Attach_1_SOW_Replace_Existing_Variable_Refrigerant_Flow_(VRF)_B503_V3.pdf

Solicitation FA4497-19RA-032 Attachment 1

STATEMENT OF WORK

REPLACE BUILDING 503 HVAC

PROJECT NUMBER 1076659

13 MAY 2019

ii

TABLE OF CONTENTS

PARTS:……………………………………………………………………......………………..PAGE

PART I – PROJECT SPECIFIC GUIDANCE

1. SCOPE

1.1. PERIOD OF PERFORMANCE

1.2. OBJECTIVE…………………………………………………………………………………..1

1.3. LIMITATIONS

2. POINTS OF CONTACT

3. GOVERNMENT-FURNISHED INFORMATION

PART II – GENERIC REQUIREMENTS

1. GOVERNING DESIGN AND CONSTRUCTION DOCUMENTS

2. DESIGN REQUIREMENTS

3. CONSTRUCTION REQUIREMENTS

4. CONTRACT ADMINISTRATION REQUIREMENTS

5. SECURITY

6. APPENDIX A……………………………………………………………………………

7. APPENDIX B …………………………………………………………………………………..12

PART I – PROJECT SPECIFIC GUIDANCE

1. SCOPE

1.1. PERIOD OF PERFORMANCE: Total period of performance for this project is

180 days (negotiable).

1.2. OBJECTIVE: This project will remove the existing 10 ton Variable Refrigerant

Flow (VRF) system from B503 and provide a replacement HVAC system. All work must comply with Part II Generic Requirements, 1. Governing Design and

Construction Documents of this SOW. Particular attention should be paid to the

DAFB Local Design Guide, section 6.0 Mechanical, with the exception of paragraph 6.1.3. The replacement HVAC system shall consist of 2 single zone variable air volume packaged units. The units should service the areas indicated in blue and orange as seen in Appendix A: B503 Floor Plan. The bathroom in the warehouse indicated by yellow shall also be serviced from one of the packaged unit systems, and be positively pressurized to exceed the exhaust cfm. Connect the new HVAC system to the existing Energy Recovery Ventilation (ERV) system.

The proposed HVAC system shall meet Anti-Terrorism and Force Protection requirements (see paragraph B below). The packaged units may be placed in the area indicated by the green box in Appendix A: B503 Floor Plan, an alternative location may be approved by CES.

A. SUBSTRUCTURE – No indication of work needed.

B. SHELL – Limited penetrations through exterior walls as necessary to provide the appropriate intake and exhaust functions. Intakes must meet the UFC 4-010-01

Standard 16. Air Intakes, which states that air intakes are to be located at least 10 feet above the ground.

C. INTERIORS – All necessary work to remove the existing VRF system and install appropriate ducting and equipment to support HVAC requirements to the rooms highlighted in blue in Appendix A: B503 Floor Plan.

D. SERVICES – All services necessary to design, install, and commission HVAC system.

E. EQUIPMENT – All equipment necessary to install the HVAC system. The existing Mechanical room may be used to place equipment. This room is shown in orange shaded part of Appendix A: B503 Floor Plan.

F. DEMOLITION – Remove existing variable refrigerant flow system.

G. BUILDING SITEWORK – No indication of work needed.

1.3. LIMITATIONS:

The users in B503 maintain 24/7 operations. The government shall be notified 2 weeks prior to the start of any major work that may impact operations. Examples of work that would impact operations are any overhead work to remove the VRF system, and/or installing new ducting in occupied offices. If possible work should be phased to limit interruptions to operations.

2. POINTS OF CONTACT (POC):

A. Project Manager: Lt Andrew Sauer, andrew.sauer.5@us.af.mil B. Project Management Section Chief: Mr. Earl Waller, earl.waller@us.af.mil

3. GOVERNMENT-FURNISHED INFORMATION, EQUIPMENT, MATERIAL,

AND PROPERTY

A. INFORMATION – The Government may provide information in the form of available plans, reports, maps, and drawings as necessary to facilitate accomplishment of the work required in this Statement of Work if available.

The Government may furnish electronic copies of available As-Built drawings that are pertinent to the facility involved upon contract award. However, these drawings are not warranted to show conditions as they actually exist. The designer shall field verify the information shown on the As-Built drawings and other information as necessary to produce a quality-designed project.

B. EQUIPMENT – None provided.

C. MATERIAL – None provided.

D. PROPERTY – None provided.

PART II – GENERIC REQUIREMENTS

1. GOVERNING DESIGN AND CONSTRUCTION DOCUMENTS

A. Department of Defense specifications and criteria located at http://wbdg.org/ffc/dod.

B. Air Force specifications and criteria located at http://wbdg.org/ffc/af-afcec.

C. Dover AFB Installation Facility Standards is located at http://www.wbdg.org/ffc/af-afcec/installation-facilities-standards-ifs/dover-afb-ifs.

D. Dover Air Force Base specifications listed below are provided as solicitation/contract attachments.

(1) Dover Air Force Base Design Guide

(2) Dover Air Force Base Standard Specifications

• 01 11 10 Dover Air Force Base General Requirements

• Dover Air Force Base Environmental Control

2. TABLE OF DELIVERABLES

2.1 436th Contracting Squadron (CONS) and 436th Civil Engineer Squadron (CES)

TABLE OF

DELIVERABLES

C O

N S

C E

S

El ec tro ni c H ar d

C op y

El ec tro ni c

H ar d C op y

DESIGN

Pre-Design Meeting Within 15 calendar days after

Notice to Proceed.

90% Design Submittal 1 1 2 Within 30 calendar days after Pre-Design

Meeting 90% Design Review Meeting Within 30 calendar days after 90%

Design Submittal.

100% Design Submittal 1 1 2 Within 60 calendar days after Pre-

Design Meeting The Government will provide review comments within 15 calendar days of receipt of the 90% and 100% Design Submittal.

100% Design Review Meeting Within 30 days after the 100%

Design Submittal.

Final “Issued for Construction”, signed and sealed, Design Submittal

1 1 2 Within 15 calendar days after 100% Design Review Meeting.

CONSTRUCTION

Pre-Construction Conference Prior to start of work on site.

Construction Progress Meetings Bi-weekly.

Construction Progress Meeting Minutes

1 1 Within 3 working days after each meeting with minutes provided by Contractor.

Progress Schedule (AF Form 3064) 1 1 Prior to the start of construction http://www.wbdg.org/ffc/af-afcec/installation-facilities-standards-ifs/dover-afb-ifs

Progress Report (AF Form 3065) 1 1 Bi-weekly, initiated by Contractor with CES inspector support and sent to CES and CONS via email.

Materials Approval (AF Form 3000)

1 1 1 Within 10 calendar days prior to requirement. CES will review and return within 10 calendar days.

Requests for Information (RFI) 1 1 Same day as issue or occurrence.

Pre-Final Inspection Report Performed by CES.

Final Inspection Report Performed by CES.

As Built Drawing 1 1 1 Within 30 calendar days after final inspection.

Warranties 1 1 1 Within 15 calendar days after final inspection acceptance.

3. DESIGN REQUIREMENTS

A. Project Management Plan (PMP) – Due within 15 calendar days after contract award.

B. Pre-Design Meeting – The Contracting Officer or designated representative shall conduct a Pre-Design Meeting at Dover Air Force Base, Delaware. This meeting will involve all stakeholders, allowing the Government and Contractor to discuss a complete overview of the project and any specific concerns. Importantly, a

Notice to Proceed (NTP) will be issued at this meeting.

C. 100% Design Submittal – Due within 60 calendar days after Pre-Design

Meeting. To include fully edited specifications, complete drawings, and Basis of Design. Design document submissions shall include the following:

(1) Table of Contents

(2) Executive summary of the scope of all work

(3) Minutes and sign-in sheets of all meetings pertaining to the development of the design

(4) Previous Government review comments and Contractor responses

(5) Design Analysis (Basis of Design) and appropriate engineering calculations

(6) Design drawings and specifications

(7) Schedule of submittals for material approval.

D. 100% Design Review Meeting – Due 30 calendar days after the 100% Design

Submittal. These meetings will include all relevant Base POCs and Contracting

Personnel on an as needed basis. These meetings will cover the design review comments made on the current design submittal and will include any pertinent issues which could affect future contract progress. The following items shall be covered:

(8) Meeting attendees and contact information

(9) Review and resolution of design review comments

(10) New business

(11) Schedule

E. Final “Issued for Construction” Design Submittal – Due within 15 calendar days after 100% Design Review Meeting. Includes signed and sealed final specifications, drawings, and Basis of Design. Submit all items electronically as well as the following hard copies: 2 half size drawing sets, 2 copies of specifications, and 2 copies of the Basis of Design. Drawing sets should include updated drawings to reflect changes of any systems that have been altered.

4. CONSTRUCTION REQUIREMENTS

A. In accordance with (IAW) United Facilities Guide Specifications (UFGS) 01 33 00 Submittal Procedures shall govern construction submittals.

B. PERMITS – The Contractor is responsible for all applicable permits, licenses, and certificates required to perform and execute this contract.

C. CONSTRUCTION PROGRESS MEETINGS – The Contractor shall perform

Construction Progress Meetings with meeting minutes provided to construction team Government representatives. These meetings will include all relevant

Base POCs and Government representatives on an as needed basis. The following items shall be covered:

(1) Meeting attendees and contact information

(2) Change Orders

(3) Requests for Information (RFI)

(4) Material Submittals and updated Submittal Register

(5) Updated schedule

(6) Progress made in past period

(7) Project issues affecting future work progress

5. CONTRACT ADMINISTRATION REQUIREMENTS

A. PROGRESS SCHEDULE, AF FORM 3064 – The Contractor shall prepare and submit, for approval, by the Contracting Officer (CO), a work breakdown structure. The work breakdown structure shall be used to report the cost and schedule status for this project. All tasks required under this type of contract shall be included in the work breakdown structure.

B. PROGRESS REPORTS, AF FORM 3065 – The Contractor shall complete biweekly Contract Progress Reports throughout the contract period. The work elements and percentages of the total job identified on the AF Form 3065 shall be identical to the work elements and percentages indicated on the AF Form

3064. Each invoice should be based on the most recent approved AF Form

3065 and will be entered through Wide Area Work Flow (WAWF). The AF

Form 3064, AF Form 3065, and invoice shall all cover the same period of time.

C. NOTIFICATION REQUIREMENT – The Contractor is required to notify the

Contracting Officer and the Project Manager of critical issues that may affect life, health, safety, contract performance, or the environment. Verbal notification should be made immediately followed by written notification as soon as practical.

D. TRANSMITTAL FORM – The Contractor is required to use AF Form

3000 Material Approval Submittal as the transmittal form for both design and construction submittals.

E. SUBMITTAL FORMAT – Provide submittals in electronic format, with the exception of material samples required for Submittal Description (SD)-04

Samples items. Compile the submittal file as a single, complete document, to include the Transmittal Form described within. Name the electronic submittal file specifically according to its contents, coordinate the file naming convention with the Contracting Officer. Electronic files must be of sufficient quality that all information is legible. Use Portable Document Format (PDF) as the electronic format, unless otherwise specified or directed by the Contracting Officer.

Generate PDF files from original documents with bookmarks so that the text included in the PDF file is both searchable and can be copied. If documents are scanned, Optical Character Resolution (OCR) routines are required. Index and bookmark files exceeding 30 pages to allow efficient navigation of the file.

When required, the electronic file must include a valid electronic signature, or scan of a signature. Email electronic submittal documents fewer than 10MB to an email address as directed by the Contracting Officer. Provide electronic documents over 10MB on an optical disc, or through an electronic file sharing system such as the AMRDEC SAFE Web Application located at the following website: https://safe.amrdec.army.mil/safe/. Provide hard copies of submittals when requested by the Contracting Officer. Up to three additional hard copies of any submittal may be requested at the discretion of the Contracting Officer, at no additional cost to the Government.

6. SECURITY:

A. SECURITY INSTRUCTIONS: All personnel employed by the contractor in the performance of this contract, or any representative of the contractor entering the

Installation shall abide by all security instructions and directives of Dover Air

Force Base.

(1) At the close for each work period, government facilities, equipment and materials shall be secured, lights, heat and water turned off and all doors and window secured.

(2) The contractor and, as applicable, subcontractor shall not employ persons for work on this contract if such employee is identified as a potential threat to the health, safety, security, general wellbeing or https://safe.amrdec.army.mil/safe/ operational mission of the Installation and its population, nor shall the contractor or subcontractor employ persons under this contract who have an outstanding criminal warrant as identified during the Criminal

Background Investigation (CBI).

(3) Contractors shall ensure their employees and those of their subcontracts have the proper credentials allowing them to work in the United States.

Employees and subcontractors later found to be undocumented workers will be remanded to the proper authorities.

(4) All contractors and subcontractors when working in a Controlled, Restricted or other sensitive areas must be escorted at all times. The military agency or unit responsible for the project is responsible for providing the escorts. The Contractor shall follow existing procedures and instructions for obtaining entrance to restricted or controlled areas.

B. CONTRACTOR BADGE POLICIES: All requests for contractor badges will be submitted through the 436th Contracting Squadron (436 CONS) and/or the requesting agencies base point of contact. 436 CONS or base point of contact will then complete an Operational Risk Management Assessment Form (ORM) for the requesting agency and submit it to the 436th Security Forces Squadron (436 SFS)

Pass and Registrations section for approval in accordance with Operation Plan

(OPlan) 31-101. As a minimum the ORM will be submitted 10-days prior to the requested date of employment. At no time will a contractor contact 436 SFS directly regarding badge denial.

(1) All contactor employees requesting unescorted access to the Installation are required to consent to a Criminal Background Investigation (CBI) prior to being granted entry to the Installation. Continued employment is contingent upon successful completion and favorable reporting of the

CBI.

(2) Dover Air Force Base (DAFB) Contractor badges will be issued for a maximum period of one year. Prior to reissuing new badges, all old badges must be returned to 436 SFS, Pass and Registration for destruction.

Prior to reissuing a badge an ORM must be resubmitted to the 436 SFS

Pass and Registration section for approval. In the event a badge is lost or stolen, immediately contact the 436 SFS, Pass and Registration office. The badge holder must accomplish the Loss/Theft of Identification

Worksheet and provide it to his/her supervisor. The supervisor of the contractor will investigate the loss and report in writing the circumstances in which the badge was lost to the 436 CONS and 436 SFS, Pass and

Registration office. A new request for a badge must be completed prior to a new badge being reissued.

(3) The 436 CONS or base POC will immediately notify 436 SFS, Pass and

Registration when a contractor’s employment has been terminated. The

Site Supervisors are responsible for notifying and returning the contractor’s badge to 436 SFS Pass and Registration when this occurs.

C. INSTALLATION ACCESS: The contractor shall obtain personal contractor identification badge for all employees and vehicle passes for all contractor and personal vehicles requiring entry onto DAFB from 436 SFS, Pass and

Registration, for the duration of the contract.

(1) Employees are only permitted to enter the Installation during the date and time periods indicted on their contractor badge. Vehicle registration, proof of insurance and a valid driver’s license must be presented for all vehicles while operating on the Installation. All vehicles entering the

DAFB Main Base, Military Family Housing or sensitive areas are subject to search. Any refusal or non-consent by an employee will result in termination of their base access and immediate confiscation of this access badge.

(2) During Force Protection Condition (FPCON) Normal and Alpha, personnel without base issued badges must be sponsored onto the installation.

(3) During FPCON Bravo, Charlie and Delta, personnel without base issued identification shall be physically escorted onto the installation.

(4) During Higher FPCONs (Charlie and Delta) the base will normally curtail non-essential operations/functions; access by non-essential Contract operations will be suspended as the direction of the Installation

Commander.

(5) Department of Defense (DoD) contractors or subcontractors without a

Common Access Card (CAC) or who do not have access to a government

Non-classified Internet Protocol Router Network (NIPRNET) computer performing construction on the installation should consider completing

Anti-Terrorism (AT) Awareness Level I training IAW AFI 10-245, Antiterrorism, Standard 25, by completing the― Force Protection computer based training (CBT) course through the Joint Knowledge

Online (JKO) Learning Management System (LMS) at http://jko.jten.mil/courses/atl1/launch.html IMPORTANT: The standalone course MUST be completed on the computer in which it is started.

Course progress is not transferable between computers. The standalone course does provide a completion certificate but will not be tracked on

JKO and no record will be maintained. AT Awareness Level I Training should be provided by the requiring unit after contract award or the sponsoring organization.

D. FLIGHTLINE DRIVING: Not applicable for this project.

http://jko.jten.mil/courses/atl1/launch.html

APPENDIX A: B503 Floor Plan

APPENDIX B: DAFB Design Guide (9 April 2017)

6.0 Mechanical

6.1 Heating, Ventilating, and Air Conditioning (HVAC). The UFCs have had several significant changes in recent years. Designers should be sure to consult the latest UFCs vs designing by experience only.

6.1.1 All air handlers, chillers, and compressors shall be provided by TRANE, YORK, or CARRIER unless otherwise approved by DAFB.

6.1.2 The use of cooling tower type cooling systems is not permissible on Dover AFB. All chillers and condensing units shall be provided with manufacturer’s optional condenser, fin, or access guards.

6.1.3 Deleted.

6.1.4 All HVAC systems shall have fully ducted returns. In cases where ceiling space does not allow the room for ductwork and piping, low temperature fan coil / unit ventilators may be used subject to approval by the DAFB. These systems shall be installed with air-cooled chillers and ice where needed. Fan coil units (FCU’s) and unit ventilators shall be installed with reheat and be provided with variable air volume controls to match room load with the ability to provide zone temperature and humidity control. In terminal unit applications, 4-pipe auto changeover control systems are not allowed (the chilled water coils in the terminal units are used to provide adequate heat when reheat coils are not adequate to meet heating load). In lieu of providing auto 4-pipe changeover valves alternate supplemental heating options are to be evaluated and their use is approved by Dover AFB.

6.1.5 Building pressurization in VAV’s, AHU’s and FCU’s with central OA units shall be controlled directly by the EMCS system to be slightly positive to reduce infiltration.

6.1.6 Mechanical piping systems shall have independent chilled water and hot water for a true 4-pipe system. All chilled water and hot water system designs shall be based on a concentration of propylene glycol necessary to protect from freezing down to +10 degrees Fahrenheit. Chilled water piping shall be designed around a minimum 10-degree F delta T. Construction documents shall require testing to confirm freeze protection at 10 degrees Fahrenheit for both chilled and hot water systems.

6.1.7 Facilities requiring a total boiler capacity of over 250,000 BTUs shall be designed with multiple boilers. In accordance with UFC 3-410-01FA “Heating, Ventilating, and Air Conditioning”, determine the number and size of boilers to efficiently serve both the maximum winter design load and the minimum summer load. With the largest boiler off line, the remaining boiler(s) will be capable of carrying not less than 65 percent of the maximum winter design load. Where the smallest boiler installed has a capacity of more than twice the minimum summer load, consider adding an additional boiler or hot water heater sized for the anticipated summer load. The intent being that if one unit goes out of service, the building will not be completely without heating. Provide adequate room, connections, piping, etc., in boiler installations where future expansion is likely. The base design temperature for heating hot water systems shall be 180 degrees F supply and 140 degrees return water (40-degree delta T) however, the heating hot water temperatures should fluctuate based on outdoor temperature. All boilers shall be fully condensing. Special attention should be paid to hot water boiler condensation to avoid falling below the manufacturer’s low temperature/flow requirements.

6.1.8 To minimize the “dumping/stratification” effect and maintenance issues designers shall not use fan powered VAVs unless expressly approved by Dover AFB. Typical minimum VAV setting for cooling airflow should be set for approximately 30% (field adjustable).

6.1.9 Show unions or flanges and shut off valves at each piece of equipment for maintenance. All major pieces of equipment (chillers, pumps, cooling/heating coils, etc.) shall be provided with strainers. Ensure unions or flanges are located to allow easy heat exchanger or coil removal.

Dielectric nipples shall be used. The use of dielectric unions shall not be permitted unless expressly approved by Dover AFB. Show coil, heat exchanger and filter removal areas. Weatherproof vents and air intakes shall be installed. For all hydronic heating and cooling systems, indicate the installation of shot feeders with chemical treatments (install feeder on outlet of circulation pump with throttling valve in between connections) and diaphragm expansion tanks. Separate glycol feed tanks and pump assemblies shall be provided for each heating & cooling system on all new construction and major renovation projects. All chemically treated water affected by a project shall be properly maintained and tested by the contractor until the completed heating and/or air conditioning systems are accepted by the Air Force.

6.1.10 Use packaged chillers when chilled water systems are specified to keep noise and refrigerant out of mechanical room. If chillers are specified, provide valve and capped with 3” camlock connections near chillers for connection of temporary chillers. Temperature and pressure gauges shall be provided on chiller supply and return piping in addition to T/P sensors required by the controls system. +10° F food grade propylene glycol is required for closed loop heating and cooling systems. Compliance test results are required after construction. Do not specify % of concentration of propylene glycol in lieu of +10° F.

Ethylene glycol is prohibited.

6.1.11 Ductwork.

6.1.11.1 Fiberglass duct board is not acceptable for use on DAFB (no fiberglass or fibrous material shall be exposed to the air stream). Flexible ductwork shall not be used for duct mains.

When used, runs shall not exceed 6 feet in length.

6.1.11.2 The use of sound attenuation in HVAC systems should be minimized. When necessary, use sound attenuators or duct lining that are constructed of perforated or baffled galvanized material. All surfaces touching the air stream shall be metal.

6.1.11.3 Full radius or splitter vane elbows shall be used for all ductwork installations. OBD registers shall not be utilized in occupied spaces.

6.1.12 Minimize ceiling and roof-mounted equipment. If equipment must be mounted on the roof, provide metal walkways with fall protection anchors to allow for maintenance. If equipment must be mounted in the ceiling, provide catwalks with access ladders to provide for maintenance of these items. Rooftop mounted HVAC unit housings shall be insulated for R-13 or greater.

6.1.13 Victaulic (grooved) fittings are prohibited for low temperature HW circulation systems.

6.1.14 In general, all HVAC condensate shall be routed to the exterior of the building and discharged at grade. Condensate lines shall not be exposed on the building exterior except at grade. The condensate terminations shall be located as to prevent ice hazards in the winter months. High volume condensate discharge installations shall have the condensate routed to the building sanitary drains but must be specifically approved Dover AFB. High volume should be considered as any amount of discharge that cannot easily infiltrate into the ground under normal operating conditions.

6.1.15 Five year extended manufacturer’s warranty for parts only is required for mechanical HVAC system components.

6.1.16 A written pre-commissioning and commissioning plan is required for HVAC equipment and digital controls at the material submittal phase. This plan shall include a two week monitored endurance testing period for all HVAC equipment which shall take place prior to building occupancy.

For all projects the TAB and/or commissioning agent shall be a direct subcontractor to the general contractor and shall not be a subcontractor to the mechanical contractor.

6.1.17 HVAC System Control Requirements

6.1.17.1 All HVAC direct digital controls shall be compatible with the Trane enterprise software used by the Base Civil Engineer Energy Monitoring Control System (EMCS) Shop.

6.1.17.2 Control sequence logic shall reside in DDC hardware in the building. The building control network shall not be dependent upon connection to a Energy Monitoring Control System (EMCS) for performance of control sequences in this specification. The hardware shall, to the greatest extent practical, perform the sequences without reliance on the building network.

6.1.17.3 The hardware shall be installed such that individual control equipment can be replaced by similar control equipment from other equipment manufacturers with no loss of system functionality. All local Building Control Units (BCU) shall be provided with an interactive local display panel. This panel shall be capable of displaying system characteristics and setpoints without service technicians requiring a laptop computer.

6.1.17.4 All necessary documentation, configuration information, configuration tools, programs, drivers, and other software shall be licensed to and otherwise remain with the Government such that the Government or their agents are able to perform repair, replacement, upgrades, and expansions of the system without subsequent or future dependence on the Contractor.

6.1.17.5 The Contractor shall provide sufficient documentation and data, including rights to documentation and data, such that the Government or their agents can execute work to perform repair, replacement, upgrades, and expansions of the system without subsequent or future dependence on the Contractor.

6.1.17.6 Hardware shall be installed and configured such that the Government or their agents are able to perform repair, replacement, and upgrades of individual hardware without further interaction with the Contractor.

6.1.17.7 Control hardware shall be installed and configured to provide all input and output Standard Network Variables (SNVTs) as shown and as needed to meet the requirements of this specification.

6.1.17.8 All DDC devices installed under this specification shall communicate via ANSI/EIA 709.1B. The control system shall be installed such that a SNVT output from any node on the network can be bound to any other node in the domain.

6.1.17.9 The building control network shall connect to the Utility Monitoring and Control System located in the 436 Civil Engineer Squadron located in Bldg 615 via the base LAN.

6.1.17.9.1 To operate on the LAN, the contractor shall obtain an Interim Authority To Operate (IATO) from the 436 Communications Squadron. Approval of the IATO can take up to 8 weeks.

An Internet Security Scan (ISS) is a required attachment of the IATO. 436 Civil Engineer Squadron will schedule the ISS through the 436 Communications Squadron.

6.1.17.9.2 Upon issuance of the IATO, the contractor shall obtain the Authority to Operate through submission of the AMC Form 1014. This form can be obtained from 436 Civil Engineer Squadron.

6.1.18 The project documents shall indicate that duct smoke detectors are to be powered, supervised, and re-settable from the facility fire alarm panel.

6.1.19 All actuators shall be rated for 150 percent of design torque. Damper shafts shall have at least one flat facet at the point of connection to the actuator.

6.1.20 Consider aesthetics in design. Use visual screens for exterior equipment. Hide fire sprinkler test lines. Use white coated sprinkler heads on SAT ceilings and center sprinkler heads in tile.

6.1.21 Insulation. Verify condition and quantity of existing piping, equipment, and duct work insulation.

In many cases, re-insulation is necessary. Approval to reuse existing insulation must be approved by Dover AFB. Where insulation details are provided on project plans minimum R-Values shall be provided to avoid confusion over the intent of the detail. e.g. If insulation is identified as two inches thick a minimum R-Value must be provided. All exterior insulation shall be provided with metal or PVC jacketing in accordance with UFGS, UV protectant paint is not acceptable.

6.1.22 The color of gas supply lines within unfinished spaces of the facility shall be yellow as well as labeled in accordance with applicable code.

6.1.23 HVAC system intake louvers shall be properly sized to prevent water and snow infiltration.

The project design analysis shall address the approach used to prevent water and snow infiltration and any additional measures which are required to prevent water/snow infiltration.

6.1.24 Variable Frequency Drives (VFD) Requirements

6.1.24.1 Pumps shall be selected so that the building electrical system is not damaged in pump VFD operation.

6.1.24.2 VFD devices shall be selected so that they operate at maximum efficiency. Designers shall not add “safety factors” so the installed device is too powerful and requires permanent flow restriction devices (this practice requires the building to consume additional energy 24/7). Circuit setters are not to be used for variable speed systems unless 60 Hz operation will cause damage to the building systems.

6.1.24.3 On DAFB systems that require “N+1” redundant fans and/or pumps for critical operations traditional “lead/lag” control sequence shall not be used. Redundant fans and pumps shall operate in parallel at equal speed rather than using the traditional “lead/lag” control sequence. If one device fails the other device(s) shall simply speed up to maintain setpoint.

6.1.24.4 Minimize the wiring length between VFD and motor with a maximum length of 60 feet at 480 VAC. If wire length must be over 60 feet then an inverter rated motor shall be used or reduce motor voltage to less than 300.

6.1.24.5 In order to minimize VFD bearing failure the testing and start-up specification shall require that the voltage from the operating motor shaft to the ground be measured using an electronic meter. These measurements shall be recorded through the entire range of anticipated speeds. If the voltage exceeds about 3.5 VAC the condition must be resolved (possibly by adjusting the VFD “carrier frequency”, attaching a grounding brush to the shaft, or contacting the vendor a recommendation).

6.1.24.6 When other design requirements do not take priority design the temperature and pressure setpoints of the system to maximize the energy saving ability of VFDs.

6.1.24.7 VFD shall not be used for motors that run constantly at full speed.

6.1.24.8 All VFDs shall be mounted to solid structural members not directly to the flexible sides of air handling units, plenums or ductwork.

6.1.24.9 Critical equipment shall have a VFD installed that shall be capable of operating independent of HVAC control system failure (ON/OFF speed controller hardwired to stand-alone control panel). The intent is that the VFD can be operated even when the HVAC control system is not available.

6.1.24.10 Line Reactance: Provide between 3% and 5% of input line reactance, provided in the form of separate line reactors at the input of the VFD, reactors included as part of the DC bus or a combination of the two totaling 3% to 5%.

6.1.24.11 Output Rate of Rise, Peak Output Voltage and Wire Length: VFDs shall be specified so as to prevent damage to typical premium efficiency motors. Implementing the following requirements should eliminate motor insulation and bearing failures associated with VFD use.

1) Control the output rate of rise or use output circuitry, which prevents the peak output voltage from reaching 1,000 volts to ground at the motor.

2) Limit 480 VAC wire length to less than 60 feet between the motor and VFD (shorter is better).

3) If a small motor must be mounted on the roof (typically an exhaust fan) consider using a lower voltage (<300 VAC) motor so an unlimited wire length can be used.

6.1.24.12 By-Pass Starter: A manual by-pass starter is typically required. Critical need applications may require an automatic bypass feature. In some critical applications, a backup fan or pump with VFD is provided, in which case, by-pass starters may not be necessary. Motors larger than 75 HP may require a soft-start feature in the by-pass starter.

6.1.24.13 Amperage Interrupt Capacity: Requirements can vary depending on the electrical system design. The nominal requirement is a 65,000 RMS symmetrical ampere interrupting capacity. Some electric services require less capacity so the Division 15 designer should coordinate with the Division 16 designer to determine the appropriate specification.

6.1.24.14 Radio Frequency Sensitive Applications: A VFD may be installed in the vicinity of highly sensitive electronic equipment. An appropriate FCC rating may be necessary in these applications and this requirement may result in the use of older 6-step technology VFDs. Some of the control and interface requirements in the guide specification may not be possible with 6- step VFDs so it may be more practical to heavily filter an IGBT VFD if all of the modern control features are needed.

6.1.24.15 Interface with the Fire/Life Safety Systems: Coordinate with Division 16 designer to insure compliance with all prevailing requirements.