bafbrwhq15900.pdf

SECTION 15900 REPAIR WING HEADQUARTERS, BLDG 706

HVAC INSTRUMENTATION AND CONTROL CRWU 06-2071

06/09/09 15900-1 BUCKLEY AFB

SECTION 15900 - HVAC INSTRUMENTATION AND CONTROL

PART 1 - GENERAL

1.01 SUMMARY:

A. This Section includes control equipment for HVAC systems and components, including control components for terminal heating and cooling units not supplied with factory-wired controls.

B. Related Work Specified Elsewhere:

1. Electrical metallic tubing materials and installation: SECTION 16110 - RACEWAYS.

2. Electronic and fiber optical cable for control wiring: SECTION 16120 - WIRES AND

CABLES.

3. Smoke detectors mounted in HVAC systems and equipment: SECTION 16721 - FIRE

ALARM SYSTEMS.

1.02 REFERENCES:

A. Applicable Standards:

1. Air Movement and Control Association (AMCA):

a. 500D - Test Methods for Louvers, Dampers and Shutters.

2. American Society for Testing and Materials (ASTM):

a. A126 - Gray Iron Castings for Valves, Flanges, and Pipe Fittings.

b. A536 - Ductile Iron Casting.

c. B32 - Solder Metal.

d. B88/B88M - Seamless Copper Water Tube.

e. B280 - Seamless Copper Tube for Air Conditioning and Refrigeration Field Service.

f. D2737 - Polyethylene (PE) Plastic Tubing.

3. American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE):

a. 15 - Safety Code for Mechanical Refrigeration.

b. 135 - BACnet-A Data Communication Protocol for Building Automation and

Control Networks.

4. American Society of Mechanical Engineers (ASME):

a. B16.18 - Cast Copper Alloy Solder Joint Pressure Fittings.

b. B16.22 - Wrought Copper and Copper Alloy Solder Joint Pressure Fittings.

5. Electronic Industries Association (EIA):

a. 485 - Electrical Characteristics of Generators and Receivers for Use in Balanced

Digital Multipoint Systems.

6. Institute of Electrical and Electronics Engineers (IEEE):

a. DC3 - Residential Controls-Electrical Wall-Mounted Room Thermostats.

7. National Electrical Manufacturers Association (NEMA)

a. DC3 - Residential controls - Electrical Wall-Mounted Room Thermostats.

8. National Fire Protection Association (NFPA):

a. 70 - National Electrical Code.

b. 90A - Installation of Air Conditioning and Ventilation Systems.

9. Underwriters Laboratories Inc. (UL):

a. 486A - Wire Connectors and Soldering Lugs for Use with Copper Conductors.

b. 486B - Wire Connectors for Use with Aluminum Conductors.

1.03 DEFINITIONS:

A. DDC: DIRECT-DIGITAL CONTROLS.

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B. LAN: Local area network.

C. MS/TP: Master-slave/token-passing.

D. PICS: Protocol Implementation Conformance Statement.

1.04 SYSTEM DESCRIPTION:

A. Control system consists of sensors, indicators, actuators, final control elements, interface equipment, other apparatus, accessories, and software connected to distributed controllers operating in multiuser, multitasking environment on token-passing network and programmed to control mechanical systems.

B. Control system includes the following:

1. Fire alarm system specified in SECTION 16721 - FIRE ALARM SYSTEMS.

1.05 SUBMITTALS:

A. General: Submit the following as specified in SECTION 15050 - BASIC MECHANICAL

MATERIALS AND METHODS.

B. Product Data: Include manufacturer's technical literature for each control device. Indicate dimensions, capacities, performance characteristics, electrical characteristics, finishes for materials, and installation and startup instructions for each type of product indicated.

1. Each control device labeled with setting or adjustable range of control.

C. Field Test Reports: Indicate and interpret test results for compliance with performance requirements.

D. Qualification Data: For firms and persons specified in "Quality Assurance" Article.

E. Project Record Documents: Record actual locations of control components, including control units, thermostats, and sensors. Revise Shop Drawings to reflect actual installation and operating sequences.

1.06 QUALITY ASSURANCE:

A. Installer Qualifications: An experienced installer who is an authorized representative of the automatic control system manufacturer for both installation and maintenance of units required for this Project.

B. Manufacturer Qualifications: A firm experienced in manufacturing automatic temperature-control systems similar to those indicated for this Project and with a record of successful in-service performance.

C. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use.

D. Comply with NFPA 90A, "Installation of Air Conditioning and Ventilation Systems."

E. Electronic Equipment Compliance:

1. Contractor warrants that all equipment, devices, items, systems, software, hardware, or firmware provided shall properly, appropriately, and consistently function and accurately process date and time date (including without limitation: calculating, comparing, and sequencing). This warranty supersedes anything in the Specifications or other Contract Documents which might be construed inconsistently. This warranty is applicable whether the equipment, device, item, system, software, hardware, or firmware is specified with or without reference to a manufacturer's name, make, or model number.

1.07 DELIVERY, STORAGE, AND HANDLING:

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

1.08 COORDINATION:

A. Coordinate location of thermostats and other exposed control sensors with plans and room details before installation.

B. Coordinate equipment with SECTION 16721 - FIRE ALARM SYSTEMS to achieve compatibility with equipment that interfaces with that system.

C. Coordinate supply of conditioned electrical circuits for control units and operator workstation.

D. Coordinate equipment with DIVISION 16 to achieve compatibility with motor starters and annunciation devices.

E. Coordinate size and location of concrete bases. Cast anchor-bolt inserts into bases. Concrete, reinforcement, and formwork requirements are specified in DIVISION 3.

1.09 EXTRA MATERIALS:

A. Furnish extra materials described below that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.

B. Replacement Materials: One replacement diaphragm or relay mechanism for each unique controller and thermostat.

C. Maintenance Materials: One thermostat adjusting key.

PART 2 - PRODUCTS

2.01 MANUFACTURERS:

A. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

1. Control Systems Components:

a. Delta Controls Inc.

2. Electric, Electronic, and DDC Systems:

a. Delta Controls Inc.

2.02 CONTROL PANELS:

A. Local Control Panels: Unitized cabinet with suitable brackets for wall or floor mounting, located adjacent to each system under automatic control. Provide common keying for all panels.

1. Fabricate panels of 0.06-inch- (1.5-mm-) thick, furniture-quality steel, or extruded-aluminum alloy, totally enclosed, with hinged doors and keyed lock and with manufacturer's standard shop-painted finish.

2. Panel-Mounted Equipment: Temperature and humidity controllers, relays, and automatic switches; except safety devices. Mount devices with adjustments accessible through front of panel.

3. Door-Mounted Equipment: Flush-mount (on hinged door) manual switches, including damper-positioning switches, changeover switches, thermometers, and gages.

4. Graphics: Color-coded graphic, laminated-plastic displays on doors, schematically showing system being controlled, with protective, clear plastic sheet bonded to entire door.

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2.03 SENSORS:

A. Electronic Sensors: Vibration and corrosion resistant; for wall, immersion, or duct mounting as required.

1. Thermistor temperature sensors as follows:

a. Accuracy: Plus or minus 0.5oF (0.3oC) at calibration point.

b. Wire: Twisted, shielded-pair cable.

c. Averaging Elements in Ducts: 36 inches (91 cm) long, flexible; use where prone to temperature stratification or where ducts are larger than 9 sq. ft. (1 sq. m); length as required.

d. Insertion Elements for Liquids: Brass socket with minimum insertion length of 2- 1/2 inches (64 mm).

e. Room Sensors: Match room thermostats, locking cover.

f. Outside-Air Sensors: Watertight inlet fitting, shielded from direct sunlight.

2. Static-Pressure Transmitter: Nondirectional sensor with suitable range for expected input, and temperature compensated.

a. Accuracy: 2% of full scale with repeatability of 0.5%.

b. Output: 4 to 20 mA.

c. Duct Static-Pressure Range: 0 to 5 inches wg (0 to 1243 Pa).

3. Pressure Transmitters: Direct acting for gas, liquid, or steam service; range suitable for system; proportional output 4 to 20 mA.

B. Equipment operation sensors as follows:

1. Status Inputs for Fans: Differential-pressure switch with adjustable range of 0 to 5 inches wg (0 to 1243 Pa).

2. Status Inputs for Electric Motors: Current-sensing relay with current transformers, adjustable and set to 175% of rated motor current.

C. Electronic Valve/Damper Position Indication: Visual scale indicating percent of travel and 2-to 10Vdc, feedback signal.

D. Water-Flow Switches: Pressure-flow switches of bellows-actuated mercury or snap-acting type, with appropriate scale range and differential adjustment, with stainless-steel or bronze paddle. For chilled-water applications, provide vaporproof type.

2.04 THERMOSTATS:

A. Electric solid-state, microcomputer-based room thermostat with remote sensor.

1. Automatic switching from heating to cooling.

2. Preferential rate control to minimize overshoot and deviation from set point.

3. Set up for four separate temperatures per day.

4. Instant override of set point for continuous or timed period from 1 hour to 31 days.

5. Short-cycle protection.

6. Programming based on weekdays, Saturdays and Sundays.

7. Selection features include oF or oC display, 12- or 24-hour clock, keyboard disable, remote sensor, fan on-auto.

8. Battery replacement without program loss.

9. Thermostat display features include the following:

a. Time of day.

b. Actual room temperature.

c. Programmed temperature.

d. Programmed time.

e. Duration of timed override.

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f. Day of week.

g. System mode indications include "heating," "off," "fan auto," and "fan on."

B. Remote-Bulb Thermostats: On-off or modulating type, liquid filled to compensate for changes in ambient temperature, with copper capillary and bulb, unless otherwise indicated.

1. Bulbs in water lines with separate wells of same material as bulb.

2. Bulbs in air ducts with flanges and shields.

3. Averaging Elements: Copper tubing with either single- or multiple-unit elements, extended to cover full width of duct or unit, adequately supported.

4. Scale settings and differential settings are clearly visible and adjustable from front of instrument.

5. On-Off Thermostat: With precision snap switches, with electrical ratings required by application.

6. Modulating Thermostats: Construct so complete potentiometer coil and wiper assembly is removable for inspection or replacement without disturbing calibration of instrument.

C. Airstream Thermostats: Two-pipe, fully proportional, single-temperature type, with adjustable set point in middle of range and adjustable throttling range, plug-in test fitting or permanent pressure gage, remote bulb, bimetal rod and tube, or averaging element.

D. Electric Low-Limit Duct Thermostat: Snap-acting, single-pole, single-throw, manual- or automatic-reset switch that trips if temperature sensed across any 12 inches (300 mm) of bulb length is equal to or below set point.

1. Bulb Length: Minimum 20 feet (6 m).

2. Quantity: One thermostat for every 20 sq. ft. (2 sq. m) of coil surface.

E. Electric High-Limit Duct Thermostat: Snap-acting, single-pole, single-throw, manual- or automatic-reset switch that trips if temperature sensed across any 12 inches (300 mm) of bulb length is equal to or above set point.

1. Bulb Length: Minimum 20 feet (6 m).

2. Quantity: One thermostat for every 20 sq. ft. (2 sq. m) of coil surface.

F. Heating Valve-Top Thermostats: Proportional acting for proportional flow, molded-rubber diaphragm, remote-bulb liquid-filled element, direct and reverse acting at minimum shutoff pressure of 25 psig (172 kPa), and cast housing with position indicator and adjusting knob.

2.05 ACTUATORS:

A. Electric Motors: Size to operate with sufficient reserve power to provide smooth modulating action or two-position action.

1. Comply with requirements in SECTION 15055 - MOTORS.

2. Permanent Split-Capacitor or Shaded-Pole Type: Gear trains completely oil immersed and sealed. Equip spring-return motors with integral spiral-spring mechanism in housings designed for easy removal for service or adjustment of limit switches, auxiliary switches, or feedback potentiometer.

3. Spring-Return Motors for Valves Larger Than NPS 2-1/2 (DN 65): Size for running and breakaway torque of 150 in. x lbf (16.9 N x m).

4. Spring-Return Motors for Dampers Larger Than 25 Sq. Ft. (2.3 sq. m): Size for running and breakaway torque of 150 in. x lbf (16.9 N x m).

B. Electronic Damper and Large-Valve Actuators: Direct-coupled type designed for minimum 60,000 full-stroke cycles at rated torque.

1. Valves: Size for torque required for valve close-off at maximum pump differential pressure.

2. Dampers: Size for running torque calculated as follows:

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a. Parallel-Blade Damper with Edge Seals: 7 inch-pounds/sq. ft. (86.8 kg-cm/sq. m) of damper.

b. Opposed-Blade Damper with Edge Seals: 5 inch-pounds/sq. ft. (62 kg-cm/sq. m) of damper.

c. Parallel-Blade Damper without Edge Seals: 4 inch-pounds/sq. ft (49.6 kg-cm/sq. m) of damper.

d. Opposed-Blade Damper without Edge Seals: 3 inch-pounds/sq. ft. (37.2 kg-cm/sq.

m) of damper.

e. Dampers with 2 to 3 Inches wg (500 to 750 Pa) of Pressure Drop or Face Velocities of 1000 to 2500 FPM (5 to 13 m/s): Multiply the minimum full-stroke cycles above by 1.5.

f. Dampers with 3 to 4 Inches wg (750 to 1000 Pa) of Pressure Drop or Face Velocities of 2500 to 3000 FPM (13 to 15 m/s): Multiply the minimum full-stroke cycles above by 2.0.

3. Coupling: V-bolt and V-shaped, toothed cradle.

4. Overload Protection: Electronic overload or digital rotation-sensing circuitry.

5. Fail-Safe Operation: Mechanical, spring-return mechanism. Provide external, manual gear release on non-spring-return actuators.

6. Power Requirements (Two-Position Spring Return): 120Vac.

7. Power Requirements (Modulating): Maximum 10 VA at 24Vac or 8 W at 24Vdc.

8. Proportional Signal: 2- to 10Vdc or 4 to 20 mA, and 2- to 10Vdc position feedback signal.

9. Temperature Rating: 40 to 104oF (4 to 40oC).

10. Run Time: 30 seconds.

2.06 CONTROL VALVES:

A. Control Valves: Factory fabricated, of type, body material, and pressure class based on maximum pressure and temperature rating of piping system, unless otherwise indicated.

B. Globe Valves NPS 2 (DN 50) and Smaller: Bronze body, bronze trim, rising stem, renewable composition disc, and screwed ends with backseating capacity repackable under pressure.

C. Terminal Unit Control Valves: Bronze body, bronze trim, two- or three-port as indicated, replaceable plugs and seats, union and threaded ends.

1. Rating: Class 125 for service at 125 psig (862 kPa) and 250oF (121oC) operating conditions.

2. Sizing: 3-psig (21-kPa) maximum pressure drop at design flow rate, to close against pump shutoff head.

3. Flow Characteristics: Two-way valves shall have equal percentage characteristics.

2.07 CONTROL CABLE:

A. Electronic and Fiber-Optic Cable for Control Wiring: As specified in SECTION 16120 -

WIRES AND CABLES.

PART 3 - EXECUTION

3.01 EXAMINATION:

A. Verify that conditioned power supply is available to control units and operator workstation.

B. Verify that duct-, pipe-, and equipment-mounted devices and wiring are installed before proceeding with installation.

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3.02 INSTALLATION:

A. Install equipment level and plumb.

B. Connect and configure equipment and software to achieve sequence of operation specified.

C. Verify location of temperature sensors and other exposed control sensors with plans and room details before installation. Locate all 60 inches (1524 mm) above the floor.

1. Install averaging elements in ducts and plenums in crossing or zigzag pattern.

D. Install automatic dampers according to SECTION 15820 - DUCT ACCESSORIES.

E. Install damper motors on outside of duct in warm areas, not in locations exposed to outdoor temperatures.

F. Install labels and nameplates to identify control components according to SECTION 15075 –

MECHANICAL IDENTIFICATION.

G. Install hydronic instrument wells, valves, and other accessories according to SECTION

15181 - HYDRONIC PIPING.

H. Install duct volume-control dampers according to DIVISION 15 Sections specifying air ducts.

3.03 ELECTRICAL WIRING AND CONNECTION INSTALLATION:

A. Install raceways, boxes, and cabinets according to SECTION 16110 - RACEWAYS.

B. Install building wire and cable according to SECTION 16120 -WIRES AND CABLES.

C. Install signal and communication cable according to SECTION 16120 -WIRES AND

CABLES.

1. Conceal raceways, except in mechanical rooms and areas where other conduit and piping are exposed.

2. Install cable in raceway.

3. Bundle and harness multiconductor instrument cable in place of single cables where several cables follow a common path.

4. Fasten flexible conductors, bridging cabinets and doors, along hinge side; protect against abrasion. Tie and support conductors.

5. Number-code or color-code conductors for future identification and service of control system, except local individual room control cables.

6. Connect manual-reset limit controls independent of manual-control switch positions.

Automatic duct heater resets may be connected in interlock circuit of power controllers.

D. Connect hand-off-auto selector switches to override automatic interlock controls (but not safety interlocks) when switch is in hand position.

3.04 CONNECTIONS:

A. Piping installation requirements are specified in other DIVISION 15 Sections. Drawings indicate general arrangement of piping, fittings, and specialties.

1. Install piping adjacent to machine to allow service and maintenance.

B. Ground equipment.

1. Tighten electrical connectors and terminals according to manufacturer's published torque-tightening values. If manufacturer's torque values are not indicated, use those specified in UL 486A.

3.05 FIELD QUALITY CONTROL:

A. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect field-assembled components and equipment installation, including piping and electrical connections. Report results in writing.

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1. Leak Test: After installation, charge system and test for leaks. Repair leaks and retest until no leaks exist.

2. Operational Test: After electrical circuitry has been energized, start units to confirm proper unit operation. Remove malfunctioning units, replace with new units, and retest.

3. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment, and retest.

B. Engage a factory-authorized service representative to perform startup service.

C. Replace damaged or malfunctioning controls and equipment.

1. Start, test, and adjust control systems.

2. Demonstrate compliance with requirements, including calibration and testing, and control sequences.

3. Adjust, calibrate, and fine tune circuits and equipment to achieve sequence of operation specified.

D. Verify DDC as follows:

1. Verify software including automatic restart, control sequences, scheduling, reset controls, and occupied/unoccupied cycles.

2. Verify local control units including self-diagnostics.

3.06 DEMONSTRATION:

A. Engage a factory-authorized service representative to train Owner's maintenance personnel to adjust, operate, and maintain control systems and components.

1. Train Owner's maintenance personnel on procedures and schedules for starting and stopping, troubleshooting, servicing, and maintaining equipment and schedules.

2. Provide operator training on data display, alarm and status descriptors, requesting data, executing commands, calibrating and adjusting devices, resetting default values, and requesting logs. Include a minimum of 40 hours' dedicated instructor time on-site.

3. Review data in maintenance manuals. Refer to SECTION 15050.

4. Schedule training with Owner, through Engineer, with at least seven days' advance notice.

3.07 ON-SITE ASSISTANCE:

A. Occupancy Adjustments: Within one year of date of Substantial Completion, provide up to three 8-hour Project site visits, when requested by Owner, to adjust and calibrate components and to assist Owner's personnel in making program changes and in adjusting sensors and controls to suit actual conditions.

END OF SECTION 15900