Revised Statement of Work_0001.docx

Scope of work HVAC Repairs HQ Maintenance Building Project Summary:

This project will be to repair a Trane CGAM 20 ton Chiller model no. CGAM020A2F02AXD2A1A1A1AXXA1D1A4XXXXXBXA3X1DXXXCXX. The repairs will include removing and replacement of the circuit 1 Scroll Compressor Model no. CSHD125J0B0M. These repairs also will include removing and replace EXV Electronic Expansion Valve, Removing and Replace a non-working Dynaview Touch screen with new unit. Remove and replace leaking Condenser coil install a new coil to manufacture spec and fallow factory testing for leaks. Remove and Replace Liquid line filter drier and installing Update Software to latest Trane vision. You will also be required to PROPERLY RECOVER THE 410A REFERGERANT AND POLYOESTER Oil ACCORDING TO EPA GUIDELINES. You will be required to test the system for leaks and then properly Re-Charge the Unit and Add Sufficient Amount of Refrigerant and Oil to the System using a Tech View or Equivalent to Re-Activate Compressor to make it a working system.

All work shall follow Trane guidelines listed below for compressor replacement Compressor replacement After a mechanical failure of a compressor, it is necessary to change oil in the remaining compressor and also replace the liquid line filter drier. After an electrical failure of a compressor it will also be necessary to change oil in the remaining compressor, replace liquid line filter drier and add a suction filter drier with clean up cores Note Do not alter the refrigerant piping in any way as this can affect compressor lubrication.

Note Do not add filter drier within 10 inches of the elbow for CSHD compressors or within 16 inches of the elbow for CSHN compressors.

Refrigerant open time Model CGAM chillers use POE oil and therefore refrigerant system open time must be kept to a minimum. The following procedure is recommended:

Leave new compressor sealed until ready to be installed in the unit. Maximum system open time is dependent upon ambient conditions, but do not exceed one hour open time.

Plug the open refrigerant line to minimize moisture absorption Always change the liquid line filter drier Evacuate the system to 500 microns or below Do not leave the POE oil containers open to the atmosphere. Always keep them sealed.

Mechanical compressor failure Replace the failed compressor(s) and change the oil in the remaining compressor(s) along with the refrigerant system liquid line filter drier Electrical Compressor Failure Replace the failed compressor and change oil in the other compressor(s). Also add a suction filter with cleanup cores and change the liquid line filter drier. Change filters and oil until the oil no longer test acidic.

Compressor Motor Megging Motor megging determines the electrical integrity of the compressor motor winding insulation. Use a 500 volt megger. A less than 1 meg-ohm reading is acceptable and 1000 ohms per nameplate volts is required to safely start the compressor Refrigerant Piping The compressor suction and discharge lines are copper. In most instances the piping can be reused. If the piping is not reusable, order the correct service parts. Cut all tubing with a tubing cutter to prevent copper filings from entering the system. Cut the tubing in a straight length of pipe after the compressor connection has been unsweated. The line can then be reinstalled using a slip coupling and brazing.

The compressor suction line configuration must not be changed in anyway. Changing the compressor suction line configuration will compromise proper oil return to the compressor(s).

Compressor Oil Sump Heaters Compressor oil sump heaters must be energized at least 24 hours before starting the CGAM chiller. This is required to boil refrigerant out of the oil before startup. Ambient temperature is not a factor and the oil sump heaters must always be energized prior to startup.

All other work preformed under this contract shall meet industry standards for hvac repair and installation.

The contractor will provide all labor, equipment, supplies, materials, traffic control, supervision and any other related support to adequately to complete this project.

Objectives When the work is completed we will have properly operating Chiller system.

Time to Complete The work will start as soon as the contractor can start but must be completed by March 12, 2021.

Project Location The work will take place at Shenandoah National Park Head Quarters Maintenance area. 3655 US Hwy 211 East Luray VA 22835 build Number 04-57 Qualification Contractor’s personnel and subcontractors are adequately trained and qualified in their fields. All work under this contract shall be performed in a skillful and workmanlike manner Site visit Contractor bidders can request a site visit prior to submitting a quote for the upcoming work.

Verification Contractor is responsible for verifying all materials and quantities prior to quoting.

Work Hours The work shall take place between the hours of 7:00am and 4:30pm Monday through Friday excluding Federal holidays. The Contractor may submit a written request (at least three business days in advance) to the Contracting officer to work outside these hours. Approval will be at the Contracting officer’s discretion on a case by case basis.

Supervision and Inspection:

Work under this contract shall be monitored by the CO, the COR, and/or the Alternate Project POC Inspection Photography:

COR may request the contractor to provide additional digital photos if an NPS inspector is unavailable during a key phase of the project, as well as for hard to inspect areas due to limited or difficult access.

Permits Codes, etc:

The Contractor shall, without additional expense to the Government, be responsible for obtaining any necessary license and permits, and for complying with any Federal, State and municipal laws, code and regulations applicable to the performance of the work.

Health and Safety:

The contractor shall take proper health and safety precautions to protect the workers, the work site, the public, NPS employees and their other contractors, and the property of others. The contractor shall be responsible for all injuries to persons or damage to property that occur because of the Contractor’s fault or negligence. The Contractor shall follow the Parks guidance for Covid-19 and will be supplied with a copy of the covid-19 guide.

Care of Government Property:

The contractor shall conduct his operations in such a manner as to ensure against any careless or negligent acts that result in damage to Government property. The Contractor shall be held financially liable for any damage to Government property (to include grounds and roadways).

Protection of Site:

The Contractor shall be responsible for all materials delivered and work perform until completion and acceptance of the entire work, exception for any completed unit of work which may have been accepted under the contract.

Utilities:

Government will supply water and electricity needed to complete the job.

General Specs:

Trane CGAM 20 ton Chiller Model no. CGAM020A2F02AXD2A1A1A1AXXA1D1A4XXXXXBXA3X1DXXXCXX Circuit 1 Compressor Trane Scroll Compressor Model CSHD125J0B0M Trane part number 570010512100 Serial number 12051RMK3A Field service part no. COMO9853 Voltage 200-230v /3/60hz Max amps 48

LRA 267A

POLYOESTER OIL REFRIGERANT 410A