JA-5_Tab_4_Specification_15035_Testing _Adjusting _and_Balancing_for_HVAC.pdf

ENERGY CONS: REPLACE MOTORS & INSTALL VFDS (MULTI) SECTION 15035

EIELSON AFB, ALASKA TESTING, ADJUSTING, AND

PROJECT NO.: FTQW 13-1503 BALANCING FOR HVAC

PART 1 GENERAL

1.1 SCOPE: SECTION 15035 – TESTING, ADJUSTING, AND BALANCING FOR HVAC

A. This Section covers balancing and adjusting of mechanical systems.

1.2 SUBMITTALS

A. Balancer Qualifications and Balancing Plan:

1. Name and address of balancing subcontractor.

2. Balancing subcontractor’s certificates, qualifications, and experience in balancing mechanical systems, located in Alaska, of comparable type and size to those associated with this Project.

3. Copies of standard data report forms proposed for use on this Project.

4. Project specific plan/procedures for balancing of mechanical systems.

1.3 QUALITY ASSURANCE

A. The balancing subcontractor shall be a firm, independent of the General Contractor or any other subcontractor, specializing in balancing mechanical systems, with at least five years’ experience in balancing mechanical systems, located in Alaska, of comparable type and size to those associated with this Project.

B. Comply with the applicable procedures and standards outlined in one of the following publications:

1. "National Standards for Field Measurements and Instrumentation, Total Systems Balance, Air Distribution-Hydronics Systems," dated 1989 by the Associated Air Balance Council.

2. "Procedural Standards for Testing, Adjusting, and Balancing of Environmental Systems," dated January 2005, by the National Environmental Balancing Bureau.

C. Instruments utilized in the balancing procedure must have been calibrated within a period of six months, or as otherwise recommended by the equipment manufacturer, and checked for accuracy prior to start of Work. Make maintenance and calibration records for all equipment available on request for examination by the Contracting Officer.

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ATTACHMENT JA-5

Tab 4_Specification_15035_Testing, Adjusting, and Balancing for HVAC

PROJECT NO.: FTQW 13-1503 BALANCING FOR HVAC

PART 2 PRODUCTS

2.1 BALANCING REPORTS

A. Bind, tab by system, number pages, and include a table of contents at the beginning of the report.

B. Label the front cover and end panel. Label to include Project title, Project number, date, and facility name.

C. Include a cover sheet containing the following information:

1. Project title, Project number, facility name, Contractor, and date.

2. Name and address of balancing agency performing Work.

3. Signature and seal of responsible member of balancing agency.

D. Provide list of balancing equipment used on this Project with date of last calibration indicated.

E. Summarize Work observed that does not conform to the Contract Documents and Work that does not allow the system to be balanced in accordance with the Contract Documents. Include opinions on why Work does not allow the system to be so balanced, collect data to support those opinions, and recommendations for corrective action that would allow the system to be so balanced.

F. Compile data on standard report forms submitted and accepted.

1. Identify equipment by the same symbol or number used on Contract Drawings.

2. Note Work observed that does not conform to the Contract Documents and installations that do not allow the system to be balanced in accordance with the Contract Documents on the report form.

2.2 REPORT DATA REQUIRED

A. Pumps and associated motors:

1. Tag No., location, and service.

2. Pump nameplate information.

3. Motor nameplate information.

4. Installed thermal overload heater rating.

5. Specified head (FT H2O).

6. Specified flow (GPM).

7. Operating head (FT H2O).

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PROJECT NO.: FTQW 13-1503 BALANCING FOR HVAC

8. Operating flow (GPM).

9. Operating temperatures (degrees Fahrenheit).

10. Pump curve with operating point plotted.

11. Motor operating voltage and amperage.

B. Balance valves:

1. Valve no., terminal unit served, location, and size.

2. Specified flow (GPM).

3. Operating setpoint.

4. Operating flow (GPM).

5. Operating pressure drop (FT H2O).

C. Flow control valves:

1. Terminal unit served, location, and size.

2. Specified flow (GPM).

3. Pressure drop (psig).

D. Fans and associated motors:

1. Tag No., location, and service.

2. Fan nameplate information.

3. Motor nameplate information.

4. Installed thermal overload heater rating.

5. Specified capacity (CFM).

6. Specified static pressure (In H2O).

7. Specified fan speed (RPM).

8. Operating capacity (CFM). Submit duct or filter bank traverse data.

9. Operating static pressure (In H2O).

10. Pressure drop (In H2O) across each filter bank with clean filters at full capacity.

11. Operating fan speed (RPM).

12. Motor operating voltage and amperage.

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13. Fan sheave and belt data.

14. Fan curve with plotted operating point.

15. Outside air quantity (CFM) at minimum outside air damper setting as specified in Section “Direct Digital Control Systems”. Submit duct traverse data.

E. Hydronic Coils:

1. Tag No., location, and service.

2. Face Area.

3. Specified capacity (CFM).

4. Actual capacity (CFM).

5. Specified flow (GPM).

6. Operating flow (GPM).

7. Operating pressure drop (FT H2O).

8. Entering Water Temperature (degrees Fahrenheit).

9. Leaving Water Temperature (degrees Fahrenheit).

10. Entering Air Temperature (degrees Fahrenheit).

11. Leaving Air Temperature (degrees Fahrenheit).

F. Room air outlets:

1. Tag No. and location.

2. Size and style.

3. Area factor (Ft2).

4. Specified capacity (CFM).

5. Actual face velocity (FPM).

6. Actual capacity (CFM).

G. Variable volume terminal units:

1. Tag No. and location.

2. Size and style.

3. Specified capacity at minimum setting (CFM).

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4. Actual capacity at minimum setting (CFM).

5. Specified capacity at maximum setting (CFM).

6. Actual capacity at maximum setting (CFM).

PART 3 EXECUTION

3.1 GENERAL

A. Provide labor, instruments, and materials required to balance and adjust the facility's mechanical systems installed by this Project, including those systems modified as part of this Project, to obtain fully functional and properly operating systems.

B. Notify Contracting Officer in writing at least 10 days in advance as to when balancing is scheduled to commence.

C. Prior to starting the balancing procedures verify that systems to be balanced are complete, operational, and that:

1. Filters and strainers are clean.

2. Controls system installation is complete and controlling systems to be balanced in accordance with the Contract Documents.

3. Isolation valves or dampers are full open.

4. All piping and ductwork has been cleaned of construction debris and scale.

D. Put all mechanical systems and equipment into full operation and continue the operation of same during each working day of balancing.

E. Keep informed of any major changes made during construction, and obtain a complete set of As-Built Drawings, computer outputs, etc. before starting balancing.

F. Document Work observed that does not conform to the Contract Documents.

G. When Work does not allow the system to be balanced in accordance with the Contract Documents, collect system performance data that will help in determining why the system cannot be so balanced, offer possible corrective action, and otherwise cooperate with the Contracting Officer.

H. Prior to Substantial Completion Inspection, submit three copies of balancing report for review by the Contracting Officer.

I. Upon request, recheck random selections of up to ten percent of the data recorded in the balancing report in the presence of the Contracting Officer. Rebalance the mechanical systems, prepare, and submit for review a new report if more than twenty percent of the rechecked readings deviate more than 10 percent from the recorded reading in the balancing report.

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J. Upon acceptance of Work by the Contracting Officer, revise balancing report incorporating revised data, description of corrective measures taken to correct previously identified deficiencies, and other Contracting Officer review comments and deliver four record copies of the final report to the Contracting Officer.

K. Following final acceptance of the balancing report, permanently mark all dampers, valves, and other adjustment devices so that the adjustment can be restored if disturbed at any time.

3.2 HYDRONIC SYSTEMS PROCEDURES

A. Examine hydronic circulating systems to determine that the systems are at the proper pressures and temperatures and that air is removed from the equipment and piping.

B. Record voltage and amperage draw of each motor. Record flow and head for pumps. Plot flow and head on manufacturer's pump curve and include with report.

C. Adjust balancing cocks to obtain the design flows and mark resulting position on each cock.

Record terminal unit served, location, type, size, design flow, actual flow, settings, and pressure drop. Flows shall be within ten percent of indicated design. If sufficient pump capacity is not available to obtain indicated flows, distribute shortfall equally amongst all terminal units.

D. Permanently mark, etched or stamped, balancing cock setpoint scale readings and balanced flow in GPM on one and one-half inch diameter brass valve tags attached to balancing cock with No. 6 bead chain. This tag is in addition to valve identification tag called for elsewhere.

3.3 AIR DISTRIBUTION SYSTEM PROCEDURES

A. Record voltage and amperage draw of each fan motor over 1/10 horsepower.

B. Verify that the air handling equipment performs as specified. Adjust variable type pulleys, volume and control dampers. Provide required exchanges of pulleys, drives, belts and add dampers where required. Record sizes of final belts and drives.

C. Record required data for all fans over 100 CFM capacity. Measure flow by duct traverse at discharge duct or filter bank. Plot operating point on manufacturer's curve and include with report.

D. Measure and record operating capacity by duct traverse on all supply branch ducts handling more than 4000 CFM.

E. Adjust dampers, diffusers, registers, grilles, and fan speed to distribute the design flow within plus ten percent to minus ten percent of the indicated flow in the proper pattern. At least one volume damper in the system shall be one hundred percent open. Adjusting fan capacity by closing volume dampers is not acceptable.

1. Constant volume systems with filters:

a. If sufficient fan capacity is not available to obtain desired flow, distribute shortfall equally amongst all terminal units.

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b. At completion of terminal unit balancing, measure clean filter pressure drop across each filter bank. Simulate dirty filter pressure drop of double the clean filter pressure drop at each installed filter. Record air handler CFM and static pressure at that condition. Plot on curve with balanced condition.

2. Constant volume systems without filters (i.e. exhaust systems):

a. If sufficient fan capacity is not available to obtain desired flow, distribute shortfall equally amongst terminal units. Provide rated airflow in indicated hazardous or safety locations for electrical or health requirements.

3. Variable Air Volume systems:

a. Balance each terminal unit at manufactures recommend inlet static pressure. If setpoint pressure is not available at maximum fan flow and other boxes at maximum design, close boxes serving dissimilar zone types to minimum position until static pressure is achieved. Record VFD speed of fan when all boxes are calling for maximum cooling.

b. At completion of terminal unit balancing, measure clean filter pressure drop across each filter bank at maximum box flow rate. Simulate dirty filter pressure drop of double the clean filter pressure drop at each installed filter. Record air handler CFM and static pressure at that condition. Plot on curve.

c. Record fan speed and clean filter pressure drop with terminal units at minimum box airflow.

d. Record fan CFM and static pressure at fan forced to 100 percent speed on VFD with all boxes calling for maximum cooling.

F. Provide instrument test hole fittings in ductwork at locations where insertion of balancing devices into duct work is required.

G. Seal all holes in ductwork used for insertion of balancing devices with plastic or metal clip seals specifically manufactured for that purpose. Sealing holes with silicon sealant or duct tape is specifically not permitted.

END OF SECTION

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C. Instruments utilized in the balancing procedure must have been calibrated within a period of six months, or as otherwise recommended by the equipment manufacturer, and checked for accuracy prior to start of Work. Make maintenance and calibration r...