North Platte LBF HVAC Replacement SOW.pdf

Statement of Work FAA‐C90‐422

Package HVAC Replacement Project

North Platte Air Route Surveillance Radar (ARSR) Site 33313 Highway 83

Wellfleet, NE 69170

Prepared By:

Federal Aviation Administration Chicago District Technical Support Center

AJW‐C22D

Elgin, Illinois

15 March, 2022

I

FAA‐C90‐422

Table of Contents

Section Section Title Dated

I‐II Table of Contents 03/15/2022

III‐IV North Platte ARSR Vicinity/Location Maps 03/15/2022

VI‐XIII Site Pictures 03/15/2022

Specification Title Dated

00 01 00

General Requirements

03/15/2022

Division 3 Concrete

Department of transportation, Federal Aviation Administration, Great Lakes Region Specification FAA‐GL‐

918D for the Construction of Terminal Facilities

Section 3A

Concrete Formwork and Reinforcement

05/21/2021

Section 3B

Cast‐In‐Place Concrete

05/01/2020

23 03 10

Packaged HVAC Rooftop Units

Appendix I

Schedule of Submittals

Appendix II

Government‐Furnished HVAC unit control panel O&M

Manual OAS 2.5 Version 1

Appendix III

Schedule of Government Furnished Equipment

II

Project Drawings Title Dated

LBF‐D‐ARSR‐G001

Cover Sheet/Drawing index HVAC Replacement Project

North Platte ARSR l Wellfleet, NE

LBF‐D‐ARSR‐C001

Site Plan HVAC Replacement Project

LBF‐D‐ARSR‐M001

HVAC Demolition Plan HVAC Replacement Project

LBF‐D‐ARSR‐M002

HVAC Construction Plans HVAC Replacement Project

LBF‐D‐ARSR‐M003

HVAC Installation Plan HVAC Replacement Project

LBF‐D‐ARSR‐M006

HVAC Controls HVAC Replacement Project

North Platte ARSR

Reference Drawings Title Dated

CE‐LBF‐5277A‐SO‐RE

11/28/2007

CE‐LBF‐5277‐11

Air Conditioning and Ventilation

02/22/2008

LBF‐D‐ARSR‐Q005

Common Air Route Surveillance Radar – Equipment Layout North

Platte ARSR

09/15/2015

III

Vicinity Map

IV

Location Map

V

North Platte Nebraska ARSR Site Pictures

North Exterior Ducts.

VI

South Exterior Ducts.

VII

Equipment Room Ceiling (Facing South).

VIII

Office.

IX

Existing North and South HVAC Data Plate.

X

Exterior (North Side).

XI

Interior (North Ducts).

XII

Interior (North Ducts).

SECTION 00 01 10 – GENERAL REQUIREMENTS

1.01 SUMMARY OF WORK.

A. The Contractor shall furnish all labor, equipment, insurance, etc. to complete the replacement of two 15‐Ton cooling (no heat), 208V three‐phase, factory curb mounted package air conditioning units and sheet metal duct work at the North Platte Air Route Surveillance Radar Site (ARSR) site located in Wellfleet, Nebraska. This work includes the following principle items:

1. Demolition of the existing HVAC units following the acceptance of the new package HVAC units by the COR as follows:

a. Recovery and disposal of the R‐22 refrigerant from both HVAC units in accordance with all applicable state and federal regulations.

b. Removal and disposal of the existing HVAC units as indicated on the drawings and in this statement of work.

c. Electrical demolition as follows:

(I) Removal and disposal of the exterior power safety disconnect switches, and conduit for the HVAC units as indicated on the drawings and in this statement of work.

(II) Removal and disposal of the existing power and cables for both HVAC units to Panel ‘A’. Interior conduit to remain.

(III). Removal and disposal of the existing control cables for both HVAC units to the interior thermostat. Interior conduit to remain.

(IV). Removal and disposal of the existing power and cables for both HVAC units to Panel ‘A’. Interior conduit to remain.

d. Removal and disposal of the existing interior supply and return ductwork for both HVAC units. This work includes permanently closing the exterior duct work openings indicated on the drawings and in this statement of work.

2. Furnish and install two (2) 15‐ton cooling (no heat) packaged HVAC units as follows:

a. Evaluation by a licensed mechanical engineer of the standard duct layout and airflow requirements shown on the drawing are consistent with the replacement HVAC units and recommended design changes to be considered.

b. Construction of an approximately 30’x20’X12” thick, 3,000 psi, reinforced, floating concrete pad as indicated on the drawings and in this statement of work.

c. Installation of two (2) dual stage, 15‐ton cooling (cooling only), side discharge, package HVAC units, with economizer and condenser hail guards as indicated on the drawings and in this statement of work.

d. Fabrication and Installation of new interior supply and return sheet metal ducts including the following:

(I) Installation of new mechanical devices (fire damper, adjustable supply air dampers, flexible connectors, diffusers, return air grills, etc. indicated on the drawings and in this statement of work.

(II) Installation of interior and exterior R‐12 insulation on all new ducts including the installation of a metal clad cover on the exterior supply and return ducts.

(III) Installation of all required interior and exterior galvanized steel supply and return duct support structure required for a complete installation.

e. Furnish and install new power cables and conduit from the new HVAC units to the Panel ‘A’ as indicated on the drawings and in this statement of work.

f. Furnish and install new control cables and conduit rom the new HVAC units to the Government‐Furnished HVAC control panel ACU‐1. This work includes the installation of the Government‐Furnished HVAC control panel and grounding as indicated on the drawings and in this statement of work.

g. Startup of the new HVAC units by a factory representative and on‐site equipment familiarization.

h. Balancing of the supply air diffusers as shown on the drawing.

3. Miscellaneous work as follows:

a. Construction of seven (7) road bollards indicated on the drawings and in this statement of work.

b. Replacement of the equipment room suspended ceiling system following the new duct installation. This work includes replacement of the 2’x4’ suspended ceiling grid. 2’x4’ lay‐in tiles, and all related work for a complete installation.

1.02 REGULATORY REQUIREMENTS.

A. When the Contractor observes that contract documents are at variance with OSHA, the National Electrical Code, or Federal, State, or local rules and regulations, notify the COR immediately.

1.03 QUALITY ASSURANCE.

A. Installer Qualifications: Engage an experienced installers for each trade and referenced in other sections of this Statement of Work.

B. Reference Section of this Statement of Work for additional requirements.

1.04. SUBMITTALS.

A. Reference Appendix I of this statement of work for submittal requirements.

B. Submit all submittals to the Contracting Officer via e‐mail.

1.05 WORK SCHEDULE/PHASING.

A. This project is to be scheduled when average outdoor temperatures does not exceed 70° F or approved by the COR.

B. Construction Hours. Work shall take place during normal business hours, 0700 to

1600, Monday through Friday, weekends and national holidays excluded.

C. Work shall be phased so that building shall be secured at the end of each work shift.

1.06 GOVERNMENT‐FURNISHED EQUIPMENT. (Reserved)

1.07 SECURITY REQUIREMENTS.

A. Contractor Personnel: The Contractor shall provide the Government with a list of the contractor's personnel as required by the Contracting Officer of site personnel.

1.08 DISPOSAL/CLEANING REQUIREMENTS.

A. The Contractor disposal of all debris on a daily basis and shall provide containers with covers for storage of debris at the site as required.

1.09 DEMOLITION.

A. All materials removed associated with this work shall be removed in such a manner to not affect or damage any existing equipment or structure. All waste material shall be hauled and be placed in a dumpster provided by the Contractor.

1.10 CUTTING AND PATCHING.

A. General Requirements: The Contractor shall be responsible for all cutting, fitting and patching, and back‐fill required to complete the work and to:

1. Make parts properly fit.

2. Uncover portions of the work to provide for installation of ill‐timed work.

3. Remove and replace work not conforming to requirements.

4. Remove samples of installed work as specified for testing.

5. Provide routine penetrations of non‐structural surfaces for installation of piping, electrical conduit, and/or ducting.

6. Return the site to its original condition.

B. Notification: Submit a written request to the Resident Engineer well in advance of executing any cutting or alteration which affects:

1. Work of the government or any separate contractor.

2. Structural integrity of any element of the project.

3. Integrity of weather‐exposed or moisture‐resistant elements or systems.

4. Efficiency, operation life, maintenance, or safety of operation elements.

5. Visual qualities of site‐exposed elements.

6. Potential disruption of the facility operation.

1.11 FIRE EXTINGUISHING EQUIPMENT.

A. The contractor shall have an equivalent of 2‐25 lb. class A and B fire extinguishers in the work area through the progress of the job. CO2 type fire extinguishers are acceptable.

1.12 IDENTIFICATION OF UTILITIES.

A. The Contractor shall be responsible for contacting the State of Nebraska underground utility locating service or third party locating service to schedule joint meet and/or site locate for this project.

B. FAA utilities: All work associated with the location and identification of buried communications, electrical, mechanical, or plumbing systems owned by the FAA, shall be performed by FAA personnel.

C. Utility Disruption: In the event that properly identified utility or communication services either overhead or buried, are damaged as a result of the Contractor’s activity, such services shall be immediately repaired and the COR and the Contracting Officer immediately notified.

1.13 GOVERNING DOCUMENTS.

A. The manufacturer’s products procedures shall supersede conflicts between the statement of work and drawings.

1.14 PROJECT MEETINGS.

A. The Contractor and COR shall conduct project meetings throughout the construction period as required by the COR.

1.15 FACILITY CUT‐OVER & INTERRUPTIONS IN SERVICE.

A. Only on‐site FAA maintenance personnel and the COR are authorized to energize and de‐energize equipment or to operate circuit breakers, switches, or fuses in FAA facilities. The COR has the authority to stop work at any time if work activities interfere with the operation of any FAA facility.

1.16 TEMPORARY FACILITIES.

NOTE: This facility operates 24/7 and may require access by FAA personnel any time of the day or night. The Contractor shall perform this work so that personnel may access to the building is possible during all working and non‐working hours for the duration of the project.

A. Temporary Electrical Power: 120V/240V electrical power is available from the existing building electrical service at no cost to the Contractor. All points of connection for electrical service and any modifications to the electrical system shall be approved by the COR.

B. Sanitary Facilities: Sanitary Facilities are not available at this work site. The Contractor shall provide temporary toilet facilities as required for their employees.

C. Water is not available at this facility for construction. The Contractor shall provide all water required to complete the project as stated.

D. Temporary Construction Aids:

1. The Contractor shall furnish, install, and maintain all construction aids and equipment to facilitate execution of work.

2. Removal of Temporary Facilities. The Contractor shall promptly remove all temporary facilities from premises at end of the project.

E. Traffic Control ‐ The Contractor shall provide all traffic control services as required for work near active roads. This includes all permits required by the city or state required to close traffic lanes as needed.

End Section 01 01 10

Federal aviation administration, Great Lakes Region Specification FAA‐GL‐918D For the Construction of Terminal Facilities

(Revised 05/21/2021)

DIVISION 3 ‐ CONCRETE

SECTION 3A

CONCRETE FORMWORK AND REINFORCEMENT

3A.1 DESCRIPTION OF WORK. Extent of work as indicated on the Statement of Work and drawings, and by the provisions of this section.

3A.2 CONCRETE FORMWORK.

a. Design of Forms. Forms shall conform to shapes, lines, and dimensions of the members shown on the plans, and shall be sufficiently tight to prevent leakage of mortar. They shall be properly tied together so as to maintain position and shape.

b. Form Removal. Forms shall not be loosened or removed until the concrete members have acquired strength sufficient to support their own weight. No additional loads shall be placed on the concrete for at least 48 hours after placing.

c. Form Ties. Form ties for concrete shall be of a type that will break back 1 1/2 inches from the concrete surface. Ties shall be removed to a minimum depth of 1 1/2 inches, and the surface patched.

3A.3 CONCRETE REINFORCEMENT.

a. Materials. Reinforcement bars shall conform to "Standard Specification for

Deformed and Plain Carbon‐Steel Bars for Concrete Reinforcement", ASTM A‐615.

All bars shall be Grade 60 deformed bars.

b. Cleaning and Bending Reinforcement. At the time concrete is placed, metal reinforcement shall be free from rust scale or other coatings that will destroy or reduce the bond. All bent bars shall be bent cold. No bars partially embedded in concrete shall be field bent except as shown on the drawings.

c. Placing Reinforcement. Metal reinforcement shall be accurately placed according to the plans, and adequately secured in position by concrete, metal, or other approved chairs, spacers, or ties.

Great Lakes Region Specification FAA‐GL‐918D

d. Splices in Reinforcement. No splices or reinforcement shall be made except as shown on the plans or as authorized by the COR.

e. Dowels

1. General Requirements.

a. Epoxy‐coated dowels: Dowels shall meet the requirements of ASTM A1078 /

A1078M ‐ 19 Standard Specification for Epoxy‐Coated Steel Dowels for Concrete Pavement sized as shown on the drawings. Dowels and the deformed reinforcing bars must have both ends cut clean and smooth with a saw, rather than sheared.

b. Dowel Anchoring Products: Use a two‐part high strength anchoring epoxy per ASTM D1763 that is suitable for both horizontal and vertical applications. Sakrete™ High Strength Anchoring Epoxy is known acceptable source.

2. Dowel Installation:

a. Apply epoxy anchoring product in accordance with the manufacturer’s installation requirements regarding temperature, equipment used to install the epoxy, and cure time.

b.Drill depth and size anchor holes 1/16" to 1/4" larger in size than the diameter of the anchor.

c. Ensure sure each hole is cleaned using a can of compressed air and a nylon brush.

d. The drilled hole should be dry and clean before the epoxy installation.

e. Coat the exposed portion of the dowel with a thin film of grease or other approved material to ensure proper bound‐breaking characteristics.

f. Dowels of the type, size, spacing, and at the location specified on the Plans shall be installed in accordance with the Plan details for full‐depth repairs.

Great Lakes Region Specification FAA‐GL‐918D

g. Prior to placing concrete, the vertical exposed faces of the existing slabs shall be thoroughly cleaned of contaminates using wire brushing or other methods approved by the Engineer. Extra care must be taken to remove all existing silicone of other joint sealant form the exposed concrete faces.

h. At no time shall dowels be driven into a dowel hole with sledge hammers or other devices.

3. Concrete Protection for Reinforcement.

a. The reinforcement shall be protected by the thickness of concrete shown on the drawings. Where not shown, the thickness of concrete over the reinforcement shall be as follows:

b. Where concrete is deposited against the ground without the use of forms, not less than 3 inches.

c. Where concrete is exposed to the weather or to the ground but placed in forms, not less than 2 inches for bars larger than number 5, and 1 1/2 inches for number 5 bars or smaller.

End Section 3A

Federal aviation administration Great Lakes Region Specification FAA‐GL‐918C

For the Construction of Terminal Facilities (Revised 05/01/2020)

DIVISION 3 ‐ CONCRETE

SECTION 3B

CAST‐IN‐PLACE

CONCRETE

3B.1 DESCRIPTION OF WORK. Extent of work as indicated on the Statement of Work and drawings, and by the provisions of this section.

3B.2 MATERIALS.

A. Cement shall conform to Specification for Portland Cement ASTM C‐150, Type I, or

Specification for Air‐Entraining Portland Cement ASTM C‐175, Type 1A, unless otherwise specified. The concrete shall have a minimum 28‐day compressive strength of 3,000 PSI, a maximum slump of 4 inches, and a maximum aggregate size of 1‐inch. The concrete mix shall contain an air‐entraining admixture. Air content shall be 5 to 7 percent. The Contractor shall give the COR a certificate from the concrete supplier, bearing the intended job mix and certifying that the concrete delivered will meet the above requirements. The Contractor shall obtain approval of the job mix from the COR prior to placing concrete.

3B.3 PREPARATION OF EQUIPMENT AND PLACE OF DEPOSIT.

A. Before placement, all equipment for mixing and transporting the concrete shall be cleaned. All debris and ice shall be removed from the places to be occupied by the concrete. Forms shall be thoroughly wetted (except in freezing weather) and oiled prior to placing reinforcing steel. The reinforcement shall be thoroughly cleaned of ice, dirt, rust scale, or other coatings.

B. Water shall be removed from place of deposit before concrete is placed. All laitance and other unsound material shall be removed from hardened concrete before additional concrete is added.

3B.4 CONVEYANCE.

A. Concrete shall be conveyed from the mixer to the place of final deposit by methods that will prevent segregation or loss of materials. Equipment for chuting concrete shall be of such size and design so as to ensure a continuous flow of concrete at the delivery end without segregation of materials.

For the Construction of Terminal Facilities

3B.5 PLACEMENT.

A. Concrete shall be placed within 1 1/2 hours after mixing begins. Concrete shall be deposited as nearly as practicable in its final position to avoid segregation due to re handling or flowing. The placing of concrete shall be carried on at such rate that concrete is at all times plastic, and flows readily into the spaces between the bars.

No concrete that has been contaminated by foreign material shall be used, nor shall re‐tempered concrete be used.

B. When placing is started, it shall be carried on as a continuous operation until placement is completed.

C. Concrete shall be placed in layers not exceeding 18 inches deep, and vibrated in place. During and immediately after depositing, the concrete shall be consolidated by vibrators. The concrete shall be thoroughly worked around reinforcement, around embedded fixtures, and into corners. Accumulations of water on the surface of the concrete due to water gain, segregation, or other causes, shall be prevented as much as possible by employing proper placement, consolidation, and finishing practices. Provisions shall be made to remove such water as may accumulate, so that under no conditions will concrete be placed in such accumulations.

D. Vibrators shall be the internal immersion type, operating at speeds of not less than

7,000 RPM. Vibrators shall be kept constantly moving in the concrete and shall be applied at points uniformly spaced not further apart than the radius over which the vibrator is visibly effective. The entire depth of a new layer of concrete shall be vibrated. The vibrators shall penetrate several inches into the layer below to insure thorough union of the layers. The vibrator shall not be held in one location long enough to draw a pool of grout from the surrounding concrete. Vibration shall be such that the concrete becomes uniformly plastic.

3B.6 FOOTINGS.

A. All footings and foundations without footings shall bear on firm, undisturbed soil.

For the Construction of Terminal Facilities

3B.7 CYLINDRICAL CONCRETE PIERS.

A. All cylindrical concrete piers, if required, shall be formed to full depth in fiber forms. Tops of piers shall be finished flat within the confines of the fiber forms.

No spillage (mushrooming) over the tops of forms will be permitted. Where conduit emerges from vertical surfaces of concrete piers, no appreciable amount of concrete shall be permitted to spill through forms adjacent to such conduit.

B. Fiber forms for cylindrical concrete piers shall be spirally constructed of laminated plies of fiber. The total wall thickness shall be as published by the manufacturer. The width of each ply shall not be less than 6 inches. Plies shall be laminated with an adhesive of a non‐water‐sensitive type, with a proven record of satisfactory service in concrete forms. The exterior surface shall be uniformly wax impregnated for weather and moisture protection. The interior surface shall be coated with pure polyethylene uncontaminated by paraffin or other additives. A‐Coated Sonotube forms by Sonoco Products Company of Hartsville, South Carolina, are among the products that meet these Specifications.

C. Remove all loose soil from bore holes so that concrete will bear on undisturbed soil. Support forms rigidly and in proper horizontal and vertical alignment. After pouring, remove only that part of each form that will be exposed above grade.

Backfill excess space between bore holes and forms with thoroughly compacted inorganic soil. Do not use sand backfill unless adjacent undisturbed soil is sand.

3B.8 ANCHOR BOLT INSERTS.

A. No drilling for or placing of anchor bolt inserts or anchors will be permitted in concrete for a period of three days after placement, unless noted otherwise on the drawings.

3B.9 CURING.

A. Provision shall be made for maintaining concrete in a moist condition for a period of at least 5 days after placement.

For the Construction of Terminal Facilities

B. In lieu of wet curing, one coat of a concrete curing sealer which forms a film over the concrete surface, may be used for curing the concrete. The sealer shall meet the ASTM C‐309 standard for moisture retention. The compound shall be a type that does not permanently discolor the concrete. Dayton Superior J11W is one of the products which meet this Specification. Where concrete is to receive vinyl composition tile (VCT), or any other flooring, curing compound shall not be used, and only wet sheet curing is allowed. On exposed surfaces, application shall be made immediately after the concrete has been finished. If there is any delay, the concrete shall be kept moist until the application is made. After the forms are removed, the concrete shall be sprayed lightly with water, and then the coat of curing compound applied. If the forms (wood only) cannot be removed within 48 hours, they shall be wetted down and kept wet until their removal, and then the compound applied as above.

3B.10 COLD‐WEATHER REQUIREMENTS.

A. Adequate equipment shall be provided for heating concrete materials and protecting concrete during freezing or near‐freezing weather. No frozen materials or materials containing snow or ice shall be used. Concrete shall not be placed on frozen soil.

B. All reinforcement, forms, fillers, and ground which will make contact with concrete shall be free from snow and ice. Whenever the temperature of the surrounding air is below 40oF, all concrete placed in forms shall have temperatures of 45oF or higher, after placement. Adequate means shall be provided for maintaining this temperature for 4 days. Any additional time necessary to ensure proper curing of the concrete shall be provided as directed by the COR. The housing, covering, or other protection used in connection with curing, shall remain in place and intact at least 24 hours after the artificial heating is disconnected. Do not use salt or other chemicals to prevent freezing.

3B.11 HOT‐WEATHER REQUIREMENTS.

A. In hot weather, suitable precautions shall be taken to avoid drying of the concrete prior to finishing operations. Use of windbreaks, sunshades, fog sprays, or other devices shall be provided as directed by the COR.

For the Construction of Terminal Facilities

B. Concrete deposited in hot weather shall not have a placing temperature that will cause difficulty from loss of slump, flash set, or cold joints. Concrete temperature shall be less than 90oF.

3B.12 SLUMP TESTS.

A. If required by the project drawings or specification, concrete shall be tested for consistency at the mixer or at the place of deposit if delivered ready‐mixed. The sample shall be taken immediately from the batch and tested by the Contractor in the presence of the COR in accordance with ASTM C143. Concrete with slump in excess of four inches shall be rejected.

B. If the COR determines that concrete strength and air entrainment tests are needed, the FAA will make arrangements for and bear costs of such tests.

3B.13 DELIVERY TICKETS.

A. At the time of concrete delivery, the Contractor shall give the COR a copy of the delivery ticket bearing the quantity, strength, and air entrainment of the concrete delivered.

3B.14 CONCRETE CRACK REPAIRS AND PATCHING.

A. Concrete repair epoxies shall meet the requirements of the American Concrete Institute publication 503.7‐07, Specification for Crack Repair by Epoxy Injection.

B. Apply epoxy in accordance with the manufacturer’s instructions including outside temperature and humidity.

C. Protect persons, vehicles, building site and surrounding buildings from injury resulting from concrete restoration work.

D. Clean masonry surfaces only when air temperatures are above 40 degrees F (4 deg.C) and will remain so until concrete has dried out, but for not less than 7 days after completion of cleaning.

E. Do not perform any patching work if precipitation is expected. In case of unexpected precipitation, work shall cease and all uncured material shall be adequately protected with an impermeable polyethylene sheet.

For the Construction of Terminal Facilities

F. If either the ambient or subsurface temperature is expected to fall between 35F (2C) and 40F (4C) during curing and ultimate drying of the patching compound, then the cold weather precautions shall be taken as follows:

1. SYSTEM 44‐FS series patching compounds shall be substituted for SYSTEM 44 Regular grades. Do not mix or place different grades together.

2. Curing times shall be extended to compensate for lower temperature cure.

3. Do not proceed if temperatures will drop below freezing before patching compound has reached final set. Any material disrupted by early freezing must be removed and replaced under appropriate controls or conditions.

4. If auxiliary heating will be used to protect freshly placed materials from freezing, equipment must not directly vent exhaust gases onto the repair materials or into repair enclosure air. This may cause carbonation and low strength. Use moderate temperatures and heated air or radiant heat.

5. If ambient or surface temperature is expected to rise above 86F (30C) during application and curing of the patching compound, then the hot weather precautions shall be taken as follows:

6. SYSTEM 44 series patching compounds grades shall be substituted for FS grades. Do not mix or place different grades together.

End Section 3B

SECTION 23 03 00– PACKAGE HVAC UNITS

1.01 BASIC MATERIALS AND METHODS.

A. Applicable Publications. The following standard publications of the issues currently in force form a part of this specification. The contractor shall perform all work not included in this specification in accordance with these publications:

Air‐Conditioning, Heating

And Refrigeration Institute

(AHRI)

AHRI 340/360 (I‐P)2019

Performance Rating of

Commercial and Industrial

Unitary Air‐Conditioning and

Heat Pump Equipment

American Society of

Heating, Refrigerating and

Air‐Conditioning Engineer

Standard 15‐2019 Safety

Standard for Refrigeration

Systems

International Building

Code

ICC‐IBC‐2021

International Organization for Standardization

ISO 9002

National Fire Protection

Association 70 – National

Electrical Code

Latest Edition

Sheet Metal and Air

Conditioning Contractors’

National Association

Latest Edition

State of Nebraska

Building Code

International Building

Code 2012 edition or latest adopted

Federal Aviation

Administration

Standards

FAA‐STD‐1217H,

Interior Electrical

Work

B. Delivery, Storage, and Handling.

1. Handle, store, and protect equipment and materials to prevent damage before and during installation in accordance with the manufacturer's recommendations.

2. Replace damaged or defective items.

1.02 PACKAGE HVAC UNITS.

A. General Requirements:

1. The Contractor shall furnish and install two (2) package rooftop HVAC units (cooling only) complete with controls and capacities as specified in this statement of work and drawings. York Sunline™AV‐15 15 Ton cooling packaged

HVAC units meet the stated requirements.

2. Vertical supply and return discharge as shown on the project drawings.

3. Miscellaneous components. Both units shall be equipped with the following:

a. Condenser hail guards.

b. FreezeStat.

c. Return air smoke Detector.

d. GFCI Outlet.

B. Component Requirements. The HVAC units shall be equipped with the following:

1. Dual refrigerant circuits, each with a high efficiency Scroll type, hermetically sealed compressors. This All units shall have two complete refrigeration circuits, which shall include separate compressor, cooling coil circuit, expansion valve, condensing coil circuit, filter drier, service valves, piping, and other necessary components. All refrigeration system components shall be completely factory assembled, fully charged, piped, wired, tested, and shipped in one piece with a single‐point power connection.

2. Low ambient controls that allow unit operation down to 0°F, and compressor crankcase heaters. Each HVAC unit shall be equipped with, a fully modulating economizer, economizer dampers, economizer damper hood, and economizer gravity exhaust dampers.

3. Capable of operating with the existing 208V‐3PH‐60HZ power supply A/C control system.

C. Cabinet Casing and Frame.

1. The cabinet shall be constructed from galvanized steel, with a baked enamel finish on all externally exposed surfaces, certified at 1000 hours salt spray test per ASTM‐B117.standards. Cabinet panels shall be easily removable for servicing.

2. Factory‐installed filter access panel to provide filter access with tool‐less removal. Evaporator fan cabinet interior shall be insulated with a minimum

½” thick flexible fiberglass insulation coated on the air side.

3. Power wiring shall enter unit cabinet at a single factory pre‐drilled location.

4. Factory installed, sloped condensate drain pan made of a non‐corrosive material, providing a minimum ¾” connection with both vertical and horizontal drains and shall comply with ASHRAE 62.

5. Holes shall be provided in the base rails for rigging shackles to facilitate overhead rigging, and forklift slots shall be provided to facilitate maneuvering.

D. Compressors.

1. Scroll type, hermetically sealed compressor with internal overload protection, loss‐of‐change/low pressure and freeze protection switches, and high pressure cut outs.

2. Shall have internal spring isolation and sound muffling to minimize vibration and noise, and be externally isolated on a dedicated, independent mounting.

3. Each compressor shall have its own completely independent refrigeration circuit.

4. Suction and liquid line service gauge ports, full refrigerant charge.

E. Evaporator Coil.

1. Coils shall be non‐ferrous construction with aluminum fins mechanically bonded to durable copper tubes.

2. Coils shall be pressure leak tested.

3. Coil shall be of the full face active design.

F. Supply Air Blower.

1. Supply air blower shall have permanently lubricated and sealed ball bearings.

2. The motor shall have inherent automatic‐reset thermal overload protection.

3. Fan shall be made from steel with a corrosion‐resistant finish and shall be dynamically balanced.

G. Outside, Return, and Exhaust Air Dampers.

1. Return air dampers (0 ‐ 100%) shall be furnished with damper motors.

Gravity exhaust air dampers shall be provided with minimum position control and adjustment.

2. Filter Section: Filter section shall consist being able to use commercially available MERV‐11 filters.

3. Filters shall be accessible through an access panel with “no‐tool” removal.

One spare set‐of filter shall be supplied by the contractor for each unit.

H. Condenser Coil.

1. Coils shall be non‐ferrous construction with aluminum fins mechanically bonded to durable copper tubes with all joints brazed.

I. Condenser Fans.

1. The condenser fan shall be of the direct driven propeller type and shall discharge air vertically.

2. Fans shall have aluminum blades riveted to corrosion resistant steel spiders and shall be dynamically balanced.

J. Refrigeration piping.

1. Refrigerant piping shall be completely factory installed and operationally tested before shipment.

2. Each circuit shall be complete with dryers, thermometer well, suction, and liquid level device gauge ports, high pressure switch, and loss of charge switch.

K. Controls and Safeties.

1. Each unit shall be complete with a self‐contained low‐ voltage control circuit.

2. Incorporate compressor over‐temperature and over‐ current safety devices to shut off the compressor. Each unit shall be prevented from re‐ starting for a minimum of five (5) minutes after shutdown.

1.03 SHEET METAL DUCT CONSTRUCTION.

A. General Requirements.

1. All sheet metal and flexible ductwork shall conform to SMACNA low pressure duct construction standards, latest edition.

B. Sheet Metal Ductwork.

1. Sheet metal ductwork shall be constructed of minimum of 25‐gauge galvanized steel sheets.

2. Ducts shall be straight and smooth on the inside, with joints neatly finished.

3. All edges and slips shall be hammered down to leave a smooth interior duct finish.

4. Joint Connections. Joint connections shall be standing S, or bar reinforced.

5. Joints for Ducts. Joints for ducts shall be made substantially airtight, and no dust marks from air leaks shall show at duct joints.

6. Laps at the Joints for Duct System. Laps at the joints for the duct system shall be made in the direction of air flow. Butt, punch, or bolt connection in standing seams shall be spaced at fixed centers no greater than 6" apart.

7 . Interior and Exterior Insulation.

a. Interior and exterior shall have a minimum R‐12 rating.

b. Exterior Insulation:

1. The entire exterior surface of all exterior ductwork shall be coated with two coats of duct sealer.

2. Sealer specifically designed for duct weatherproofing shall be used and applied per manufacturer’s recommendations. Total coating thickness shall be a minimum of 10 mils.

3. External ducts shall be covered with a self‐adhesive outdoor metal cladding jacket consisting of a laminated vapor barrier and waterproofing membrane for installation over either fiberglass or foam board insulation located above ground outdoors.

4. Outdoor jacket shall consist of a foil polymer laminated film with a coating of rubberized bituminous compound or acrylic adhesive that allows membrane to self‐adhere to the substrate. Polyguard, Inc. Alumaguard® All‐Weather, Self‐Adhesive, Outdoor Jacket is a known acceptable source for this requirement.

1.04 TESTING AND BALANCING.

A. The contractor shall test, perform airflow measurements, adjust and balance the new A/C units, ductwork and distribution system. The testing, adjusting and balancing shall be performed by a National Environmental Balancing

Bureau certified firm. Provide electronic copies of the test report.

B. New HVAC units shall be tested to ensure performance in accordance with the controls operation described in the drawings with the COR present.

1.05 TRAINING.

A. On‐site training shall be provide to the site personnel during start‐up of both units performed by factory‐trained technicians or representatives.

B. Training shall include:

1. System overview.

2. General theory of operation.

3. System operation.

4. Alarm formats.

5. Failure recovery procedures.

6. Troubleshooting.

7. Paper copies of all operating and maintenance manuals.

1.06 ELECTRICAL MATERIALS AND METHODS.

A. All electrical work is to be accomplished in accordance with the following codes and standards.

1. Federal Aviation Administration Standard FAA‐C‐1217H, Interior Electrical work (available on‐line)

2. National Fire Protection Association NFPA 70, National Electrical Code, Latest Edition.

B. Conduits.

1. Insulated conductors shall be installed in rigid galvanized steel conduit or EMT conduit in accordance with the NEC requirements.

2. Minimum size of conduit shall be 3/4", unless otherwise noted on the drawings. Power conductors for new A/C units shall be in 1 ¼” minimum size conduit. Each conduit run shall be complete before any conductors are drawn in.

3. Exposed conduit shall be installed parallel to or at right angles with the lines of the building unless shown otherwise. Field bends shall be avoided where possible and, where necessary, shall be made with approved hickey or conduit‐ bending device. Radius of field bends shall not be less than 10 times the inside diameter of the conduit.

4. Terminal electrical connections to motors or motor‐driven equipment shall be made with a 12" minimum length of 1 ¼” flexible metallic conduit. Such conduit shall be approved by Underwriters Laboratories. The flexible conduit shall have a liquid tight jacket of plastic, synthetic rubber, or neoprene extruded overall.

Connections between rigid conduit, conduit fittings, and other junctions and the flexible conduit shall be made with fittings recommended by the liquid tight flexible metal conduit manufacturer.

5. The use of non threaded‐type fittings will not be permitted with rigid conduit.

All rigid conduit terminals requiring locknuts shall be furnished with double locknuts and insulated bushings rated 150°C.

6. All suspended conduits shall be rigidly supported from the structure by means of approved conduit hangers or clamps firmly anchored in place and spaced at intervals not to exceed 10 feet in accordance with minimum requirements of

NEC.

C. Conductors.

1. Conductors shall be copper, type THWN rated at 600 volts. Minimum size of wire shall be as shown on the drawings and not less than #1 AWG for A/C unit power conductors and not less than #2AWG for A/C unit ground conductors.

2. All wiring, including feeders, shall be color coded. Three‐phase color coding

(black, red, and blue) shall be continued through the system to the point of utilization. In no case shall green be used for other than equipment grounding conductor, nor white for other than the neutral conductor.

3. No splices or joints shall be made in either feeders or branch circuits except at outlets, accessible junction boxes, or accessible raceways. Joints in circuit wiring shall be made mechanically and electrically secure and made with solderless connectors. Unless properly insulated by the connectors, all joints shall be taped with plastic tape in a manner that shall make their minimum insulation equal to the insulation of the conductors.

4. New cables shall be meg‐ohm tested following installation, prior to installation, with the COR present.

5 . Grounding and Bonding.

a. All metallic non‐current carrying parts of electrical equipment shall be grounded with an equipment grounding conductor whether or not shown on the drawings. The equipment grounding conductor shall be green insulated copper conductor unless otherwise indicated.

b. If this conductor is not sized, or shown on the drawings, it shall be sized in accordance with the applicable sections of the National Electrical Code and in no case shall it be smaller than #8 AWG.

c. The equipment grounding conductor shall be connected to the grounded conductor (neutral) only at the main service disconnect.

c. The equipment grounding conductor shall be installed in the same conduit as its related branch and feeder conductors and shall be connected to the ground bus in the branch or distribution panel board.

d. Ground fittings shall be copper and class II type fittings.

e. All conduits entering junction coxes or devices shall have ground bushings installed and bonded to the equipment with #6 bare copper wire.

D. Safety Disconnect Switches And Fuses. Safety disconnect switches and fuses shall meet the following Specifications.

a. General. Unless specified otherwise, all switches for circuit voltages of

600VAC or less, shall be heavy duty (Type HD), UL listed, and shall bear the UL label. The switches shall be NEMA 1 or NEMA 3R, as required by the drawings or special Specifications.

b. Switch Interiors. All switches shall have switch blades which are fully visible in the OFF position when the switch door is open. All current‐carrying parts shall be of high‐ conductivity copper, designed to carry the rated load without excessive heating. Switches shall have removable arc suppressors where necessary to permit easy access to line side lugs. Lugs shall be front removable and UL listed for 60�C or 75�C, aluminum or copper wires.

c. Switch Mechanism. Switches shall quick‐make, quick‐break, such that during normal operation of the switch, the operation of the contacts will not be capable of being restrained by the operating handle after the closing or opening action of the contacts has started. The operating handle shall be an integral part of the box, not of the cover. Switches shall have provisions for padlocking the switches in the OFF position with at least three locks.

Switches shall have a dual cover interlock to prevent unauthorized opening of the switch door when the handle is in the ON position, and to prevent closing of the switch mechanism with the door open. The handle position shall indicate whether the switch is ON or OFF.

d. Enclosures. Covers on NEMA 1 enclosures shall be attached with pin type hinges. NEMA 3R enclosures shall be securable in the open position. NEMA 3R enclosures for switches through 200 amperes shall have provisions for interchangeable bolt‐on hubs. Hubs shall accommodate the conduits of the diameters indicated on the drawings. NEMA 3R enclosures shall be manufactured from galvanized steel. All enclosures shall have a gray baked enamel finish, electrodeposited on cleaned, phosphatized steel.

e. Ratings. All fusible switches rated 100 through 600 amperes at 240 volts, and

30 through 600 amperes at 600 volts, shall have a UL‐approved method of field conversion from standard Class H fuse spacing to Class J fuse spacing.

The switch also must accept Class R fuses, and have provisions for field installation of a UL‐listed rejection feature to reject all fuses except Class R.

The UL‐listed short circuit rating of the switches shall be 200,000 rms symmetrical amperes when Class R or Class J fuses are used with the appropriate rejection scheme. The UL‐listed short circuit rating of the switch, when equipped with Class H fuses, shall be 10,000 rms symmetrical amperes.

f. Fuses. All fused switches meeting the above Specifications shall be fused with dual element, time‐delay, UL Class RK5 fuses, of the continuous current rating specified on the drawings. One set of spares shall be furnished for each fusible device. The fuses' interrupting rating shall be at least 10,000 rms symmetrical amperes.

End Section 23 03 00

APPENDIX I – SCHEDULE OF SUBMITTALS

Submittal No. Section Title

D at e

R ec e iv ed at e

A p p ro ve d Submittal Requirements

(electronic copies via e‐mail)

1.

00 01 00

Construction

Schedule

○ Contractor’s schedule including all major construction activities, including, but not limited to project mobilization, sequence of work, duration of work line items, etc.

2. Section 3B

Concrete

○ Delivery tickets indicating 3,000 P.S.I/28 day compressive mixture for concrete delivered.

3. 00 01 00 New Duct Layout

○ Report for the evaluation of the standard duct layout and airflow requirements shown on the drawing are consistent with the replacement

HVAC units, including recommended design changes to be considered.

4. 23 03 00 Package HVAC units

○ Technical/general product information for the new

HVAC units including the following:

○ Engineering specifications.

○ Installation instructions.

○ Operating details/wiring schematics.

○ O&M Manuals.

Submittal No. Section Title at e

R ec e iv ed at e

A p p ro ve d Submittal Requirements

(electronic copies via e‐mail)

5.

23 03 00

New Duct Work

○ Shop drawing showing the final Layout of the exterior and interior sheet metal duct work with equipment clearances considered.

5.

23 03 00

Mechanical

& Electrical

Devices

○ Technical/general product information for the new

HVAC mechanical devices as follows:

○ Diffusers.

○ Backdraft Dampers.

○ Fire Damper.

○ Flexible seals.

○ Duct insulation (interior and exterior metal clad insulation).

○ Safety disconnect switches.

○ Junction boxes.

○ Power Cable.

○ Breakers.

APPENDIX II – HVAC CONTROLLER MANUAL

OAS

2.5 Version 2/19/2018

OAS

2.5

User’s Guide

OAS

2.5 User’s Manual

Table of Contents

General Information

Manufacturer

Definitions

Quick Reference

Installation

5.1 Physical Installation

5.2 Electrical Requirements

5.3 Connections

Operation

6.1 Introduction

6.2 User Inputs

6.3 System Status Lights

6.4

Operational States

6.5

Sequence of Operations

Troubleshooting

Parts List

Schematics

Appendixes

A Thermostat Setup

B

OAS

Functional Test

OAS

2.5 User’s Manual

Table of Contents

General Information

Manufacturer

Definitions

Quick Reference

Installation

5.1 Physical Installation

5.2 Electrical Requirements

5.3 Connections

Operation

6.1 Introduction

6.2 User Inputs

6.3 System Status Lights

6.4

Operational States

6.5

Sequence of Operations

Troubleshooting

Parts List

Schematics

Appendixes

A Thermostat Setup

B

OAS

Functional Test

OAS

2.5 User’s Manual

General Information:

This user manual is intended to accompany the

OAS

2.5

HVAC

Controller.

The

OAS

HVAC

controller is a

FAA

designed

HVAC

controller for use at critical

FAA

facilities that require reliable redundant

HVAC

control.

The

OAS

is a simple yet robust control system which captures specific operational criteria important to

NAS

equipment.

Some of these features are listed below:

1. Redundant control of

HVAC

Units

2. Primary Unit Selection

3. Adjustable Set Points

4. Automatic Unit Switch Over

5. System Status Lights

6. Audible and Visual Alarms

7. Audible Alarm Silence

8. Simplified Troubleshooting

9. Commercially Available Replacement Parts

10. Ease of Use and Reparability

11. ERMS

compatibility

Manufacturer Information:

The

OAS

2.5 was designed by

NDP

Infrastructure Engineering (Jonathan Salter, 202.744.1408) and manufactured by:

The

FAA

National Staging Area

(AJW-‐2C15P)

S.

Geospace Dr

Independence, MO

64056

Ph:

(816) 329-‐3970 http://stagingarea.faa.gov

OAS

2.5 User’s Manual

Definitions:

Dehumidify

The mechanical process of reducing the air humidity.

OAS

Overtemp Automated System

FAA

specific controller that provides control to a Unit, fully redundant

HVAC

system.

These systems are typically associated with unoccupied electrical equipment rooms.

Overtemp Condition where the room temperature becomes greater than what is considered acceptable for a normally operating

HVAC

Unit.

An Overtemp situation indicates that the selected

HVAC

Unit is not functioning properly.

Set Point

The manually inputted temperature setting for an associated thermostat.

Relay

Electronic device that when activated, allows current to pass through.

Room Temperature Actual Current Temperature of the Equipment Room as measured by the

OAS.

OAS

2.5 User’s Manual

OAS

Quick Reference:

Figure 1:

OAS

Quick Reference

Alarm:

Red Visual

Alarm Light and

Audible Alarm

System Status Lights

Indicate the presence of Control Power and a call for operation for both

HVAC

Units

Room Temperature

Control Thermostat

(T1) Provides Control to the Active

HVAC

Unit.

Setpoint input for the desired room temperature

Room Overtemp

Thermostat (T2)

Setpoint input for the overtemp switchover

Primary Unit Selector

Switch Manual control point for the selection of the desired primary Unit

Audible Alarm Silence

When the controller is in Alarm, this button silences the audible alarm tone.

Overtemp Reset

Button Resets the

Controller from an

Alarm

OAS

2.5 User’s Manual

Installation:

5.1 Physical Installation:

The

OAS

is contained within a 10”x16”x5” electrical box.

The box contains mounting holes for attaching the box to a supporting wall or stand.

The controller should be mounted at chest level in a central location where the ambient temperature is representative of the room.

Locating the unit on an uninsulated outside wall, near equipment exhaust, or in a stagnant air area may cause the system to operate inefficiently.

If space is not available for the

OAS

in a preferred location, a separate remote temperature sensor option can be added.

of these sensors are required, one for each thermostat on the

OAS.

The sensors must be setup within the thermostat settings.

Use of remote sensors should be limited to the greatest extent possible.

Buttons, thermostats and switches shall be accessible and warning light shall be generally visible within the associated room.

Allow for 3’ of clearance from the face of the control box per the latest revision of the

NEC.

5.2 Electrical Requirements:

All requirements of the most current revisions of

FAA-‐STD-‐19

and

FAA-‐C-‐1217

shall be followed.

All associated control wires run between the Controller and

HVAC

Units shall be contained within conduits.

Any outdoor conduit runs shall be rigid type with threaded connections or liquid-‐tite flexible conduit.

The

OAS

is powered by low voltage

24VAC,

supplied by the associated

HVAC

Units.

To fully isolate power from the controller, each

HVAC

must be electrically disconnected.

The

OAS

does not require a separate power circuit and the only energized power within the controller will be the

24VAC

provided from the

HVAC

Units.

Warning:

When attaching or changing wired connections within the

OAS,

ensure power is electrically isolated from

BOTH

HVAC

Units.

Failure to do so may cause sparks, damage to the

OAS,

damage to the

24VAC

Transformers in the

HVAC

units, and/or personal injury.

OAS

2.5 User’s Manual

Installation:

5.1 Physical Installation:

The

OAS

is contained within a 10”x16”x5” electrical box.

The box contains mounting holes for attaching the box to a supporting wall or stand.

The controller should be mounted at chest level in a central location where the ambient temperature is representative of the room.

Locating the unit on an uninsulated outside wall, near equipment exhaust, or in a stagnant air area may cause the system to operate inefficiently.

If space is not available for the

OAS

in a preferred location, a separate remote temperature sensor option can be added.

of these…