Attachment_2_23_08_00_-_Commissioning_Of_HVAC_Systems_53A.pdf

NCTR-Building 53A Renovation 2015-057 Jefferson, Arkansas July 2015

COMMISSIONING OF HVAC SYSTEMS

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SECTION 23 08 00

COMMISSIONING OF HVAC SYSTEMS

PART 1 GENERAL

1.01 SUMMARY:

A. The requirements of this Section apply to all sections of Division 23.

B. This project will have selected building systems commissioned. The complete list of equipment and systems to be commissioned are specified in Section 23 08 00 Commissioning of HVAC Systems. The commissioning process, which the Contractor is responsible to execute, is defined in Section 01 91 13 General Commissioning Requirements. The Commissioning Agent (CxA) appointed by the Owner will manage the commissioning process.

1.02 ENVIRONMENTAL CONSIDERATIONS

A. This project is designed and constructed with practices and procedures to meet the project’s environmental considerations and goals. These considerations and goals are to establish a facility which is environmentally responsible and a healthy place to live and work.

1.03 RELATED REQUIREMENTS

A. Section 01 91 13 – General Commissioning Requirements

1.04 DEFINITIONS:

A. Refer to Section 01 91 13 General Commissioning Requirements for definitions.

1.05 DESCRIPTION

A. Refer to Section 01 91 13 General Commissioning Requirements for the description of the

Commissioning process.

1.06 SUBMITTALS

A. Refer to 01 30 00 Administrative Requirements for specific submittal requirements. In addition, provide the Commissioning Authority the following:

1. Manufacturers Installation Instructions for all equipment and components related to

Division 23 as requested.

2. Equipment product data, cut sheets, performance data, pump curves, O&M manuals

3. Completed equipment start up reports

4. Control drawing submittal. The control drawings shall have a key to all abbreviations. The drawings shall contain graphic schematics depictions of the systems and each component.

5. Control points list with at least the following included for each point:

a. Controlled system

b. Point abbreviation

c. Point description

d. Display unit

e. Control point or set point (Yes / No)

f. Monitoring point (Yes / No)

g. Intermediate point (Yes / No)

h. Calculated point (Yes / No)

1.07 RESPONSIBILITIES

A. Mechanical/Plumbing, Controls, and TAB Contractors: The commissioning responsibilities applicable to each of the Mechanical/Plumbing, Controls, and TAB contractors of Division 23 (all references apply to commissioned equipment only):

1. Construction and Acceptance Phases

a. Include the cost of participating in commissioning in the contract price. Commissioned equipment is defined in this section.

b. In each purchase order or subcontract written, include requirements for submittal data and completion of commissioning documentation.

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c. Prepare preliminary schedule for Mechanical system orientations and inspections, operation and maintenance manual submissions, training sessions, pipe and duct system testing, flushing and cleaning, equipment start-up, testing and balancing and task completion for owner. Distribute preliminary schedule to commissioning team members.

d. Update schedule as required throughout the construction period.

e. Attend and actively participate in commissioning meetings and other meetings necessary to facilitate the Commissioning process.

f. Provide requested documentation to the CxA for development of the commissioning documentation.

g. Complete a start-up and initial checkout plan using manufacturer’s start-up procedures and the CxA furnished Prefunctional checklists for all commissioned equipment. Submit to GC for review prior to startup. CxA will verify for compliance.

Refer to Section 01 91 13 for further details related to start-up.

h. Coordinate with the CxA to provide (36) hour advance notice so that the witnessing of equipment and system start-up and testing can begin.

i. During the startup and initial checkout process, execute the related portions of the prefunctional checklists for all commissioned equipment.

j. Assist the CxA in all verification and functional performance tests.

k. Correct system deficiencies before functional testing. Air and water TAB shall be completed with discrepancies and problems remedied before functional testing of the respective air-or water-related systems.

l. Perform and clearly document all completed startup and system operational checkout procedures, providing a copy to the GC.

m. Provide skilled technicians to execute starting of equipment and to execute the functional performance tests. Ensure that they are available and present during the agreed upon schedules and for sufficient duration to complete the necessary tests, adjustments, and problem-solving.

n. Provide all test equipment necessary to fulfill specified testing requirements.

o. Complete CxA furnished functional performance tests and procedures. Subs shall review test procedures to ensure feasibility, safety and equipment protection, and provide necessary written alarm limits to be used during the tests.

p. Perform functional performance testing under the direction of the CxA for specified equipment. Assist the CxA in interpreting the monitored data, as necessary

q. Correct deficiencies (differences between specified and observed performance) as interpreted by the CxA and A/E, and retest the equipment.

r. Prepare O&M manuals according to the Contract Documents, including clarifying and updating the original sequences of operation to as-built conditions. O&M’s to be consistent with the final tested condition of all installed systems.

s. During construction, maintain as-built red-line mark-ups for all drawings. Update as needed following functional testing. Furnish final copy to CxA for inclusion in final report.

B. Mechanical/Plumbing Contractor: The commissioning responsibilities of the Mechanical/Plumbing contractor, during construction and acceptance phases, in addition to those listed in Paragraph A, above, are:

1. Participate in the Commissioning of the mechanical systems

2. Provide manufacturers installation and operation manuals, product data, and submittals as required by CxA for the development of the Prefunctional checklist.

3. Provide startup for all HVAC equipment, except for the building automation control system.

Clearly document all completed startup and system operational checkout procedures, providing a copy to the CxA.

4. Complete appropriate portions of the commissioning prefunctional checklist as the work progresses. Checklist shall be current with the actual job progress. Return completed prefunctional checklist to the CxA.

5. Assist and cooperate with the TAB contractor and CxA by:

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6. Putting all HVAC equipment and systems into operation and continuing the operation during each working day of TAB and commissioning, as required.

7. List and clearly identify on the as-built drawings the location of all air-flow stations (if applicable).

8. Prepare a preliminary schedule for Division 23 pipe and duct system testing, flushing and cleaning, equipment start-up, and TAB start and completion for use by the CxA. Update the schedule as appropriate.

9. Notify the GC and CxA when pipe and duct system testing, flushing, cleaning, startup of each piece of equipment, and TAB will occur. Be responsible to notify the GC ahead of time, when commissioning activities not yet performed or not yet scheduled will delay construction. Be proactive in seeing that commissioning processes are executed and that the CxA has the scheduling information needed to efficiently execute the commissioning process.

10. Refer to Section 01 91 13 for specific details on non-conformance issues relating to prefunctional checklists and tests and for issues relating to functional performance tests.

C. Controls Contractor: The commissioning responsibilities of the controls contractor, during construction and acceptance phases in addition to those listed in Paragraph A, above are:

1. Sequences of Operation Submittals: The Controls Contractor’s submittals of control drawings shall include complete detailed sequences of operation for each piece of equipment, regardless of the completeness and clarity of the sequences in the specifications. They shall include:

a. An overview narrative of the system (1 or 2 paragraphs) generally describing its purpose, components, and function.

b. All interactions and interlocks with other systems.

c. Detailed delineation of control between any packaged controls and the building automation system, listing what points the BAS monitors only and what BAS points are control points and are adjustable.

d. Written sequences of control for packaged controlled equipment. (Equipment manufacturers’ stock sequences may be included, but will generally require additional narrative).

e. Start-up sequences.

f. Warm-up mode sequences.

g. Normal operating mode sequences.

h. Unoccupied mode sequences.

i. Shutdown sequences.

j. Capacity control sequences and equipment staging.

k. Temperature and pressure control: setbacks, setups, resets, etc.

l. Detailed sequences for all control strategies, e.g., economizer control, optimum start/stop, staging, optimization, demand limiting, etc.

m. Effects of power or equipment failure with all standby component functions.

n. Sequences for all alarms and emergency shut downs.

o. Seasonal operational differences and recommendations.

p. Initial and recommended values for all adjustable settings, setpoints, and parameters that are typically set or adjusted by operating staff; and any other control settings or fixed values, delays, etc. that will be useful during testing and operating the equipment.

q. Schedules, if known.

2. Control Drawings Submittal

a. The control drawings shall have a key to all abbreviations.

b. The control drawings shall contain graphic schematic depictions of the systems and each component.

c. The schematics shall include the system and component layout of any equipment that the control system monitors, enables or controls, even if the equipment if primarily controlled by packaged or integral controls.

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3. An updated as-built version of the control drawings and sequences of operation shall be included in the final controls O&M Manual submittal.

4. Assist and cooperate with TAB contractor in the following manner:

a. Meet with the TAB contractor prior to beginning TAB and review the TAB plan to determine the capabilities of the control system toward completing TAB. Provide the TAB contractor any unique instruments needed for setting terminal unit boxes and instruct TAB in their use (handheld control system interface for use around the building during TAB, etc.).

b. For a given area, have all required prefunctional checklists, calibration, startup, and selected functional tests of the system completed prior to TAB.

5. Assist and cooperate with the CxA in the following manner.

a. Complete appropriate portions of the commissioning prefunctional checklists as the work progresses. Checklists shall be current with the actual job progress. Return completed prefunctional checklists to the CxA through the proper contractual protocols.

b. Using a skilled technician who is familiar with the installed systems in this building, execute the functional testing of the controls system. Assist in the functional testing of all equipment and systems.

c. Execute and provide all control system trend logs as requested by CxA.

d. Execute and provide system reports as requested by the CxA.

6. Provide a signed and dated certification to the GC upon completion of the checkout of each controlled device, equipment and system prior to functional testing for each piece of equipment or system, that all system programming is complete as to all respects of the Contract Documents, except functional testing requirements.

7. List and clearly identify on the as-built duct and piping drawings the locations of all monitoring and control sensors.

D. TAB Contractor: The duties of the TAB contractor, in addition to those listed in Paragraph A above are:

1. The TAB field technicians shall keep a running log of events and issues. Submit hand-written reports of discrepancies, deficient or uncompleted work by others, contract interpretation requests and lists of completed tests to the CxA and GC at least twice a week.

2. Communicate in writing to the controls contractor all setpoint and parameter changes made or problems and discrepancies identified during TAB which affect the control system setup and operation.

3. Assist the CxA in the TAB verification process. The CxA will randomly select a system where TAB work has been completed. The TAB contractors will take readings with the CxA present, using the calibrated instruments used during the TAB process. Verification readings will be compared to reported TAB readings and evaluated for consistency and repeatability.

4. Assist as needed during the functional performance testing conducted by the commissioning team.

5. Provide a draft copy of the TAB report to the CxA within 2 weeks of completion. The report shall contain a full explanation of the methodology, assumptions, and the results in a clear format with designations of all uncommon abbreviations and column headings. Provide the CxA with any updates as a result of A/E review.

PART 2 PRODUCTS - NOT USED

PART 3 EXECUTION

3.01 STARTUP

A. The mechanical and controls contractors shall follow the start-up and initial checkout procedures listed in the Responsibilities list in this section and in Section 01 91 13. Division 23 has start-up responsibility and is required to complete systems and sub-systems so they are fully functional, meeting the design objectives of the Contract Documents. The commissioning

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procedures and functional testing do not relieve or lessen this responsibility or shift that responsibility partially to the Commissioning Agent or Owner.

B. Functional testing is intended to begin upon completion of a system. Functional testing may proceed prior to the completion of systems or sub-systems at the discretion of the GC and CxA.

Beginning system testing before full completion does not relieve the Contractor from fully completing the system, including all prefunctional checklists as soon as possible.

3.02 EQUIPMENT/SYSTEMS TO BE COMMISSIONED

A. The work included in the commissioning process involves a complete and thorough evaluation of the operation and performance of all components, systems and sub-systems. The CxA with assistance from the installing Contractors will evaluate the equipment and systems during the commissioning process. The specific systems and subsystems to be commissioned are listed below:

1. HVAC & R Systems and associated controls

2. Domestic hot water systems

3. Lighting and daylighting controls

4. DDC Components related to the above

5. Building Automation System

3.03 SAMPLE COMMISSIONING DOCUMENTATION

A. The following documents are sample prefunctional and functional test. The purposes of these sample documents are to provide the Contractors a reference for the amount of effort that will be needed to document the commissioning process. Project specifics prefunctional checklists and functional performance test will be provided at a later date.

B. Sample Prefunctional Checklist follows after end of this section.

C. Sample Functional Performance Test follows after end of this section.

END OF SECTION