FAA-CLT-09-09.pdf

7/8/2019 FAA-CAE-19-09

SCOPE OF WORK

FOR REPLACING ALL EXISTING HVAC SYSTEMS

AT THE

AIRPORT SURVEILLANCE RADAR FACILITY

CHARLOTTE/DOUGLAS INTERNATIONAL AIRPORT

CHARLOTTE, NC

1. GENERAL.

1.1. These specifications cover the requirements of the Federal Aviation Administration for replacing two existing 25-ton packaged cooling units with new similar units in the radar equipment room, and replacing a single existing 6-ton hvac split system with two 4-ton hvac split systems in the adjacent PCS room at the Air Traffic Control Tower facility at the Charlotte/Douglas International Airport in Charlotte, NC.

1.2. The requirements of these specifications are intended to be in conformity with all current building, electrical, mechanical and OSHA codes. If they are found to be in conflict, the contractor shall notify the pertinent FAA official prior to continuing. The contractor shall also adhere to all Federal, state, and local labor and safety statutes that may apply.

1.3. ACRONYMS AND ABBREVIATIONS.

AF - Airway Facilities ASR – Airport Surveillance Radar Btu – British Thermal Unit CFM - Contractor Furnished Material cfm – cubic feet per minute CLT – Identifier for Charlotte, NC CO - Contracting Officer COR - Contracting Officer's Representative EMT – Electrical Metallic Tubing FAA - Federal Aviation Administration GFM - Government Furnished Material MAX - Maximum MIN – Minimum NTP - Notice To Proceed RGS – Rigid galvanized steel (conduit) SSC - System Support Center (local FAA)

2. CONDITIONS AFFECTING WORK.

2.1. SCOPE OF WORK. The scope of work shall include, but is not limited to, furnishing all labor, materials, tools, equipment, and services as necessary to replace the two 25-ton equipment room package hvac units and the 6-ton PCS room hvac split system.

The new units will replace existing functional units at an operational facility. The general scope of work is as follows:

a) The contractor shall remove the existing 25-ton unit from its location on the concrete pad. Detach supply and return ducting, if necessary. Detach and dispose of existing unit’s 200A disconnect switch, wiring between disconnect and unit and the short length of flex conduit. The RGS conduit can be left in place and reused.

b) Install new 25-ton unit atop the pad and reattach supply and return ducting. Reseal ducts and recoat ducting shroud.

c) Install new disconnect switch, similar to existing configuration. Terminate existing power wiring to the new exterior disconnect switch, and install new wiring from the new disconnect switch to the new unit in existing RGS conduit and in new flex conduit. New entities shall be weatherproof, UL listed, and comply with NEC.

d) Terminate existing control wiring to the new unit’s designated terminal strip. Additional wiring may be necessary to control the unit from the thermostats.

e) The contractor shall remove from site and properly dispose of the existing unit.

f) Demonstrate the operational characteristics of the unit to the satisfaction of the FAA.

g) Repeat steps a) thru f) for the second 25-ton unit.

h) Install a new 4-ton condenser unit atop a prefab pad outside the north wall of the PCS room.

i) Install a new 4-ton air handler on the interior north wall of the PCS room, just below existing ducting.

j) Install wiring in conduit, from separate new breakers panel EPA in the equipment room, to the condenser and to the air handler. Wiring shall run through new properly rated disconnect switches, mounted adjacent to entities.

k) Install properly sized insulated copper piping, with site glass and dryer, between the condenser and air handler for refrigerant supply and return

l) Install new thermostat and wiring for the new split system. Mount thermostat on opposite wall from the air handler.

m) Demonstrate operational cahracteristics on the new 4-ton unit to the satisfaction of the FAA.

n) Remove and properly dispose of the existing 6-ton split system complete, including condenser, air handler, dicting, piping, wiring, etc.

o) Repeat steps h) thru m) for the second 4-ton split system.

2.2. SCHEDULING OF WORK. The scope of work under this contract requires working on operational FAA facility. The contractor, therefore, will be required to coordinate his activities with the COR who will be identified at the preconstruction conference. The COR or his designated representative shall escort the contractor, and shall remain on site whenever the contractor is onsite. All work, including daily cleanup, shall be performed between the hours of 8:00 AM to 5:00 PM, Monday through Friday, unless otherwise coordinated with the local FAA.

2.3. SITE VISIT. The bidder is expected to carefully examine the site and all areas of proposed work to see firsthand the extent of work involved. The submission of a proposal will be considered prima facie evidence that the bidder has made such an examination and is satisfied as to the conditions to be encountered in performing the work. It shall be the responsibility of the bidder to make his own interpretations of existing site conditions as the drawings and specifications may not reflect all site characteristics. To schedule a site visit, contact Larry Montgomery, FAA CLT SSC Manager, at (704)359-1144.

2.4. WORK LOCATION. The contractor will be responsible for

obtaining all required insurance, bonding, badges, etc. as required by the CO. Power is available, but no restrooms or water is available.

2.5. WORK ACCESS. Access to the site requires passing through a security gate. Therefore, the local FAA will escort the contractor to and from the site on a daily basis, unless alternate arrangements are agreed upon at the preconstruction conference. The contractor shall coordinate his schedule to the local FAA in order to secure a daily escort.

2.6. WORKERS. Due to security regulations, no foreign national workers will be allowed on the job site without 30 day notification and approval. Contact the SSC Manager for further information.

2.7. DEMOLITION. Any equipment or material to be removed, unless specified to remain the property of the FAA, shall become the property of the contractor and shall be transported from the site and disposed of in a legal manner. Demolition and removal work shall be performed in compliance with safety procedures, applicable requirements of the State and local regulations, and with Federal and FAA requirements.

2.8 SAFETY STANDARDS. Contractors shall comply with all

applicable federal, state, and local requirements for protecting the safety of the contractors’ employees, building occupants, and the environment. In particular, all applicable standards of the Occupational Safety and Health Administration (OSHA) shall be followed when working in accordance with this specification.

2.9 WORKING CONDITIONS. Construction/demolition shall in no way interfere with Air Traffic Control Operations. Extreme care shall be exercised so as not to cause any interference or interruption of service from this facility. It is absolutely mandatory that the contractor protects FAA personnel, communication, electrical and mechanical equipment both inside and outside the building from damage caused by work impact, water, debris or dust. The contractor shall have the overall responsibility for the performance and enforcement of all forms of protection within the premises against any damages due to work performed under this contract. Any damages incurred, as a result of construction activity during the performance of this contract will be repaired/replaced immediately by the contractor at no cost to the

FAA.

3. SUBMISSIONS.

3.1 Prior to job start, the contractor shall submit to the CO the following:

a. Product literature on the new HVAC units which show that ALL specified items set forth in Section 4.4 and 4.5 are met or exceeded.

All submissions should be submitted within 10 days from contract award for a determination of specification compliance by the Government prior to said product manufacture.

4. MATERIAL.

4.1. GENERAL. All material specified herein shall be supplied, transported, maintained handled installed and stored by the contractor. All material estimates and measurements are the responsibility of the contractor.

4.2. MATERIAL SPECIFICATIONS. All material shall adhere to the guidelines and specifications set forth in the latest editions of the UL, and ASTM publications. Items 4.4. through 4.8. are major CFM items, however, they are not inclusive of all CFM items.

4.3. EXISTING UNITS. The three existing units to be removed and disposed are: Trane, model # TCD300B300HB (2 each, equipment room) and Addison, condenser model # RC074003G; air handler model # VCH074S-3E-T-AAA-2 (1 each, PCS room)

4.4. NEW PACKAGE UNITS. The new package units for the ASR

equipment room shall be 25-ton cooling capacity; cooling;

outdoor, rooftop/curb mounted; horizontal supply/return (to match existing supply/return configuration), and shall include the following features:

4.4.1. ARI Certification.

4.4.2. Cooling capabilities shall be based on 95-degree F DB

entering condenser and 80 degrees F DB/67 degrees F WB entering evaporator.

4.4.3. Dual, hermetic scroll compressors with suction and

discharge service valves, vibration isolators, crankcase heaters, sight glass, and filter dryer.

4.4.4. Independent refrigeration circuits for full backup.

4.4.5. Low pressure/loss of charge protection, dual freeze

protection and high pressure switches.

4.4.6. Multispeed direct drive for evaporator.

4.4.7. Insulated cabinet with 500-hour salt spray protection, pre-painted, galvanized steel.

4.4.8. Dedicated vertical supply and return configurations, to match existing duct configuration.

4.4.9. Constant air volume controls.

4.4.10. Superior airside performance up to 2.0” (max) net ESP.

4.4.11. Full cable ready DDC controls are standard.

4.4.12. High efficiency evaporator fan motors.

4.4.13. Service option package (available individually):

- Hinged access panels

- Non-fused internal circuit breaker

- Non-powered 115V GFCI Convenience Outlet

4.4.14. Condenser coil hail guards.

4.4.15. Low ambient kit (0 deg F), consisting of:

- variable fan control (motor master)

- heated receiver on discharge line

4.4.16. Ignore economizer mode; do not install outside air

intake hoods.

4.4.17. Provide factory-recommended pleated filters. Provide

initial set and spare set for each unit.

4.4.18. Units shall be wired at factory so that when thermostat and humidistat set points are satisfied, all compressors shall immediately de-energize.

4.4.19. Provide a spare microprocessor control circuit board.

Spare circuit board shall be identical to and fully compatible with circuit boards factory-installed in air conditioning units.

4.4.20. Provide protective factory-applied black epoxy coating for the evaporator and condenser coil fins. Drain pan shall be sloped, insulated stainless steel. Coil fins shall be aluminum-copper.

4.4.21. Provide each unit with anti-short cycle timers for each compressor, time delay relays, and compressor unloaders. All time delay relays shall be adjustable type (0 to 5 minutes).

4.4.22. Units shall operate on 208V/60Hz/3Ph.

4.4.23. Air flow ratings: 9,200cfm (nominal).

4.4.24. Efficiencies: 12.0 EER (min).

4.4.25. R-410A Refrigerant.

4.4.25. Electric heat (N/A).

4.4.26. Dehumidification reheat option (N/A).

4.4.27. Warranty: extended 5-year parts, labor and refrigerant warranty.

4.5. NEW SPLIT SYSTEM UNITS. The new split system units for the PCS room shall be 4-ton cooling capacity; cooling; outdoor, rooftop/curb mounted; horizontal supply/return (to match existing supply/return configuration), and shall include the following features:

4.5.1. ARI Certification.

4.5.2. Cooling capabilities shall be based on 95-degree F DB

entering condenser and 80 degrees F DB/67 degrees F WB entering evaporator.

4.5.3. Low ambient kit (5 deg F)

4.5.4. Efficiencies: 10.0 EER (min).

4.5.5. R-410A Refrigerant

4.5.6. Units shall operate on 208V/60Hz (condenser); 120V/60Hz (air handler)

4.5.7. Air handlers shall provide 1000 to 1400 CFM

4.5.8. Interconnecting refrigerant piping shall be insulated

copper, 3/8” dia for liquid line and 5/8” dia for gas line.

4.6. DISCONNECT SWITCH. 200A, 3-pole, solid neutral (for package units) and separate disconnects for split system condensers and air handlers, sized to match breaker size. All disconnects shall have with ground bar, 240V, in “Heavy-Duty” NEMA 3R enclosure (exterior locations). Provide new fuses and a complete spare set.

4.7. BREAKERS. Breakers for split system entities shall be

installed in adjacen available locations in panel EPA (in equipment room). Breakers shall be sized and poled per manufacturer’s requirements and shall be compatible with the “Westinghouse” EPA panel. For information, existing single pole breakers are type C#EHD1020 (for 20A).

4.8. WIRE. Stranded copper, properly sized for amperage, THWN insulated.

4.9. CONDUIT. RGS for exterior applications, EMT for interior applications, exterior flex where connected to unit for vibration dampening. Sized per NEC for # of conductors, min ¾” dia, fastened per NEC.

4.10. HARDWARE. All exterior fasteners and hardware shall be

stainless-steel.

4.11. SEALANT. Silicon sealant, Dow Corning 795 or equal, for minor sealing of openings as required.

4.12. THERMOSTATS. New thermostats shall be furnished and

installed by contractor. Thermostats shall be compatible with unit served and programmable. Thermostats for package units shall be similar to existing. The package units have an existing third master thermostat that shall remain in place. Settings shall match existing for package unitsa nad shall be 10 degree staggered for split systems.

5. INSTALLATION.

5.1. GENERAL. The units are presently operational, and are

conditioning an operational radar facility. Therefore, the unit shall be replaced as quickly as possible, with backup temporary cooling available if necessary, so that the facility’s required operating temperature range is maintained.

5.2. Ensure unit to be replaced is electrically disconnected by properly locking-out/tagging-out its pertinent circuit breaker in the supplying distribution panel. Disconnect all wiring to the unit.

5.3. Remove unit after disconnecting ducting, fastening

hardware, conduits, and wiring.

5.4. Install new unit, level and plumb, atop pad/curb.

5.5. Reterminate power wiring to unit’s breaker.

5.6. Reattach existing supply and return ducts as necessary to provide a supply–and-return air-duct system into the facility, similar to existing.

5.7. Reconnect conduit and reterminate thermostat wiring to the new unit’s control panel. If the new cooling unit’s panel is in a location in which existing conduit and/or wiring is insufficient in length, the contractor shall furnish and install new cables and conduit as necessary.

5.8. Install new PVC condensate drain lines to match existing configuration.

5.9. Demonstrate proper operation of the unit by using new

thermostat configuration and settings. Turn over applicable warranties and manuals to local FAA.

5.10. Remove and dispose of the existing old unit.

6. CLEANUP.

6.1. Before final inspection, the contractor shall thoroughly clean within the construction limits and the surrounding areas affected by this work, including the following:

a. All construction facilities, debris, and rubbish shall be removed from the buildings and the site on a daily basis.

b. All tools, scaffolding, temporary utility connections, building, etc., belonging to the contractor or used under his direction shall be removed from the site.

6.2. All grounds, walkways, and other areas adjacent to the work shall be restored to the original condition before the contractor is released.

7. INSPECTIONS. The contractor shall allow the COR, or other persons designated by the CO, complete access to all portions of the work. The COR shall coordinate and schedule a final inspection date. All work shall be accepted when all work required by this contract, including punch list items, is finished and has passed inspection.

8. PHOTOS.

Existing package units

Existing package unit, showing disconnect switch (to be replaced), RGS conduit (to remain), flex conduit (to be replaced)and internal wiring (to be replaced)

Existing ducting shroud

Existing package unit disconnect switch

Existing PCS room 6-ton condenser, disconnect and piping (to be removed). New 4-ton condensers and disconnects to be installed near north wall (to the left)

Existing 6-ton air handler

Location of new 4-ton air handlers (below ducting on north wall)

Panel EPA in equipment room; location for split system breakers