Attachment 1 - SOW.pdf

STATEMENT OF WORK (SOW). Install Ductless Splits, July 11, 2025.

OVERVIEW: There are three (3) LOCATION: The project site is located on Nellis Air Force Base (NAFB), which is situated approximately nine (9) miles north of downtown Las Vegas on Highway U.S. 93 (Las Vegas Blvd). NAFB is a United States Air Force installation with a rich history dating back to 1941. The base covers an area of approximately 11,300 acres and consists of three main areas: the Main Base, Area II, and Area III. The main base is the operational core of the installation and houses the flight line, command and control facilities, and support functions.

Area II is primarily used for housing and community services, while Area III is used for training exercises and weapons testing. The project site is on the Main Base at Building 585, which is the Air Force Joint Test Program Office, located at 5930 Delvin Dr., Nellis AFB, NV 89191.

OVERVIEW: There are three (3) Mitsubishi multi-zone split-type systems provide cooling to nine (9) secured office areas on the second floor at the east end of the facility. System #1 serves rooms 214A, and 214; system #2 serves rooms 202, 204, and 206; and system #3 serves rooms 201, 203, and 205. The units have served well beyond their expected service lives and have become uneconomical to maintain and repair. They have shown patterns of unreliability in comparison to the modern-day energy-efficient units on the market. The existing systems need to be replaced with new energy-efficient units. The new systems will provide critical cooling in the secured areas.

SCOPE OF WORK: The Air Force Joint Test Program Office has a requirement for the replacement of three (3) Mitsubishi multi-zone systems with three (3) Carrier horizontal suitcase-style multi-zone heat pump condensing units (CU) model number 37MGHAQ30EA3 with the associated wall-mounted fan coil units (FCU) model numbers 45MAHAQ09XA3, 45MAHAQ012XA3, and 45MAHAQ18XA3 at building 585 located on NAFB. The work covered by this SOW requires the contractor to provide a turnkey solution that includes the furnishing of all labor, materials, supervision, tools, equipment, incidental work, and professional design necessary to remove the existing equipment in its entirety (FCUs, CUs, refrigerant line sets, control wiring, condensate pumps and drain lines, thermostats, and electrical starting at the electrical panel to include breakers) and install new the Carrier HVAC systems. Ancillary work includes installation of new electrical from the existing MDP panel in the mechanical room, new control wiring in EMT conduits, thermostats installation, refrigerant line sets, condensate pumps with drain lines, and adding R-454B refrigerant. Each piece of equipment, associated parts, components and materials used on the project must be brand new, unless otherwise stated. The contractor shall provide and install the equipment and shall perform the startup of the installed equipment to ensure complete and functional systems. The equipment installation shall be per the manufacturer’s installation instructions. The new systems will comply with all local and national codes and regulations. The contractor shall adhere to the most current building codes, regulations, guidelines, and industry standards in the performance of this project. The contractor should also ensure that the installation of the new systems is safe, reliable, and efficient, and will be responsible for the successful installation, testing, and commissioning of the systems.

INSTALLATION REQUIREMENTS: Unless otherwise specified, all installation work for the new systems, including any required accessories such as ball valves and filter driers and controls, must comply with the manufacturer's instructions and recognized industry standards. The installation contractor must handle the equipment at the installation sites in accordance with the manufacturer's guidelines.

INSTALLATION INSTRUCTIONS/MANUALS: The installer must consult and follow the manufacturer’s installation manuals for each piece of equipment being installed and ensure that all supplied or field-installed components are included in the installation.

HEAT PUMP INSTALLATION: This project involves the installation of 2.5-ton outdoor heat pump units, specifically the Carrier model number 37MGHAQ30EA3. This model features a horizontal suitcase design suitable for multi-zone systems and operates at 208/230 volts with a single-phase 60 Hz frequency. It utilizes R-454B refrigerant, which is designed to be more environmentally friendly. The unit boasts an impressive cooling efficiency rating of up to 25 SEER2, making it an energy-efficient choice for temperature regulation. The contractor is tasked with ensuring that the outdoor units are installed correctly and securely onto the existing concrete pads. It is imperative to adhere to the manufacturer’s specified clearances to guarantee optimal airflow and efficiency. The installation shall include properly leveling the units and bolting them down using concrete anchors to ensure they remain stable in various weather conditions. Non-compliance with these guidelines may lead to damage to the units or a decrease in their operational efficiency. Therefore, following the manufacturer’s detailed installation instructions is crucial for ensuring longevity and peak performance.

INSTALLATION OF FAN COIL UNITS (FCUs): The selected FCUs for this project are the Carrier wall-mounted models designated as 45MAHAQ09XA3, 45MAHAQ12XA3, and 45MAHAQ18. These units also operate at 208/230 volts with single-phase 60 Hz frequency. For System #1, the installation will consist of one (1) FCU m/n 45MAHAQ09XA3 in room 214A, along with two (2) other models, 45MAHAQ12XA3 and 45MAHAQ18, installed in room 214.

For System #2, the contractor shall install three (3) ¾-ton FCUs, specifically m/n 45MAHAQ09XA3, in designated rooms 202, 204, and 206. For System #3, three (3) units of the same model will be installed in rooms 201, 203, and 205. The contractor must confirm that the new refrigerant lines in each numbered room are associated with the correct outdoor units. At the FCUs, the refrigerant lines shall be surface-mounted and installed with a 90-degree angle into the units. This configuration is intended to facilitate the proper installation of line set covers, ensuring a clean and aesthetically pleasing appearance. All work must comply with applicable building codes, manufacturer specifications, and best practices for refrigerant piping installations.

CONDENSATE LINES: The condensate lines attached to the installed condensate pumps must be carefully routed to the exterior of the building. They should be integrated into the refrigerant line set covers so that they terminate neatly at the outdoor units, preventing leaks or blockages.

INSULATED LINE SETS: The contractor holds the responsibility of providing and installing all new insulated refrigerant line sets that serve as the conduits connecting the indoor FCUs to the outdoor heat pump CUs. When passing refrigerant tubing through the wall, avoid contact between the tubing and the wall to prevent damage to the tube, insulation, condensate drain hose, and wiring and to eliminate outdoor air and water leaks into the conditioned spaces.

During this installation, it is paramount to avoid any sharp bends in the refrigerant tubing.

Unintended bends can restrict refrigerant flow, which may diminish the overall efficiency of the system. The contractor is required to properly secure and support these line sets to the hard ceiling above using approved hanging supports, taking care not to interfere with or damage the fiber optic cabling. The contractor shall be held liable for any damages done to the fiber optic cabling.

The contractor must use appropriate hardware such as pipe hangers or brackets, specifically crafted from metal, that can support the weight of refrigerant lines. Refrigerant piping shall be suspended using engineered hanging supports designed for HVAC applications. Direct suspension using rigid wire or uninsulated metal straps is strictly prohibited due to the risk of mechanical wear and thermal bridging. When hanger straps are utilized, they must be sized to accommodate both the tubing and insulation, conforming to the insulation’s outer diameter to prevent compression and maintain thermal integrity. Metal sleeves must be bent to match insulation contours when isolating the tubing from hanger straps. Supports shall be installed at regular intervals as per industry standards and manufacturer recommendations to prevent sagging, ensure stability, and maintain proper clearance. The chosen support system must be rated for the load and must not compromise the integrity of the ceiling system. New piping at the CUs shall be installed ensuring proper alignment and secure connections, and in a neat and organized manner to accommodate the installation of insulation rated for outdoor use. Once insulated, the refrigerant lines shall be enclosed with metal embossed cladding for durability and protection.

LINESET COVERS: Prior to installing new line set covers, the contractor shall seal all penetrations and openings where refrigerant line sets, electrical conduits, and condensate drains exit the facility. Sealing shall be performed using RTV or an approved pliable, silicon-based caulk rated for exterior use. The contractor shall install fabricated metal covers on the exterior of the facility to fully enclose and protect all exposed line sets, conduits, and drains.

The covers must be securely fastened and weather-resistant. Upon installation, all metal covers shall be painted to match and blend seamlessly with the facility’s existing exterior finish. The selected paint color must comply with the NAFB standard exterior paint color scheme.

LEAK TESTING AND INSPECTION: The contractor shall perform an inspection of the refrigerant lines, connections, and fittings for any signs of damage, leaks, or improper installation.

Pressure testing on the pipe connections both at the FCUs and CUs must be carried out meticulously to ensure tightness and identify any possible leaks. Pressurize the system through the gauge port with dry nitrogen. Perform a leak test using a refrigerant leak detector or a soap solution to ensure that all field joints are leak-free and there are no leaks in the system. If leaks are detected, release the pressure, repair the issue, and repeat the leak test. Upon completion, the contractor must deliver a warranty that guarantees the entire system installation will remain leak-free for a period of one (1) year. Adherence to all outlined specifications, along with the execution of high-quality installations that comply with applicable industry standards and local building codes, is crucial for the project's success and reliability.

EVACUATION AND DEHYDRATION: After the leak check is completed, Use a vacuum pump to evacuate the refrigerant lines, indoor units, and outdoor units to remove any air, moisture, and contaminants. Evacuate the system to maintain a vacuum of 500 microns or lower. If the gauge pressure rises above 500 microns within one minute, this indicates that evacuation is incomplete or that the system has a leak. Conversely, if the vacuum gauge does not rise above 500 microns in 10 minutes, the evacuation is considered complete.

REFRIGERANT CHARGING: It is mandatory for the contractor to use virgin R-454B refrigerant to charge the systems. Utilizing new refrigerant is crucial, as it guarantees optimal performance and efficiency in accordance with the manufacturer's guidelines. This requirement is important not only for compliance but also for ensuring that the systems deliver the desired conditioned air effectively and operate at their maximum capacity. Any deviation from this standard could result in decreased efficiency and potential problems with the system's operation.

Additionally, the contractor must guarantee that the systems will remain leak-free for one (1) year following installation.

HEAT PUMP CU ELECTRICAL: The 2.5-ton heat pump outdoor CU mandates a very specific power supply configuration of 208/230 volts, single-phase, 60 Hz, to function correctly and effectively. According to the electrical specifications, the Minimum Circuit Ampacity (MCA) required is 37 amps, and the Maximum Overcurrent Protection (MOCP) should be set at 40 amps.

The contractor is responsible for verifying the power requirements of the outdoor units.

These specifications are critical for ensuring safe and reliable operation of the system. To comply with these needs, at Main Distribution Panel MDP-B 585, the contractor shall install a new 125-amp, 3-phase circuit breaker to serve a new subpanel. A new 125-amp, 3-phase subpanel shall be installed, complete with all associated breakers, conduit, wiring, and disconnects necessary to support the electrical requirements of three (3) new heat pump units. The contractor shall remove (demo) all existing electrical conduits and wiring associated with the three (3) existing heat pumps. However, the existing breakers in Panel 5 should be left in place and clearly labeled as spare or inactive, as appropriate. The contractor should update the panel directory for MDP-B 585 and all affected panels to accurately reflect the changes.

Additionally, new convenience outlets shall be installed—one for each heat pump unit— sourced from the new subpanel. These outlets should be mounted in accessible locations as approved by the project representative. All electrical panels, subpanels, breakers, and disconnects shall be clearly and permanently labeled in accordance with the Installation Facility Standard (IFS) requirements. Control wiring must be securely routed through EMT conduit to connect the CUs with the FCUs, providing both protection and organization of the wiring. The contractor will be responsible for sourcing and installing all required EMT and LiquidTite conduits, as well as the necessary conduit straps, electrical wires, and mounting accessories, ensuring that the installation is complete, professional, and meets all regulatory standards. All electrical connections made during the installation process must adhere to the National Electric Code (NEC), Unified Facilities Criteria (UFC), as well as any applicable local codes or ordinances. Such adherence is essential for maintaining the overall safety of the installation, ensuring compliance with legal requirements, and enabling the efficient operation of the entire HVAC systems.

INSTALLATION OF THERMOSTATS: The contractor shall provide and install a Carrier wired remote 7-day programmable controller, designated by model number KSACN0401AAA, in a carefully selected and optimal location within each conditioned space. This location must be easily accessible to users, allowing for convenient adjustments while ensuring accurate temperature readings. To facilitate a professional and neat installation, the contractor will run new thermostat control wiring inside EMT conduit, establishing connections between the heat pump CUs and the thermostats in each space. All wiring must be meticulously organized, securely fastened, and designed to avoid any interference with other wiring or components of the HVAC system. Upon the completion of the installation, the contractor is responsible for conducting a comprehensive functionality check on each thermostat to confirm proper operation. This check should include testing for accurate temperature readings, ensuring responsiveness to user adjustments, and confirming seamless connectivity with the heat pump CUs. Additionally, the contractor is responsible for programming the new thermostats in a manner that optimizes performance and enhances energy efficiency. The programming must align with the desired cooling settings specified by the occupants, allowing for the most comfortable environment while maximizing energy savings. After the programming is complete, the thermostats should be placed in child lock mode to prevent unauthorized adjustments and ensure consistent operation. This attention to detail will help maintain the integrity and efficiency of the HVAC system throughout its use.

EQUIPMENT LABELS: The contractor must provide and install permanent labels on each safety disconnect switch, clearly identifying the corresponding electrical panel and breaker supplying power to the installed units. These labels should be durable and resistant to wear. Machine-engraved, laminated Bakelite nameplate-type labels must be permanently mounted to withstand the operational environment. The labels should feature a high-contrast design, utilizing black backgrounds with white letters for optimal visibility. HVAC equipment disconnect switches should have lettering that is ¼ inch or larger, ensuring clarity and readability. The first line of the label should display the name of the equipment in use, while the second line should specify the electrical panel and breaker supplying power. It is essential that the contractor does not use handwritten, self-laminating, or embossed plastic labels, as these do not meet the specified standards for permanence and professionalism.

SYSTEM START UP: The contractor shall conduct a thorough start-up process for the newly installed units, which includes balancing the refrigerant charge to ensure optimal performance. A detailed inspection of the mounting installations for both the indoor and outdoor units must be carried out. This inspection should cover all aspects, including the integrity of conduit runs, correct installation of anchors, brackets, and supports, as well as the functionality of all electrical components. The contractor will verify that the new HVAC systems operate efficiently in both cooling and heating modes, performing tests to assess their operational performance. This includes confirming that the supply voltages are within the specified range and ensuring that the thermostats function as intended, accurately responding to temperature changes and commands. Additionally, the contractor must thoroughly review the installation of all electrical components to ensure they comply with safety and functionality standards and confirm that the units operate according to the established specifications. Any identified discrepancies or issues must be addressed promptly. The systems must be fully operational and compliant with all relevant codes and regulations.

GENERAL ELECTRICAL: It is essential to ensure that all electrical work is performed by licensed electricians who have the expertise to complete the tasks safely and efficiently. The contractor is responsible for providing and installing new safety disconnect switches, conduits, wiring, and fittings for all electrical connections, ensuring that the system is modernized and safe for use. All new wiring must comply with the National Electrical Code (NEC), which outlines the standards for electrical systems' installation and maintenance. To ensure the safety of the electrical system, all connections must adhere to both the NEC code and the manufacturer's specifications.

Proper electrical mounting hardware must be utilized to support all electrical conduits, and all installed wire must meet the standards set by the National Board of Fire Underwriters. The wire must be of the appropriate size to prevent overheating and to ensure efficient system operation.

All wire must carry the Underwriters' Laboratory label, signifying that it has been tested and meets safety standards. Additionally, all power wiring conductors must be of copper type THWN or THHN, materials known for their durability and resistance to wear. Following these guidelines is crucial to ensure that all electrical work is completed accurately and safely. Adhering to these standards minimizes the risk of electrical hazards and prolongs the system's lifespan.

WORK ON ENERGIZED CIRCUITS: This project involves working with electrical circuits;

therefore, all contractors working near or on any electrical circuit must comply with UFC 03-560- 1 (Electrical Safety, O&M) regulations. Contractors are required to wear appropriate Personal Protective Equipment (PPE) when working near energized lines. Additionally, it is strictly prohibited to perform any work on energized lines, as stated in Chapter 8, Section 8-1 of UFC 03- 560-1. If work needs to be conducted on or around energized circuits, the contractor must coordinate the scheduling of a power outage with 99 CES Operations Flight Customer Service Section. To facilitate smooth coordination, the contractor is required to submit an AF Form 103, a work clearance form, through the 99 CES Customer Service. Please note that all power outage requests MUST be submitted four (4) weeks prior to the planned outage. We take electrical safety very seriously and urge all contractors to follow the UFC 03-560-1 regulations to ensure a safe working environment.

SAFETY: All contractors must possess and utilize the necessary tools, equipment, and PPE to ensure that tasks are carried out safely, effectively, and within the designated timeframe. These tools, equipment, and PPE must comply with the requirements of OSHA Standard 29 CFR 1910, Subpart I, and NFPA 70E. Please note that failure to comply with these requirements may result in job stoppage.

FIRE PREVENTION AND PROTECTION: According to contractual obligations, the contractor must strictly adhere to base fire regulations designed to ensure the safety of individuals and property. It is crucial that the contractor becomes thoroughly familiar with the fire safety requirements applicable to this project. This includes obtaining a burning permit from the 99 CES Fire Protection Flight before any burning activities are authorized at NAFB. The contractor must follow all the burning requirements outlined in the permit and ensure that the permit is always posted at the project site. The burning permit can be obtained from the Fire Protection Flight, located at building 277, 4167 Tyndall Ave NAFB (702-652-9630). Compliance with all burning requirements is mandatory, as non-compliance can lead to severe consequences. The contractor must ensure that they have the necessary equipment and personnel to carry out any burning activity safely. By adhering to burning regulations and obtaining the necessary permit, the contractor helps ensure the safety of individuals, real property, and the environment at NAFB.

ENVIRONMENTAL PROTECTION: All work and contractor operations must comply with applicable federal, state, local, and NAFB laws, regulations, codes, and permits related to environmental protection. This includes adherence to the NAFB Management Plan. The contractor must ensure that their work activities are conducted in a manner that does not harm the environment. If necessary, the representative of 99 CES may order tests for Asbestos-Containing Material (ACM) and Lead-Based Paint (LBP) in the work area. This is to ensure the contractor is aware of any hazardous materials that could pose a risk to health or the environment. If any area tests positive for asbestos or lead-based paint, 99 CES will be responsible for abating the area before the contractor can begin the project. This means that 99 CES will take all necessary actions to remove or contain the hazardous materials before the contractor starts any work. It is crucial that all parties involved in the project follow these regulations to protect the environment and maintain safety.

CHARACTER OF WORKERS: The contractor is expected to perform their duties with the utmost care, ensuring that skilled and qualified mechanics carry out the work. The contractor must strictly adhere to the SOW and industry standards to ensure satisfactory completion. For installing and supervising mechanical and electrical systems, only certified journeymen in their respective trades or apprentices under the direct supervision of certified journeymen may be employed. To verify their certification, the representative of 99 CES will accept current state or municipal certifications issued to the journeymen. The certification must be valid and up to date to ensure that the work is performed by qualified professionals with the necessary skills and knowledge.

Adherence to these guidelines will ensure that the work is completed to a high standard, in compliance with all regulations and that safety is maintained for all involved.

CONTRACTOR’S RESPONSIBILITY: The contractor assigned to this project must take full responsibility for ensuring that all services provided under this SOW are of the highest professional quality, technically accurate, and well-coordinated. All equipment and materials used for the project must be new. The contractor must procure necessary equipment and materials from reputable suppliers and ensure they meet project requirements. The contractor is also responsible for transporting and safeguarding all equipment and materials required for the project.

WORKING HOURS: The standard working hours are from 7:00 a.m. to 4:00 p.m., applicable on regular business days from Monday to Friday. These hours do not include federal holidays or the day after Thanksgiving. Please plan accordingly and adjust your work schedule as necessary to adhere to the standard working hours.

CLEAN UP: The contractor is required to always maintain a clean and safe work area, including any storage areas they use. This means ensuring there is no unnecessary accumulation of waste materials or trash in the work area. Any materials or trash that do not belong to the government must be removed by the contractor prior to completion of the work. Upon finishing, the contractor must leave the job site in a clean, neat, and professional condition by removing any tools, equipment, or trash that may have accumulated during the work.

QUALITY ASSURANCE: According to the terms of the SOW, the government has designated a representative, identified as 99 CES, to periodically assess and evaluate the contractor's performance. This evaluation will be based on the specific performance requirements outlined in the SOW and will help determine whether the contractor is meeting their obligations and delivering the agreed-upon products or services. The government will use the results of these evaluations to make informed decisions regarding the project, including the potential need to pause the project or take corrective actions.

DELIVERABLES: The contractor is responsible for conducting a thorough pre-operational check on all installed equipment. It is essential that the equipment is inspected and verified to be in good working order before use. To ensure customer satisfaction, the installed equipment and all workmanship are covered by a one-year parts and labor warranty. During this period, if any defects arise, the contractor will promptly repair them, including any damage incurred to the NAFB property due to such defects. The contractor will make all necessary repairs as soon as possible to minimize any inconvenience to the customer. Upon project completion, the contractor is required to provide the customer with all manufacturer's written warranties. This will allow the customer to access and utilize these warranties as needed. The contractor must also register all equipment as mandated by the manufacturer to activate the warranty and include copies of these registrations in the closeout documents delivered to the customer. All warranties will be incorporated into the close-out documents, which will be provided at the end of the project.

CLOSEOUT DOCUMENTS: Upon completion of the project, the contractor must deliver the equipment document packages to the 99 CES point of contact. Additionally, completed manufacturer's warranty cards and warranty letters from the installation contractor must be included in this package.

GENERAL CONDITIONS: All work performed must comply fully with industry standards and the manufacturer's recommendations. All electrical wiring, connections, and structural designs must be installed in strict accordance with the latest version of the NFPA 70 National Electric Code (NEC), Uniform Mechanical Code, and NFPA 54, ASME CSD-1 (Controls & Safety Devices) to ensure proper safety and functionality. All design and construction must adhere to the International Building Code (IBC) 2009 Edition, DoD Unified Facilities Criteria Standards (UFC), Unified Plumbing Code (UPC), and all accepted industry practices. The quality of workmanship must meet the highest standards, reflecting the capabilities of the journeymen involved in the required trades to complete the service. Upon completion of the project, the system must be 100% operational, ensuring that all systems and components work correctly and function as intended.