Attachment 1 - SOW.pdf

Section C - Statement of Work

BACKGROUND:

U.S Government Printing Office (GPO) provides publishing and dissemination services for the official and authentic government publications to Congress, Federal agencies, Federal depository libraries, and the American public. The intention of this statement of work is to procure 3 Air Rotation Units (ARU’s).

No installation is required. GPO will install the three ARU’s.

1.1 DESCRIPTION OF WORK

Chilled Water Cooling and Hot Water Heating Air Rotation System.

1.2 REFERENCES

A. National Fire Protection Association (NFPA):

1. NFPA 90A - Standard for the Installation of Air Conditioning and Ventilating Systems.

2. NFPA 90B - Standard for the Installation of Warm Air Heating and Air Conditioning Systems.

B. Air-Conditioning, Heating, and Refrigeration Institute (AHRI):

1. AHRI 410 – Forced Circulation Air-Cooling and Air-Heating Coils.

1.3 AIR ROTATION UNITS

C. American Society for Testing and Materials International (ASTM):

1. ASTM B75- Standard for copper tubing pressure application.

D. Underwriters Laboratories, Inc. (UL):

1. The unit shall be manufactured and installed in accordance with the requirements of the Underwriters Laboratory standard; “Ductless Large Open Building Heating and Cooling Equipment - Category LZPG” and bear the official UL Label.

1.4 ACTION SUBMITTALS

A. Submittal Procedures: Submittals of all equipment drawings, schedules and specifications must accompany quote.

B. Shop Drawings: Indicate assembly, required clearances, and locations and sizes of field connections.

C. Product Data: Submit manufacturer's literature and data indicating rated capacities, weights, accessories, electrical nameplate data, and wiring diagrams.

D. Manufacturer's Installation Instructions: Submit/Indicate rigging and assembly.

1.5 INFORMATIONAL SUBMITTALS

Manufacturer's Certificate: Certify products meet or exceed specified requirements.

1.7 CLOSEOUT SUBMITTALS

A. Execution Requirements: Closeout procedures.

B. Operation and Maintenance Data: Submit manufacturer's descriptive literature, operating instructions, maintenance and repair data, and parts listing.

1.8 QUALIFICATIONS

Manufacturer: Company specializing in manufacturing products specified in this section with minimum 10 years documented experience.

1.9 WARRANTY

A. Furnish one (1) year manufacturer parts only warranty for all equipment.

PART 2 PRODUCTS

2.1 AIR ROTATION UNIT DESIGN CRITERIA

A. Drawing Designation: 04 00 SA ARU-1, 2 and 3.

B. Self-contained, pre-wired unit consisting of cabinet, supply fan, chilled water-cooling coils, hot water heating coils and accessories:

1. The unit shall be designed for indoor mounting. The unit will have the capabilities of heating, cooling, filtering, and circulating as detailed in the submittal drawing.

2. The unit shall be factory assembled and tested prior to shipping, disassembled for shipping, and reassembled on site by the awarded contractor as required.

3. System and accessories to be UL listed and approved as a complete unit.

4. Heating: Draw through hot water heating coils.

5. Unit Configuration: Vertical with horizontal discharge. Units shall have control panel serviceable from ground level.

6. Lifting Provisions: Lifting provisions shall be included on all units as an integral part of the equipment.

7. Supply Voltage: 460V, 3ph., 60 Hz

8. Control Voltage: 120 volt, 1ph, 60 Hz

9. All bolting hardware and wiring harnesses shall be furnished, tagged and labeled for ease of installation by the installing contractor.

2.2 MANUFACTURERS

A. Johnson Air Rotation.

B. Trane.

2.3 CASING

A. Frame Construction: Shall be angle iron framing with 3/16-inch horizontal flange and 1/8-inch vertical framing and factory painted, suitably reinforced and braced to permit the loading, shipping, unloading and rigging to the unit location and general handling of completed sections without damage to external or internal components or misalignment of factory assembled components due to normal handling techniques.

B. Cabinet Construction: 18-gauge A-60 bonderized steel suitable for factory painting. The panels shall be factory assembled using flat bar screwed construction and have a reinforced steel angle flange assembly. Unit shall be factory painted using factory standard powder coated finish.

C. Interior of units shall be white powder coated antimicrobial coating.

D. Insulation: All sections of the Air Rotation unit shall be closed cell injected foam between outer and inner panels of the unit.

E. Overall assembled height shall not exceed 120”.

2.4 ACCESS DOORS

Access Panels: Hinged access doors in the unit housing shall be provided to permit ready access to all internal components. The access doors shall be a minimum of 18-gauge galvanized steel. The doors shall be designed to swing out. The doors shall be provided with a continuous 16-gauge stainless steel piano hinge. The unit’s wall panels shall an integral part of the doorframe. The unit’s fan compartment access for inspection and adjustment shall be UL approved. A warning placard shall be affixed at the access door indicating that the unit is to be shut off before opening the door and entering the fan compartment.

2.5 ELECTRICAL AND CONTROLS

A. Controls

1. The power panel shall have a locking dead front main power cabinet with disconnect and containing necessary fuses, sub-circuits, magnetic starters with 3-leg protection, relays and contactors requiring only a single 3-phase connection.

2. The factory units’ controls shall be furnished and field installed by the ATC contractor

3. Variable frequency drive(s) –Shall be per requirements of specification 25 00

4. Air Handler Control System. Controls are to be furnished and installed by GPO.

5. Actuator power as part of GPO supplied control system.

6. Relative humidity monitoring and re-heat controls shall be furnished and field installed by the ATC contractor.

2.6 FAN(S) AND MOTOR(S)

A. Supply Fans:

1. The supply fans, a minimum of two per unit, shall consist of SWSI type belt-drive plenum fans.

2. Fans shall have the capacity, and class, as scheduled.

3. Blower Shafts - Blower shafts shall be solid ground and polished. The shafts shall not pass through their first critical speed when the unit comes up to the rated RPM. Shaft shall be coated with a rust inhibitor.

4. V-Belt Drives - All V-belt drives shall be standard capacity dual belt type, furnished in matched sets with reinforced rubber belts. The sheaves shall be of a cast iron type.

5. The service factor used for V-belt drive selection shall be not less than 1.25.

6. Lubrication – Extended grease lines shall be provided to the drive size of the fan assemblies.

7. Motors shall Baldor RPM-XE AC Motor TEFC, 1800 RPM, 460-volt, 3 phase, 60 Hz. Motor horsepower shall be as indicated on the schedule “Table A”.

8. Supply fans with heating or cooling coils in the ‘Blow-Through’ configuration is not acceptable.

2.7 HEATING COILS

A. Hot Water Coil: Designed to withstand 250-psi maximum operating pressure and a maximum water temperature of 300-degrees F (independently):

1. Coils shall be AHRI Standard 410 certification and bear the AHRI symbol.

2. Coils shall be factory tested at a minimum of 315-PSI air pressure for standard copper tube coil.

3. Tubing shall be constructed from UNS 12200 seamless copper conforming to ASTM B75 and ASTM B251 for standard pressure application.

4. Header shall be constructed from UNS 12200 seamless copper conforming to UNS 12200 seamless copper conforming to ASTM B75 and ASTM B251 for standard pressure application. Hot water coil return header shall be equipped with factory installed 1/2-inch FPT air vent connection placed at highest point on the face of the header.

5. Connection shall be standard construction male pipe thread (MPT) and constructed from red brass conforming to ASTM B43 or schedule 40 steel pipe minimum.

6. Casing shall be constructed of 16-gauge galvanized steel meeting ASTM A527. Coil shall be installed by manufacture incorporating a pitch of a minimum of 1/8-inch per foot of finned length.

2.8 COOLING COILS

A. Cooling Coils:

1. Cooling coils shall be placed in a draw through position located in the base section of the unit for ease of maintenance.

2. Cooling coils shall use 0.035-inch copper tubes and 0.0075-inch aluminum fins. Coil casings shall be 304L stainless steel.

3. Drain pans shall be triple-pitched for complete drainage and be constructed of all welded 304 stainless steel. The underside of the drain pan shall be completely double-wall insulated with 1.5 inches of spray on foam insulation. Intermediate drain pans (as required) shall be stainless steel and have a stainless-steel downspout to the lower drain pan. The drain pan connection shall be about 8" above the unit base for trapping by the installing contractor.

4. Face velocity of cooling coils shall not exceed 500 fpm.

5. Supply fans with cooling coils in the ‘Blow-Through’ configuration is not acceptable.

6. Access door(s) shall be provided into base section. Internal walk-on grating shall be provided in bottom of coil section, full-length of unit.

2.9 FILTERS

A. Mixed Air Filter Frame and Air Filters: Filter frame shall be fabricated of 16-gauge galvanized steel and painted to match the unit’s color. Filters shall be upstream service, mounted at floor level for ease of access. Filters will be 2-inch MERV-13.

B. Filter Maintenance Indication: Dwyer Magnehelic gauge with factory setting to indicate filter change.

2.10 FILTER/MIXING BOX SECTIONS

A. External mixing box shall be provided upstream of the A/C coils.

B. Mixing box to have the same construction/finish/insulation as the Air Rotation equipment.

2.11 DAMPERS

A. Low leak outdoor air dampers with blade and jamb seals (Ruskin CD-60 or equivalent) sized for 660 CFM outside air. Belimo 120V two-position actuators to be provided, mounted, and wired by ARU manufacturer at all outdoor air damper openings.

B. Low leak return air dampers with blade and jamb seals (Ruskin CD-60 or equivalent) sized for 7,500 CFM return air. Manual hand quadrant included.

C. Hot water coil bypass dampers sized for 3,750 CFM air bypass. Manual hand quadrant included.

2.12 DISCHARGE

A. Discharge Louvers:

1. Adjustable horizontal and vertical louvers mounted within a welded frame shall be painted to match cabinet finish.

2. Turning vanes will be factory installed in air discharge section of units.

2.13 ACCESSORIES

A. Air outlet extension(s), as required, to raise discharge level to 10’0”.

B. UV lights – 17 W/ft^2 intensity UV lights shall be provided and installed downstream of the A/C coils. Lights shall be powered from unit single point power connection/disconnect. All access door interlock switch(es) by ARU manufacturer.

C. Freight to job site and factory-assisted start-up services shall be included with all bids.

2.14 IDENTIFICATION AND LABELING

A. The unit nameplate shall include the unit model number, serial number, Full Load Amps, and supply voltage.

B. The units shall be permanently marked with the equipment number indicated in the schedules.

C. All matching pieces of units shipped in sections shall be marked for easy identification of adjoining sections. Lifting points shall be marked.

D. Proper warning labels for high voltage and moving parts shall be permanently affixed to access doors.

E. An electrical ladder diagram shall be permanently affixed inside of the electrical control panel.

The schematic shall be specific to the project and not be a generic type encompassing features or options not present on the unit. The schematic shall include the fuse replacement values and types.

2.15 Unit Description

Qty: 3 each. See Table A for Sizing.

Tag: 04 00 SA ARU-1, 04 00 SA ARU-2, 04 00 SA ARU-3.

A. Indoor construction.

B. Fire protection interlocks – Emergency shut down circuit to be supervised by the fire protection system in the facility. At owner’s option this can be accomplished with an external power source of either 120V or 24V. Smoke detector(s), if required, provided and installed by others.

C. CUSTOM TENV Marathon permanent magnet induction motor(s).

D. Exterior air-dry enamel finish. Submit standard colors for owner selection.

E. Casing consisting of 2” Double Wall with spray foam insulation and 20ga inner liner.

F. Vertical and horizontal discharge louvers, painted to match cabinet finish.

G. Total unit height not to exceed 10’0”.

H. Fans, High Static low noise, SWSI type fan(s).

I. Integral turning vane in discharge plenum.

J. Draw through HW heating coil; Coils consist of copper tubes, aluminum fins and galvanized steel casing.

K. Draw through CW cooling coil; Coils consist of copper tubes, aluminum fins and 304L SS casing.

L. Stainless steel triple-pitch drain pan in cooling coil section, constructed of all welded 304 stainless steel, double-wall insulated. Includes walk-on grating.

M. Terminal strip for field provided and installed controls by others

N. Mixed air filter track(s) with one (1) set of 2” MERV-13 filters.

O. Minimum outside air damper sized for 660 CFM. 2-position actuator included.

P. Return air balancing damper with manual hand quad.

Q. Magnehelic gauge with a factory setting to indicate when filter maintenance is required.

R. UV Lights (standard intensity) S. Standard 1 Year Parts Warranty

T. Factory Assisted assembly and startup supervision, 16 hours for 3 units.

U. One 8-hour day of Commissioning support and Training in addition to the assembly and startup supervision.

V. Freight to Washington DC

PART 3 EXECUTION

3.1 COMMISSIONING AND USER TRAINING

A. Technical Field Service/Start-up Supervision:

1. The services of a factory trained Field Engineer will be provided at no extra cost to Government to supervise placing the system in operation and good adjustment. The Field Engineer will instruct the Government’s personnel in good equipment operation, and review maintenance procedures with Government’s qualified personnel or representatives.

B. The start-up shall include but not be limited to:

1. Verification of proper supply power.

2. Verification that electrical terminals are secure.

3. Verification of proper airflow balance.

4. Testing of all safety and operating controls.

5. Verification that units are operating correctly and with design specifications.