner

13. Housing: NEMA 4X

14. Body: Wafer to match piping style or ANSI flanged specification.

15. Power Supply Options: 90 to 265 VAC, 45 to 60 Hz, and 35 mA maximum

2.6 ADVANCED APPLICATION CONTROLLER (AAC)

2.6.1 Advanced Application Controller

A limited capacity microprocessor based controller that is custom programmable. Each AAC shall be classified as a BACnet and conform to the BACnet Advanced Application Controller (B-AAC) device profile. The controllers shall be EPROM based with sufficient I/O point capacity for controlling the units in accordance with the control drawings and the sequence of operation. The controllers shall be capable of processing the signals of the specified sensors, and shall have the capability to drive the outputs required. The AAC shall be listed in UL 916 PAZX.

1. Memory: The controller shall have sufficient memory to support its own operating system and database. All set points, proportional bands, control algorithms, custom programming, and any other programmable parameters shall be stored for a minimum of 72 hours without requiring reprogramming, in the event of the loss of power.

2. Operator Interface: The controller shall have the capability of receiving configuration and program loading from the BAS server or a compatible Portable Operator's Terminal.

3. Communications: Each AAC shall reside on a BACnet network using BACnet MS/TP. In the event of a network failure, the controller shall be capable of operating in a stand alone mode.

4. Service Port: Each controller shall provide a service communication port for connection to a Portable Operator's Terminal.

5. Signal Management: AAC operating systems shall manage input and output communication signals to allow distributed controllers to share real and virtual object information and to allow for central monitoring and alarms.

6. Data Sharing: Each AAC shall share data as required with each networked BC and AAC. All points on the AAC shall be communicated to the BAS server.

7. Controller local loops: Controllers shall be totally stand alone and independent of the BAS server, for indicated control applications.

SECTION 23 09 23.13 20 Page 19

Failure of the BAS server shall in no way inhibit the operation or program execution of the controllers. Controllers software shall include a complete operating system, application packages as indicated, standard control algorithm application packages, and a user control and calculation application package and the following:

a. Analog Input: Analog temperature inputs shall be compatible with RTD temperature sensors. Analog inputs shall also accept 4-20 mA or 0-10 VDC. Match inputs types to sensors provided.

b. Analog Output: Analog output or pulse width modulated outputs shall be provided for control of end actuator devices. Overall analog output range of 0 to 10 volts or 4-20 mA with 8 bit D/A resolution minimum shall be provided.

c. Digital Inputs: Digital inputs shall be processed for change of status. Alarm monitor points shall be assignable to normally open or to normally closed contacts.

d. Digital Outputs: Digital outputs shall be assigned a priority with higher priorities able to override lower priorities.

Controller digital, two position signals may operate the positioning device directly or have an interposing relay to give the proper signal level.

e. I/O Point Distribution: All I/O points specified for a piece of equipment shall be integral to a single controller. The contractor shall submit an approval request to the COTR when more than one piece of equipment is controlled by a single controller.

f. Controller Capacity: Each AAC shall have the ability to monitor, control and address the required data points. The mix of points shall include analog inputs, analog outputs, digital inputs and outputs in sufficient quantities to perform the function indicated.

8. AAC Configuration: It shall be possible to configure the AAC over the network. This configuration shall include application program assignments; group and point assignments; data point modifications (additions and deletions); alarm parameter assignments; and peripheral assignments.

9. Software: The AAC, complete with software, shall…