Robert E. McMains Date Robert E. McMains Date

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1 DESIGN AND CONSTRUCTION STANDARDS Title: Section Direct-Digital Control System for HVAC & Mechanical Author: Author: Date Active Version Distribution: Date Approved By: Approved By: Robert E. McMains Date Robert E. McMains Date Discontinued: Cross-Reference (CR): Section , Section , Section , Section , Section , Section A. Purpose: This standard establishes a series of guidelines for specifying HVAC Controls for any construction project at the University. This Facilities Standard is not to be regarded as a specification. It is to provide minimal criteria for construction materials at UAB Facilities regarding code compliance, warranty, approved products, execution and uniformity for HVAC Controls. The University has a Strategic Partnering Agreement with Siemens Industry Inc., Building Technologies Division. This agreement establishes Siemens as a sole source provider for building automation systems to the University. All new construction for new buildings and in existing buildings should adhere to this agreement. Specifications developed for Direct Digital Controls should consider building dashboards and metering. B. Requirements: All new buildings shall have a computer workstation allowance in the project for accessing the building automation system. Due to the University security policies, the computer must be purchased by the University. It is desired that all of the building s equipment be integrated into the building automation system either existing, or as part of the ongoing project. In order to prevent component failures from affecting too much of a building s operation at the same time, the subsystem controls must be capable of operating in a stand-alone mode so as not to require remote access or communication with another controller or front-end computer to function. As a rule, the amount of equipment controlled in a single processor based controller should not exceed two energy using systems. The control strategies for HVAC equipment shall take advantage of current ASHRAE (American Society of Heating, Refrigeration and Air Conditioning Engineers) energy conservation measures that are required by code and, additionally, those measures that are cost effective and applicable to the current project. The Design Engineer shall provide UAB with an analysis to show requirements have been met for a minimum Energy Star rating of 75, and a simple payback period analysis for each energy conservation measure above and beyond that required by code. UAB will then decide if the additional measures will be included in the project. Energy conservation measures addressed by ASHRAE as pertain to air handlers include, but are not limited to ASHRAE 62.1, ASHRAE In addition to those conservation measures required by code, UAB requires the following: 1. Airside economizer on all recirculation air handlers 10,000 CFM or greater. (Reference Air Handling Systems Standard No ) 2. Heating water temperature setback on a linear scale based on actual outside air temperature.

2 3. All new construction and renovation projects shall use pressure independent (VAV or CAV) air terminals and central air handling units with variable speed drives to maintain space heating, cooling, and ventilation. Each terminal should be controlled by a space thermostat with a night setback override button. Setback programs and schedules shall already be pre-programmed and functional. Temperatures and schedules shall be readily accessible from the graphical user interface of the building automation system for the building. 4. Where independent air handlers, fan coil units, split-systems are used for spaces not served from a central air handling system, the thermostat that serves the space must have a night shutdown override button. These types of independent systems shall be programmed to be shutdown based on schedule. Shutdown programs and schedules shall be pre-programmed and functional. Temperatures and schedules shall be readily accessible from the graphical user interface of the building automation system for the building. 5. Controls for clinical and research laboratories shall have room pressurization and hood sash controls. Setback programs and schedules shall be already programmed and functional. Temperatures, air changes, pressures, and schedules shall be readily accessible from the graphical user interface of the building automation system for the building. Setbacks shall be implemented by an occupancy sensor(s) and the thermostat shall have a setback override button. Setbacks will utilize air change reductions based on air volume and not temperature. An indicator light shall be located near the thermostat showing that the room is either in setback mode or normal operating mode. 6. Spaces with significantly different occupancy should be on separate HVAC systems or separate zones, so that those areas can be shut down individually. 7. Heat recovery for air handling units with greater than a 50% outdoor air requirement (not including units with an airside economizer). 8. Demand controlled ventilation (CO 2 based) in all gymnasiums and all areas of assembly, classroom, lecture, auditoriums, foyers, and atriums greater than 2000 square feet. 9. Server rooms and electrical closets shall have their own VAV terminal, fan coil unit, or DX split system as not to affect the setback of the floor or area. C. Products: Equipment and software used shall be limited to the following Controls companies: 1. Siemens Controls utilizing the Apogee platform and PXC network controller and its P1 & Bacnet field buses. All software, hardware, third party software, equipment with computer chips shall: 1. Function without interruption or human intervention with four-digit year processing on all data. 2. Provide data interchange in the ISO 8601:2004 standard of CCYYMMDD or YYYYMMDD. 3. In the event that hardware, software or vendor generated programs do not meet the above conditions, the expense of new software, hardware and labor will be the expense of the Licensor/Vendor. Siemens shall furnish and install a fully integrated building automation system (BAS), incorporating direct digital controls (DDC) for energy management, equipment control and monitoring, and subsystems as defined in the project. Siemens shall be responsible for all BAS and Temperature Control wiring for a complete and operable system. All wiring shall be done in accordance with Section and all local and national codes. Building Automation Servers and Graphical User Interface (GUI) The servers for the building automation systems are provided by and maintained by UAB Facilities Management. They are located in the Facilities Management main server room. All user licenses, software revisions and updates are maintained by Facilities Management. 1. Due to security risk to the health care and research buildings that Facilities maintains no parties outside of UAB may have access to the building automation system unless it is approved by the Assistant VP, Facilities Management. 2. All GUI s on the servers shall have the same consistent layout with UAB Facilities header at the top of the page and the menu selectable footer at the bottom of the page. 3. Al GUI s shall have 3D symbols and objects including the floor plan GUI. 4. The background color for all GUIs shall be color code is RGB

3 5. All physical points, virtual set points, and command points must be presented on a graphical user interface on the building automation server. 6. All control system as-built drawings must be stored on the server and links to the drawings provided on the main GUI that represents the project. 7. Stand alone control systems where the building automation system is located on a separate server other than the servers provided by and maintained by Facilities Management are not allowed. If the UAB end user desires such a system then that system server will not be maintained by Facilities Management. D. Execution: TYPE 1 CONTROLS are associated with large energy using systems such as the following: 1. Chillers and other central plant equipment (200 Refrigeration Tons and up). 2. Boilers and associated heating plant equipment (50 Boiler horsepower and up). 3. Large air handling units, cooling and heating coils, fans, dampers, filters, and their associated equipment (10,000 Cubic feet per minute and up). 4. Large capacity steam converters and associated equipment (1,000 pounds per hour and up). 5. Large fans for ventilation systems (20,000 Cubic feet per minute and up). 6. Large pumps and associated equipment (1,000 gallons per minute and up). 7. Large preheat, reheat, and sub-cooling systems (10,000 Cubic feet per minute and up). 8. Large air distribution and exhaust systems (20,000 Cubic feet per minute and up). 9. All energy using equipment in critical areas such as operating rooms, burn treatment rooms, animal areas, special labs, etc. TYPE 2 CONTROLS are those mounted in or above the space and controlling terminal devices such as VAV (Variable Air Volume) boxes, terminal reheat boxes, lab pressurization & hoods, fan coil units, small air handling units or other such devices. Documentation: 1. In addition to the manufacturer s nameplate, a durable identification tag shall be permanently attached to the body of all instruments and devices. This tag will show the same identification that is shown on the control prints. Field mounted devices shall be provided with stainless steel tags, and panel mounted instruments with hard plastic nameplates. 2. Control system submittals that include the sequence of operation, proposed control devices and Control loop diagrams shall be submitted to the Design Engineer and the Facilities Energy Management ICE (Instrumentation Controls and Electronics) Division for review and approval. After approval, three copies shall be submitted to the University s Project Manager for distribution to Maintenance, Energy Management, and Facilities Planning, Design and Construction for comments. These drawings should be clear and legible, but not necessarily the final drawings. 3. All instrument drawings shall identify the instruments with the same tag number, as provided on the instrument itself. All tag numbers shall include the function identification, as well as, the instrument loop number common to all devices on that loop. In addition to printed copies, instrument drawings and information other than manuals will be provided to the University in electronic format compatible with AUTOCAD, Adobe Acrobat, or Microsoft Word. 4. A typical loop diagram as defined by the American Standards Institute/Instrument Society of America Standard 5.2, 5.3, and 5.4 Instrumentation Symbols and Identification shall be provided for each loop of each instrument, identifying the connections for each instrument. 5. Control drawings shall be provided for every control system during the design stages and shall be submitted with the design stages. These drawings shall show all major equipment and the control components associated with this equipment, including connections between sensors, controllers, all interlocks from external systems, and actuators. The drawings shall also define the sequence of operation of the system. 6. An electronic copy of the as-built control drawings and any later revisions shall be stored on the building automation server and a link to the drawing shall be provided on the main GUI for the project. Three sets of bound hard copies of the as-built control drawings, including the as-built sequence of operation, must be delivered to the University s Project Manager fourteen calendar days before orientation for distribution to the Facilities Energy Management ICE Division, Maintenance, Energy Management, and Facilities Planning, Design and Construction. If changes are made during the warranty period, three additional sets showing those changes are to be submitted at the completion of the warranty period. All drawings must show each control loop, completed with all external

4 components that affect operation of the loop. All field wiring must be shown as individually field marked at all terminals and junctions for field identification. No field wiring should be shown as typical. 7. Operating, maintenance and repair manuals must be delivered to the University s Project Manager fourteen calendar days before orientation for distribution to the Facilities Energy Management ICE Division, Maintenance, Energy Management and Facilities Planning, Design and Construction. These manuals must be complete with information to operate, maintain and repair the equipment. The University understands that control manufacturers may have some proprietary information relating to MICRO chips, program execution, board level components and built-in program subroutines; however, it is unacceptable to the University for a manufacturer to limit information for operating, repairing and programming control systems to its employees or representatives exclusively. 8. Fourteen days before orientation the Contractor shall provide and mount, in the equipment location, design operating sequences as well as points for all energy consuming equipment installed. The Contractor will provide framing to encase and protect such information. At the end of the warranty period this information will be upgraded if changes have been made. The University s Energy Management and Maintenance Departments should receive this information in an electronic format using Microsoft Word, AUTOCAD, or PDF. 9. Software and hardware required to operate, maintain and repair all parts and equipment related to the control system shall be turned over to Energy Management ICE Division through the University s Project Manager at the time the University takes over operation of the area. This information will include copies of the program, configuration files in a format for downloading directly into the systems, a format that allows editing and reinstalling. Communication devices, cables, coded keys, and any other hardware required to work with the system will be provided to the University s Project Manager at this time. 10. The University will comply with software license for systems. Due to the number of systems installed at the University, and the rapid changes expected in software, the University desires all software to be University licensed (all of the University), with basic verbal assistance when requested, so that software may be installed in remote locations within the University. It is also required that all software be backward compatible to existing systems. Communication Between Controls: TYPE 1 CONTROLS must be installed with the capability of communicating over the University s fiber optic Ethernet LAN (Local Area Network) network, using TCP/IP protocol only, to the University s servers without going through an operator s station. The network interface card will be 100 Meg Ethernet compatible 10/100 switchable. Although some buildings are not integrated into the existing fiber network at this time, all buildings will be in the future. Whether or not fiber is available, the controls will be Ethernet compatible for access when fiber connection is available. Type 1 Controls shall be provided with translators, software and other equipment, as required, to allow these controls to be monitored, reset, histories read, and all other functions performed from the local network controller. TYPE 2 CONTROLS shall also communicate as described above, but may use Type 1 Controller as a gateway. This communications protocol shall be the network controller s proprietary RS485 bus or Bacnet MSTP bus. THIRD PARTY EQUIPMENT CONTROLS that have controllers as an integral part of the equipment package, such as chillers, boilers, electrical switchgear, etc., shall only use the proprietary or Bacnet bus of the building automation system that is monitoring and/or controlling it. If this is not an available option on the equipment and all efforts have been exhausted to provide the equipment with one of these two option then Modus or LON can be used. These third party communication installations must be approved by the Facilities Energy Management ICE Division during the design review. Third party equipment that use the BACnet protocol must have a University assigned BACnet instance number so that the new equipment s controller does not have a communications conflict with existing building automation BACnet controllers. The instance number must be given to the manufacture when ordering the equipment. When the instance number is requested by the party purchasing the equipment the Energy Management ICE Division will assign it. Related Equipment: There is certain related equipment, not strictly classified as controls, which has a control function; therefore, that equipment is to be considered as such and is addressed in this section for emphasis. Lighting controls shall be a Siemens solution that works and communicates using their controllers. Variable Frequency Drives (VFD s) are so interrelated to the control system as to be considered a part of that system. Drive specifications are addressed in Facilities Standard Signals between the control system and the drive

5 shall be optically isolated to prevent a conflict between grounding potential. The drive shall be given full consideration as to its function in the design of the controls as they relate to airflow, coil conditions, chilled and hot water reset, etc. Wiring 1. All control wiring must be shielded and twisted as pairs equal to the following Beldon numbers: Single twisted shielded pair 8770; three conductor twisted shielded for RTD s (Resistant Temperature Devices) 8770; two conductor twisted shielded plenum rated 88760; three conductor twisted shielded plenum rated All control wiring should be installed in steel conduit as specified in Electrical Standard Conduit will be marked purple tape as defined in Electrical Standard A minimum distance of twelve inches shall be maintained between conduit containing power wiring and control wiring. Where power and control wire cross, it shall cross at right angles. 3. All building automation controllers and panels shall be on emergency power. The only exception is for buildings that don t have emergency power. All building level controllers must have an uninterruptible power supply (UPS) with a fail over 4 pole relay that switches it back to the panel electrical circuit upon failure. The 4 th pole on the relayed shall be wired back to the building automation as a failed UPS alarm. The system s electrical power and ground circuit will be tested for ground loops, voltage spikes, harmonics, etc., and shall be verified suitable for operation with the control system. A copy of this test will be included in the calibration documents. When necessary, power conditioners will be installed. 4. All cables between instruments, panels, and other control components shall be identified by permanently identified cable markers on each end of the cable at each termination point. This identification shall be unique for each cable or wire so that each will be identified on the control print. All terminals shall be numbered in the same unique manner and should have a separator between the screw heads. All cables and loose wires in panels shall be run in plastic enclosures designed for that purpose. All panels should be wired so that low voltage 24 volts alternating or direct current is kept separate from high voltage 120 volts alternating current. 5. All control panel wiring will enter through the bottom of the cabinet no penetrations into the top of the cabinet are acceptable. 6. Color coding identification will comply with Standard Certified Factory Training and Orientation Training and orientation needs will vary greatly for different projects. Training for the University s Maintenance and Energy Management personnel is a necessity and is required. The specific requirements should be discussed with the Facilities Energy Management ICE Division Committee. Forty hours of on-site training by a factory certified technician should be provided. This will be performed during normal working hours and will be in addition to orientation. The University will work with the Contractor to schedule these hours to be acceptable to both the University and the Contractor, but no more than fourteen (14) calendar days notice should be required. This training will be videotaped by the Contractor. Professionally produced training tapes may be substituted for the Contractor taping the training. End of Standard

Element D Services Heating, Ventilating, and Air Conditioning

Element D Services Heating, Ventilating, and Air Conditioning PART 1 - GENERAL 1.01 OVERVIEW A. Provide a building temperature control/building automation system (BAS) for the space temperature control and monitoring of defined environmental conditions. General system