LAW HVAC Replace SOW_Final.pdf

U.S. Department of Transportation Federal Aviation Administration

Southwest Region

PROJECT

SCOPE OF WORK

FOR

DESIGN/BUILD CONTRACT

02 APRIL 2015

HVAC REPLACEMENT PROJECT

LAWTON ATCT

LAWTON MUNICIPAL AIRPORT

LAWTON, OK

Engineering Services AJW-2C15G Central Service Area

Fort Worth, Texas

Index

A GENERAL

B SITE LOCATION

C EXISTING HVAC SYSTEM DESCRIPTION

D EXISTING HVAC SYSTEMS PHOTOS

E SCOPE OF WORK

ATTACHMENTS

PROJECT SPECIFICATIONS

EXISTING DRAWINGS:

(Available electronic drawings)

LAW-D-ATCT-M101

LAW-D-ATCT-M201

LAW-D-ATCT-M202

LAW-D-ATCT-M203

LAW-D-ATCT-M301

LAW-D-ATCT-E001

LAW-D-ATCT-E002

LAW-D-ATCT-E003

LAW-D-ATCT-E004

EOSH Impacts Document

LAW ATCT HVAC Replacement Lawton, OK

A GENERAL

This document covers the requirements of the Federal Aviation Administration (FAA) for a design-build project to replace the HVAC Systems at the Lawton ATCT

B SITE LOCATION

3112 SW Sheridan Rd Lawton, OK 73501

LAT\LON 34°34'35.04"N, 98°25'16.67"W

C EXISTING HVAC SYSTEM DESCRIPTION

The LAW ATCT is a Type “O” Tower consisting of 4 floors, a Junction Level and a Control Cab.

1. The HVAC systems consist of the following:

a. AHU-1 serves the Cab. It is a Trane # SAUCC10, 10-ton self-contained unit. The unit utilizes R-22 The Cab backup system consist of two exhaust fans located above the cab ceiling, therefore there is no cooling backup for the Cab.

b. AHU-2 serves the fourth floor as well as the third floor electronic equipment room.

The unit is the same as AHU-1, a Trane #SAUCC10. The unit utilizes R-22.

c. AHU-3 serves the second floor Administration areas. The unit is a Trane #TWE036, 3-ton unit with distribution ductwork throughout the floor. The condensing unit serving AHU-3 is CU-3 and is located outside the building at the ground level. The unit utilizes R-22 .

d. AHU-4 serves the first floor. The unit is a Trane TWE036 air handler. It is a heating only unit with an electric heater. The electrical service from this unit is not within code and is served by an abandoned 3-pole breaker in the main distribution panel.

D EXISTING HVAC SYSTEMS PHOTOS

AHU-1 (serves Cab)

AHU-2 (serves third and fourth floors)

Condenser air intake and exhaust for AHU-2 (AHU-1 sim.)

AHU-3 (serves second floor admin area)

Electrical feed for ground floor heating only unit.

Partial view of two wires on a 3-pole 150 A breaker.(oversized and only 2-pole brkr reqd)

CU-3 (serves AHU-3 at second floor)

E SCOPE OF WORK

The work includes, but shall not be limited to the following:

1. After the work is awarded, the contractor shall conduct a Site Survey (SS) and gather all the information required to proceed with the engineering, based on the agreed Scope of Work(SOW). The contractor shall report any discrepancies or necessary changes to the

SOW.

2. After the SS the contractor shall design a functioning system based on the agreed SOW.

The contractor shall prepare the engineering drawings using MicroStation or AutoCadd format. The provided drawings are available in electronic format; (other drawings may be available) any additional drawings required for the design package shall be created by the contractor.

3. Upon review and approval of the design and all related submittals, the contractor will then proceed with the construction phase of the project.

4. The contractor’s design drawings shall include, but shall not be limited to:

a. Schedule of equipment showing capacities, models and accessories.

b. All proposed equipment shown on dimensioned drawings

c. Any details and sections that are required to clearly indicate the installation.

d. Temporary HVAC units (if required) and method for connecting to facility.

e. Any variances or modifications from the FAA’s statement of work.

f. Construction schedule.

5. The Specific HVAC and Electrical requirements to be designed and implemented are, but shall not be limited to, the following:

a. Demo existing HVAC and Electrical systems and remove as required to implement the new equipment. No abandoned equipment or materials shall be left in place.

b. Replace existing Cab unit AHU-1 with a commercial split system air handling unit.

The condensing unit will be located at the ground level and piped up to the AHU at the fourth floor. The AHU shall be equal to Carrier 39MN units and the Condensing Unit shall be equal to Carrier 38AUD units.

i. Demo existing condenser O/A intake and Exhaust. The opening shall be enclosed with the siding material, by the same manufacturer as the remaining exterior of the building.

c. Replace existing AHU-2 with a commercial split system air handling unit. The condensing unit will be located at the ground level and piped up to the AHU at the fourth floor. The AHU shall be equal to Carrier 39MN units and the Condensing Unit shall be equal to Carrier 38AUD units.

i. Demo existing condenser O/A intake and Exhaust. The opening shall be enclosed with the siding material, by the same manufacturer as the remaining exterior of the building.

d. Install new VRF system to serve as backup for the Cab. The system will consist of ceiling cassette units and a condensing unit. The VRF system shall be equal to Toshiba MMU cassette units and Toshiba MMY condensing units.

i. Demo and replace Cab ceiling.

ii. Demo existing exhaust system located above Cab ceiling.

iii. Replace existing can lights in Cab ceiling with modern, energy efficient, lighting.

iv. The VRF condensing unit shall be selected to ensure that cooling or heating can be accomplished while in the Defrost Mode.

e. Install new VRF system to serve as backup for the third floor Electronic Equipment Room. The system will consist of ceiling cassette or high wall units and a condensing unit. The VRF system shall be equal to Toshiba evap units and Toshiba MMY condensing unit.

f. Replace the existing AHU and CU serving the admin area with a similar unit utilizing an approved refrigerant. The new split system shall be equal to Carrier FX4B fan coil with electric heat and 24ACB6-2 stage, condensing unit (16 SEER)

g. Replace the electrical serving the first floor heating only air handler. Identify location in existing panelboards to feed the existing unit. Provide new breakers. Provide disconnect adjacent to unit.

h. Provide duct cleaning services for all existing supply and return ductwork and registers.

i. Install new electrical disconnects for condensing units and air handling units.

Disconnects for interior shall be equal to: NEMA 1, Heavy Duty Disconnects for exterior use shall be equal to: NEMA 3R, Heavy Duty

j. Replace all electrical power wiring feeding HVAC equipment. Existing electrical conduit may be reused if found to be in good condition.

k. Provide duct cleaning services for all existing supply and return ductwork and registers.

l. Reuse/maintain existing HVAC equipment grounding system.

6. The new systems shall utilize environmentally friendly refrigerant.

7. It is required that the Cab and the Third floor Electronic equipment room be provided with air conditioned cool air at all times. It is recommended that the contractor plan to install the backup systems for these areas prior to removal of the primary systems.

8. Contractor shall demo completely the existing systems that are to be replaced.

9. Modify existing ductwork and/or add ductwork as required to install new HVAC systems.

10. All Refrigerant lines shall be routed from the condensing unit, up the exterior of the building, to their respective AHU. Refrigerant lines shall be enclosed within a painted, 20 GA, sheet metal enclosure(s). Refrigerant lines in enclosure shall be continuous, i.e shall not have joints.

11. The contractor shall provide a Full Parts and Labor Warranty as described in the Specifications.

12. All submittals must be approved before the construction phase of the project can begin.

13. The contractor shall ensure that there is no interruption of utility services to the site during the project. The contractor is prohibited from using facility power or utilities during the course of this project without the permission of the Contracting Officers Representative (COR)/Resident Engineer (RE).

14. The facility is a 7 day per week operational facility used to direct air traffic. The facilities normal hours are from 8:00 am to 7:00 pm. It will be necessary for the Contractor to schedule and plan all work, and coordinate with the COR, so that normal facility operations may continue with a minimum of disruption or interference.

15. All work occurring in the Cab, or work that could disturb the operations in the Cab, must occur between the hours of 7:00 pm and 8:00 am.

16. For new ductwork, the contractor shall provide and install #2 AWG bonding and grounding cables interconnected to sections of ductwork and equipment. The terminal lugs must be in bare contact to the sheet metal skin and then applied with protective coating.

17. The contractor shall provide the following HVAC auxiliary tools and turn over to FAA SSC technician: Provide Yellow Jacket or equal (HVAC tools manufacture that has been in business for at least 10 years.)

a. One (1) - R-410A manifold pressure gauge,

b. One (1) - UPC 68802 Ritchie 110 lbs Digital Electronic Charging scale,

c. One (1) - RC30 Refrigerant Recovery Cylinder, 30 lbs

d. One (1) – YJ-LTE Refrigerant Recovery System

18. All work shall be done in compliance with all national standards governing such work, such as those standards published by ASHRAE, NEC, NFPA, as well as the International Codes. In addition, all work shall be done in compliance with FAA documents FAA-C- 1217f and FAA-STD-019e.

19. The contractor is responsible for any damage to the facility during construction and shall make any necessary repairs. Damage caused by the Contractor's activities to existing paving, lawns, curbs, sidewalks, interior/exterior of adjacent buildings shall be repaired to the original condition. All costs of repairs shall be paid by the Contractor. After notice to proceed and prior to the start of construction, the Contractor and COR shall conduct joint inspections of the existing areas affected by the construction. Existing damage/defects shall be noted and will be used as the basis for determination of damages caused by the Contractor's operations.

Federal Aviation Administration