4120--Air Handler 3F AHU Coil Replacement

SCOPE OF WORK 1) The selected CONTRACTOR shall be responsible to provide all necessary project management, design services, materials, onsite supervision, and labor to perform Coil replacements as described herein. 2) The selected CONTRACTOR is required to provide meeting minutes and sign-in sheets for all meetings. The VA COR shall participate in all meetings between the CONTRACTOR/ and End-User that may impact the outcome of the project. The selected CONTRACTOR shall be responsible to record and provide meeting minutes to all meeting participants for review and approval/comment/rejection within 1 working day of each meeting. Any deviations or agreements not specifically requested and defined in writing with approval by the VA Contracting Team (including COR) prior to beginning work shall be invalid and will constitute a CONTRACTOR-initiated work stoppage until the matter is resolved. 3) The selected CONTRACTOR shall completely prepare site, coordinate with VA COR & end-users prior to beginning each phase of work to including design, demolition, construction, equipment de-installation & installation, etc. Remove and Replace steam heating coils and chilled water coils on AHU-3F located at the G.V. (Sonny) Montgomery VA Medical Center in Jackson, Miss. as described below. It shall be the Contractor s responsibility to provide all labor, supervision, materials, parts, accessories, and project management & coordination to complete the repair. Work shall be accomplished during normal business hours (7am-4pm, Monday through Friday, except holidays) to minimize government overtime. (The VA will approve overtime on an as-needed basis.) Contractor to provide new coils of copper tube-/aluminum fin construction with the same or better metal thicknesses and heat transfer capabilities as the existing coil designs. Contractor shall coordinate all work with the VA to avoid/minimize unnecessary downtime. Btu-hr. (heat transfer) capabilities are unknown at this time but shall be determined with and approved in writing by the VA COR prior to ordering. The Contractor is responsible to ensure that all work is done to the satisfaction of VA Maintenance Staff. The following coil dimensions are approximate to allow the Contractor to develop a firm, fixed-price, cost proposal for performance of the complete repair. Contractor to verify and determine precise dimensions, working pressures, and heat transfer capabilities. Coils shall be mounted on hot dipped galvanized steel supports to assure proper anchoring of coil and longevity and future maintenance. Coils shall be face- or side-removable for future replacement through the existing access doors, or removable panels. Each coil should be installed so that it is removable without disturbing adjacent coil. Cooling coils shall be designed and installed to avoid condensate carryover. Contractor is to Provide factory installed extended supply, return, drain, and vent piping connections. The period of performance for this project will be 45 calendar days. Contractor shall attend site visit before submitting proposal to Contracting Officer. Chilled Water Cooling Coils (8-Row, 5/8 diameter) (1-each)23-inches x 108-inches x 16-inches (1-each)48-inches x 108-inches x 16-inches Steam Heating Coils (1-1/8 diameter) (1-each)23-inches x 108-inches x 5-inches (1-each)48-inches x 108-inches x 5-inches steam trap size and type, adequate static leg for the gravity drain, and the recommended slope for the gravity return. (b) Hot Water Coils With Glycol: Select hot water or glycol preheat coils where the preheat coil surface comes in contact with 32 F [0 C], as defined above, or lower air temperature. Use propylene glycol solution with corrosion inhibitors specifically manufactured for HVAC applications. See Chapter 4 for glycol properties and design criteria. Hot Water Coils Without Glycol: Glycol can be omitted where the heating design temperature is above 32 F [0 C]. The following freeze protection measures are recommended: Provide a dedicated circulating pump in the coil circuit with hydronic separation between the coil circuit and the incoming hot water piping to maintain a constant water velocity of 3.0 fps [0.9 m/s] through the coil tubes.

Division 23 -

Heating, Ventilating, and Air Conditioning (HVAC), Instrumentation and Control for HVAC, HVAC Air Distribution, Central HVAC Equipment.