Add #1 Main Campus CEP CT#2

College of Coastal Georgia CCGA-2311 Camden Center Chiller CHR-1 Replacement

NBP #22129

ADDENDUM NO. 1

A1 - 1

This Addendum forms part of the Contract Documents and modifies the original bidding documents dated November 14, 2022. Acknowledge receipt of this Addendum in the space provided on the Bid Form. Failure to do may subject the bidder to disqualification.

The contract documents are herein amended under the date of December 2, 2022 as follows:

AMENDMENTS TO THE SPECIFICATIONS

1. SECTION 01 4000 – QUALITY REQUIREMENTS

A. 1.04.L.: Add the following paragraphs to the Documents:

L. The following Contractors submitted Qualifications meeting the Specified Requirements and are approved to bid:

1. Air Management Systems

2. Comfort Systems

3. JM Clayton

4. Copper Construction Company

2. Add attached SECTION 23 0514 - VARIABLE FREQUENCY CONTROLLERS.

3. Replace SECTION 23 0913 - INSTRUMENTATION AND CONTROL DEVICES FOR

HVAC with updated attached.

AMENDMENTS TO THE DRAWINGS

1. Replace SHEET M303 with attached.

END OF ADDENDUM

College of Coastal Georgia November 14, 2022 December 2, 2022 CCGA-2311 Camden Center Chiller CHR-1 Replacement Bid Set

NBP22129

VARIABLE FREQUENCY CONTROLLERS 23 0514 - 1

SECTION 23 0514 - VARIABLE FREQUENCY CONTROLLERS

PART 1 GENERAL

1.01 SECTION INCLUDES

A. Variable frequency controllers

1.02 RELATED SECTIONS

A. Section 23 0513 - Motors for HVAC Equipment.

B. Section 23 0514 - Identification HVAC Piping and Equipment.

C. Section 23 0994 - HVAC Sequence of Operation.

D. Section 26 2717 - Equipment Wiring: Electrical characteristics and wiring connections.

1.03 REFERENCES

A. NEMA ICS 7.1 - Safety Standards for Construction and Guide for Selection, Installation and Operation of Adjustable-Speed Drive Systems; 2006.

B. NEMA ICS 7 - Industrial Control and Systems: Adjustable Speed Drives; National Electrical Manufacturers Association, 2006.

C. NEMA 250 - Enclosures for Electrical Equipment (1000 Volts Maximum), National Electrical Manufacturers Association, 2008.

D. IEEE 519 - IEEE Recommended Practices and Requirements for Harmonic Control in Electric Power Systems; Institute of Electrical and Electronic Engineers; 1992 (R2004).

E. NFPA 70 - National Electrical Code 2020 Edition.

1.04 SUBMITTALS

A. Refer to Section 23 0510 - General Mechanical Requirements, for submittal procedures.

B. Product Data: Provide catalog sheets showing voltage, controller size, ratings and size of switching and overcurrent protective devices, short circuit ratings, dimensions, and enclosure details.

C. Provide programming manual for drive. Manual shall be tabbed for items indicated in item H above.

D. Shop Drawings: Indicate front and side views of enclosures with overall dimensions and weights shown; conduit entrance locations and requirements; and nameplate legends.

E. Rating: Submittal shall specifically indicate that drive size submitted is rated for horsepower being served with drive at 40 degrees C (104 degrees F) and minimum of 4,000 hz switching frequency. Drives rated at lower frequencies are not acceptable.

F. Test Reports: Indicate field test and inspection procedures and test results.

G. Manufacturer's Instructions: Indicate application conditions and limitations of use stipulated by testing agency. Include instructions for storage, handling, protection, examination, preparation, and installation of product.

H. Manufacturer's Field Reports: Indicate start-up inspection findings.

I. Operation Data: NEMA ICS 7.1. Include instructions for starting and operating controllers, and describe operating limits that may result in hazardous or unsafe conditions.

J. Maintenance Data: NEMA ICS 7.1. Include routine preventive maintenance schedule.

K. Warranty: Submit manufacturer's warranty and ensure forms have been filled out in Owner's name and registered with manufacturer.

L. Certificate: Provide Manufacturer's Certificate complying with the requirements of the General Conditions.

1.05 QUALITY ASSURANCE

A. Conform to requirements of NFPA 70.

VARIABLE FREQUENCY CONTROLLERS 23 0514 - 2

B. Products: Listed and classified by Underwriters Laboratories, Inc. as suitable for the purpose specified and indicated.

1.06 DELIVERY, STORAGE, AND HANDLING

A. Store in a clean, dry space. Maintain factory wrapping or provide an additional heavy canvas or heavy plastic cover to protect units from dirt, water, construction debris, and traffic.

B. Handle in accordance with manufacturer's written instructions. Lift only with lugs provided for the purpose. Handle carefully to avoid damage to components, enclosure, and finish.

1.07 WARRANTY

A. Provide a three year warranty to include materials only.

PART 2 PRODUCTS

2.01 MANUFACTURERS

A. ABB ACH580, AC Technology QC3000, Allen Bradley Powerflex, Danfoss VLT HVAC, Eaton DH-1 HVAC, Emerson EVC, Hitachi SJ700D, Yaskawa Z1000, Omron VT5 Series, Schneider Electric Altivar ATV, Toshiba E3 Series, Johnson Controls, Inc. Series II.

2.02 DESCRIPTION

A. Variable Frequency Controllers: Enclosed controllers suitable for operating the indicated loads, in conformance with requirements of NEMA ICS 7. Select unspecified features and options in accordance with NEMA ICS 3.1.

1. Employ microprocessor-based inverter logic isolated from power circuits.

2. Employ pulse-width-modulated inverter system providing a carrier frequency adjustable from 4,000Hz to 8,000Hz.

3. Design for ability to operate controller with motor disconnected from output.

4. Design to attempt five automatic restarts following fault condition before locking out and requiring manual restart.

B. Enclosures: NEMA 250, Type 1, suitable for equipment application in places restricted to persons employed on the premises.

C. Attic Enclosure: NEMA 250, Type 3R, suitable for equipment application in places restricted to persons employed on the premises. Provide insulated enclosure with vent fan and inlet for ducted connection and view panel.

D. Finish: Manufacturer's standard enamel.

2.03 OPERATING REQUIREMENTS

A. Rated Input Voltage: 480 volts, three phase, 60 Hertz.

B. Motor Nameplate Voltage: 460 volts, three phase, 60 Hertz.

C. Displacement Power Factor: Between 1.0 and 0.95, lagging, over entire range of operating speed and load.

D. Operating Ambient: 0 degrees C to 40 degrees C.

E. Minimum Efficiency at Full Load: 95 percent.

F. Volts Per Hertz Adjustment: Plus or minus 10 percent.

G. Current Limit Adjustment: 60 to 110 percent of rated.

H. Acceleration Rate Adjustment:.5 to 360 seconds.

I. Deceleration Rate Adjustment: 1 to 360 seconds.

J. Input Signal: 4 to 20 mA DC.

2.04 COMPONENTS

A. Display: Provide integral digital display to indicate output voltage, output frequency, and output current.

VARIABLE FREQUENCY CONTROLLERS 23 0514 - 3

B. Status Indicators: Separate indicators for overcurrent, overvoltage, ground fault, overtemperature, and input power ON.

C. Furnish HAND-OFF-AUTOMATIC selector switch and manual speed control. Omit on fans with automatic isolation dampers.

D. Include undervoltage release.

E. Control Power Source: Integral control transformer.

F. Door Interlocks: Furnish mechanical means to prevent opening of equipment with power connected, or to disconnect power if door is opened; include means for defeating interlock by qualified persons.

G. Safety Interlocks: Furnish terminals for remote contact to inhibit starting under both manual and automatic mode.

H. Control Interlocks:

1. Furnish terminals for remote contact to allow starting in automatic mode.

2. Furnish BACNET communication device(s) to interface VFD with the BAS.

3. Provide auxiliary outputs to comply with the sequence of operation specified in Section 23 0994. Furnish programmable analog outputs(two minimum) and programmable digital outputs(three minimum).

I. Emergency Stop: Use dynamic brakes for emergency stop function.

J. Jogging: On drives serving motors of supply, return, or exhaust fans ducted into one single header duct, provide capability to bring motor up to preset, adjustable, low speed, prior to fan isolation damper opening, signal fan isolation damper to open, then continue to ramp motor up to controlled speed.

K. Disconnecting Means: Include integral circuit breaker on the line side of each controller.

L. Wiring Terminations: Match conductor materials and sizes indicated.

PART 3 EXECUTION

3.01 EXAMINATION

A. Verify that surface is suitable for controller installation.

B. Do not install controller until building environment can be maintained within the service conditions required by the manufacturer.

3.02 INSTALLATION

A. Install in accordance with NEMA ICS 7.1 and manufacturer's instructions.

B. Tighten accessible connections and mechanical fasteners after placing controller.

C. Select and install overload heater elements in motor controllers to match installed motor characteristics.

D. Provide engraved plastic nameplates; refer to Section 23 0553 - Mechanical Identification, for product requirements and location.

E. Neatly type label inside each motor controller door identifying motor served, nameplate horsepower, full load amperes, code letter, service factor, and voltage/phase rating. Place in clear plastic holder.

3.03 MANUFACTURER'S FIELD SERVICES

A. Provide services of factory trained representative for minimum of one day(s) to prepare and start the controllers, calibrate the controls and inspect the installation.

B. Provide services of factory trained representative for minimum of one day(s) to instruct Owner on operation and maintenance.

C. Controller manufacturer shall provide no less than 4 hours of on-site technical assistance to the controls contractor to assure a working hand-off of the BACnet points list. Coordinate with start-up services.

VARIABLE FREQUENCY CONTROLLERS 23 0514 - 4

D. Provide start-up certificate in the format prescribed by the General Conditions.

3.04 ADJUSTING

A. Make final adjustments to installed controller to assure proper operation of load system. Obtain performance requirements from installer of driven loads.

3.05 DEMONSTRATION

A. Demonstrate operation of controllers in automatic and manual modes.

END OF SECTION

INSTRUMENTATION AND CONTROL DEVICES FOR HVAC 23 0913 - 1

SECTION 23 0913 - INSTRUMENTATION AND CONTROL DEVICES FOR HVAC

PART 1 GENERAL

1.01 SECTION INCLUDES

A. Control valves.

B. Automatic dampers.

C. Damper operators.

D. Input/Output Sensors.

E. Miscellaneous accessories.

1.02 RELATED REQUIREMENTS

A. Section 23 2113 - HYDRONIC PIPING: Installation of control valves, flow switches, temperature sensor sockets, gauge taps.

B. Section 26 0519 - Low-Voltage Electrical Power and Conductors & Cables.

1.03 REFERENCE STANDARDS

1.04 SUBMITTALS

A. Refer to Section 23 0510- General HVAC Requirements for submittal procedures.

B. Product Data: Provide description and engineering data for each control system component.

Include sizing as requested. Provide data for each system component and software module.

C. Shop Drawings: Indicate complete operating data, system drawings, wiring diagrams, and written detailed operational description of sequences. Submit schedule of valves indicating size, flow, and pressure drop for each valve. For automatic dampers indicate arrangement, velocities, and static pressure drops for each system.

D. Operation and Maintenance Data: Include inspection period, cleaning methods, recommended cleaning materials, and calibration tolerances.

1.05 QUALITY ASSURANCE

A. Installer Qualifications: Company specializing in performing the work of this section with minimum 5 years’ experience employed directly by the digital equipment manufacturer.

B. Products Requiring Electrical Connection: Listed and classified by Underwriters Laboratories Inc., as suitable for the purpose specified and indicated.

PART 2 PRODUCTS

2.01 EQUIPMENT - GENERAL

A. Products Requiring Electrical Connection: Listed and classified by Underwriters Laboratories Inc., as suitable for the purpose specified and indicated.

2.02 CONTROL VALVES

A. Globe Pattern:

1. Up to 2 inches: Bronze body, bronze trim, stainless steel rising stem, renewable composition disc, screwed ends with backseating capacity repackable under pressure.

2. Over 2 inches: Iron body, bronze trim, stainless steel rising stem, plug-type disc, flanged ends, renewable seat and disc.

3. Hydronic Systems:

a. Rate for service pressure of 125 psig at 250 degrees F.

b. Replaceable plugs and seats of stainless steel.

c. Packing: EDPM O-ring.

d. Refer to Valve Coefficients indicated on drawings for size.

e. Two way valves shall have equal percentage characteristics. Size two way valve operators to close valves against pump shut off head.

B. Electric Operators:

INSTRUMENTATION AND CONTROL DEVICES FOR HVAC 23 0913 - 2

1. Manufacturers: Belimo NF or AF Series, Neptune, Siemens.

2. Valves shall spring return(reversible) to normal position as indicated on freeze, fire, or temperature protection.

3. Valves shall spring return to normal position as indicated on freeze, fire, or temperature protection.

4. Select operator for full shut off at maximum pump differential pressure.

5. 24 VAC reversible motor with Class F insulation or better with drive mechanism in enclosure, 10VA maximum.

6. Enclosure: Water-proof aluminum cover and base, NEMA-2, IP 54, coupling direct to valve.

7. Provide all corrosion resistant (non-ferrous) components, fasteners and mounting devices and connections.

8. Unit shall be prewired. Provide a conduit fitting and a three foot long appliance cord.

9. Valve status display: Color coded visual indicator to display valve position through full range of travel.

10. External built-in travel limit switch to reverse direction.

11. Manual override with hex operator.

2.03 CONTROL DAMPERS

A. Manufacturers: Johnson VD-1250, Ruskin CD50, Greenheck VCD-43.

B. Frames: Extruded aluminum, welded or riveted with corner reinforcement, minimum 16 gage.

C. Blades: Extruded aluminum, double thickness airfoil, maximum blade size 8 inches wide, 48 inches long, minimum 16 gage, attached to minimum 1/2 inch shafts with set screws.

D. Blade Seals: Synthetic elastomeric mechanically attached, field replaceable.

E. Jamb Seals: Spring stainless steel.

F. Shaft Bearings: Synthetic sleeve rotating in polished extruded holes in frame..

G. Linkage and linkage Bearings: Blade linkage outside of airstream with synthetic sleeve bearings.

H. Leakage: Class 1; 8.0 CFM/Sq.FT.inch maximum at 4-inch W.G. pressure difference.

I. Pressure Drop: Less than 0.10 inches W.G. based on fully open 48" x 48" damper and an approach velocity of 2000 FPM.

J. Maximum Pressure Differential: 6 inches wg.

K. Temperature Limits: -40 to 200 degrees F.

2.04 DAMPER OPERATORS

A. General: Provide smooth proportional control with sufficient power for air velocities 20 percent greater than maximum design velocity and to provide tight seal against maximum system pressures. Provide spring return for two position control and for fail safe operation.

1. Provide sufficient number of operators to achieve unrestricted movement throughout damper range.

2. Provide one operator for maximum 36 sq ft damper section.

B. Electric Operators:

1. Manufacturers: Belimo AF24, TFB24, or NF24, Neptune, Siemens, Johnson Controls.

2. Spring return, adjustable stroke motor having oil immersed gear train, with auxiliary end switch.

3. 24 VAC reversible motor with Class F insulation or better with drive mechanism in enclosure, 10VA maximum..

INSTRUMENTATION AND CONTROL DEVICES FOR HVAC 23 0913 - 3

4. Feedback Signal: Independent of input signal providing feedback of true position indication.

5. Enclosure: Aluminum cover and base, NEMA-2, IP 54, coupling direct to damper.

6. Provide all corrosion resistant (non-ferrous) components, fasteners and mounting devices and connections.

7. Unit shall be prewired. Provide a conduit fitting and a three foot long appliance cord.

8. Status display: Visual indicator to display damper position through full range of travel.

9. External built-in travel limit switch to reverse direction.

10. Manual override with hex operator.

2.05 INPUT/OUTPUT SENSORS

A. Temperature Sensors:

1. Platinum resistance temperature detectors with resistance tolerance of plus or minus 0.1 percent at 70 degrees F, interchangeability less than plus or minus 0.2 percent, time constant of 13 seconds maximum for fluids and 200 seconds maximum for air.

2. Measuring current maximum 5 mA with maximum self-heat of 0.031 degrees F/mW in fluids and 0.014 degrees F/mW in air.

3. Provide 3 lead wires and shield for input bridge circuit.

4. Use insertion elements in ducts not affected by temperature stratification and smaller than 9 square feet. Use averaging elements where larger or prone to stratification. Sensor length 8 feet or 16 feet as required.

5. Use sensor holder with mounting plate and conduit enclosure with cover plate for elements mounted on ducts. Provide extension between plate and enclosure on insulated ducts.

6. Insertion elements for liquids shall be with brass socket with minimum insertion length of 2-1/2 inches. Provide lagging extensions on insulated pipes.

7. Room digital thermostats: Sensor with setpoint adjustment marked warmer/cooler, built-in override button, terminal block wiring connection and I/O communication port for portable monitoring device. Locking cover. blank cover in all public spaces

8. Outside air sensors: Watertight inlet fitting, shielded from direct rays of sun.

B. Static Pressure Sensors:

1. Unidirectional with ranges not exceeding 150 percent of maximum expected input.

2. Temperature compensate with typical thermal error or 0.06 percent of full scale in temperature range of 40 to 100 degrees F.

3. Accuracy: One percent of full scale with repeatability 0.3 percent.

4. Output: 0 - 5 vdc with power at 12 to 28 vdc.

C. Equipment Operation Sensors:

1. Status Inputs for Electric Motors:

a. U.L. Listed current sensing relay with split core current transformer, 1 amp @ 30 VAC adjustable setpoint output switch, adjustable mounting bracket, power and trip LED indication.

b. Constant speed fans and pumps: Output switch trip setpoint at 10% below the normal motor operating speed and current draw.

c. Variable speed fans and pumps: Output switch trip setpoint at 5% below the lowest motor operating speed and current draw as determined in the commissioning process, typically 20%.

d. Product: Veris Industries Hawkeye H-900, Kele D-150, Veris Industries.

D. Damper Position Indication: Potentiometer mounted in enclosure with adjustable crank arm assembly connected to damper to transmit 0 - 100 percent damper travel.

INSTRUMENTATION AND CONTROL DEVICES FOR HVAC 23 0913 - 4

PART 3 EXECUTION

3.01 EXAMINATION

A. Verify existing conditions before starting work.

B. Verify that systems are ready to receive work.

C. Beginning of installation means installer accepts existing conditions.

D. Sequence work to ensure installation of components is complementary to installation of similar components in other systems.

E. Coordinate installation of system components with installation of mechanical systems equipment such as air handling units and air terminal units.

F. Ensure installation of components is complementary to installation of similar components.

3.02 INSTALLATION

A. Install in accordance with manufacturer's instructions.

B. Locate all control devices except for sensors and devices integral to equipment within control panels, unless otherwise noted.

C. Install control devices in a readily accessible location. Refer to definitions in Section 23 0510.

D. Coordinate with Contractor and monitor the work so that other trades do not obstruct control devices or other items requiring access for service.

E. Device mounting:

1. All devices shall be permanently mounted and secured in place.

2. Gypsum Board and Plaster walls: Moly-bolt type anchor. No adhesive or plastic insert anchors.

3. Concrete Walls: Non-ferrous screws and expansion shields.

4. Concrete masonry units: Mount to recessed box or secure with moly-bolt type anchor.

5. Provide accessory wall adapter plates where required to cover block or wall opening edges.

6. Pipe and duct mounted devices: Secure to well or mounting flange. Provide well and flange extensions on insulated duct and pipe to clear insulation thickness.

7. Mount control valves with stem at or above the horizontal.

8. Mount dampers with blades horizontal.

F. Identification:

1. Nameplates: Identify all sensors mounted in mechanical rooms using device ID and number from control drawings with permanent label mounted adjacent to device.

Nameplates shall be engraved plastic laminate with uppercase black letters on a white field, 1/4 inch minimum height.

a. Include sensor type, normal setpoints information on nameplate.

b. Mounting: Attach nameplates with epoxy cement or non-ferrous screws after final painting.

2. Color code conductors with both ends identified with manufactured alpha-numeric self-adhesive vinyl tags, 3 mils thick, minimum, keyed to termination points.

G. Electrical wiring:

1. All control and interlock wiring shall be provided under this section.

2. No splices between field devices and control panels are permitted.

3. All Wiring materials and methods shall comply with Division 26 except:

a. Minimum wire size shall be 14 AWG(copper) for line voltages.

b. Minimum wire size shall be 18 AWG(copper) for signal.

4. Fire Alarm System Interface: Signal for fan shutdown shall be obtained from fire alarm output relay located in mechanical room adjacent to the starter/motor control center, unless otherwise noted.

5. Electric Operators:

INSTRUMENTATION AND CONTROL DEVICES FOR HVAC 23 0913 - 5

a. Power wiring for controls provided under Division 26 is shown on the Electrical Drawings. Provide conduit, conductors, power supplies and transformers as required for power to operate electric operators.

b. The feedback signal for each separately controlled damper operator shall be wired back to a terminal strip in the control panel for trouble-shooting purposes.

H. Check and verify location of thermostats and exposed control sensors with plans and room details before construction of wall assemblies. Locate between 42 to 48 inches above finished floor. Mount at common elevation within same space. Align with lighting switches . Refer to Section 26 0537.

I. Mount in center of 8x8 inch block face with recessed mounting box and accessory wall adapter plate covering block opening where mounted in concrete masonry units.

J. Use a single sensor for outside air temperature.

K. Mount outdoor thermostats and outdoor sensors indoors, with sensing elements outdoors on north side of building or in shaded location. Mount with sun shield.

L. Mount outdoor thermostats and outdoor sensors away from building discharge openings or doors where conditioned air from building will effect signal. Do not mount on positive pressurized HVAC devices where conditioned air can leak thru opening effecting signal.

M. Provide separable sockets for liquid elements. Mount sockets as specified in Section 23 2113 .

Cut element to length for full insertion into well and provide conducting compound.

N. Provide mounting flanges for air bulb elements with extensions as required on insulated ducts to clear insulation.

O. Install current sensing relays in starter enclosure for equipment served.

P. Install control valves in a readily accessible location.

Q. Install control valves with stems upright or horizontal, not inverted.

R. Provide mixing dampers of opposed blade construction arranged to mix streams.

S. Provide separate minimum outside air damper section adjacent to return air dampers with separate damper operator.

T. Install damper operators in accessible locations.

3.03 SCHEDULES

A. Refer to Sequence of Operation for valve normal position and to Drawings for valve coefficients.

END OF SECTION