Repair Bldg 303 Chiller SOW w_ Option at Bldg 240.pdf

STATEMENT OF WORK

March 2, 2022

Repair Chiller

At Building 303 and 240 Project LRXQ222501

MISSISSIPPI AIR NATIONAL GUARD

172nd Airlift Wing Jackson, MS

BASE BID: Remove and Replace the 20 ton Chiller at Building 303.

• [Option_1] Remove and Replace the 70 ton Chiller at Building 240.

I. GENERAL SYNOPSIS

A. The Contractor shall provide all labor, materials, supervision, equipment, methods and devices necessary to remove the existing chiller and replace with a proposed chiller that is efficient to the current conditions of the facility. Prior to removing the existing chiller, the contractor is responsible for adequately removing the existing refrigerant inside of the chiller. Before the contractor begins removing the existing refrigerant, they must contact the 172nd Civil Engineering Unit so that we can properly weigh the EMPTY recovery tanks as well as the refrigerant once it is released in the recovery tanks and logged accordingly in APIMS. The contractor will then be liable of disposing the refrigerant as stated by OSHA and EPA regulations.

Once all refrigerant have been removed, the contractor will utilize their equipment to remove the existing chiller from the site and place on the trailer provided by the 172nd Civil Engineering Unit. The 172nd Civil Engineering Unit will be responsible for hauling away the existing chiller. The contractor will continue to install the proposed chiller and position all proposed equipment in a layout that will provide the minimum spacing required to perform maintenance according to the factory standards. It is the Contractor’s responsibility to verify that the proposed chiller is sized accordingly to fit on the existing 8’x10’ concrete slab. The contractor is also liable for any necessary additions or modifications to the concrete slab. The contractor is responsible for all incidentals and damaged equipment and materials during the installation of the proposed chiller.

B. [Option _1] Entails the same procedures and responsibilities between the Contractor and the 172nd Civil Engineering Unit as stated above. However, the existing chiller at Building 240 is positioned between the facility and a pavilion on a 8’x17’ concrete slab. The contractor will be responsible for positioning all proposed equipment in a layout that will provide the minimum spacing required to perform maintenance according to the factory standards. This includes spacing next to the pavilion as well as the facility itself. The contractor is also liable for any necessary additions or modifications to the concrete slab. The contractor is responsible for all incidentals and damaged equipment and materials during the installation of the proposed chiller.

II. LOCATION: MS ANG 172d Airlift Wing, Thompson Field

141 Military Drive, Bldg 303 & Bldg 240 Flowood, MS 39232

III. PERIOD OF PERFORMANCE: 180 Days from date of the Notice to Proceed

IV. ACCESS HOURS: 07:30 – 16:00 Tuesday thru Friday and 07:30 – 15:00 every other Monday, with the exclusion of holidays or inclement weather

V. TOUR OF JOB SITE:

Site Visit will be offered and is recommended to familiarize the contractor with existing features that will affect the work. Contractor is responsible for and shall verify all dimensions; determine all quantities of materials and devices necessary to accomplish the work in accordance with the intent of this statement of work. Field measurements and observations are the full responsibility of the contractor. Failure of the contractor to perform such a visit shall not relieve him from furnishing all labor, materials, equipment and devices necessary to complete the work or from making changes necessitated by site conditions. Submittal of proposal will serve as prima facie evidence that the contractor has taken into account site conditions.

VI. GENERAL UNIT DESCRIPTION

A. Factory assembled, single-piece chassis, air-cooled liquid chiller. Contained within the package shall be all factory wiring, piping, controls, and refrigerant charge (HFC- 410A or R-134a).

B. Actual tonnage and SEER shall be equal to or exceed that scheduled on the drawings, when chiller is operating at scheduled full load conditions with the percentage of glycol to provide the freeze protection indicated on the schedule. If the electrical rating of the furnished chiller exceeds that of the scheduled chiller, the chiller manufacturer shall bear the cost of increasing the size of the electrical service to the chiller.

VII. CABINET

A. Frame shall be heavy-gage, with powder coated paint finish for both aesthetic appeal and to offer more resistance to corrosion.

B. Units shall be constructed of a galvanized steel frame with galvanized steel panels and access doors. Component surfaces shall be finished with a powder-coated paint.

The coating or paint system shall withstand a 1000-consecutive-hour salt spray application in accordance with standard ASTMB117.

C. Provide factory installed Architectural Louvered Panels completely covering all condenser coils and compressor section. It shall be the responsibility of the Contractor to ascertain if the substitute items will fit into the space allotted as conveniently as the items specified. Any changes to the building or system design necessary shall be arranged for in writing before material is ordered. All costs involved in making such changes shall be borne by the Contractor.

VIII. COMPRESSORS

A. Fully hermetic scroll type compressors with R410A optimized and dedicated scroll profile. Screw compressors with R-134a refrigerant may also be used.

B. Direct drive motor cooled by suction gas with only three major moving parts and a completely enclosed compression chamber which leads to increased efficiency.

C. Each compressor will have crankcase heaters installed and properly sized to minimize the amount of liquid refrigerant present in the oil sump during off cycles.

IX. EVAPORATOR

A. The evaporator shall be a high efficiency, brazed plate-to-plate type heat exchanger consisting of parallel plates. Braze plates shall be stainless steel with copper braze material.

B. The evaporator shall be protected with an etched foil heater and insulated with 3/4 inch insulation. This combination shall provide freeze protection down to -20F ambient temperatures while the heater is powered. Contractor shall provide separate power to energize heater and protect evaporator while chiller is disconnected.

C. The water side working pressure shall be rated at 150 psig and tested at 1.5 times maximum allowable water side working pressure.

D. The refrigerant side working pressure shall be rated at 460 psig (29.6 bars) and tested at 1.1 maximum allowable refrigerant side working pressure

X. CONDENSER

A. The condenser coils shall consist of copper tubes mechanically bonded into plate-type aluminum fins. A sub cooling coil shall be an integral part of the main condenser coil.

B. The maximum allowable working pressure of the condenser shall be 650 psig (44.8 bars). The condensers shall be factory proof and leak tested at 715 psig (49.3 bars).

C. Low Sound Fans shall be dynamically and statically balanced, direct drive, corrosion resistant glass fiber reinforced composite blades molded into a low noise fan blade.

D. Low speed fan motors shall be three-phase with permanently lubricated ball bearings and individually protected by circuit breakers.

E. Unit shall be capable of starting and running at outdoor ambient temperatures from

0F to 125F for all sizes.

XI. ENCLOSURES

A. Mount starters in a UL1995 rated panel for outdoor use.

B. The starter shall be across-the-line configuration, factory-mounted and fully pre-wired to the compressor motor(s) and control panel.

C. A control power transformer shall be factory-installed and factory-wired to provide unit control power.

D. Control panel shall be dead front construction for enhanced service technician safety.

E. Power line connection type shall be standard with a terminal block.

XII. REFRIGERATION COMPONENTS

A. Each refrigerant circuit shall include a filter drier, electronic expansion valve with site glass, liquid line service valves and a complete operating charge of both refrigerant and compressor oil.

B. Each refrigerant circuit shall include a discharge line service valve to allow the refrigerant to be isolated in the condenser.

XIII. CONTROLS, SAFETIES AND DIAGNOSTICS

A. The microprocessor-based unit controller shall be factory-installed and factory-tested.

B. The unit display shall provide the following data:

C. The unit controller shall provide chilled water reset based on return water as an energy saving option.

1. Water and air temperatures

2. Refrigerant levels and temperatures D. The unit shall shut down if one or more of the following safeties has been breached;

1. Low evaporator refrigerant temperature and/or pressure

2. High condenser refrigerant pressure

3. Low oil flow

4. Motor current overload

5. High compressor discharge temperature

6. Electronic distribution faults: phase loss, phase imbalance, or phase reversal

E. Unit shall be shipped with factory control and power wiring installed.

F. Provide factory installed BACnet MS/TP interface card.

XIV. CHILLED FLUID CIRCUIT

A. Chilled fluid circuit shall be rated for 150 psig (1034 kPa) working pressure.

B. Proof of flow switch shall be provided by the equipment manufacturer and installed the correct number of pipe diameters from any elbow and in the correct orientation.

C. Evaporator shall have factory installed water strainer that is factory provided. It shall be installed with a blowdown valve to facilitate periodic cleaning of the strainer to prevent it from becoming clogged.

XV. CHILL WATER PUMPS

A. Chill water pumps should be replaced with high efficiency pump and motor assembly.

B. Reconnect chiller pipes to make sure proper flow is present.

C. Chiller models that have pumps built into the chiller system may also be used.

D. Supply controls so that pump status can be seen from the DDC system at building 303.

XVI. STARTUP AND FINAL INSPECTION.

A. Startup is to be performed by factory trained and authorized servicing technicians confirming equipment has been correctly installed and passes specification checklist prior to equipment becoming operational and covered under OEM warranty. All DDC controls need to be connected to the Siemens work station in building 303.

B. All scrap metal is to be placed in the 172AW recycle dumpster. Removed chiller unit will be turned over to 172nd for recycling purposes; contractor is responsible to move unit to location (on base) as directed by contract COR. 172nd will provide the truck to move the retired unit. All other trash will be disposed of off base by the contractor.

Contractor shall protect government property from dust and debris during the completion of the project. At the completion of the job, the project site must be returned to previous conditions and cleaned to the satisfaction of the Contracting Officer/COR.

XVII. SECURITY AND BASE ACCESS

A. Access and General Protection/Security Policy and Procedures. This standard language is for contractor employees with an area of performance within Government controlled installation, facility, or area. The contractor shall comply with all applicable installation/facility access and local security policies and procedures, which may be obtained from the Contracting Officer’s Representative (COR). The contractor shall also provide all information required for background checks to meet installation access requirements to be accomplished by the local installation’s Security Forces, Director of Emergency Services or local Security Office. The contractor shall ensure compliance with all personal identity verification requirements as directed by DoD, HAF and/or local policy. Should the Force Protection Condition (FPCON) change, the Government may require changes in contractor security matters or processes.

B. For Contractors that do not require CAC, but require access to a DoD Facility and/or Installation. Contractor and all associated sub-contractors employees shall comply with adjudication standards and procedures using the National Crime Information Center Interstate Identification Index (NCIC-III) and Terrorist Screening Database (TSDB) (AFI 31-101 and AFI 10-245), applicable installation, facility and area commander installation/facility access and local security policies and procedures (provided by government representative), or, at OCONUS locations, in accordance with status of forces agreements and other theater regulations.

C. Antiterrorism Awareness Level I Training (AT Level I). This standard language is for contractor employees with an area of performance within a Government controlled installation, facility or area. All contractor employees, to include subcontractor employees, requiring access to Government Installations, Facilities and Controlled Access areas shall complete AT Level I awareness training within 10 calendar days after contract start date or effective date of incorporation of this requirement into the contract, whichever is applicable. Certificates of completion for each affected contractor employee and subcontractor employee will be maintained by the COR or Antiterrorism Representative. AT level I Awareness Training is available through ADLS by completing the Force Protection CBT.