Canadian Associated Air Balance Council

By: Caabc  09-12-2011

Total System Balance

The process of testing, adjusting, and balancing HVAC systems according to design intent. It requires the proper use of instrumentation, the skillful evaluation of readings, and the ability to adjust systems to meet the design criteria. Members must possess the applied knowledge, accurate instrumentation, and extensive field experience necessary to balance all system components for optimal performance.

CAABC Certified Companies have the required personnel, expertise, and instrumentation to provide the following building services:Air Distribution: Air quantities are measured according to AABC National Standards, and outlets are adjusted to design requirements.

Hydronic Balancing

Proportional fluid flow quantities are attained throughout hydronic systems in accordance with design requirements.

Sound and Vibration Testing

Sound pressure levels are measured with a properly calibrated meter in accordance with the contract specifications. Vibration of the HVAC components is measured and recorded for displacement and velocity where required by the project specifications.

Cooling Tower Performance Testing

As part of a complete system balance, the cooling tower is tested to determine its capacity to perform its specified duty. Measurements for cooling tower performance must be highly accurate for safety.

Fume Hood Testing

Proper testing of the fume hood is crucial for a safe environment. Total flow quantities, both exhaust and supply, as well as face velocities, are adjusted in order to achieve effective performance of the fume hood exhaust system.

Verification of Control Systems

Controls are set to a proper fixed mode to prevent any changes during the balancing, and proper operation is verified.

Duct Leakage Testing

This testing must be specified; it is not a required test in accordance with AABC General Specifications. Duct leakage rate is measured and recorded; unusual conditions specified; and leakage source identified.

Pre-Construction Plan Check and Construction Review

These services must be specified in addition to AABC General Specifications; they are not required. These services will assist in achieving design intent; simplify the balance procedures; reduce the time required for balancing; and substantially contribute to more efficient, economical system performance.

Indoor Air Quality

Most IAQ problems are system related and can be traced to poor ventilation. Basic IAQ investigations are performed, and the required air exchange rates are provided to ensure that the facility is receiving the appropriate air quantities.