5 SOW Attachment - Project Design Narrative.pdf

Department of Veterans Affairs

James A Haley VA Hospital, Tampa, FL

“Replace Air Handling Unit ED-203”

673-21-151

100% Construction Documents Narrative

Contract Number:

36C24819D0022 36C24822N0366

March 29th, 2023

VA Tampa – Replace Air Handling Unit ED-203 Narrative

Department of Veterans Affairs

James A Haley VA Hospital, Tampa, FL

“Replace Air Handling Unit ED-203”

673-21-151

Project Location:

Tampa, FL 33612

Contract Number:

36C24819D0022 36C24822N0366

Contracting Officer (CO):

Cynda (Cindy) Rosa cynda.rosa@va.gov

Contracting Officer’s Representative (COR):

Paul Guerra

Paul.Guerra@va.gov

VA Tampa – Replace Air Handling Unit ED-203 Narrative

Table of Contents

I. Design Schedule

II. Architectural Narrative

III. Mechanical Narrative

a. Appendix C: Equipment Selections

IV. Electrical Narrative

V. Structural Narrative

VI. 95% Design Review Comments

1050 E. Southern Ave, Suite D, Tempe AZ 85282

480.454.2861, info@aesusdesign.com

A Service Disabled Veteran Owned Small Business

AE Replace Air Handling Unit ED‐203

Project Number: 673-21-151

James A. Haley VA Hospital, Tampa, FL 33612

Updated: 3/7/2023

NTP NTP/Kick Off Meeting 0 calendar days Thursday, March 31, 2022

Design Development

DD1 15% Submission

VA to Send Existing Drawings 1 calendar days Friday, April 1, 2022

On Site: Site Investigation 12 calendar days Wednesday, April 13, 2022

As Build Existing Building & Site Utilities

Virtual: DD1 Collaboration Meeting 7 calendar days Wednesday, April 20, 2022

Consultant Drawings Due to AESUS 5 calendar days Monday, April 25, 2022

DD1 Submission Due to VA 3 calendar days Thursday, April 28, 2022

Cost estimate to VA 7 days after submission 15% Submission Due NTP + 28 days

On Site: DD1 VA Review Meeting 13 calendar days Wednesday, May 11, 2022

DD2 30% Submission

Virtual: DD2 Collaboration Meeting 28 calendar days Wednesday, June 8, 2022

Consultant Drawings Due to AESUS 7 calendar days Wednesday, June 15, 2022

DD2 Submission Due to VA 7 calendar days Wednesday, June 22, 2022

Cost estimate to VA 7 days after submission 30% Submission Due NTP + 83 days

On Site: DD2 VA Review Meeting 14 calendar days Wednesday, July 6, 2022

Contract Documents

CD1 60% Submission

Begin Contract Document Stage 1 calendar days Thursday, July 7, 2022

Virtual: CD1 Collaboration Meeting 13 calendar days Wednesday, July 20, 2022

Consultant Drawings Due to AESUS 14 calendar days Wednesday, August 3, 2022

CD1 Submission Due to VA 7 calendar days Wednesday, August 10, 2022

Cost estimate to VA 7 days after submission 60% Submission Due NTP + 132 days

On Site: CD1 VA Review Meeting 14 calendar days Wednesday, August 24, 2022

CD2 90% Submission

Virtual: CD2 Collaboration Meeting 7 calendar days Wednesday, August 31, 2022

Consultant Drawings Due to AESUS 4 calendar days Sunday, September 4, 2022

CD2 Submission Due to VA 3 calendar days Wednesday, September 7, 2022

Cost estimate to VA 7 days after submission 90% Submission Due NTP + 160 days

On Site: CD2 VA Review Meeting 7 calendar days Wednesday, September 14, 2022

CD3 100% Submission

Consultant Drawings Due to AESUS 23 calendar days Friday, October 7, 2022

CD3 Submission Due to VA 8 calendar days Saturday, October 15, 2022

Cost estimate to VA 7 days after submission 100% Submission Due NTP + 198 days

On Site: CD3 Submission Review Meeting 5 calendar days Thursday, October 20, 2022

Contract Modification

CD3 100% Re-Submission

Modification Executed 132 calendar days Wednesday, March 1, 2023

Consultant Drawings Due to AESUS 21 calendar days Wednesday, March 22, 2023

CD3 Submission Due to VA 7 calendar days Wednesday, March 29, 2023

Cost estimate to VA 7 days after submission 100% Submission Due NTP + 356 days

Virtual: CD3 Submission Review Meeting 5 calendar days Monday, April 3, 2023

Bid Documents

Consultant Drawings Due to AESUS 7 calendar days Monday, April 10, 2023

Bid Submission Due to VA 7 calendar days Monday, April 17, 2023

Final Submission Due NTP + 375 days

VA Tampa – Replace Air Handling Unit ED-203 Architectural Narrative

AESUS Design Group A - 1

Architectural Narrative

Introduction

This project scope shall include but not be limited to replacing the Air Handler Unit ED-203 on the roof of Building One at the James A. Haley VA Hospital, located at 13000 Bruce B. Downs Boulevard, Tampa, Florida. This work will also include minor architectural, structural, mechanical, plumbing, and electrical.

In addition, this project shall include an Industrial Hygienist & a hazardous material remediation study.

The presence of hazardous material has been confirmed in the past in the hospital and is part of the scope to verify if hazardous material is present. OHC Environmental Engineering will visited the site and develop a work plans and specifications for this project as required for any hazardous material that is detected.

Demolition The project demolition will include removing the existing AHU, mechanical curbs, associated roofing, and the supply and return ducts will need to be upsized for the increased volume. See mechanical narrative for additional information.

Architectural The architectural scope for this project is limited to removing select ceilings, light fixtures, and mechanical grills to gain access to the bottom of the AHU and duct work located in the ceiling space of the emergency department. The architectural scope also includes coordinating and detailing the roof curbs and associated roof repairs.

The current AHU design intent is to remove the exist AHU and replace with new. The exist duct penetrations below the unit will be reused. The new AHU will be slightly raised up to allow the supply and return ducts to pass below the AHU and connect to the existing roof penetrations. We will provide a walking platform and stair for maintenance as part of the design. The walking platform will be integral with the AHU support. See attached drawings and structural for additional info.

Example walking platform and raised AHU:

AESUS Design Group A - 2

Structural The structural scope of work includes analyzing the existing structural capacity. Due to the new AHU requirements, the AHU will likely grow in size and weight. The new AHU will have a larger footprint and steel platform to distribute the additional loads.

Mechanical The mechanical scope is limited to removing and replacing the existing Air Handler Unit ED-203 and supply & return ducts over the emergency department. Therefore, the duct work and grills may be modified to support the new system and layout. See the mechanical narrative for additional information.

Plumbing General plumbing will not be required for this project.

Electrical The electrical scope is limited to disconnecting and reconnecting the existing AHU. Minor modifications to the existing electrical and low voltage may be required to support the new system.

The design intent will be to re-use the existing electrical circuit and reinstall all low voltage systems as required for the new layout.

Design Criteria All aspects of the design shall be in full compliance with VA design criteria as listed in VA design guides and manuals which can be found on the web at the VA Office of Facilities Management technical information library – site address: http://www.cfm.va.gov/TIL/.

The following codes and design criteria shall be utilized to the extent applicable:

VA Directives, Design Manuals, Master Specifications, VA National CAD Standard Application Guide, and other Guidance on the Technical Information Library (TIL) http://www.cfm.va.gov/til/.

International Building Code (IBC) (Only when specifically referenced in VA Design Documents, see notes below)

NFPA 101 Life Safety Code

NFPA National Fire Codes with the exception of NFPA 5000 and NFPA 900

Occupational, Safety and Health Administration (OSHA) Standards.

VA Seismic Design Requirements, H-18-8

National Electrical Code (NEC)

International Plumbing Code (IPC)

ASME Boiler and Pressure Vessel Code

ASME Code for Pressure Piping

Architectural Barriers Act Accessibility Standards (ABAAS) including VA supplement, Barrier Free Design Guide (PG-18-13)

Building Code Requirements for Reinforced Concrete, American Concrete Institute and Commentary (ACI 318)

Manual of Steel Construction, Load and Resistance Factor Design Specifications for Structural Steel Buildings, American Institute of Steel Construction (AISC)

Energy policy Act of 2005 (EPAct)

DOE Interim Final Rule: Energy Conservation Standards for New Federal, Commercial and Multi-Family High-Rise Residential Buildings and New Low-Rise Residential Buildings, 10 CFR Parts 433, 434 and 435.

Federal Leadership in High Performance and Sustainable Buildings: Memorandum of Understanding (MOU) http://www.cfm.va.gov/til/

AESUS Design Group A - 3

Executive Order 13423: Strengthening Federal Environmental, Energy, and Transportation Management.

The Provisions for Construction and Safety Signs. Stated in the General Requirements Section 01010 of the VA Master Construction Specification.

Ventilation for Acceptable Indoor Air Quality – ASHRAE Standard 62.1- 2004.

Safety Standard for Refrigeration Systems – ASHRAE Standard 15 – 2007.

Project Phasing Although this project will not ultimately affect life safety and/or egress, this project will need an in-depth discussion and phasing plan to understand how to keep hospital operations going when AHU ED-203 is offline. This project will include phasing to minimally impact the patient care and existing facility shutdowns. The contractor shall be required to perform construction operations during time frames approved by the hospital. Ultimately, the precise sequence will be determined after a building contractor has been selected and consultations among the hospital staff, facilities personnel, contractor, and architect can be arranged.

The following items shall be considered for this project prior to the start of construction:

Staging for construction materials and access information for contractor.

In-depth site walks with COR

Phasing and safety plans

Coordination drawing

Utilities/Outages

VA Tampa – Replace Air Handling Unit ED-203 Mechanical Narrative

AESUS Design Group MP-1

Introduction

This project scope shall include, but not be limited to the replacement of AHU ED-203 on the roof of

Building One at the James A. Haley VA Hospital, located at 13000 Bruce B. Downs Boulevard, Tampa.

Scope of Work

Replace AHU ED-203. The HVAC Systems need to be evaluated and updated to meet the latest HVAC Design Criteria. The A/E must evaluate the Chilled Water and the Hot Water / Steam System serving the design scope area.

Design Criteria

All aspects of the design shall be in full compliance with VA design criteria as listed in VA design guides and manuals which can be found on the web at the VA Office of Facilities Management technical information library – site address: http://www.cfm.va.gov/TIL/.

VA Directives, Design Manuals, Master Specifications, VA National CAD Standard Application Guide, and other Guidance on the Technical Information Library (TIL) http://www.cfm.va.gov/til/.

International Building Code (IBC) (Only when specifically referenced in VA Design Documents, see notes below)

NFPA 101 Life Safety Code

NFPA National Fire Codes with the exception of NFPA 5000 and NFPA 900

Occupational, Safety and Health Administration (OSHA) Standards.

VA Seismic Design Requirements, H-18-8

International Plumbing Code (IPC)

ASME Boiler and Pressure Vessel Code

ASME Code for Pressure Piping

Energy policy Act of 2005 (EPAct)

Ventilation for Acceptable Indoor Air Quality – ASHRAE Standard 62.1- 2004.

Safety Standard for Refrigeration Systems – ASHRAE Standard 15 – 2007.

Asbestos Containment

A hazardous survey is being conducted. There is likely to be asbestos in this area which potentially includes pipe or duct insulation. Refer to the Architectural/Asbestos narrative.

Demolition The project demolition work will include removing the existing AHU-ED-203 and associated ductwork.

See plans for detail

Mechanical Systems

Custom Outdoor AHU

A new AHU will be provided to serve the Emergency Department:

Total flow of 13,500 CFM

100% Outdoor Air

Pre-filter (MERV8, MERV11) http://www.cfm.va.gov/til/

AESUS Design Group MP-2

Pre-heat coil

Chilled Water o High Humidity and Dehumidification: Coil shall be equipped with electro-deposit coating (E-Coating) of 1-mil thick epoxy lining. Copper coils do not require any additional corrosion protection coatings. Coil velocity shall be maintained below 450 FPM to avoid condensate carry-over.

Humidification section utilizing building steam.

Supply Fans (6-total) with VFD, 30 HP Total, 480V-3Ph

Return Fans (6-total) with VFD, 18 HP Total, 480V-3Ph

Final filter (MERV17)

Air Changes

All rooms were verified for air changes and all either met or exceeded the minimum ACH per the VA Design Guide except for a corridor. See Below:

Room Number Room Name Area Volume ACH

Minimum

CFM

Actual CFM Check

1A-200 Entry 64 576 2 19.2 100 TRUE

1A-201 Waiting 414 3726 12 745.2 1800 TRUE

1A-203 Pre-Triage 93 837 6 83.7 150 TRUE

1A-206 Conf/Training 275 2475 6 247.5 540 TRUE

1A-207 RN Manager 117 1053 4 70.2 210 TRUE

1A-208 On Call 95 855 4 57 105 TRUE

1A-211 Staff Locker/Break 337 3033 4 202.2 510 TRUE

1A-213 Bereav/Counsel 78 702 4 46.8 100 TRUE

1A-214 EKG 80 720 6 72 85 TRUE

1A-215 Emergency Director 114 1026 4 68.4 115 TRUE

1A-217 Triage 3 117 1053 6 105.3 215 TRUE

1A-218 Triage 2 122 1098 6 109.8 215 TRUE

1A-219 Nurse Station 288 2592 6 259.2 415 TRUE

1A-220 Triage 1 117 1053 6 105.3 215 TRUE

1A-221 Unit Clerk 179 1611 6 161.1 345 TRUE

1A-222 Clean Linen 29 261 4 17.4 50 TRUE

1A-223 Secure Exam 122 1098 6 109.8 110 TRUE

1A-224 Clean Utility Equipment 220 1980 4 132 480 TRUE

1A-225 Mon Exam 15 129 1161 6 116.1 235 TRUE

1A-226 Mon Exam 14 130 1170 6 117 235 TRUE

1A-227 Mon Exam 13 125 1125 6 112.5 165 TRUE

1A-229 Mon Exam 12 125 1125 6 112.5 220 TRUE

1A-230 Mon Exam 11 126 1134 6 113.4 220 TRUE

1A-232 Mon Exam 10 126 1134 6 113.4 220 TRUE

1A-235 Mon Exam 9 126 1134 6 113.4 220 TRUE

1A-236 Procedure/Cast 227 2043 6 204.3 540 TRUE

1A-237 Mon Exam 8 127 1143 6 114.3 235 TRUE

1A-238 Clean Linen 20 180 4 12 50 TRUE

1A-239 Mon Exam 7 127 1143 6 114.3 235 TRUE

1A-241 Mon Exam 6 128 1152 6 115.2 195 TRUE

1A-242 EMT 64 576 6 57.6 110 TRUE

AESUS Design Group MP-3

1A-242a Meds 100 900 6 89.5 90 TRUE

1A-243 Mon Exam 5 128 1152 6 115.2 195 TRUE

1A-244 Mon Exam 4 128 1152 6 115.2 195 TRUE

1A-245 Radiography 279 2511 6 251.1 440 TRUE

1A-247 Mon Exam 3 129 1161 6 116.1 130 TRUE

1A-248 Vestibule 127 1143 2 38.1 100 TRUE

1A-249 Mon Exam 2 132 1188 6 118.8 120 TRUE

1A-250 Mon Exam 1 131 1179 6 117.9 120 TRUE

1A-253 PACS/Consult 75 675 6 67.5 155 TRUE

1A-254 Ambulance Storage 109 981 0 0 50 TRUE

1A-255 Decon 124 1116 0 0 90 TRUE

1A-256 Electrical 109 981 0 0 95 TRUE

C1-51-01 Corridor 396 3564 2 118.8 540 TRUE

C1-52-01 Corridor 545 4905 2 163.5 375 TRUE

C1-53-01 Corridor 363 3267 2 108.9 200 TRUE

C1-54-01 Corridor 370 3330 2 111 100 FALSE

C1-55-01 Corridor 131 1179 2 39.3 170 TRUE

C1-56-01 Corridor 206 1854 2 61.8 100 TRUE

C1-57-01 Corridor 669 6021 2 200.7 335 TRUE

Chilled water pumps – the chilled water pumps were analyzed will be replaced due to the Epidemic AHU requirements of 100% OA.

o Existing Pump Characteristics

200 GPM

50 feet of head o New Pump Characteristics

243 GPM

55 feet of head

Heating hot water pumps – the heating hot water pumps were analyzed will be replaced due to the Epidemic AHU requirements of 100% OA.

o Existing Pump Characteristics

40 GPM

50 feet of head o New Pump Characteristics

47.5 GPM

50 feet of head

Supply air main – Velocities were evaluated in the existing supply air duct system and the SA was verified to be undersized and will be replaced along with ancillary ductwork found to be undersized. Below is a figure of showing the velocity of the mains

AESUS Design Group MP-4

Return air main - Velocities were evaluated in the existing return air duct system and the RA was verified to be properly sized. Below is a figure of showing the velocity of the main.

AESUS Design Group MP-5

Exhaust system o The dedicated exhaust system is existing to remain. The exhaust rates of each room are not being changed, therefore, there is no need to replace the exhaust fans.

o The new AHU has a dedicated return/exhaust fan that is capable of exhausting the air when the unit converts to 100% OA in the event of a pandemic.

Chilled water system – The chilled water system was analyzed and determined to be sized appropriately for the new 100% OA requirement.

Heating hot water system – The heating hot water system was analyzed and determined to be sized appropriately for the new 100% OA requirement. We reached out to the manufacturer and it was indicated that the existing heat exchangers have the capacity to perform at the new levels without any modifications. The existing heat exchanger are existing to remain.

Humidification – The humidification will be provided by campus steam.

Plumbing

Condensate drains will be routed from new AHU to existing roof drain.

AESUS Design Group MP-6

Appendix D: Equipment Selections

Job Information Technical Data Sheet

Job Name VA Tampa

Date March 09 2023

Submitted By JS

Software Version 13.04

Unit Tag AHU-1

Unit Overview

Model Number

Supply Return/Exhaust

Air

Volume cfm

Static Pressure External Dimensions Air

Volume cfm

Static Pressure External Dimensions

External inWc

Total inWc

Height in

Width in

Length in

External inWc

Total inWc

Height in

Width in

Length in

CAH039GDCM 13500 2.00 5.29 102* 72* 404** 7000 2.00 2.06 102* 72* 404**

*Not including base rails, coil connectors, drain connectors and control boxes.

**The supply and return lengths display total unit length (not including hoods).

Unit

Model Number: CAH039GDCM

Approval: ETL Listed / ETL Listed to Canadian Safety Standards (ETL Label / ETLc Label)

Outer Panel: Painted 24 gauge G60 Galvanized Steel

Liner: 24 gauge Galvanized Steel (unless noted per section)

Insulation: R-13 Injected Foam

Unit Configuration: Inline horizontal Drive (Handling) Location: Left

Base: 10" formed channel Wall Thickness: 2 in

Altitude: 0 ft Parts Warranty: Standard One Year

Exhaust Air Stream

Plenum Section Component: 1 Length: 52 in Shipping Section: 1

Air Pressure Drop

0.02 inWc

Custom Openings

Custom Opening Location Width Height Rainhood w/Screen

1 Bottom 68 in 24 in None

Door

Location Width Opening

Drive side 30 in Outward

Return/Exhaust Fan Array Component: 2 Length: 24 in Shipping Section: 1

Fan Performance

Air

Volume*

Static Pressure Fan Energy

Index(FEI)

Total Input

Power

Fan Shaft

Power*

Speed Redundancy(N-1) Fan Circuit

External Total Cabinet Operating Maximum MOP MCA

2333 cfm 2.00 inWc 2.06 inWc 0.00 inWc 1.72 2.7 kW 1.10 BHP 2229 rpm 3300 rpm 100.0 % 15.0 A 14.6 A

Fan Data

Fan Type Blade Type / Class Quantity of Fans Wheel Diameter Number of Blades Discharge Motor Location

ECM / 2x2 : 3 Airfoil / N/A 3 13.98 in 5 Axial Behind Fan

Motor Data

Power* Electrical Supply Speed Control Signal Full Load Current*

4.4 HP 460/60/3 V/Hz/Phase 3300 rpm 0-10V 4.50 A

Fan Options

Piezometer Ring: 1 ring per array Piezometer Delta P: 2.89

Transducer:

Output signal = 4-20 mA Input power = 10-35 VDC or 16-26

VAC

Isolator Type: Rigid

Control Data

Selection Type: Integrated Drive Vendor: Daikin Applied

Auxiliary Control: Disconnect w/ motor starter Voltage: 460 V

Disconnect Type: Fused Height x Width x Depth: 23.60 in x 15.75 in x 10.76 in

Mounting: Drive Side Enclosure: NEMA 3R

Control box: Basic controls, unit mounted power box, drive side

Panel

Location Width Opening

Removable panels - in Outward

Notes

* after a unit label denotes the data for an individual fan.

Access Section Component: 3 Length: 30 in Shipping Section: 1

Air Pressure Drop

0.00 inWc

Door

Location Width Opening

Drive side 26 in Outward

Special Options

Tread Plate Floor Liner Sound Baffle

Tread plate installed (As casing details)

Economizer Component: 4 Length: 40 in Shipping Section: 2

Portion Damper Blade Action Rated CFM Air Pressure

Drop

Quantity

Size (length x width) Location Type Actuation

Overall Opening

Outside Air 36 in x 92 in 32 in x 82 in Right UltraSeal

Low Leak NA Parallel 13500 cfm 0.04 inWc 1

Return Air 18 in x 92 in 14 in x 82 in Internal UltraSeal

Low Leak NA Parallel 7000 cfm 0.06 inWc 1

Exhaust Air 22 in x 92 in 18 in x 82 in Left UltraSeal

Low Leak NA Parallel 7000 cfm 0.03 inWc 1

VXTZ56 VA Tampa 2 3/9/2023

Supply Air Stream

Access Section Component: 1 Length: 24 in Shipping Section: 2

Air Pressure Drop

0.00 inWc

Door

Location Width Opening

Drive side 20 in Outward

Combination Filter Component: 2 Length: 16 in Shipping Section: 2

Access Face Velocity Face Area Air Volume

Side 314 ft/min 42.9 13500 cfm

Portion Type Efficiency Air Pressure Drop Number of

Filters

Height Width Depth

Clean Air Mean Air Dirty Air User Spec

Pre-Filter Pleated MERV 8 0.12 inWc 0.56 inWc 1.00 inWc N/A 8 24 in 24 in 2 in

4 24 in 20 in 2 in

Filter Pre Pleat MERV 13 0.12 inWc 0.56 inWc 1.00 inWc N/A 8 24 in 24 in 4 in

4 24 in 20 in 4 in

Door

Location Width Opening

Drive side 12 in Outward

Special Options

Sound Baffle Pre-Filter Gauge Final-Filter Gauge

(As casing details) Magnehelic Magnehelic

Future Chilled Water Coil Component: 3 Length: 42 in Shipping Section: 2

Number of Coils Number of Rows

2 2 Coil Air Pressure Drop Finned Height Finned Width Face Area Face Velocity

0.05 inWc 45 in 59 in 36.88 366 ft/min

Connection Location Connection Material

Drive side Carbon steel Coil Model Drain Pan Drain Pan Side

Future Coil (Not Supplied) Stainless steel Opp drive side

AHRI 410 Certification

Coil is NOT certified by AHRI

Door

Location Width Opening

Drive side 26 in Outward

Special Options

Liner Sound Baffle

24 gauge Stainless Steel (As casing details)

VXTZ56 VA Tampa 3 3/9/2023

Hot Water Coil Component: 4 Length: 12 in Shipping Section: 2

Coil Model Total Capacity Number of Coils Number of Rows Fins per Inch Tube Diameter Tube Spacing

(Face x Row)

5WQ0801C 435870 Btu/hr 2 1 8 0.625 in 1.50 in x 1.299 in

Air Volume Air Temperature Coil Air Pressure

Drop

Finned Height Finned Length Face Area Face Velocity

Entering Leaving

Dry Bulb Dry Bulb

13500 cfm 34.8 64.3 0.10 inWc 42 in 56 in 32.67 413 ft/min

Water Flow Rate Pressure Drop Velocity Volume Weight

Entering Leaving

150.0 119.4 28.40 gpm 2.80 ftHd 2.20 ft/s 8.0 gal 70.00 lb

Connection [Data Per Coil] Min. Fin Surface

Temp.

Min. Tube Wall

Surface Temp.

Fouling Factor

Type Size Location Material

Threaded 1.50 in Drive side Carbon steel 119.4 119.4 0.000

Material Drain Pan Drain Side Electro-Fin Coat

Fin Tube Header Case

Aluminum .0075 in Copper .020 in Copper Galv. steel Stainless steel Opp drive side With coating

AHRI 410 Certification

Coil is NOT certified by AHRI

Chilled Water Coil Component: 5 Length: 54 in Shipping Section: 3

Coil Model Total Capacity Sensible Capacity Number of Coils Number of Rows Fins per Inch Tube Diameter Tube Spacing

(Face x Row)

5WS1106C 1244568 Btu/hr 622439 Btu/hr 2 6 11 0.625 in 1.50 in x 1.299 in

Air Volume Air Temperature Coil Air

Pressure

Drop

Finned

Height

Finned

Length

Face Area Face

VelocityEntering Leaving

Dry Bulb Wet Bulb Dry Bulb Wet Bulb

13500 cfm 92.4 77.4 50.2 50.0 0.80 inWc 45 in 59 in 36.88 366 ft/min

Water Flow Rate Pressure Drop Velocity Volume Weight

Entering Leaving

42.0 52.0 247.80 gpm 11.70 ftHd 4.40 ft/s 31.0 gal 263.00 lb

Connection [Data Per Coil] Min. Fin Surface

Temp.

Min. Tube Wall

Surface Temp.

Fouling Factor

Type Size Location Material

Threaded 3.00 in Drive side Carbon steel 42.0 42.0 0.000

Material Drain Pan Drain Side Electro-Fin Coat

Fin Tube Header Case

Aluminum .0075 in Copper .020 in Copper Galv. steel Stainless steel Opp drive side With coating

AHRI 410 Certification

Coil is NOT certified by AHRI

Door

Location Width Opening

Drive side 30 in Outward

VXTZ56 VA Tampa 4 3/9/2023

Supply Fan Array Component: 6 Length: 24 in Shipping Section: 3

Fan Performance

Air

Volume*

Static Pressure Fan Energy

Index(FEI)

Total Input

Power

Fan Shaft

Power*

Speed Redundancy(N-1) Fan Circuit

External Total Cabinet Operating Maximum MOP MCA

2700 cfm 2.00 inWc 5.29 inWc 0.00 inWc 1.46 13.3 kW 3.23 BHP 3162 rpm 3300 rpm 96.4 % 25.0 A 23.6 A

Fan Data

Fan Type Blade Type / Class Quantity of Fans Wheel Diameter Number of Blades Discharge Motor Location

ECM / 3x2 : 5 Airfoil / N/A 5 13.98 in 5 Axial Behind Fan

Motor Data

Power* Electrical Supply Speed Control Signal Full Load Current*

4.4 HP 460/60/3 V/Hz/Phase 3300 rpm 0-10V 4.50 A

Fan Options

Piezometer Ring: 1 ring per array Piezometer Delta P: 3.88

Transducer:

Output signal = 4-20 mA Input power = 10-35 VDC or 16-26

VAC

Isolator Type: Rigid

Control Data

Selection Type: Integrated Drive Vendor: Daikin Applied

Auxiliary Control: Disconnect w/ motor starter Voltage: 460 V

Disconnect Type: Fused Height x Width x Depth: 23.60 in x 15.75 in x 10.76 in

Mounting: Drive Side Enclosure: NEMA 3R

Control box: Basic controls, unit mounted power box, drive side

Panel

Location Width Opening

Removable panels - in Outward

Notes

* after a unit label denotes the data for an individual fan.

Access Section Component: 7 Length: 30 in Shipping Section: 3

Air Pressure Drop

0.00 inWc

Door

Location Width Opening

Drive side 26 in Outward

Special Options

Tread Plate Floor Liner Sound Baffle

Tread plate installed (As casing details)

Combination Filter Component: 8 Length: 20 in Shipping Section: 3

Access Face Velocity Face Area Air Volume

Front 397 ft/min 34.0 13500 cfm

Portion Type Efficiency Air Pressure Drop Number of

Filters

Height Width Depth

Clean Air Mean Air Dirty Air User Spec

Filter HEPA

MERV 17

(99.97%)

1.07 inWc 1.93 inWc 2.80 inWc N/A

6 24 in 24 in 12 in

3 24 in 12 in 12 in

2 12 in 24 in 12 in

Special Options

Sound Baffle Filter Gauge

(As casing details) Magnehelic 0-5"

VXTZ56 VA Tampa 5 3/9/2023

Plenum Section Component: 9 Length: 36 in Shipping Section: 4

Air Pressure Drop

0.09 inWc

Custom Openings

Custom Opening Location Width Height Rainhood w/Screen

1 Bottom 68 in 24 in None

Door

Location Width Opening

Drive side 28 in Outward

Unit Sound Power (dB)

Type 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz

Radiated: 69 63 73 60 58 50 46 51

Unit Discharge: 70 65 80 69 67 63 56 51

Unit Return: 69 63 73 60 58 55 56 55

Shipping Section Details

Section Length in

Weight lb

Corner Weights (lb) Center of Gravity (in)

P1 P2 P3 P4 XX YY ZZ

1 106 1822 424 443 487 468 56 37 48

2 134 2268 489 496 645 638 76 36 50

3 128 3548 1082 1144 692 630 48 37 51

4 36 566 142 142 142 142 18 36 49

Entire Unit 404 8204 1888 1977 2214 2125 214 37 50

NOTE: Special components aren't included in the corner weights and center of gravity data.

Supply Static Pressure Drop

Component Option Static Pressure Drop

Economizer Damper 0.06 insWg

Access Section Access Section

Panel and Bag Filter Panel and Bag Filter 1.12 insWg

Chilled Water coil Chilled Water coil 0.05 insWg

Hot Water Coil Hot Water Coil 0.10 insWg

Chilled Water coil Chilled Water coil 0.80 insWg

Supply Fan Cabinet

Access Section Access Section

Panel and Bag Filter Panel and Bag Filter 1.07 insWg

Plenum Section Plenum Section 0.09 insWg

External Static External Static 2.00 insWg

Total Supply Fan Static 5.29 insWg

VXTZ56 VA Tampa 6 3/9/2023

Exhaust Static Pressure Drop

Component Option Static Pressure Drop

Plenum Section Plenum Section 0.02 insWg

Return Fan Cabinet

Access Section Access Section

Economizer Damper 0.03 insWg

External Static External Static 2.00 insWg

Total Return/Exhaust Fan Static 2.06 insWg

Minimum Recommended Drain Pan Trap Dimensions

Shipping Section Component H

2 Chilled Water coil 2.46

2 Hot Water Coil 2.66

3 Chilled Water coil 4.26

Dimensions provided as a courtesy and are recommended minimums only. Daikin is not responsible for supplying or designing drain pan traps and is not responsible for any damage caused by incorrect trap heights. The dimensions listed above should be reviewed and approved by a licensed plumbing professional.

AHRI Certification

The air-handler is selected outside of the scope of AHRI Standard 430/431

Notes

Standard

1. As a standalone component, unit meets or exceeds requirements of ASHRAE 90.1 - 2007. The approving authority is responsible for compliance of multi - component building systems.

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PART 1: GENERAL

1.01 SECTION INCLUDES

A. Indoor Air Handling Units.

1.02 REFERENCES

A. AFBMA 9 - Load Ratings and Fatigue Life for Ball Bearings.

B. AMCA 99 - Standards Handbook.

C. AMCA 210 - Laboratory Methods of Testing Fans for Rating Purposes.

D. AMCA 300 - Test Code for Sound Rating Air Moving Devices.

E. AMCA 500 - Test Methods for Louver, Dampers, and Shutters.

F. AHRI 410 - Forced-Circulation Air-Cooling and Air-Heating Coils.

G. AHRI 430 - Central-Station Air-Handling Units.

H. AHRI 435 - Application of Central-Station Air-Handling Units.

I. ASTMB117 - Standard Practice for Operating Salt Spray Apparatus.

J. NEMA MG1 - Motors and Generators.

K. NFPA 70 - National Electrical Code.

L. SMACNA - HVAC Duct Construction Standards - Metal and Flexible.

M. UL 723 - Test for Surface Burning Characteristics of Building Materials.

N. UL 900 - Test Performance of Air Filter Units.

O. UL 1995 - Standard for Heating and Cooling Equipment.

P. UL 94 - Test for Flammability of Plastic Materials for Parts in Devices and Appliances.

Q. IBC 2000, 2003 - International Building Code.

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

S. NFPA 5000 - Building Construction and Safety Code.

T. ASHRAE 90.1 Energy Code.

U. AHRI Standard 1060 - Rating Air-to-Air Heat Exchangers for Energy Recovery Ventilation Equipment.

V. GSA 2003 Facilities Standard - 5.9 HVAC Systems and Components.

1.03 SUBMITTALS

A. Shop Drawings: Indicate assembly, unit dimensions, weight loading, required clearances, construction details, field connection details, and electrical characteristics and connection requirements. Computer generated fan curves for each air handling unit shall be submitted with specific design operating point noted. A computer generated psychometric chart shall be submitted for each cooling coil with design points and final operating point clearly noted. Sound data for discharge, radiated and return positions shall be submitted by octave band for each unit. Calculations for required baserail heights to satisfy condensate trapping requirements of cooling coil shall be included.

B. Product Data:

1. Provide literature that indicates dimensions, weights, capacities, ratings, fan performance, finishes of materials, electrical characteristics, and connection requirements.

2. Provide data of filter media, filter performance data, filter assembly, and filter frames.

3. Provide manufacturer's installation instructions.

1.04 QUALIFICATIONS

A. Manufacturer: Company specializing in manufacturing Air Handler products specified in this section must show a minimum five years documented experience and complete catalog data on total product.

1.05 SAFETY AGENCY LISTED & CERTIFICATION

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A. Air Handling units shall be cETLus safety listed to conform with UL Standard 1995 and CAN/CSA Standard

C22.2 No. 236. Units shall be accepted for use in New York City by the Department of Building, MEA 342-99-E.

B. Air handler furnished with double width, double inlet (DWDI) fans and/or plenum fans where applicable, shall be certified in accordance with the central station air handling units certification program, which is based on AHRI Standard 430. (NOTE: Above does not apply to fan array)

C. Air handling unit water heating & cooling coils shall be certified in accordance with the forced circulation air cooling and air heating coils certification program, which is based on AHRI Standard 410.

1.06 DELIVERY, STORAGE, AND HANDLING

A. Deliver, store, protect and handle products to site.

B. Accept products on site on factory-furnished shipping skids. Inspect for damage.

C. Store in clean dry place and protect from construction traffic. Handle carefully to avoid damage to components, enclosures, and finish.

PART 2: PRODUCTS

2.01 ACCEPTABLE MANUFACTURERS

A. The following manufacturers are approved for use. No substitutions will be permitted.

1. Daikin Applied 'Vision' Air Handler shall be the basis of design.

2. Miller-Picking

3. Temtrol

4. Scott-Springfield

5. Racan-Carrier Company

2.02 GENERAL DESCRIPTION

A. Configuration: Fabricate as detailed on drawings.

B. Performance: Conform to AHRI 430. See schedules on prints. (NOTE: above does not apply to fan array)

C. Acoustics: Sound power levels (dB) for the unit shall not exceed the specified levels shown on the unit schedule. The manufacturer shall provide the necessary sound treatment to meet these levels if required.

2.03 UNIT CONSTRUCTION

A. Fabricate unit with heavy gauge channel posts and panels secured with mechanical fasteners. All panels, access doors, and ship sections shall be sealed with permanently applied bulb-type gasket. Shipped loose gasketing is not allowed.

B. Panels and access doors shall be constructed as a 2-inch nominal thick; thermal broke double wall assembly, injected with foam insulation with an R-value of not less than R-13.

1. The inner liner shall be constructed of G90 galvanized steel.

2. Exterior surfaces shall be constructed of painted galvanized steel, for aesthetics and long-term durability.

Paint finish will include a base primer with a high-quality polyester resin topcoat. Finished, unabraded panel surfaces shall be exposed to an ASTM B117 salt spray environment and exhibit no visible red rust at a minimum of 3,000 hours exposure. Finished, abraded surfaces shall be tested per ASTM D1654, having a environment. Measurements of results shall be quantified using ASTM D1654 in conjunction with ASTM

D610 and ASTM D714 to evaluate blister and rust ratings.

3. The floor plate shall be constructed as specified for the inner liner.

4. Unit will be furnished with solid inner liners.

C. Panel deflection shall not exceed L/240 ratio at 125% of design static pressure, maximum 5 inches of positive or 6 inches of negative static pressure. Deflection shall be measured at the panel midpoint.

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D. The casing leakage rate shall not exceed 0.50 cfm per square foot of casing surface area at design static

(.0025 m3/s per square meter of cabinet area at 1.24 kPa static pressure)

E. Module to module field assembly shall be accomplished with an overlapping, full perimeter internal splice joint that is sealed with bulb type gasketing on both mating modules to minimize on-site labor and meet indoor air quality standards.

F. Access doors shall be flush mounted to cabinetry, with minimum of two six inch long stainless steel piano-type hinges, latch and full size handle assembly. Access doors shall swing outward for unit sections under negative pressure. Access doors on positive pressure sections, shall have a secondary latch to relieve pressure and prevent injury upon access.

G. A 10-inch formed G60 galvanized steel base rail shall be provided by the unit manufacturer for structural rigidity and condensate trapping.. The base rail shall be constructed with 12-gauge nominal for unit sizes 003 -

035 and 10-gauge nominal for unit sizes 040 - 090. The following calculation shall determine the required height of the baserail to allow for adequate drainage. Use the largest pressure to determine base rail height.

factory supplied at this height, the contractor is required to supply a concrete housekeeping pad to make up the difference.

H. Construct drain pans from stainless steel with cross break and double sloping pitch to drain connection.

base rail to aid in proper condensate trapping. Drain connections that protrude from the base rail are not

2.04 FAN ASSEMBLIES

A. Provide ECM, motorized impeller fan(s). Fan assembly shall include fan, fan base, and a motor and shall be dynamically balanced by the fan manufacturer.

1. Fan array shall be equipped with a piezometer point to measure airflow. One piezometer point shall be supplied on one fan in the fan array.

2. Motor control panel shall come with a low voltage terminal strip and shall include terminals for Fan

ON/OFF, 0-10V signal, and fan fault.

3. Motor control panel shall come equipped with a fused disconnect.

4. Fan section shall come equipped with a motor control panel mounted on the fan section. Both line voltage and low voltage wiring shall be done by the factory. Each fan shall have an isolation switch.

5. Motor shall be brushless DC type with a permanent magnet rotor.

6. Inverter shall be integral to the motor and come as an assembly from the fan manufacturer.

2.05 BEARINGS, SHAFTS, AND DRIVES

A. Shafts shall be solid, hot rolled steel, ground and polished, keyed to shaft, and protectively coated with lubricating oil. Hollow shafts are not acceptable.

2.06 ELECTRICAL

A. The air handler(s) shall be ETL and ETL-Canada listed by Intertek Testing Services, Inc. Units shall conform to bi-national standard ANSI/UL Standard 1995/CSA Standard C22.2 No. 236.

B. Wiring Termination: Provide terminal lugs to match branch circuit conductor quantities, sizes, and materials indicated. Enclosed terminal lugs in terminal box sized to NFPA 70.

C. Manufacturer shall provide ASHRAE 90.1 Energy Efficiency equation details for individual equipment to assist Building Engineer for calculating system compliance.

D. Installing contractor shall provide GFI receptacle within 25 feet of unit to satisfy National Electrical Code requirements.

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2.07 COOLING AND HEATING COILS

A. Certification: Acceptable water cooling, water heating, steam, and refrigerant coils shall be certified in manufacturer is a current member of the AHRI Forced Circulation Air-Cooling and Air-Heating Coils certification programs and that the coils have been rated in accordance with AHRI Standard 410. Manufacturer must be

ISO 9002 certified.

B. Water cooling coil shall be provided. Provide access to coil(s) for service and cleaning. Enclose coil headers and return bends fully within unit casing. Unit shall be provided with coil connections that extend a minimum casing. Coil connections must be factory sealed with grommets on interior and exterior panel liners to minimize air leakage and condensation inside panel assembly. If not factory packaged, Contractor must supply all coil connection grommets and sleeves. Coils shall be removable through side and/or top panels of unit without the need to remove and disassemble the entire section from the unit.

1. Headers shall consist of seamless copper tubing to assure compatibility with primary surface. Headers to have intruded tube holes to provide maximum brazing surface for tube to header joint, strength, and inherent flexibility. Header diameter should vary with fluid flow requirements.

2. Fins shall have a minimum thickness of 0.0075 inch aluminum plate construction. Fins shall have full drawn collars to provide a continuous surface cover over the entire tube for maximum heat transfer. Tubes shall be mechanically expanded into the fins to provide a continuous primary to secondary compression bond over the entire finned length for maximum heat transfer rates. Bare copper tubes shall not be visible between fins.

3. Coil tubes shall be 5/8 inch OD seamless copper, 0.020 inch nominal tube wall thickness, expanded into fins, brazed at joints.

4. Coil connections shall be carbon steel, NPT threaded connection. Connection size to be determined by manufacturer based upon the most efficient coil circuiting. Vent and drain fittings shall be furnished on the connections, exterior to the air handler. Vent connections provided at the highest point to assure proper venting. Drain connections shall be provided at the lowest point to insure complete drainage and prevent freeze-up.

5. Coil casing shall be a formed channel frame of galvanized steel.

C. Water heating coil shall be provided. Provide access to coil(s) for service and cleaning. Enclose coil headers and return bends fully within unit casing. Unit shall be provided with coil connections that extend a minimum casing. Coil connections must be factory sealed with grommets on interior and exterior panel liners to minimize air leakage and condensation inside panel assembly. If not factory packaged, Contractor must supply all coil connection grommets and sleeves. Coils shall be removable through side and/or top panels of unit without the need to remove and disassemble the entire section from the unit.

1. Headers shall consist of seamless copper tubing to assure compatibility with primary surface. Headers to have intruded tube holes to provide maximum brazing surface for tube to header joint, strength, and inherent flexibility. Header diameter should vary with fluid flow requirements.

2. Fins shall have a minimum thickness of 0.0075 inch aluminum plate construction. Fins shall have full drawn collars to provide a continuous surface cover over the entire tube for maximum heat transfer. Tubes shall be mechanically expanded into the fins to provide a continuous primary to secondary compression bond over the entire finned length for maximum heat transfer rates. Bare copper tubes shall not be visible between fins.

3. Coil tubes shall be 5/8 inch OD seamless copper, 0.020 inch nominal tube wall thickness, expanded into fins, brazed at joints.

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4. Coil connections shall be carbon steel, threaded connection. Connection size to be determined by manufacturer based upon the most efficient coil circuiting. Vent and drain fittings shall be furnished on the connections, exterior to the air handler. Vent connections provided at the highest point to assure proper venting. Drain connections shall be provided at the lowest point to insure complete drainage and prevent freeze-up.

5. Coil shall be furnished as an uncased galvanized steel to allow for thermal movement and slide into a pitched track for fluid drainage.

2.08 FILTERS

A. Furnish combination filter section with 2-inch pleated MERV 8 flat pre-filter and 4-inch final filter. Provide side loading and removal of filters.

B. Furnish combination filter section with flat pre-filter and 12-inch HEPA final filter. Provide front loading and removal of filters.

C. Filter media shall be UL 900 listed, Class I or Class II.

D. Filter Magnehelic gauge(s) shall be furnished and mounted by equipment manufacturer.

2.09 ADDITIONAL SECTIONS

A. Plenum section shall be provided and properly sized for inlet and/or discharge air flow (between 600 and

1500 feet per minute). The plenum shall provide single or multiple openings as shown on drawings and project schedule.

B. Access section shall be provided for access between components.

C. Economizer section shall be provided with right side outside air opening and end return air opening and left side exhaust air opening with or without parallel low leak airfoil damper blades. Dampers shall be hollow core galvanized steel airfoil blades, fully gasketed and have continuous vinyl seals between damper blades in a galvanized steel frame. Dampers shall have stainless steel jamb seals along end of dampers. Linkage and ABS plastic end caps shall be provided when return and outside air dampers sized for full airflow. Return and outside air dampers of different sizes or very large dampers and exhaust dampers must be driven separately.

Damper Leakage: Leakage rate shall be less than two tenths of one percent leakage at 2 inches static pressure differential. Leakage rate tested in accordance with AMCA Standard 500.

PART 3: EXECUTION

3.01 INSTALLATION

A.

3.02 ENVIRONMENTAL REQUIREMENTS

A. Do not operate units for any purpose, temporary or permanent, until ductwork is clean, filters are in place, bearings lubricated, and fan has been test run under observation.

3.03 EXTRA MATERIALS

A. Provide [one, two, etc.] extra set(s) [fan belts, filters, etc.] for each unit as shown on project schedule.

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VA Tampa – Replace Air Handling Unit ED-203 Electrical Narrative

AESUS Design Group E - 1

Electrical Narrative

Introduction

This project scope shall include, but not be limited to the replacement of AHU ED-203 and associated pumps of Building One at the James A. Haley VA Hospital, located at 13000 Bruce B.

Downs Boulevard, Tampa.

General Design Guidelines

The following guidelines shall establish the basic standards of construction for the work associated with this project.

All work described herein shall conform to the National Electric Code (NEC) – NFPA 70, The International Building Code, The Health Care Facilities Code, NFPA 99, The Life Safety Code, NFPA 101, The International Energy Conservation Code, and VA design guidelines.

Project Scope

The electrical portion of this work shall include, but not be limited to the following:

Coordinate electrical load study as necessary to verify the existing electrical load demand on the existing electrical distribution system.

Demolish the following:

o Air handling unit AHU-ED-203.

o Hot water pumps HWP-1 & HWP-2 and starters.

o Chilled water pumps CWP-9 & CWP-10 and starters.

Provide new variable frequency drives to serve new hot and chilled water pumps.

Utilize existing circuit breaker in distribution board “EQER1” to feed new AHU-ED-203, HWP-1, HWP-2, CWP-9 & CWP-10.

Utilize existing circuit breaker in panelboard “EQERL1” to feed 120V circuit for AHU lighting & maintenance receptacle.

Relocate existing VAV box per mechanical plans.

The replacement of AHU ED-203 and associated pumps shall add 39.1 amperes of electrical load to the associated electrical distribution system. Existing electrical loads shown on plans are per existing drawings, project #673-318, dated 2004.08.05.

Furthermore, the following shall apply to the areas in scope:

Electrical Service and Distribution:

All existing electrical service and distribution are to remain “as-is” unless noted otherwise.

Additions or modification to any panel or service will be documented.

No additional backup, standby or emergency power will be required. Existing egress or emergency lighting will be reconnected or modified as needed.

VA Tampa – Replace Air Handling Unit ED-203 Electrical Narrative

AESUS Design Group E - 2

Branch Wiring:

Branch wiring system will be installed in accordance with 2020 NEC. Each branch circuit will utilize a dedicated neutral conductor. All branch circuits shall utilize an equipment grounding conductor in each conduit. The conduit will not be allowed to be used as the sole grounding path.

All branch circuiting will be copper conductors in conduit. Minimum conduit size will be 3/4”.

MC Cable will be allowed to be used for normal power circuits from a junction box in the ceiling space in a room to devices located in the walls. The MC cable is to be concealed in the walls.

MC is not to be used for homeruns or for emergency circuits.

Typical branch circuit wiring will be minimum #12 AWG CU, installed in EMT conduit for power and lighting systems. Rigid conduits shall be used for all exposed conduit runs where EMT would be subject to physical damage as defined by the National Electrical Code (NEC). Conduits to be installed concealed, except where installed in electrical rooms, mechanical rooms or other unfinished areas.

All empty conduits shall have a pull string installed in them.

All panelboard feeders shall be copper conductors installed in conduits.

All electrical equipment shall be bonded with a dedicated equipment grounding conductor.

Power for Mechanical Equipment:

Power for Mechanical Equipment wiring systems will be installed in accordance with 2020 NEC.

Each branch circuit will utilize a dedicated neutral conductor as needed. All branch circuits shall utilize an equipment grounding conductor in each conduit. The conduit will not be allowed to be used as the sole grounding path.

All branch circuiting will be copper conductors in conduit. Minimum conduit size will be 3/4”.

Wiring Devices:

Wiring Devices shall be duplex receptacles rated for 120V with 5-20 NEMA configuration, nylon type, with finishes determined by architect. Device faceplates shall be thermoplastic.

Interior receptacles located within 6 feet of a water source shall be provided with GFCI.

Wiring devices to be mounted in 4” square x 2-1/8” deep minimum boxes with appropriate gang mud ring.

Where wiring devices are surface mounted or in unfinished areas, devices to be mounted in a 4” square outlet box with matching industrial raised cover plates.

Device wall plates to have extra strength laminated adhesive tape labels indicating the source panel and circuit number. Tape to be clear with back letters.

Receptacles shall have the following finish:

o Normal = White o Life Safety / Emergency = Red

Receptacle cover plate to match color of receptacle

Receptacles to be installed in accordance with the electrical drawings.

VA Tampa – Replace Air Handling Unit ED-203 Structural Narrative

AESUS Design Group S - 1

Structural Narrative

Introduction

The scope of work will involve replacing the existing Air Handler Unit ED-203 that is located on the roof of Building One at the James A. Haley VA Hospital in Tampa, Florida. The structural scope includes an analysis of the existing roof structure to determine whether the existing roof structure can adequately support the larger AHU (increased size in both weight and dimensionally).

Structural Scope

In order to offset the increase of unit weight, the intent of the design is to remove the existing concrete housekeeping pad (6” of normal-weight concrete placed directly on the 1-1/2” x 20 gage steel roof deck ~90 psf) while leaving the roof penetrations as-is to accommodate the currently in-use ductwork. The mechanical unit will be placed on a pre-manufactured roof curb and fastened to the roof structure per the manufacturer installation instructions.

The structural analysis of the existing roof members supporting the new mechanical unit utilized existing structural drawings prepared by Allan and Conrad, Inc. dated 1/28/2005. The existing drawings indicate the existing unit and housekeeping pad is supported on W16x40 wide flange roof members spanning to a W24x55 wide flange girder to the north and a W18x35 wide flange girder and masonry bearing wall to the south. The new mechanical unit weight is 18,024 lbs or 89 psf. By comparison, the new unit weight is less than the existing concrete pad weight which is being removed. However, an analysis of the steel beams and girders was also performed to validate the structural member adequacy.

With the existing concrete pad being cast directly on the existing 1-1/2” x 20 gage steel roof deck, it is presumed that…