Addendum 2 Specifications Section 15975.pdf

MS0109

15975-1

SECTION 15975: DIRECT DIGITAL CONTROL SYSTEMS

PART 1 GENERAL

1.01 RELATED SPECIFICATION SECTIONS:

A. Section 01000 – GENERAL REQUIREMENTS

1.02 WORK INCLUDED

A. Direct Digital Control (DDC) Systems for HVAC Systems.

B. Software.

1.03 REFERENCES: The publications listed below form a part of this specification to the extent referenced.

The publications are referred to in the text by basic designation only.

A. AIR-MOVEMENT AND CONTROL ASSN, INC (AMCA)

AMCA 500 - (1983; R Jul 86) Test Methods for Louvers, Dampers and Shutters

B. AMERICAN NATIONAL STANDARDS INSTITUTE, INC (ANSI)

ANSI B40.1 - (1985) Gauges-Pressure Indicating Dial Type-Elastic Element

C. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

1. ASTM A 269 -(1987a) Seamless and Welded Austenitic Stainless Steel Tubing for General Service

2. ASTM B 88 - (1988a) Seamless Copper Water Tube ASTM D 635 (1981) Rate of Burning and/or

Extent of Time of Burning of Self-Supporting Plastics in a Horizontal Position

3. ASTM D 1693 - (1970; R 1980) Environmental Stress-Cracking of Ethylene Plastics

D. FEDERAL COMMUNICATIONS COMMISSION (FCC)

FCC Part 15 - (Vol II, Jul 1986) Radio Frequency Devices

E. FEDERAL SPECIFICATIONS (FS)

FS GG-T-321 - (Rev D; Am 2) Thermometers, Self-Indicating Liquid-in-Glass for Machinery and Piping

Systems

F. INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, INC (IEEE)

IEEE No. 587 - (1980) Guide for Surge Voltage in Low Voltage AC Power Circuits

G. NATIONAL ELECTRICAL MANUFACTURERS ASSN (NEMA)

NEMA 250 - (1979) Enclosures for Electrical Equipment Incl Rev 1 (1000 Volts Maximum)

H. UNDERWRITERS LABORATORIES, INC (UL)

1. UL 94 - (Rev through Mar 3, 1986) Test for Flammability of Plastic Materials for Parts in Devices and

Appliances

2. UL 916 - (1984) Energy Management Equipment

1.04 GENERAL REQUIREMENTS

A. Standard Products: Material and equipment shall be standard products of a manufacturer regularly engaged in the manufacturing of such products, which are of a similar material, design and workmanship.

The standard products shall have been in a satisfactory commercial or industrial use for 2 years prior to bid opening. The 2-year use shall include applications of equipment and materials under similar circumstances and of similar size. The 2 years experience must be satisfactorily completed by a product which has been sold or is offered for sale on the commercial market through advertisements, manufacturers' catalogs, or brochures. Products having less than a 2-year field service record will be acceptable if a certified record of satisfactory field operation, for not less than 6000 hours exclusive of the manufacturer's factory tests, can be shown. The equipment items shall be supported by a service organization. The Contractor shall submit a certified list of qualified permanent service organizations and qualifications. These service organizations shall be reasonably convenient to the equipment on a regular and emergency basis during the warranty period of the contract.

15975-2

B. Identical Items: Items of the same classification as specified in PART 2 - PRODUCTS shall be identical, including equipment, assemblies, parts, and components.

C. Nameplates, Lens Caps, and Tags: Nameplates and lens caps bearing legends as shown and tags bearing device unique identifiers as shown shall have engraved or stamped characters. Nameplates shall be mechanically attached to HVAC control panel interior doors. A plastic or metal tag shall be mechanically attached directly to each field-mounted device or attached by a metal chain or wire. Each air flow measurement station shall have a tag showing flow rate range for signal output range, duct size, and identifier as shown.

D. Verification of Dimensions: The Contractor shall become familiar with all details of the work, shall verify all dimensions in the field, and shall advise the Contracting Officer of any discrepancy before performing any work.

E. Drawings: Because of the small scale of the drawings, it is not possible to indicate all offsets, fittings, and accessories that may be required. The Contractor shall carefully investigate the mechanical, electrical, and finish conditions that could affect the work to be performed, shall arrange such work accordingly, and shall furnish all work necessary to meet such conditions.

F. Power-Line Surge Protection: All equipment connected to ac circuits shall be protected from power-line surges. Equipment protection shall meet the requirements of IEEE No. 587. Fuses shall not be used for surge protection.

G. System Support: The contractor shall provide 1 year of system support for all hardware in the control system at no additional cost to the building owner. System support shall include trouble-shooting, calibration, hardware replacement and other required services to maintain fully functioning, calibrated HVAC control systems. The system support service shall be available 5 days per week between 9 am and 4 pm. During the 1 year system support period, the contractor shall maintain a duplicate set of HVAC control drawings. At the owner's option, control problems will be solved by verbal instruction or on-site correction by the contractor. The number of system support calls and site visits shall be unlimited during the 1 year support period.

1.05 SUBMITTALS:

A. Submit shop drawings and product data.

B. Detail Drawings

1. Detail drawings shall be submittal. Detail drawings shall include: a drawing index; a list of symbols; a series of drawings for each HVAC control system using abbreviations, symbols, nomenclature and identifiers as shown on the contract drawings; valve schedules; damper schedules; and a compressed-air station schematic on 34-inch by 22-inch sheets. Detail drawings shall also include:

equipment data, product specific catalog cuts, and an ASME air-storage tank certificate. All detail drawings shall be delivered together as a complete submittal. Valve and damper schedules may be submitted in advance but shall be included in the complete submittal.

2. Each control-system element on a drawing shall have a unique identifier as shown.

3. Each series of drawings for an HVAC control system shall include a schematic as shown, a ladder diagram as shown, an equipment schedule as shown, a wiring diagram, a list of equipment with manufacturer and model number, a control-panel arrangement drawing, and an HVAC control-system sequence of operation.

4. The wiring diagram shall show the interconnection of conductors and cables to HVAC control-panel terminal blocks and to the identified terminals of starters and packaged equipment, with all necessary jumpers and ground connections. The wiring diagram shall show the labels of all conductors. All sources of power required for HVAC control systems and for packaged-equipment control systems shall be identified back to the panel board circuit breaker number, HVAC system control panel, magnetic starter, or packaged control equipment circuit. Each power supply and transformer not integral to a controller, starter, or packaged equipment shall be shown. The connected volt-ampere load and the power supply volt-ampere rating shall be shown.

5. The HVAC control-panel arrangement drawing shall show nameplate legends, fabrication details, and enclosure operating temperature-rise calculations. Fabrication details shall include interior door front and rear views, back panel layout and terminal block layout.

15975-3

6. The sequence of operation for each HVAC control system shall be in the language and format shown on the drawings. No operational deviations from specified sequences will be permitted without prior written approval of the Contracting Officer. The sequence of operation shall refer to each device by its unique identifier.

7. The valve schedule shall include each valve's unique identifier, size, flow coefficient (Cv), pressure drop at specified flow rate, spring range, positive-positioner range, and actuator size, supported by close-off pressure data, dimensions, operation rate, and access and clearance requirements data.

8. The damper schedule shall contain each damper's and each actuator's identifier, nominal and actual sizes, orientation of axis and frame, direction of blade rotation, spring ranges, operation rate, positive-positioner ranges, locations of actuators and damper end switches, arrangement of sections in multi-section dampers, and methods of connecting dampers, actuators, and linkages. The damper schedule shall include the maximum expected velocity through the damper at the intended location and the maximum leakage rate at the operating static-pressure differential. The damper schedule shall contain actuator selection data supported by calculations of the torque required to move and seal the dampers, access and clearance requirements.

9. The equipment data shall be in booklet form, and indexed to the unique identifiers, and shall consist of data sheets that document compliance with the specification and a copy of each HVAC control system bill of materials. Catalog cuts shall be in booklet form indexed by device type. Where multiple components are show on a catalog cut, the application specific component shall be marked.

C. Test Reports

1. The Contractor shall submit 4 copies of the site testing procedures. The site testing procedures shall identify each item to be tested and shall clearly describe each test. The test procedures shall include a list of the test equipment to be used for site testing, manufacturer and model number, and the date of calibration and accuracy of calibration within 6 months of the test date.

2. The Contractor shall submit 4 copies of the site testing data. Original copies of all data produced during site testing, including results of each test procedure, shall be turned over to the Government after Government approval of the site tests.

3. The Contractor shall furnish 4 copies of the performance verification test plans and procedures. The test plan and procedures for the performance verification test shall be indexed and submitted in booklet form 60 days before the Contractor's scheduled test dates.

4. The Contractor shall furnish 4 copies of the performance verification test report after completion of a successful test. Documentation of test results for the entire HVAC control system shall be submitted complete, in booklet form and indexed, within 30 days after each test.

D. Training Data

1. The Contractor shall furnish a training course in the maintenance and operation of the HVAC control systems specified 60 days prior to the start of training. The training shall be oriented to the specific systems being installed under this contract. One training manual shall be furnished for each trainee, plus two additional copies delivered for archival storage at the project site. The manuals shall include the agenda, the defined objectives for each lesson, and a detailed description of the subject matter for each lesson. Two copies of audiovisual materials shall be delivered to the Government for archival storage at the project site, either as a part of the printed training manuals or on the same media as that to be used during the training session.

E. Operation and Maintenance Manuals

1. The Contractor shall furnish 4 complete copies of operation manuals for each HVAC control system, in booklet form and indexed, outlining the step-by-step procedures required for each HVAC control system's startup, operation, and shutdown. The manuals shall include all detail drawings, equipment data, each controller's configuration check sheet and manufacturer supplied operation manuals for all equipment.

2. The Contractor shall furnish 4 complete copies of maintenance manuals, indexed in booklet form listing maintenance procedures. The maintenance instructions shall include a maintenance check list for each HVAC control system. Maintenance manuals shall include spare parts data and recommended maintenance tool kits for all control devices. Maintenance instructions shall include recommended repair methods, either field repair, factory repair, or whole-item replacement.

3. If operation and maintenance manuals are provided in a common volume, they shall be clearly differentiated and separately indexed.

15975-4

F. Operating Instructions

1. Commissioning Procedures shall be provided for each HVAC control system, and for each type of terminal-unit control system. The procedures shall reflect the language and format shown. The commissioning procedures shall refer to the devices by their unique identifiers as shown. The commissioning procedures shall include step-by-step configuration procedures for each controller.

The configuration procedures shall be product specific and shall include a configuration check sheet showing all configuration parameters, dip switch settings, initial recommended P, I and D constants.

2. The Contractor shall provide 4 copies of Commissioning Procedures, in booklet form and indexed, for each type of control device provided, such as controllers, pilot positioners, adjustable relays, and transmitters. Commissioning procedures shall include general instructions on how to set control parameters, including: setpoints; proportional, integral, and derivative mode constants; contact output settings for the specific devices provided. Commissioning procedures shall be specific to each HVAC system, shall detail the steps involved, and shall refer to the procedures in the booklet for specific devices. Commissioning procedures shall be submitted 60 days prior to system commissioning.

G. Records

1. The Contractor shall furnish 4 copies of the calibration, adjustment and commissioning report which shall include controller setpoints and proportional, integral and derivative-mode constant settings, calibration data for all instruments and controls, and all the data resulting from adjusting the control-system devices and commissioning HVAC control system.

2. The Contractor shall furnish 4 copies of a list of service organizations qualified to service the HVAC control system. The list shall include the service organization name and telephone number.

1.06 DELIVERY AND STORAGE

A. Products shall be stored with protection from the weather, humidity and temperature variations, dirt and dust, and other contaminants, within the storage-condition limits published by the equipment manufacturer. Dampers shall be stored so that seal integrity, blade alignment and frame alignment are maintained.

PART 2 PRODUCTS

2.01 GENERAL EQUIPMENT REQUIREMENTS: The contractor shall provide a Barber Colman/Siebe

Network 8000 Direct Digital Control System as specified below.

A. Barber Colman/Siebe Network 8000 Direct Digital Control System: Barber Colman/Siebe Network

8000 Direct Digital Control System, hereinafter referred to as Barber Colman DDC, shall consist of a Global Control Module with Local Portable Programmer's Terminal, Local Control Modules/Microzone II for air handling units, Local Control Modules/Microzone II for the boiler and chiller, and Variable Air Volume Box Controllers for variable air volume terminals. The system shall be set up for connection to the Base's local area network. The system shall be complete with all sensors, wiring, software, and hardware to form a functional HVAC automation system. Sensors, sensor wiring, gauges, thermometers and other accessories which are not part of the packaged Network 8000 system or Local Area Network shall be as specified hereinafter. Training shall be provided in accordance with paragraph 3.06 TRAINING. Control system submittals shall be made in accordance with paragraph 1.05 SUBMITTALS.

In addition to the hardware and software required at the building, the contractor shall also provide the following software development for the existing Barber Colman Network 8000 Host System located in the Energy Management Control System (EMCS) section of Base Civil Engineering.

1. Graphical Building Representation: A graphical building representation with room names and room numbers shall be created for the Host System. The software shall allow logical routing from the room to the boiler and/or chiller through all intermediate items of equipment. At each level, the user shall be able to route to the previous display, the next logical equipment item, or the main building plan.

User interface shall be roller mouse or digitizer for this operation. All building related attributes such as room setpoints, occupied schedules, etc. shall be displayed real-time and accessible from the graphic screen for modification.

2. Graphical System Schematics: A graphical system schematic for each air handling unit, chiller, pump, boiler, and variable air volume terminal shall be supplied with all sensed parameters displayed.

In addition to the sensed parameters, system schematics including water coils shall display the chilled water or hot water supply temperature as measured at the chiller or boiler respectively. All

15975-5 system related attributes such as equipment control setpoints, throttling ranges, operating schedules, etc. shall be displayed real-time and accessible from the graphic screen for modification.

3. System Support: The contractor shall provide 1 year system support for all hardware and software in the control system at no additional cost to the building owner. System support shall include modem communication between the contractor and the building, the contractor and the EMCS host, and voice communication between the owner and the contractor. The system support service shall be available 5 days per week between 9 am and 4 pm. During the 1 year system support period, the contractor shall maintain a duplicate set of building software on his support computer. At the owner's option, software problems will be solved by verbal instruction, remote correction by the contractor on the support computer keyboard, or on site correction by the contractor. The number of system support calls shall be unlimited during the 1 year period.

B. Electrical and Electronic Devices

1. All electrical, electronic, and electro-pneumatic devices not located within an HVAC control panel shall have an enclosure NEMA 1 in accordance with NEMA 250 unless otherwise shown.

2. Standard Signals: The output of all analog transmitters and the analog input and output of all single-loop controllers and function modules shall be 4-to-20 mAdc signals. The signal shall originate from current-sourcing devices and shall be received by current-sinking devices.

C. Ambient Temperature Limits

1. Actuators and positive positioners, and transmitters shall operate within temperature limit ratings of plus 35 to 150 degrees F. All panel-mounted instruments shall operate within limit ratings of 35 to 120 degrees F and 10 percent to 95 percent relative humidity, noncondensing. All devices installed outdoors shall operate within limit ratings of minus 35 to 150 degrees F.

2.02 MATERIALS

A. Tubing

1. Copper: Copper tubing shall conform to ASTM B 88 and shall have sweat fittings and valves. Plastic tubing shall have barbed fittings and valves. Plastic tubing shall have the burning characteristics of linear low-density polyethylene tubing, shall be self-extinguishing when tested in accordance with ASTM D 635, shall have UL 94 V-2 flammability classification, and shall withstand stress cracking when tested in accordance with ASTM D 1693. Plastic-tubing bundles shall be provided with mylar barrier and flame-retardant polyethylene jacket.

2. Stainless Steel: Stainless steel tubing shall conform to ASTM A 269, and shall have stainless steel compression fittings.

B. Wiring

1. Terminal Blocks: Terminal blocks shall be insulated, modular, feed-through, clamp style with recessed captive screw-type clamping mechanism, shall be suitable for rail mounting, and shall have end plates and partition plates for separation or shall have enclosed sides.

2. Control Wiring for 24-Volt Circuits: Control wiring for 24-volt circuits shall be 18 AWG minimum and shall be rated for 300-volt service.

3. Wiring for 120-Volt Circuits: Wiring for 120-volt circuits shall be 14 AWG minimum and shall be rated for 600-volt service.

4. Analog Signal Wiring Circuits: Analog signal wiring circuits within control panels shall not be less than 20 AWG and shall be rated for 300-volt service.

5. Instrumentation Cable: Instrumentation cable shall be 18 AWG, stranded copper, single or multiple-twisted, minimum 2-inch lay of twist, 100% shielded pairs, and shall have a 300-volt insulation. Each pair shall have a 20-AWG tinned-copper drain wire and individual overall pair insulation. Cables shall have an overall aluminum-polyester or tinned-copper cable-shield tape, overall 20-AWG tinned-copper cable drain wire, and overall cable insulation.

6. Non-conducting Wiring: Non-conducting wiring duct in control panels shall have slotted sides, snap-on duct covers, fittings for connecting ducts, mounting clips for securing ducts, and wire-retaining clips.

2.03 ACTUATORS

A. General Requirements: Actuators shall fail to their spring-return positions as shown on signal or power failure and shall have a visible position indicator. Actuators shall open or close the devices to which they are applied within 60 seconds after a full scale input signal change. Electric or electronic actuators

15975-6 operating in parallel or in sequence shall have an auxiliary actuator driver. Actuators shall be electronic.

1. Damper Actuators: Damper actuators shall be rated for at least 125 percent of the motive power necessary to operate against the pressure shown. The actuator stroke shall be limited by an adjustable stop in the direction of power stroke. The actuators shall be provided with mounting and connecting hardware.

2. Valve Actuators: Valve actuators shall be rated for at least 125 percent of the motive power necessary to operate the valves over their full range of operation against the total and differential pressures shown.

2.04 AUTOMATIC CONTROL VALVES

A. Valve Assembly: Valves shall have stainless-steel stems and stuffing boxes with extended necks to clear the piping insulation. Valve bodies shall be designed for not less than 125 psig working pressure or 150 percent of the system operating pressure, whichever is greater. Valve leakage rating shall be .01 percent of rated Cv.

B. Butterfly-Valve Assembly: Butterfly valves shall be threaded lug type suitable for dead-end service, and for modulation to the fully-closed position, with carbon-steel bodies and non-corrosive discs, stainless steel shafts supported by bearings, and EPDM seats suitable for temperatures from minus 20 degrees to plus 250 degrees F. Valves shall have a manual means of operation independent of the actuator.

C. Two-Way Valves: Two-way modulating valves shall have equal-percentage characteristics.

D. Three-Way Valves: Three-way valves shall provide linear flow control with constant total flow throughout full plug travel.

E. Duct-Coil and Terminal-Unit-Coil Valves: Control valves with flare-type ends shall be provided for duct or terminal-unit coils. Flare nuts shall be furnished for each flare-type end valve.

F. Valves for Chilled-Water, Condenser-Water, and Glycol Service:

1. Bodies for valves 1-1/2 inches and smaller shall be brass or bronze, with threaded or union ends.

Bodies for valves from 2 inches to 3 inches inclusive shall be of brass, bronze or iron. Bodies for 2-inch valves shall have threaded ends. Bodies for valves from 2-1/2 inches to 3 inches shall have flanged-end connections. Valve Cv shall be 100 percent to 110 percent of the Cv shown. Internal valve trim shall be brass or bronze except that valve stems may be type 316 stainless steel.

2. Valves 4 inches and larger shall be butterfly valves.

G. Valves for Hot-Water Service Below 250 Degrees F:

1. Bodies for valves 1-1/2 inches and smaller shall be brass or bronze, with threaded or union ends.

Bodies for 2-inch valves shall have threaded ends. Bodies for valves 2-1/2 inches to 3 inches shall have flanged-end connections. Valve Cv shall be 100 percent to 110 percent of the Cv shown.

2. Internal trim (including seats, seat rings, modulating plugs, and springs) of valves controlling water hotter than 210 degrees F shall be Type 316 stainless steel.

3. Internal trim for valves controlling water 210 degrees F or less shall be brass or bronze.

4. Nonmetallic parts of hot-water control valves shall be suitable for a minimum continuous operating temperature of 250 degrees F or 50 degrees F above the system design temperature, whichever is higher.

5. Valves 4 inches and larger shall be butterfly valves.

2.05 DAMPERS

A. Damper Assembly

1. A single damper section shall have blades no longer than 48 inches and shall be no higher than 72 inches. Maximum damper blade width shall be 8 inches. Larger sizes shall be made from a combination of sections. Dampers shall be steel, or other materials where shown. Flat blades shall be made rigid by folding the edges. All blade-operating linkages shall be within the frame so that blade-connecting devices within the same damper section will not be located directly in the air stream. Damper axles shall be 0.5-inch (minimum) plated steel rods supported in the damper frame by stainless steel or bronze bearings. Blades mounted vertically shall be supported by thrust bearings. Pressure drop through dampers shall not exceed 0.04 inch water gauge at 1,000 fpm in

15975-7 the wide-open position. Frames shall not be less than 2 inches in width. Dampers shall be tested in accordance with AMCA 500.

2. Operating links external to dampers (such as crankarms, connecting rods, and line shafting for transmitting motion from damper actuators to dampers) shall withstand a load equal to at least twice the maximum required damper-operating force. Rod lengths shall be adjustable. Links shall be brass, bronze, zinc-coated steel, or stainless steel. Working parts of joints and clevises shall be brass, bronze, or stainless steel.

3. Adjustments of crankarms shall control the open and closed positions of dampers.

4. Modulating dampers shall be opposed-blade type and two-position dampers shall be parallel-blade type.

B. Outside-Air, Return-Air, and Relief-Air Dampers: The dampers shall be as shown. Blades shall have interlocking edges and shall be provided with compressible seals at points of contact. The channel frames of the dampers shall be provided with jamb seals to minimize air leakage. Dampers shall not leak in excess of 20 cfm per square foot at 4 inches water gauge static pressure when closed. Seals shall be suitable for an operating temperature range of minus 40 degrees F to 200 degrees F. Dampers shall be rated at not less than 2000 fpm air velocity.

C. Mechanical and Electrical Space Ventilation Dampers: The dampers shall be as shown. Dampers shall not leak in excess of 80 cfm per square foot at 4 inches water gauge static pressure when closed.

Dampers shall be rated at not less than 1500 fpm air velocity.

D. Damper End Switches: Each end switch shall be a hermetically-sealed switch with a trip lever and over-travel mechanism. The switch enclosure shall be suitable for mounting on the duct exterior and shall permit setting the position of the trip lever that actuates the switch. The trip lever shall be aligned with the damper blade.

2.06 SMOKE DETECTORS

A. FIRE DETECTING DEVICES: Fire detecting devices shall comply with the applicable requirements of

NFPA 72E, NFPA 90A, UL 268, and UL 521. The detectors shall be provided as indicated. Detector base shall be detachable and have screw terminals for making connections. No solder connections will be allowed. Detectors shall be connected into alarm initiating circuits. Installed devices shall conform to the classification of the area. All fire detecting devices and or detector bases with the exception of flame detectors shall be addressable and shall be dynamically supervised and uniquely identified in the control panel.

1. Smoke Detectors: Detectors shall be designed for detection of abnormal smoke densities. Smoke detectors shall be photoelectric type. Detectors shall contain a visible indicator LED that shows when the unit is in alarm condition. Detectors shall not be adversely affected by vibration or pressure.

Detectors shall be the plug-in type in which the detector base contains terminals for making all wiring connections. Smoke detectors shall be addressable and remotely adjustable from the control panel.

a. Duct Detectors: Duct-mounted photoelectric smoke detectors shall be furnished and installed where indicated. Units shall consist of a Photoelectric Detectors, mounted in a special housing fitted with duct sampling tubes. Sampling tubes shall run the full width of the duct. The duct detector package shall conform to the requirements of NFPA 90A and shall be UL listed for use in air-handling systems. The control functions, operation, reset, and bypass shall be controlled from the fire alarm control panel. All LED'S to indicate the operation and alarm condition and the test and reset buttons shall be visible and accessible with the unit installed and the cover in place. Detector mounted above 6 feet and those mounted below 6 feet shall be readily accessible. Detectors shall have auxiliary contacts to provide control, interlock, and shutdown functions by the fire alarm control panel. Duct detector shall be addressable and controlled by the fire alarm control panel. The detectors shall be supplied by the fire alarm vendor to ensure complete system compatibility.

2.07 INSTRUMENTATION

A. Measurements: Transmitters shall be calibrated to provide the following measurements, over the indicated ranges, for an output of 4 to 20 mAdc:

1. Conditioned space temperature, from 50 to 85 degrees F.

2. Duct temperature, from 40 to 140 degrees F except that return-air temperature for economizer operation shall be minus 30 to plus 130 degrees F.

15975-8

3. Chilled-water temperature, from 30 to 100 degrees F.

4. Heating hot-water temperature, from 100 to 250 degrees F.

5. Outside-air temperature, from minus 30 to 130 degrees F.

6. Relative humidity, 0 to 100 percent for high-limit applications; from 20 to 80 percent for space applications.

7. Differential pressure for VAV supply-duct static pressure from 0 to 2.0 inches water gauge.

B. Temperature Instruments

1. Resistance Temperature Detectors (RTD): Each RTD shall be platinum with a tolerance of plus or minus 0.1 percent at 32 degrees F, and shall be encapsulated in epoxy, series 300 stainless steel, anodized aluminum, or copper. Each RTD shall be furnished with an RTD transmitter as specified, integrally-mounted unless otherwise shown.

a. Continuous-Averaging RTD: Continuous-averaging RTDs shall have a tolerance of plus or minus

1.0 degree F at the reference temperature, and shall be of sufficient length to ensure that the resistance represents an average over the cross-section in which it is installed. The sensing element shall have a bendable copper sheath. Each averaging RTD shall be furnished with an RTD transmitter as specified, to match the resistance range of the averaging RTD.

b. RTD Transmitter: The RTD transmitter shall be selected to match the resistance range of the RTD. The transmitter shall be a 2-wire, loop-powered device. The transmitter shall produce a linear 4-to-20 mAdc output corresponding to the required temperature measurement. The output error shall not exceed 0.1 percent of the calibrated measurement. The transmitter shall include offset and span adjustments.

C. Relative-Humidity Instruments: Relative-humidity sensing element shall use non-saturating sensing elements capable of withstanding a saturated condition without permanently affecting calibration or sustaining damage. Sensing elements shall have an accuracy of plus or minus 5 percent of full scale within the range of 20 to 80 percent relative humidity. A 2-wire, loop-powered transmitter located at the sensing elements shall be provided to convert the sensing elements output to a linear 4-to-20 mAdc output corresponding to the required humidity measurement. The transmitter shall be a 2-wire, loop-powered device. The output error shall not exceed 0.1 percent of calibrated measurement. The transmitter shall include offset and span adjustments.

D. Pressure Instruments: The instrument shall be a pressure transmitter with an integral sensing element.

The instrument over pressure rating shall be 25 psig. The sensing elements accuracy shall be plus or minus 2 percent of full scale. Transmitter accuracy shall be plus or minus 0.25 percent of the calibrated measurement. The transmitter shall be a 2-wire, loop-powered device. The transmitter shall produce a linear 4-to-20 mAdc output corresponding to the required pressure measurement. Each transmitter shall have offset and span adjustments.

E. Thermowells: Thermowells shall be Series 300 stainless steel with threaded brass plug and chain, 2-inch lagging neck and extension-type well, and inside diameter and insertion length as required for the application.

F. Sunshields: Sunshields for outside-air temperature sensing elements shall prevent the sun from directly striking the temperature sensing elements. The sunshields shall be provided with adequate ventilation so that the sensing element responds to the ambient temperature of the surroundings. The top of each sunshield shall have a galvanized-metal rainshield projecting over the face of the sunshield. The sunshields shall be painted white or shall be unpainted aluminum.

2.08 THERMOSTATS

A. Ranges: Thermostat ranges shall be selected so that the setpoint is adjustable without tools between plus or minus 10 degrees F of the setpoint shown.

B. Space Low Limit Thermostats: Contacts shall be single-pole double-throw (SPDT), hermetically sealed, and wired to identified terminals. Maximum differential shall be 2 degrees F unless otherwise specified.

Thermostat covers shall be made of locking metal or heavy-duty plastic, and shall be capable of being locked by an allen-head wrench or a special tool. Thermostats shall have manual switches as required by the application.

15975-9

C. Low-Temperature-Protection Thermostats: Low-temperature-protection thermostats shall be manual reset, low-temperature safety thermostats, with NO and NC contacts and a 20-foot element which shall respond to the coldest 18-inch segment.

D. Standard Unit Heater and Exhaust Fan Thermostats: Thermostat contacts shall be SPDT and wired to identified terminals. Thermostat housing shall be a NEMA 4X waterproof enclosure which will tolerate continuous spraying with water, high humidity, and airborne contaminants. Temperature scale and adjusting knob shall be mounted on the face of the thermostat such that setpoint adjustment can be made without tools. Adjusting knob penetration shall be sealed with a lubricated 0-ring or other positive sealing method to maintain the integrity of the enclosure. Temperature range of thermostats shall be 40 to 100 degrees F. Temperature differential shall be not greater than 3 degrees F. Contact rating shall be sufficient to switch the connected load.

2.09 PRESSURE SWITCHES AND SOLENOID VALVES

A. Pressure Switches: Each switch shall have an adjustable setpoint with visible setpoint scale. Range shall be as shown. Differential adjustment shall span 20 to 40 percent of the range of the device.

B. Differential-Pressure Switches: Each switch shall be an adjustable diaphragm-operated device with 2

SPDT contacts, with taps for sensing lines to be connected to duct pressure fittings designed to sense air pressure. These fittings shall be of the angled-tip type with tips pointing into the air stream. Range shall be 0.5 to 6.0 inches water gauge. Differential shall be a maximum of 0.15 inch water gauge at the low end of the range and 0.35 inch water gauge at the high end of the range.

2.10 INDICATING DEVICES

A. Thermometers

1. Ductwork Insertion and Piping Systems: Thermometers for insertion in ductwork and piping systems shall have brass, malleable iron, or aluminum alloy case and frame, clear protective face, permanently stabilized glass tube with indicating-fluid column, white face, black numbers, and a 9-inch scale.

2. Thermometers for piping systems shall have rigid stems with straight, angular, or inclined pattern, and shall conform to FS GG-T-321.

3. Thermometer Stems: All thermometer stems shall have expansion heads as required to prevent breakage at extreme temperatures. On rigid-stem thermometers, the space between bulb and stem shall be filled with a heat-transfer medium.

4. Air-Duct Thermometers: Air-duct thermometers shall have perforated stem guards and 45-degree adjustable duct flanges with locking mechanism.

5. Averaging Thermometers: Averaging thermometers shall have 3-1/2 inch (nominal) dial, with black legend on white background, and pointer traveling through a 270-degree arc.

6. Accuracy: Thermometers shall have an accuracy of plus or minus 1 percent of scale range.

Thermometers shall have the following ranges:

a. Mixed-air temperature: 0 to 100 degrees F in 1-degree F graduations.

b. Return-air temperature: 0 to 100 degrees F in 1-degree F graduations.

c. Cooling-coil-discharge temperature: 0 to 100 degrees F in 1-degree F graduations.

d. Heating-coil-discharge temperature: 30 to 180 degrees F in 2-degree F graduations.

e. Hydronic-heating systems below 220 degrees F: 40 to 240 degrees F in 2-degree graduations.

B. Pressure Gauges: Gauges shall have black legend on white, background, and shall have a pointer traveling through a 270-degree arc. Accuracy shall be plus or minus 3 percent of scale range. Gauges shall meet ANSI B40.1.

1. Hydronic-System Applications: Gauges for hydronic-system applications shall be 4-1/2 inch (nominal) size and have ranges and graduations as shown below.

a. Pump Suction - 30 psi range, 1 psi graduations, 5 psi figure interval.

b. Pump Discharge - 60 psi range, 2 psi graduations, 10 psi figure interval.

c. Coil Supply - 60 psi range, 2 psi graduations, 10 psi figure interval.

d. Coil Return - 30 psi range, 1 psi graduations, 5 psi figure interval.

e. Chiller Inlet and Outlet - 60 psi range, 2 psi graduations, 10 psi figure interval.

f. Boiler Inlet and Outlet - 60 psi range, 2 psi graduations, 10 psi figure interval.

2. Low Differential Pressure Gauges: Gauges for low differential-pressure measurements shall be 4-1/2

15975-10 inch (nominal) size with two sets of pressure taps, and shall have a diaphragm-actuated pointer, white dial with black figures, and pointer zero adjustment. Gauges shall have ranges and graduations as shown. Accuracy shall be plus or minus 2 percent of scale range.

2.11 CONTROL DEVICES AND ACCESSORIES

A. Relays: Relays shall be 2-pole, double-throw (2PDT) with a 10-ampere resistive rating at 120 Vac, and shall have an enclosed 120-Vac coil with 11-pin blade connectors, and a matching rail-mounted socket.

Power consumption shall not be greater than 3 watts.

B. Time-Delay Relays: Time delay relays shall be 2PDT with 8-pin connectors, dust cover, and a matching rail-mounted socket. Adjustable timing range shall be 0 to 5 minutes. Power consumption shall not be greater than 3 watts.

C. Regulated Power Supplies: Each power supply shall provide a 24-Vdc linear supply at not less than 2 amperes, with regulation to 0.05 percent of output voltage. Each power supply shall have a fused input, and shall be protected from voltage surges and power-line transients. The power supply output shall be protected against overvoltage and short circuits. Power supply loading shall not be greater than 1.2 amperes.

2.12 PILOT LIGHTS AND MANUAL SWITCHES

A. Pilot Lights, Illuminated Switches, and Non-illuminated Switches: Pilot lights, illuminated switches, and non-illuminated switches shall be rectangular devices arranged in a horizontal matrix as shown. Switch action shall be as shown. Device illumination shall be by light-emitting diode lamp or by neon lamp.

B. Manual Timed Override Switches: Manual timed override switches shall be spring-wound mechanical type, with timer range as specified on the drawings. Switches shall be furnished with a faceplate with time intervals permanently etched or engraved in the faceplate at the time of manufacture. Timer knob shall have a pointer to indicate setting position. Switches shall be suitable for mounting in a standard 2" x 4" outlet box. Contacts shall be rated for 20 amp resistive load at 125 volts. Switches shall be UL listed.

2.13 HVAC SYSTEM CONTROL PANELS

A. Panel Assembly: The panel shall be fabricated as shown, and the devices shall be mounted as shown.

Each panel shall be fabricated as a bottom-entry connection point for control-system electric power, control-system main air source, control-system wiring, pneumatic tubing, interconnection of control systems, interconnection of starters and external shutdown devices, and energy monitoring and control systems (EMCS) interface. Each panel shall have an operating temperature rise of not greater than 20 degrees F above an ambient temperature of 100 degrees F.

B. Panel Electrical Requirements: Each control panel shall be powered by nominal 120 volts ac terminating at the panel on terminal blocks. Instrument cases shall be grounded. Interior panel, interior door, and exterior panel enclosure shall be grounded.

C. Enclosure: The enclosure for each panel shall be a NEMA 12 single-door wall-mounted box conforming to NEMA 250, with continuous hinged and gasketed exterior door with print pocket and key lock, continuous hinged interior door, interior back panel, and ventilation louvers in back surface as shown.

Inside finish shall be white enamel, and outside finish shall be gray primer over phosphatized surfaces.

D. Mounting and Labeling: Controllers, pilot lights and switches, shall be mounted on the interior door as shown. Power conditioner, fuses and duplex outlet shall be mounted on the interior of the cabinet as shown. All other components housed in the panel shall be mounted on the interior back panel surface of the enclosure, behind the door on rails as shown. Controllers and gauges shall be identified by a plastic or metal nameplate that is mechanically attached to the panel. The nameplate shall have the inscription as shown. Lettering shall be cut or stamped into the nameplate to a depth of not less than 1/64 inch, and shall show a contrasting color, produced by filling with enamel or lacquer or by the use of a laminated material. Painting of lettering directly on the surface of the interior door or panel is not permitted.

E. Wiring and Tubing

1. Wiring Interconnections: Wiring shall be installed in wiring ducts in such a way that devices can be added or replaced without disturbing wiring that is not affected by the change. Wiring to single-loop

15975-11 controllers shall have a 4-inch wiring loop in the horizontal wiring duct at each wiring connection.

There shall be no wiring splices within the control panel. All interconnections required for power or signals shall be made on device terminals or panel terminal blocks, with not more than 2 wires connected to a terminal.

2. Terminal Blocks: Terminal blocks shall be arranged in groups as shown. Instrument signal grounds at the same ground reference level shall end at a grounding terminal for connection to a common ground point. Wiring-shield grounds at the same reference level shall end at a grounding terminal for connection to a common ground point. Grounding terminal blocks shall be identified by reference level.

3. Wiring Identification: All wiring connected to controller shall be identified by function and polarity, i.e., process variable, input, remote setpoint input and output.

F. EMCS Terminal Blocks: Terminal blocks shall be provided for connections to EMCS as shown. Analog signals shall require only the removal of jumpers to interface to EMCS.

2.14 ELECTRONIC VARIABLE AIR VOLUME (VAV) TERMINAL UNIT CONTROLS

A. VAV Terminal Units:

B. Terminal-Unit Controls

1. Vav Box Controller: Controls for pressure-independent boxes shall consist of a velocity- sensing device in the primary air entering the box, a room temperature sensing element, a damper actuator, a duct temperature sensor, and an adjustable microprocessor-based VAV box controller. Each controller shall operate a damper for cooling and, if required, a duct coil valve for heating. Actuators shall open and close the device to which it is applied within 6 minutes. The controller shall be compatible with the existing Barber-Colman Network 8000 EMCS system. The controller shall be capable of reading cfm, duct temperature, room temperature, cooling setpoint, and damper position.

Terminal unit controls shall have the requirements of UL 916 and FCC Part 15.

2. Communication-and-Programming Device: One hand-held communication-and-programming device with instruction manuals shall be provided. The communication-and-programming device shall connect to the VAV box controller directly or to a jack at the room temperature sensing element location. The communication-and-programming device shall be used to read and set minimum velocity, maximum velocity, cooling setpoint, and space temperature.

PART 3 EXECUTION

3.01 GENERAL INSTALLATION CRITERIA: The HVAC control system shall be completely installed and ready for operation, as specified and shown. Dielectric isolation shall be provided where dissimilar metals are used for connection and support. Penetrations through and mounting holes in the building exterior shall be made watertight. The HVAC control-system installation shall provide clearance for control-system maintenance by maintaining access space between coils, access space to mixed-air plenums, and other access space required to calibrate, remove, repair, or replace control-system devices. The control-system installation shall not interfere with the clearance requirements for mechanical and electrical system maintenance.

A. Device-Mounting Criteria: Devices mounted in or on piping or ductwork, on building surfaces, in mechanical/electrical spaces, or in occupied space ceilings shall be installed in accordance with manufacturers' recommendations and as shown. Control devices to be installed in piping and ductwork shall be provided with all required gaskets, flanges, thermal compounds, insulation, piping, fittings, and manual valves for shutoff, equalization, purging, and calibration. Strap-on temperature sensing elements shall not be used except as specified.

B. Wiring Criteria: Wiring external to control panels, including low-voltage wiring, shall be installed in metallic raceways. Wiring shall be installed without splices between control devices and HVAC control panels. Instrumentation grounding shall be installed as necessary to prevent ground loops, noise, and surges from adversely affecting operation of the system. Cables and conductors wires shall be tagged at both ends, with the identifier shown on the shop drawings, in accordance with the requirements shown in the electrical division of this specification. Other electrical work shall be as specified in applicable sections of the electrical division of this specification

15975-12

C. Controller Output Loop Impedance Limitation: Controller output loops shall be constructed so that total circuit impedance connected to the analog output of a single-loop controller shall not exceed 600 ohms.

3.02 CONTROL-SYSTEM INSTALLATION

A. Damper Actuators

1. Actuators shall not be mounted in the air stream.

2. Multiple actuators operating a common damper shall be connected to a common drive shaft.

3. Actuators shall be installed so that their action shall seal the damper to the extent required to maintain leakage at or below the specified rate and shall move the blades smoothly.

B. Room-Instrument Mounting: Room instruments shall be mounted so that their sensing elements are 5 feet above the finished floor unless otherwise shown.

C. Low-Temperature-Protection Thermostats: For each 20 square feet of coil-face area, or fraction thereof, a thermostat shall be provided to sense the temperature at the location shown. The thermostat sensing element shall be installed in a serpentine pattern.

D. Averaging-Temperature Sensing Elements: Sensing elements shall have a total-element minimum length equal to one linear foot per square foot of duct cross-sectional area.

E. Duct Static-Pressure Sensing Elements and Transmitters: The duct static-pressure sensing element and transmitter sensing point shall be located approximately two-thirds of the distance from the supply fan to the end of the duct with the greatest pressure drop.

F. Indication Devices Installed in Piping and Liquid Systems: Gauges in piping systems subject to pulsation shall have snubbers. Thermometers and temperature sensing elements installed in liquid systems shall be installed in thermowells.

G. Tubing

1. Control System Installation: The control system shall be installed so that pneumatic lines are not exposed to outside-air temperatures. All tubes and tube bundles exposed to view shall be installed neatly in lines parallel to the lines of the building. Tubing in mechanical/electrical spaces shall be routed so that the lines are easily traceable.

2. Pneumatic Lines: In mechanical/electrical spaces, pneumatic lines shall be plastic tubing or copper tubing. Horizontal and vertical runs of plastic tubes or soft copper tubes shall be installed in raceways dedicated to tubing. The dedicated raceways shall be supported every 6 feet for horizontal runs and every 8 feet for vertical runs. Tubing not installed in raceways shall be hard-drawn copper tubing with sweat fittings and valves, supported every 6 feet for horizontal runs and every 8 feet for vertical runs.

3. Connection to Liquid Lines: Tubing for connection of sensing elements and transmitters to liquid lines shall be copper with brass compression fittings.

4. Connection to Ductwork: Tubing for connection of sensing elements and transmitters to ductwork shall be plastic tubing.

5. External Tubing: Tubing external to mechanical/electrical spaces, when run in plenum ceilings, shall be soft copper with sweat fittings, supported every 8 feet.