HVAC SOW.pdf

Facilities Engineering Department

Scope of Work and Specifications for

Building 49 Flight Offices HVAC Replacement Project

Located at

U.S. Coast Guard Base Elizabeth City, N.C.

May 2023

Commanding Officer United States Coast Guard

Base Elizabeth City

Elizabeth City, NC 27909

1) SCOPE: The Contractor shall provide all supervision, labor, equipment, parts and materials to remove an existing 5 ton air handler, condensing unit and install a

3.5 ton (42,000 BTU’s nominal) split type air to air heat pump equipment including metal supply duct to connect the new air handler to the existing supply air branch ducts, return air grilles, auxiliary electrical strip heat, new insulated refrigerant piping, control wiring and thermostat. This work is located at the USCG Base Elizabeth City, NC in building 49, (Air Station).

2) GOVERNMENT FACILITIES AND UTILITIES:

a. 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.

b. Telephone services will not be available for use by the contractor.

c. Building restroom facilities are not available for use. The Contractor shall provide portable restroom facilities for use by their employees.

3) 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 45 calendar days from acceptance of submittals. The Contractor shall perform all work during normal base work hours. The base normal working hours are 7:00 am to 4:00 pm, Monday through Friday. If the contractor would like to work outside normal working hours, permission must be obtained from the COR.

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

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 Service Contract 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 (COR) 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. All smoking must be done in the designated smoking area.

12) CONTRACT TIMELINE: The Contractor shall provide all required information and complete this contract within this time schedule, unless approved by the Contracting Officer.

a. Provide all required submittals to the Contracting Officer within 10 calendar days after contract award.

b. The U.S. Coast Guard will have 7 calendar days to review the submittals and respond to Contractor.

c. Contractor shall provide projected delivery schedule during proposal and provide a firm delivery date within 7 calendar days after the contract has been awarded.

d. The Contractor, upon receiving notification that the U.S. Coast Guard has approved the submittals and having received the Contractors firm delivery date schedule, will have 10 Calendar days to begin work on the project and have the project completed within 35 calendar days. The Contractor shall notify the Contracting Officer of any long lead time delivery of equipment, so that the Contracting Officer can modify the delivery date of the contract.

13) SUBMITTALS:

a. Once awarded, the following list of submittals required for approval defines the specific minimum requirements for this contract. The submittal shall contain sufficient information that can be used to determine compliance of the material with these specifications and referenced specifications.

i) Air handler Unit

ii) Heat pump Unit

iii) Electric strip heat

iv) Duct system drawing

v) Work delivery schedule

14) REFERENCES:

a. Photos of existing equipment

b. Drawings of work areas

15) TECHNICAL REQUIREMENTS:

General: Provide all supervision, labor, equipment, parts, and materials necessary to remove the existing HVAC equipment (air handler, and Outdoor condensing unit), provide and install the new HVAC equipment. The Contractor is to provide and install all parts necessary to fully install this HVAC equipment and make fully functional IAW manufacture specifications and the below specifications:

A. The Contractor shall remove the existing condensing unit, piping, air handler and any necessary duct and any suspended ceiling tiles and grid to gain working space. The existing air handler is in the overhead attic space of an office. The new air handler will be installed in the same overhead space. The new air handler shall be installed approximately 6 inches above the ceiling grid, and closer to the center of the office space to allow for better maintenance access.

B. The Contractor shall install insulated metal duct from the new air handler supply to the existing metal duct in the overhead attic space. The Contractor shall install a return air plenum that is insulated and lined. The return air plenum shall be fabricated so the branch return air ducts can be attached to the plenum above the ceiling.

C. The Contractor shall provide one (1) new 3.5 ton air to air split type heat pump outdoor unit and air handler that is 208/230 volts, single (1) phase, with 5 KW, 208/230 volts, single phase, and electrical supplemental heat. This equipment shall use R-410A refrigerant. The air handler and electric strip heat shall be a single point connection.

i. Contractors shall install this equipment in accordance with North Carolina Mechanical Code, National Electrical Code (NEC), and applicable Building codes as well as the equipment manufacturer recommendations or requirements.

ii. Contractor shall provide and install a new thermostat in the same location as the existing and new control wiring from the thermostat to the equipment. Control cable wiring shall be in liquid tight conduit to the outdoor unit from the air handler.

iii. The contractor shall provide and attach an Ultraviolet protected adhesive label to each piece of equipment. The label shall state the model and serial number, service start date and warranty end date of the installation.

iv. The Contractor shall install a duct type smoke detector. Final connection to fire alarm system will be provided by the US Coast Guard.

v. The Contractor shall provide and install minimum 26-gauge sheet metal trunk duct with cross brakes on all sides or round metal duct with insulated flexible connectors at the unit supply and return connections.

vi. The Contractor shall modify the new air handler with duct transitions to connect the new air handler to the existing supply and return air branch ducting to allow for relocation of the new air handler. The Contractor shall be responsible for sizing and replacement of any duct that is not properly sized. No supply air branch duct shall connect to the supply trunk duct within 18 inches of the end cap.

vii. The Contractor shall professionally seal the refrigerant piping at the roof penetration using the proper sealing materials approved for such application.

viii. All sheet metal joints or connections shall be sealed with mastic to prevent supply air loss or unconditioned return air infiltration.

ix. Duct wrap insulation for the Supply duct shall be foiled faced type and insulation rated as R-8. Mastic shall be applied to all taped areas of this duct wrap insulation.

x. The return air plenum shall be lined with approved duct liner to reduce air noise. This duct liner must be attached by adhesive and mechanically fastened.

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

xii. The Contractor shall place the new condensing equipment on the existing roof mounted steel support frame that is currently supporting the existing failed equipment. The equipment shall be secured to the support frame with threaded fasteners.

xiii. The entire length of the condensate drain shall be insulated with closed cell tubing insulation to prevent sweating.

xiv. The condensate drain shall have an integrated overflow switch in the condensate trap.

xv. The refrigerant piping for this system shall be copper and fully supported.

xvi. The contractor shall provide and install a support system for the air handler using threaded rods and galvanized channel strut materials, capable of supporting the weight of the air handler unit with adequate space to connect the return air plenum.

xvii. The Contractor shall provide and place a galvanized sheet metal water tight pan beneath the air handler. This backup pan shall be 6 inches wider and 6 inches longer than the air handler with 2 inch high sides and to include a ¾ inch drain to the outside of the building structure. This pan shall be positioned and fully supported directly under the air handler.

xviii. The outdoor heat pump shall be equipped with low ambient temperature controls for mild weather cooling operation.

xix. The outdoor heat pump unit shall be equipped with current and voltage protection.

xx. The outdoor heat pump unit shall have louvered panel type hail guards to protect the outdoor coils from damage.

xxi. The Contractor shall make all electrical connections to this new equipment from the electrical disconnects to the equipment.

xxii. The USCG Facilities Engineering Electrical Shop personnel will provide and install the electrical circuit and electrical disconnect switch to the new air handler location.

xxiii. The existing suspended ceiling is 2 feet by 2 feet grid system. The Contractor shall remove and re-install the ceiling tiles and grid ceiling system for this project.

xxiv. The Contractor shall provide and install ½ inch closed cell insulation on the refrigerant piping. The refrigerant piping located on the roof shall be insulated and covered with a UV light insulation protection system.

xxv. The Contractor shall provide the Crane and rigger and all personnel to remove the existing rooftop equipment and the placement of the new equipment.

xxvi. The Contractor shall be responsible for disposing of all removed equipment and materials off-site from the Base.

xxvii. The existing steam coil piping at the existing air handler shall be valved closed and capped/plugged with steel fittings.

D. Original Equipment Manufacturer Operational testing and start-up shall be conducted to verify proper operation of equipment and commissioning.

E. Installation, operation, maintenance manuals and warranty information for the equipment and system components shall be turned over to the COR upon project completion. The Contractor shall complete and submit or register any and all manufacturer warranty information and provide these documents to the COR.

The Contractor shall provide a one year warranty on the equipment (including labor) from the startup date of the equipment for any problems that might occur with the new installation.

16) TESTING AND INSPECTION:

a. 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.

b. Installation, workmanship, fabrication, assembly, erection, examination, inspection and testing shall be in accordance with appropriate sections of

29 CFR 1910, 1926.

REFERENCES: Photos

Figure 1: Existing Failed condensing unit

REFERENCES: Photos

Figure 2: Existing Refrigerant Piping Roof Penetration

REFERENCE: DRAWING

Figure 3: Existing HVAC Mechanical Drawing