Section 15975 – DIRECT DIGITAL CONTROL SYSTEMS

PART 1 – GENERAL

1.1 DESCRIPTION

    1. Provide labor, materials, tools, equipment, transportation, insurance, temporary protection, supervision, services, and incidental items essential for proper installation and operation, even though not specifically mentioned or indicated on the drawings but which are usually provided or are essential for proper installation and operation of all systems related to this Section, as indicated on the drawings and specified herein.

    1. WORK INCLUDED

    1. Building Automation System (BAS) Contractor shall provide:

      1. A fully integrated building automation system (BAS), UL listed, incorporating direct digital control (DDC) for energy management, equipment monitoring and control.

      2. Complete temperature control system to be DDC as specified herein.

      3. All wiring, conduit, panels, for all DDC temperature controls.

      4. All final electrical connections to each stand-alone Application Specific Controller and DDC Controller.

      5. BAS Contractor shall be responsible for all electrical work associated with the BAS control system and as called for on the Drawings.

      6. Refer to specification section 15985 – Sequence of Operations for additional requirements.

    1. GENERAL PRODUCT DESCRIPTION

    1. The building automation system (BAS) shall integrate multiple building functions including equipment supervision and control, alarm management, energy management and historical data collection. All control , alarm and report functions will be displayed and accessed from any of the four existing BAS operators terminals .

    2. The building automation system shall consist of the following:

      1. Stand-alone Modular DDC Controllers

      2. Stand-alone Application Specific Controllers (ASCs)

    3. The system shall be modular in nature and shall permit expansion of both capacity and functionality through the addition of sensors, actuators, DDC Controllers, Application Specific Controllers and operator devices.

    4. System architectural design shall eliminate dependence upon any single device for alarm reporting and control execution. Each DDC Controller shall operate independently by performing its own specified control, alarm management, operator I/O and data collection. The failure of any single component or network connection shall not interrupt the execution of control strategies at other operational devices.

    5. DDC Controllers shall be able to access any data from, or send control commands and alarm reports directly to, any other DDC Controller or combination of controllers on the network without dependence upon a central processing device. DDC Controllers shall also be able to send alarm reports to multiple operator workstations without dependence upon a central processing device.

    1. DIVISION OF WORK

    1. BAS Contractor to furnish:

      1. To Heating Contractor for installation:

        1. Hot Water Control valves of Electronic type

        2. Location of all wells and openings for water monitoring

      1. To Ventilation Contractor for installation:

        1. Air dampers

        2. Air flow measurement and control equipment

    1. QUALITY ASSURANCE

    1. Materials and equipment shall be the catalogued products of manufacturers regularly engaged in production and installation of automatic temperature control systems and shall be manufacturer's latest standard design that complies with the specification requirements.

    2. Install system using competent workmen who are fully trained in the installation of temperature control equipment.

    3. Single source responsibility of supplier shall be the complete installation and proper operation of the BAS and control system and shall include debugging and proper calibration of each component in the entire system.

    4. Supplier shall have an in-place support facility within 10 miles of the site with technical staff, spare parts inventory and all necessary test and diagnostic equipment.

    5. The building automation system shall conform to the following standard for Year 2000 Compliance:

      1. The system shall not produce errors when processing date data (including calculating, sorting, or displaying) from, into and between the years 1999 and 2000 and for leap year calculations in the year 2000, to the extent that date information provided from other connected systems is accurate.

      2. The BAS supplier shall provide documentation to support the individual device(s) Year 2000 Compliance. This document shall include a listing of compliance by device and any exceptions to the above conditions.

    1. SUBMITTALS

    1. Submit eight (8) complete sets of documentation.

      1. Manufacturer's Product Data:

        1. All equipment components

        2. Year 2000 Compliance documentation.

      2. Shop Drawings:

        1. System wiring diagrams with sequence of operation for each system as specified.

        2. Submit manufacturer's product information on all hardware items along with descriptive literature for all software programs to show compliance with specifications.

PART 2 - PRODUCTS

2.1 DESIGN MAKE

    1. Overall BAS: Landis & Staefa

2.2 NETWORKING COMMUNICATIONS

    1. The design of the BAS shall network operator workstations and stand-alone DDC Controllers. The network architecture shall consist of two levels, a high performance peer-to-peer network and DDC Controller specific local area networks.

    2. Access to system data shall not be restricted by the hardware configuration of the building automation system. The hardware configuration of the BAS network shall be totally transparent to the user when accessing data or developing control programs.

    3. Peer-to-Peer Network Level:

      1. Operator workstations and DDC Controllers shall directly reside on a network such that communications may be executed directly between DDC Controllers, directly between workstations and between DDC Controllers and workstations on a peer-to-peer basis.

      2. Network design shall include the following provisions:

        1. Support of any combination of DDC Controllers and operator workstations directly connected to the peer-to-peer network. A minimum of 32 devices shall be supported on a single network.

        2. Message and alarm buffering to prevent information from being lost.

        3. Error detection, correction and retransmission to guarantee data integrity.

    4. DDC Controller Local Area Network (LAN):

      1. This level communication shall support a family of application specific controllers and shall communicate bi-directionally with the peer-to-peer network through DDC Controllers for transmission of global data.

      2. A maximum of 32 application specific controllers may be configured on individual DDC Controller LANs to insure adequate global data and alarm response times. Provide additional LANs and supporting hardware as necessary to meet this requirement for all new and renovation work.

    5. Telecommunication Capability:

      1. The existing telecommunication system will be reused.

2.3 DDC CONTROLLER

    1. Stand-alone Controllers shall be microprocessor-based with a minimum word size of 16 bits. They shall also be multi-tasking, multi-user, real-time digital control processors consisting of modular hardware with plug-in enclosed processors, communication controllers, power supplies and input/output point modules. Controller size shall be sufficient to fully meet the requirements of this specification and the attached point list.

    2. Each DDC Controller shall have sufficient memory, a minimum of 1 megabyte, to support its own operating system and databases, including:

      1. Control processes

      2. Energy management applications

      3. Alarm management applications including custom alarm messages for each level alarm for each point in the system.

      4. Historical/trend data for points specified

      5. Maintenance support applications

      6. Custom processes

      7. Operator I/O

      8. Dial-up communications

      9. Manual override monitoring

    3. Each DDC Controller shall support:

      1. Monitoring of the following types of inputs, without the addition of equipment outside the DDC Controller cabinet:

        1. Analog inputs

          1. 4-20 mA

          2. 0-10 Vdc

          3. Thermistors

          4. 1000 ohm RTDs

        2. Digital inputs

          1. Dry contact closure

          2. Pulse Accumulator

          3. Voltage Sensing

      2. Direct control of pneumatic and electronic actuators and control devices. Each DDC Controller shall be capable of providing the following control outputs without the addition of equipment outside the DDC Controller cabinet:

        1. Digital outputs (contact closure)

          1. Contact closure (motor starters, sizes 1-4)

        2. Analog outputs

          1. 0-20 psi

          2. 4-20 mA

          3. 0-10 Vdc

    4. DDC Controllers shall provide at least two RS-232C serial data communication ports for operation of operator I/O devices such as industry standard printers, operator terminals, modems and portable laptop operator's terminals. DDC Controllers shall allow temporary use of portable devices without interrupting the normal operation of permanently connected modems, printers or terminals.

      1. DDC Controllers shall monitor the status of all overrides and inform the operator that automatic control has been inhibited. DDC Controllers shall also collect override activity information for reports.

    5. DDC Controllers shall provide local LED status indication for each digital input and output for constant, up-to-date verification of all point conditions without the need for an operator I/O device. Graduated intensity LED’s or analog indication of value shall also be provided for each analog output. Status indication shall be visible without opening the panel door.

    6. Each DDC Controller shall continuously perform self-diagnostics, communication diagnosis and diagnosis of all panel components. The DDC Controller shall provide both local and remote annunciation of any detected component failures, low battery conditions or repeated failure to establish communication.

    7. Isolation shall be provided at all peer-to-peer network termination’s, as well as all field point termination’s to suppress induced voltage transients consistent with IEEE Standards 587-1980.

    8. In the event of the loss of normal power, there shall be an orderly shutdown of all DDC Controllers to prevent the loss of database or operating system software. Non-volatile memory shall be incorporated for all critical controller configuration data and battery backup shall be provided to support the real-time clock and all volatile memory for a minimum of 72 hours.

      1. Upon restoration of normal power, the DDC Controller shall automatically resume full operation without manual intervention.

      2. Should DDC Controller memory be lost for any reason, the user shall have the capability of reloading the DDC Controller via the local RS-232C port, via telephone line dial-in or from a network workstation PC.

2.4 DDC CONTROLLER RESIDENT SOFTWARE FEATURES

    1. General:

      1. All necessary software to form a complete operating system as described in this specification shall be provided.

      2. The software programs specified in this Section shall be provided as an integral part of DDC Controllers and shall not be dependent upon any higher level computer for execution.

    2. Control Software Description:

      1. The DDC Controllers shall have the ability to perform the following pre-tested control algorithms:

        1. Two-position control

        2. Proportional control

        3. Proportional plus integral control

        4. Proportional, integral, plus derivative control

      2. Control software shall include a provision for limiting the number of times each piece of equipment may be cycled within any one-hour period.

      3. The system shall provide protection against excessive demand situations during start-up periods by automatically introducing time delays between successive start commands to heavy electrical loads.

      4. Upon the resumption of normal power, each DDC Controller shall analyze the status of all controlled equipment, compare it with normal occupancy scheduling and turn equipment on or off as necessary to resume normal operations.

    3. DDC Controllers shall have the ability to perform any or all the following energy management routines:

      1. Time-of-day scheduling

      2. Calendar-based scheduling

      3. Holiday scheduling

      4. Temporary schedule overrides

      5. Start-Stop Time Optimization

      6. Automatic Daylight Savings Time Switchover

      7. Night setback control

      8. Enthalpy switchover (economizer)

      9. Peak demand limiting

      10. Temperature-compensated duty cycling

      11. Fan speed/CFM control

      12. Heating/cooling interlock

      13. Cold deck reset

      14. Hot deck reset

      15. Hot water reset

      16. Chilled water reset

      17. Condenser water reset

      18. Chiller sequencing

    4. All programs shall be executed automatically without the need for operator intervention and shall be flexible enough to allow user customization. Programs shall be applied to building equipment as described in the Sequence of Operations.

    5. Alarm management shall be provided to monitor and direct alarm information to operator devices. Each DDC Controller shall perform distributed, independent alarm analysis and filtering to minimize operator interruptions due to non-critical alarms, minimize network traffic and prevent alarms from being lost. At no time shall the DDC Controllers ability to report alarms be affected by either operator or activity at a PC workstation, local I/O device or communications with other panels on the network.

      1. All alarm or point change reports shall include the point's English language description and the time and date of occurrence.

      2. The user shall be able to define the specific system reaction for each point. Alarms shall be prioritized to minimize nuisance reporting and to speed operator response to critical alarms. A minimum of six priority levels shall be provided for each point. Point priority levels shall be combined with user definable destination categories (PC, printer, DDC Controller, etc.) to provide full flexibility in defining the handling of system alarms. Each DDC Controller shall automatically inhibit the reporting of selected alarms during system shutdown and start-up. Users shall have the ability to manually inhibit alarm reporting for each point.

      3. Alarm reports and messages will be directed to a user-defined list of operator devices or PCs.

      4. In addition to the point's descriptor and the time and date, the user shall be able to print, display or store a 200-character alarm message to more fully describe the alarm condition or direct operator response.

        1. Each DDC Controller shall be capable of storing a library of at least 50 alarm messages. Each message may be assignable to any number of points in the Controller.

      5. In dial-up applications, operator-selected alarms shall initiate a call to a remote operator device.

    6. A variety of historical data collection utilities shall be provided to manually or automatically sample, store and display system data for points as specified in the I/O summary.

      1. DDC Controllers shall store point history data for selected analog and digital inputs and outputs:

        1. Any point, physical or calculated may be designated for trending. Any point, regardless of physical location in the network, may be collected and stored in each DDC Controllers point group. Two methods of collection shall be allowed: either by a pre-defined time interval or upon a pre-defined change of value. Sample intervals of l minute to 7 days shall be provided. Each DDC Controller shall have a dedicated RAM-based buffer for trend data and shall be capable of storing a minimum of 10,000 data samples.

      2. Trend data shall be stored at the DDC Controllers and uploaded to the workstation when retrieval is desired. Uploads shall occur based upon either user-defined interval, manual command or when the trend buffers are full. All trend data shall be available for use in 3rd party personal computer applications.

       

    7. DDC Controllers shall automatically accumulate and store run-time hours for digital input and output points as specified in the point I/O summary.

      1. The totalization routine shall have a sampling resolution of one minute or less.

      2. The user shall have the ability to define a warning limit for run-time totalization. Unique, user-specified messages shall be generated when the limit is reached.

    8. DDC Controllers shall automatically sample, calculate and store consumption totals on a daily, weekly or monthly basis for user-selected analog and digital pulse input type points as specified in the point I/O summary.

      1. Totalization shall provide calculation and storage of accumulations of up to 99,999.9 units (e.g., kWh, gallons, BTU, tons, etc.).

      2. The totalization routine shall have a sampling resolution of one minute or less.

      3. The user shall have the ability to define a warning limit. Unique, user-specified messages shall be generated when the limit is reached.

    9. DDC Controllers shall have the ability to count events such as the number of times a pump or fan system is cycled on and off. Event totalization shall be performed on a daily, weekly or monthly basis for points as specified in the point I/O summary.

      1. The event totalization feature shall be able to store the records associated with a minimum of 9,999.9 events before reset.

      2. The user shall have the ability to define a warning limit. Unique, user-specified messages shall be generated when the limit is reached.

2.5 APPLICATION SPECIFIC CONTROLLERS (ASC)

    1. Each DDC Controller shall be able to extend its performance and capacity through the use of remote application specific controllers (ASCs).

    2. Each ASC shall operate as a stand-alone controller capable of performing its specified control responsibilities independently of other controllers in the network. Each ASC shall be a microprocessor-based, multi-tasking, real-time digital control processor.

    3. Central System Controllers:

      1. Controllers shall include all point inputs and outputs necessary to perform the specified control sequences. Provide a hand/off/automatic switch for each digital output for manual override capability. Switches shall be mounted either within the controller's key-accessed enclosure, or externally mounted with each switch keyed to prevent unauthorized overrides. In addition, each switch position shall be supervised in order to inform the system that automatic control has been overridden. As a minimum, 50% of the point inputs and outputs shall be of the Universal type, allowing for additional system flexibility.

      2. Each controller shall support its own real-time operating system. Provide a time clock with battery backup to allow for stand-alone operation in the event communication with its DDC Controller is lost and to insure protection during power outages.

      3. Provide each central system controller with sufficient memory to accommodate point databases, operating programs, local alarming and local trending. All databases and programs shall be stored in non-volatile EEPROM or a minimum of 72-hour battery backup shall be provided. All programs shall be field-customized to meet the user's exact control strategy requirements.

      4. Programming of central system controllers shall utilize the same language and code as used by DDC Controllers to maximize system flexibility and ease of use. Should the system controller utilize a different control language, provide an DDC Controller to meet the specified functionality.

      5. Local alarming and trending capabilities shall be provided for convenient troubleshooting and system diagnostics. Alarm limits and trend data information shall be user-definable for any point.

      6. Each controller shall have connection provisions for a portable operator's terminal. This tool shall allow the user to display, generate or modify all point databases and operating programs. All new values and programs may then be restored to EEPROM via the programming tool.

    4. Terminal Equipment Controllers:

      1. Provide for control of each piece of equipment , including, but not limited to, the following:

                  1. Variable Air Volume (VAV ) boxes

                  2. Constant Air Volume (CAV) boxes

                  3. Fan Coil Units

                  4. Room Pressure Controllers

      2. Controllers shall include all point inputs and outputs necessary to perform the specified control sequences. Analog outputs shall be industry standard signals such as 24V floating control, allowing for interface to a variety of modulating actuators. Terminal equipment controllers utilizing proprietary control signals and actuators shall not be acceptable.

      3. Each controller performing space temperature control shall be provided with a matching room temperature sensor.

        1. The sensor may be either RTD or thermistor type providing the following minimum performance requirements are met:

          1. Accuracy: ± 1°F (±0.6°C)

          2. Set Point Adjustment Range: 55° to 95°F (2° to 30°C)

          3. Set Point Modes: Independent Heating, Cooling, Night Setback Heating, Night Setback-Cooling

          4. Calibration Adjustments: None required

          5. Installation: Up to 100 ft. from Controller

        2. Each room temperature sensor shall include a terminal jack integral to the sensor assembly. The terminal jack shall be used to connect an adjustment tool to control and monitor all hardware and software points associated with the controller.

        3. Each room sensor shall also include the following :

          1. Setpoint Adjustment Slide, one-degree increments from 55 to 95 deg F.

          2. Digital Temperature Indicator.

          3. Override Switch

        4. The setpoint adjustment shall allow for modification of the temperature by the occupant. Setpoint adjustment may be locked out, overridden or limited as to time or temperature through software by an authorized operator at the central workstation, DDC Controller or via the adjustment tool.

        5. The temperature indicator shall be a digital display and visible without removing the sensor cover.

        6. An override switch shall initiate override of the night setback mode to normal (day) operation when activated by the occupant. The override function may be locked out, overridden or limited as to the time through software by an authorized operator at the central workstation, DDC Controller or via the adjustment tool.

      4. Each controller shall perform its primary control function independent of other DDC Controller LAN communication, or if LAN communication is interrupted. Reversion to a fail-safe mode of operation during LAN interruption is not acceptable. The controller shall receive its real-time data from the DDC Controller time clock to insure LAN continuity. Each controller shall include algorithms incorporating proportional, integral and derivative (PID) gains for all applications. All PID gains and biases shall be field-adjustable by the user via terminals as specified herein. This functionality shall allow for tighter control of space conditions and shall facilitate optimal occupant comfort and energy savings. Controllers that incorporate proportional and integral (PI) control algorithms only shall not be acceptable.

      5. Provide each terminal equipment controller with sufficient memory to accommodate point databases, operating programs, local alarming and local trending. All databases and programs shall be stored in non-volatile EEPROM, EPROM and PROM, or minimum of 72-hour battery backup shall be provided. The controllers shall be able to return to full normal operation without user intervention after a power failure of unlimited duration. Provide uninterruptible power supplies (UPSs) of sufficient capacities for all terminal controllers that do not meet this protection requirement. Operating programs shall be field-selectable for specific applications. In addition, specific applications may be modified to meet the user's exact control strategy requirements, allowing for additional system flexibility. Controllers that require factory changes of all applications are not acceptable.

      6. When pneumatic actuation is required, utilize floating point to pneumatic transducers for signal conversion.

2.6 OPERATOR’S TERMINALS

    1. Reuse the existing Operators Terminals located throughout the University. All alarm conditions will be reported to all owner defined terminals.

2.7 PERSONAL COMPUTER OPERATOR WORKSTATION HARDWARE

    1. Personal computer operator workstations will be reused or provided by the owner for use on any existing communication line.

2.8 FIELD DEVICES

    1. All devices and equipment shall be approved for installation by the University of Rochester.

      1. Temperature Sensors

      2. Humidity Sensors

      3. Pressure Sensors

      4. Dampers

      5. Damper Operators

      6. Automatic Control Valves, Electronic and Pneumatic types.

      7. Air Volume Measurement

      8. Current Sensing Relays

      9. Firestats

      10. Freezestats

      11. Electric Thermostats

      12. Electronic-to-Pneumatic Transducers

      13. Differential Pressure Switch

      14. Solenoid Air Valves (EP)

      15. Pressure Electric Switch (PE)

      16. Instrument Air Supply

      17. Refrigerated Air Dryer

      18. Control Air Piping

      19. Control Wiring

2.9 ROOM PRESSURE INDICATORS

    1. Mechanical swing-vane anemometer.

    2. Indicates negative pressure airflow. Room in which indicator is located is negative with respect to the adjacent space.

    3. Measures air velocities from 25-400 (+/- 5%) feet per minute.

    4. No calibration or periodic maintenance required for indicator except for periodic cleaning with camera lens cleaning compressed air.

    5. Constructed of type 304 stainless steel and acrylic. Stainless steel screen cover plate provided on the inside of the adjacent room (inlet screen). Stainless steel screen provided on the gauge case (outlet screen).

    6. Built-in bubble level to insure proper, level mounting and accurate readings.

    7. Installs in a 2" x 4 ½" mounting hole. Size of monitor shall be custom fit to the thickness of the wall in which it is installed.

    8. Lifetime warranty on the indicator.

    9. Provide with fiber optic "low" alarm with adjustable time delay, fully labeled alarm panel, occupied/unoccupied key switch, 24 VAC primary input power supply, alarm relay for dry contact output, and enclosure mounted terminal strips labeled to correspond to wiring diagrams.

    10. Provide complete wiring diagrams.

    11. Design Equipment: Lamiflow

2.10 EXHAUST ISOLATION DAMPERS
    1. Provide exhaust isolation dampers equivalent to gas-tight butterfly valves with normally open spring-return actuators.
    2. Dampers shall be dynamically pressure tested to hold 2" w.g. for 10 minutes and statically pressure tested to hold a minimum of 3" w.g. for 10 minutes.
    3. Design Equipment: NUAIRE Model NU-950-XXX

PART 3 - EXECUTION

    1. SEQUENCE OF OPERATION

    1. Refer to specification section entitled SEQUENCE OF OPERATION.

    1. ELECTRICAL INSTALLATION

    1. Electric Wiring

      1. Furnish all labor and materials to install the necessary wiring for the new automation system

      2. Furnish all labor and materials to install necessary relays, general-purpose enclosures and appurtenances to control designated devices relative to the BAS.

      3. All wiring throughout shall be concealed where possible.

      4. All conduit used shall be PVC Schedule 40, ½" minimum size. Conduit size shall be large enough to permit the individual conductors to be readily installed or withdrawn without damage to the conductors or their insulation. Splicing of wire will permitted only in junction boxes or pull boxes.

      5. Conduit shall not be relied upon for a fault current and safety ground return conductor.

      6. The ground system must never be used as a current carrying conductor except for faults and noise suppression. The stand-alone DDC panel grounding system shall be used to control noise and transients that might affect the operation of the automation system. As such, the ground requirements are in excess of a grounding system used solely for physical protection minimum.

      7. In all cases, the bond to ground shall be as short as possible. A ground point shall be derated by (1) point for each 50’-0" of conductor run between it and the automation equipment to be grounded. Therefore, a water pipe bond located 10’-0" away will be preferable to a structural steel bond located 150’-0" away.

      8. Setscrew connectors shall be galvanized or plated steel. White metal cast type will not be permitted.

      9. Flexible conduit shall be used at field devices, i.e., pressure switches, flow switches, temperature devices, etc. Convolutions shall be steel, interlocked continuously. Aluminum will not be permitted. "Liquidtight" shall be used in wet locations.

      10. Only core drilling is permitted to pierce the floors in the electrical closets and elsewhere. The use of water for drilling shall be controlled by suitable vacuum systems; using proper dams to prevent damaged to floors below.

      11. All low voltage wiring in exposed areas, outside air plenums, mechanical/electrical rooms and areas which may be subject to mechanical abuse shall be run in EMT or as noted below:

        12. a. Sensor to Panel (Block Wall) In New Conduit/PVC

        b. Sensor to Panel (Stud Wall) In Wall

        c. Sensor to Panel (Mechanical Room) In New Conduit/EMT

      12. Wiring

                  1. Control wiring, low voltage 20 AWG

                  2. Control wiring, 120VAC, 14 AWG pair

                  3. Low area network, LAN, 18 AWG twisted shielded pair

                  4. Building network, 24 AWG, pair, low capacitance type

      13. Low voltage wiring not used for life safety/smoke evacuation applications; above suspended ceilings and in accessible concealed areas can be plenum rated cable.

      14. All wiring used for life safety/smoke evacuation shall be in EMT or flexible metal clad conduit. Air handling unit controls including wiring from Fire Command Center to AHU control panel shall be in EMT.

    1. MATERIALS AND EQUIPMENT

    1. General: Provide pneumatic/electronic control products in sizes and capacities indicated, consisting of valves, dampers, thermostats and other components as required for complete installation. Except as otherwise indicated, provide manufacturer's standard materials and components as published in their product information; designed and constructed as recommended by manufacturer, and as required for application indicated.

    2. Air Piping: Seamless copper tubing, Type K or L, ASTM B88; with cast-bronze solder joint fittings, ANSI B16.18; or wrought-copper solder-joint fittings, ANSI B16.22; except brass compression type fittings at connections to equipment.

    3. Air Piping: Virgin polyethylene non-metallic tubing, ASTM D 2737, and with flame-retardant harness for multiple tubing. Use compression or push-on polyethylene fittings.

    4. Control Valves: Provide factory fabricated pneumatic/electronic control valves of type, body material and pressure class indicated. Where type or body material is not indicated, provide selection, as determined by manufacturer, for installation requirements and pressure class, based on maximum pressure and temperature in piping system. Provide valve size in accordance with scheduled or specified maximum pressure drop across control valve. Equip control valves with actuators, with proper shut-off rating for each individual application.

      1. Water Service Valves: Equal percentage characteristics with rangeability of 50 to 1, and maximum full flow pressure drop of 5 PSIG.

      2. Steam Service Valves: Linear characteristics with rangeability of 30 to 1, and maximum full flow pressure drop of 80% of inlet pressure for low pressure systems, and 42% for high pressure systems.

      3. Single Seated Valves: Cage type trim, providing seating and guiding surfaces for plug-on "top and bottom" guided plugs.

      4. Double Seated Valves: Balanced plug type, with cage type trim providing seating and guiding surfaces on "top and bottom" guided plugs.

      5. Valve Trim and Stems: Polished stainless steel

      6. Packing: Spring-loaded Teflon, self-adjusting

    5. Dampers: Provide automatic control dampers, as indicated, with damper frames not less than formed 13-gauge galvanized steel. Provide mounting holes for enclosed duct mounting. Provide damper blades not less than formed 16-gauge galvanized steel, with maximum blade width of 8".

      1. Secure blades to 1/2" diameter zinc-plated axles using zinc-plated hardware. Seal off against spring stainless steel blade bearings. Provide blade bearings of nylon and provide thrust bearings at each end of every blade. Construct blade linkage hardware of zinc-plated steel and brass. Submit leakage and flow characteristics plus size schedule for controlled dampers.

      2. Operating Temperature Range: From -20 to 200oF.

      3. All dampers are to be low leakage type. Provide parallel or opposed blade design (as selected by manufacturer's sizing techniques) with replaceable rubber seals rated for leakage less than 10 CFM/sq. ft. of damper area, at differential pressure 4" w.g. when damper is being held by torque of 50 inch-pounds.

    6. Pneumatic/Electronic Operators: Size actuators to operate their appropriate dampers or valves with sufficient reserve power to provide smooth modulating action or 2-position action as specified. When so specified in sequence of operation, where more than 2 actuators are to be operated in sequence to each other, provide position feedback positive positioners with adjustable start point and operating range.

    1. CONTROL AIR PIPING

    1. General: Install systems and materials in accordance with manufacturer's instructions, roughing-in drawings and details shown on drawings.

    2. Control Air Piping: Accessible tubing is defined as that tubing run in mechanical equipment rooms; inside mechanical equipment enclosures, such as heating and cooling units, instrument panels etc.; in pipe chases, or suspended ceilings with easy access. Inaccessible tubing is defined as that tubing run in concrete slabs; furred walls; or ceiling with no access.

      1. Provide copper tubing with maximum unsupported length of 3'-0", for accessible tubing run exposed to view. Polyethylene tubing may be used in lieu of above, when run within adequately supported, rigid enclosure, such as metallic raceways, EMT, or PVC pipe. Terminal single-line connections less than 18" in length may be copper tubing, or polyethylene tubing run inside flexible steel protection. Accessible tubing run in concealed locations, such as pipe chases, suspended ceilings with easy access, etc., may be copper or polyethylene bundled and sheathed tubing.

      2. Provide copper or polyethylene tubing for inaccessible tubing, other than in concrete pour. If polyethylene tubing is used, install in EMT or vinyl-jacketed polyethylene tubing.

      3. Provide copper or polyethylene tubing when installed in concrete pour. If copper is used, protect at floor line with EMT extending 6" above floor and 6" into pour. Pressure test before and after pour for leak and pinch. If polyethylene is used, provide EMT conduit in pour and extend 6" above floor line; pull tubing through conduit after pour. Polyethylene bundle and jacketed tubing may be run in pour without EMT protection, except at floor line.

      4. Fasten flexible connections bridging cabinets and doors, neatly along hinge side, and protect against abrasion. Tie and support tubing neatly.

      5. Number-code or color-code tubing, except local individual room control tubing, for future identification and servicing of control system.

    1. ROOM PRESSURE INDICATORS

    1. Mark and then cut a 4 ½" x 3 ½" hole in the location where the indicator is to be installed. Verify final mounting location with the Owner and Engineer prior to cutting the hole.

    2. Tests fit the indicator in the hole and modify the hole as necessary to obtain proper fit; remove indicator from hole in wall. Mark the four (4) mounting holes on each side of the wall and drill mounting holes with ¼" drill bit. Tap the eight (8) plastic anchors into the eight (8) mounting holes.

    3. Insert the indicator into the wall and make certain that the indicator is level by using the pre-installed bubble level indicator. Once the unit is leveled, tighten and fasten both sides with screws and washers. Caulk around the inside and outside mounting plates with a minimal bead of caulk to ensure no air leakage around the mounting plates.

    4. Clean the indicator with camera lens compressed air to remove any construction or shipping debris. Do not bend or pull the flutter strip. Damaged indicators shall be replaced at no cost to the Owner.

    1. ON-SITE TESTING

    1. Provide Engineer-approved operation and acceptance testing of the complete system. The Engineer will witness all tests.

    2. Compliance Inspection Checklist: Submit in the form requested, the following items of information to the Owner's Representative and Architect/Engineer for verification of compliance to the project specifications. Failure to comply with the specified information shall constitute non-performance of the contract. The contractor shall submit written justification for each item in the checklist that he is unable to comply with. The Owner's Representative and the Architect/Engineer will initial and date the checklist to signify contractor's compliance before acceptance of system.

    1. SERVICE AND GUARANTEE

    1. General Requirements: Provide all services, materials and equipment necessary for the successful operation of the entire BAS system for a period of one year after completion of successful performance test. Provide necessary material required for the work. Minimize impacts on facility operations when performing scheduled adjustments and non-scheduled work.

    2. Description of Work: The adjustment and repair of the system includes all computer equipment, software updates, transmission equipment and all sensors and control devices. Provide the manufacturer's required adjustments and all other work necessary.

    3. Personnel: Provide qualified personnel to accomplish all work promptly and satisfactorily. Owner shall be advised in writing of the name of the designated service representative, and of any changes in personnel.

    1. GRAPHICS

    1. Provide labor and materials to provide computer graphics for the Building Automation System as part of the above referenced project. The graphics shall consist of three levels of information. Each floor or area in the project shall have each of the levels. The first level of information (Hot Button Format) shall consist of each point in the DDC system for the floor. The points shall be arranged in rows and columns for display and ease of viewing. The values on this screen shall be reported in real time as well as dynamic to be updated as the value change. The second level of graphics shall be all the DDC points to be installed under the contract, overlaid on building floor plan. Electronic floor plans to be provided by Architect/Engineer. The third level shall consist of an air handling schematic (same graphic as in the submittal). All DDC points to be installed under the contract shall be displayed on the screen. The written description of operation shall be included for operator reference. The values shall be reported in real time and dynamic to be updated as the value change. Operators shall have the ability to change set points from the screen. All screens shall be linked so that the operators can move back and forth from each screen.
    2. Refer to Exhibits at the end of this section for typical formats.

 

    1. TRAINING

    1. The Contractor shall provide competent instructors to give full instruction to designated personnel in the adjustment, operation and maintenance of the system installed rather than a general training course. Instructors shall be thoroughly familiar with all aspects of the subject matter they are to teach. All training shall be held during normal work hours of 8:00 a.m. to 4:30 p.m. weekdays as follows:

    2. Provide 8 hours of training for Owner's operating personnel.

 

 

 

END OF SECTION