B100 Engine Build Shop HVAC replacement.doc

Scope of Work and Specifications

For

Bldg 100- Engine Test Facility

Engine Build Shop HVAC Replacement Project

Located at

U.S. Coast Guard Base

Elizabeth City, N.C.

December 2020 Commanding Officer

United States Coast Guard

Base Elizabeth City

Facilities Engineering Department Elizabeth City, N.C. 27909 SCOPE: Contractor shall provide all supervision, labor, equipment, parts and materials necessary to replace two (2) existing failed HVAC systems. These HVAC units are each rated at (5) tons and are packaged water source heat pumps.

This work is located at the USCG Base Elizabeth City, NC in building 100 and serves the area known as the Engine Build Shop.

These units are known as HP-2 and HP-3.

2. GOVERNMENT FACILITIES AND UTILITIES: Electrical power is available on the site. The Contractor will be permitted to utilize these utilities in performing the work, provided that the existing systems are not overloaded. Telephone services will not be available for use by the contractor.

2. MATERIALS AND LOCATIONS:

a. Materials shall be delivered to the jobsite in their original unopened packages, clearly marked with the manufacturer’s name, brand name, and description of contents. Storage shall be in accordance with manufacturer’s recommendations in a clean, dry, well-ventilated area. Stored materials shall be protected from sunlight, and kept away from excessive heat. Insulation board shall not be exposed to flame or other ignition sources. The contractor shall not store any highly flammable materials in the work area. Sufficient area for staging is available on site; storage areas will be pre-approved by the Contracting Officers Representative (COR). Special precautions shall be taken to ensure construction materials and debris does not enter the airfield, runways, or taxiways.

b. The Contractor is required to comply with local VOC laws and regulations. All applicable Material Safety Data Sheets shall be available upon request.

4. SCHEDULE OF WORK: Completion of work shall be accomplished within 30 calendar days from acceptance of submittals. The Contractor shall perform all work during normal base work hours. The base normal working hours are 8:00 am to 4:30 pm, Monday through Friday, but the contractor is not limited to these hours. If the contractor is going to work outside normal working hours, permission must be obtained from the COR (Mark Croley, 252-335-6569).

5. EXISTING CONDITIONS: The contractor is expected to satisfy himself as to the existing conditions and the work to be performed. The contractor shall verify all dimensions and equipment data prior to ordering materials and commencement of work. A site visit should be arranged with Mark Croley by email at Mark.E.Croley@USCG.mil

6. LIABILITY OF CONTRACTOR: Any damage to government property caused by the contractor shall be repaired or replaced by the contractor at no cost to the government. The contractor shall not disconnect any service without approval from the COR.

7. INSPECTION AND ACCEPTANCE: The COR will accomplish inspection and acceptance of work.

8. LABOR LAWS: The Davis-Bacon Act applies to the procurement.

9. SAFETY: The Contractor is wholly responsible for work site safety. The Contractor shall implement a safety program that protects the lives and health of personnel in the construction area, prevents damage to property, and avoids work interruptions. To accomplish this end, the Contractor shall provide appropriate safety barricades, signs, signal lights, etc. as well as complying with the requirements of all Federal, State and Local safety laws, rules and regulations.

10. SITE RESTORATION & CLEAN UP: The work site shall be cleaned up at the completion of each workday. Contractor shall take special care to contain dust while working. Upon completion of the job, the Contractor shall clean up the job site, returning it to a state of cleanliness equal to or exceeding that in which it was found. The Contractor shall properly dispose of any trash, extra materials, dirt, debris, or other litter that remains. There will be no final acceptance of the contract until the Contracting Officer’s Representative approves the appearance of the job site.

11. GOVERNMENT FACILITIES AND REGULATIONS: The Contractor, their employees, and any sub-contractors shall become familiar with and obey all Base/ Unit regulations. All personnel employed on the project shall keep within the limits of the work area, and shall not enter any other area outside of the work site unless to do so in the performance of their duties. There shall be No Smoking in any Coast Guard Building.

12. CONTRACTING OFFICER’S REPRESENTATIVE: The Contracting Officer’s Representative (COR) will be designated at the notice to proceed.

Technical Requirements

1. General:

The contractor shall provide all supervision, labor, equipment, parts and materials necessary to remove TWO (2) existing water to air packaged heat pumps and install the replacement HVAC equipment, piping, electrical and related ductwork. The Contractor is to provide and install any and all parts necessary to fully install these HVAC system and to make fully functional. The existing heat pumps are horizontal type units that are located in the space above the suspended ceiling directly above the shop space that they serve.

· The Contractor shall properly recover refrigerant in accordance with all EPA regulations.

· The Contractor shall isolate, drain and refill the HVAC closed loop system as part of this project.

· The Contractor shall provide and install TWO (2) new packaged horizontal type water source heat pumps. Each unit shall be rated at FIVE (5) nominal ton refrigeration capacity. This equipment shall use refrigerant R410A, have cuper-nickel plated heat exchanger, factory insulated heat exchanger, phase loss protection, freeze stat, condensate overflow protection, one (1) inch water connections, thermostatic expansion valves, and be of the type to be installed on a closed loop system with extended temperature range.

· Contractors shall install this equipment in accordance with North Carolina Mechanical and Building codes as well as the equipment manufacturers’ requirements.

· The Contractor shall new insulated condensate piping with closed cell ½ inch minimum wall thickness insulation when located within the conditioned space. The Condensate piping shall be piped individually though the exterior building wall and terminate within 8 (eight) inches of the ground. The drain pipe shall extend out 6 inches from the exterior wall and terminate with a 45 degree fitting.

· The Contractor shall install a secondary galvanized steel drain pan under the new equipment with a minimum of 2 inch high sides with false edges and 6 inches wider and 6 inches longer than the equipment with a separate drain penetrating the exterior wall and extending 6 inches through the wall, and terminating with a 45 degree fitting. This pan shall be centered under the equipment.

· The Contractor shall suspend the equipment and secondary pan using corrosion resistant threaded rod and steel channel strut material, beneath the suspended ceiling, positioning the new equipment as close to the ceiling as practical.

· Contractor shall provide all electrical devices and qualified electricians to install the necessary electrical power and to re-route the existing electrical wiring to the new equipment locations, including the service electrical disconnect. The service electrical disconnect shall be re-located from above the ceiling (where they are now) to beneath the ceiling so that the switch can be readily accessible to the service technician.

· The Contractor shall be responsible to remove the existing equipment and materials from the Base.

· The Contractor shall be responsible for any wall openings necessary and sealing thereof.

· The Contractor shall install this equipment (2 each) to minimize system noise and vibration through the use of vibration eliminators.

· The Contractor shall provide and install an electronic programmable thermostat. Equipment system controls shall be 24 volts ac.

· The Contractor shall provide and install new brass full flow ball valves and flexible stainless steel hoses with test ports for the water connections from the existing building piping to the new equipment. The closed loop water piping shall be copper (Type L) hard drawn pipe. Full flow brass ball valves shall be located readily accessible to the new equipment to allow for service. The piping shall be properly installed with the appropriate support brackets.

· The Contractor shall insulate the closed loop piping system from the piping located in the ceiling to the new equipment with closed cell type such as “Rubatex” that has a ½ inch wall thickness.

· The Contractor shall provide and install insulated sheet metal fittings and duct as necessary to connect the two new heat pumps to the existing supply air ducts which are located above the suspended ceiling.

· The Contractor shall provide and install sheet metal return air plenums for each new unit, which are lined with acoustical insulation and sized to minimize noise.

· The Contractor shall take extra care and professionalism in the appearance and neatness of the equipment, electrical, piping, and ductwork, as this equipment will be visible within the conditioned space.

· The Contractor shall position the equipment so that all equipment access panels are fully accessible for routine maintenance and repair.

· The Contractor shall provide and install aluminum return air filter grilles with factory applied white paint finish. These grilles shall be properly sized in regards to air velocity to reduce noise and increase air filter efficiency.

· The Contractor shall provide and install equipment that is rated at 460 volt, three phase (460 volt/ 3 phase/ 60hz) with 24 volt control voltage. The Contractor shall provide and install the correct size and type circuit breaker as required by the equipment data plate.

· The Contractor shall provide all equipment and parts literature and OEM manuals to the COTR with all warranty information completed. The Contractor shall also install a label stating the warranty start date on equipment.

· The Contractor shall remove the existing suspended ceiling and related grid work to accomplish this project, including any lighting fixtures or other incidental items that may be required to be removed to accomplish this project. The Contractor shall reinstall the suspended ceiling system upon completion of the project.

2. Operational testing and start-up shall be conducted to verify proper operation of equipment.

3. Installation, operation, maintenance manuals and warranty information for the equipment and system components shall be turned over to the COR upon project completion. The COR and applicable Coast Guard personnel shall witness operational tests.

4. TESTING AND INSPECTION:

The Contractor shall notify the Contracting Officer’s Representative (COR) 5 days before the performance, inspection and acceptance tests are to be conducted. The tests shall be performed in the presence of the COR.

5. EXECUTION:

Installation, workmanship, fabrication, assembly, erection, examination, inspection and testing shall be in accordance with appropriate sections of 29 CFR 1910, 1926.

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