5.3003.21 Air Flow—Low Rise

Topic: 
Forced Air
Subtopic: 
System Assessment and Maintenance
Desired Outcome: 
Air flow is properly tested
For supporting material, see Referenced Standards.
TitleSpecification(s)Objective(s)
5.3003.21a
Validate air distribution system installation

System will be checked for existence of specified system components

Confirm installed system

Become familiar with system components

Verify system readiness for testing

5.3003.21b
Testing equipment selection

Measurement equipment will be selected so that design value will be within the accurate range of the measuring device

Equipment will be capable of accurately measuring +/- 10% in general case

Measurement equipment will be calibrated and field checked in accordance with manufacturer recommendations

Ensure accurate measurements of airflow rates

5.3003.21c
Test air handler unit

Equipment testing will check for:

  • Proper operation (programmed schedule/sequence of operation)
  • Proper rotation

All measured values will be recorded and compared against design specifications

Fan flow will be adjusted to meet design specification

Verify performance of air handler system

5.3003.21d
Total air flow

Total system airflow will be measured in accordance with ANSI ANSI American National Standards Institute, www.ansi.org / ACCA ACCA Air Conditioning Contractors of America, www.acca.org Standard 5 or ANSI ANSI American National Standards Institute, www.ansi.org / ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org Standard 111 and adjusted to meet design requirements

Examples of acceptable methods include the following:

  • Temperature rise test
  • Air flow plate (e.g., TrueFlow® Air Handler Flow Meter)
  • Fan pressurization device (e.g., Duct Blaster®, DuctTester)
  • Hot wire anemometer

Ensure equipment operates as designed

Ensure equipment operates efficiently

Ensure equipment provides comfort

Ensure equipment operates safely

Ensure equipment is durable

5.3003.21e
External static pressure

External static pressure will be in accordance with manufacturer specifications

Ensure equipment operates as designed

Ensure equipment operates efficiently

Ensure equipment provides comfort

Ensure equipment operates safely

Ensure equipment is durable

5.3003.21f
Pressure drop: coil

Pressure drop across cooling coils will be in accordance with manufacturer specifications

Ensure equipment operates as designed

Ensure equipment operates efficiently

Ensure equipment provides comfort

Ensure equipment operates safely

Ensure equipment is durable

5.3003.21g
Pressure drop: filter

Pressure drop across filter will be in accordance with manufacturer specifications

Ensure equipment operates as designed

Ensure equipment operates efficiently

Ensure equipment provides comfort

Ensure equipment operates safely

Ensure equipment is durable

5.3003.21h
Balance of room flow: new ductwork

Airflow will be measured in accordance with ANSI ANSI American National Standards Institute, www.ansi.org / ACCA ACCA Air Conditioning Contractors of America, www.acca.org Standard 5 or ANSI ANSI American National Standards Institute, www.ansi.org / ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org Standard 111 and adjusted to meet design requirements

Examples of acceptable methods include the following:

  • Air flow will be measured at each register and compared to load calculation to ensure proper air flow delivery
  • Adjustments will be made to fan speed, dampers, and registers until design specifications are met

Ensure equipment operates as designed

Ensure equipment operates efficiently

Ensure equipment provides comfort

Ensure equipment operates safely

Ensure equipment is durable

5.3003.21i
Supply wet bulb and dry bulb

Supply wet bulb and dry bulb air temperatures will be recorded

Ensure equipment operates as designed

Ensure equipment operates efficiently

Ensure equipment provides comfort

Ensure equipment operates safely

Ensure equipment is durable

5.3003.21j
Return wet bulb and dry bulb

Return wet bulb and dry bulb air temperatures will be recorded

Ensure equipment operates as designed

Ensure equipment operates efficiently

Ensure equipment provides comfort

Ensure equipment operates safely

Ensure equipment is durable

5.3003.21k
Temperature rise: gas and oil furnaces only

Temperature rise between the supply and return will be in accordance with manufacturer specifications

Ensure equipment operates as designed

Ensure equipment operates efficiently

Ensure equipment provides comfort

Ensure equipment operates safely

Ensure equipment is durable

5.3003.21l
Final balance

Final air flow and/or pressure will be measured, confirmed, and recorded at air handler and registers

Airflow will be measured in accordance with ANSI ANSI American National Standards Institute, www.ansi.org / ACCA ACCA Air Conditioning Contractors of America, www.acca.org Standard 5 or ANSI ANSI American National Standards Institute, www.ansi.org / ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org Standard 111 and adjusted to meet design requirements

Provide acceptable thermal comfort, energy efficiency, and indoor air quality

5.3003.21m
Occupant/property manager education

Occupant/property manager will be:

  • Instructed on proper operation and maintenance procedures
  • Educated on value and need for recommissioning requirements
  • Property manager will complete a 30-hour OSHA OSHA U.S. Occupational Safety and Health Administration, www.osha.gov safety education course

Ensure continued operation of equipment at design performance levels