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METHODOLOGY FOR

TESTING, ADJUSTING & BALANCING (TAB) on HVAC SYSTEMS

A: PRE-ENGINEERING, SCHEDULING

Upon receiving the required project documents, AICL will select the applicable methodology and design a projectspecific “TAB” procedure, then schedule site visits to verify allocation of all “TAB” related accessories, and to co-ordinate “TAB” work with the Trades.

AICL will also attend on site meetings to verify the methodology with the Design-Consulting Engineer and Commissioner.

Actual “TAB” work to commence following post facility start-up.

B: AIR BALANCING

The “TAB” engineering (BTA) crew or technologist (BTT) crew will receive instructions from project manager regarding the job-schedule, methodology, tolerances, diversities, outside air requirement and design intent. Trades’ representatives for the project and other pertinent job related conditions, such as safety, will be also consulted. Further site co-ordination will be accomplished by the BTE or BTT crew leader, as required.

The “TAB” testing format (NBCTA formats are utilized) will also completed having the designer, manufacture and calibration (where required) information for all systems, all in an organized manner. The “TAB” testing instrumentation will be verified and the site work may begin.

Site work: Commences with a walk through inspection of the building and equipment data registration. Prior to the balancing work, familiarization with the control system set-up and schedule co-ordination with the control trade interaction will also take place. Then the methodology will be applied and the “TAB” work begins.

Deficiencies: Performance related deficiencies should be solved according to the methodology. Physical shortages in the installation shall be reported to the correspondent trade with a fixed-time for resolution. When system’s performance tests results are satisfactory, the completed test formats will be passed for reporting.

Reporting shall be provided for the control company, giving them the system’s pressure, calibration and automatic damper positioning required to operate according to design.

Note: We inspect the final computer print-out for the set-up in operation.

Deficient items, after they are fixed, will be re-tested.

Non-satisfactory performance data (report) shall be discussed with the designer (site inspector).

C: HYDRONIC BALANCING

Hydronic and thermodynamic balancing of Cooling, Heating and Heat recovery systems are also our specialty; we have extended experience with them. The hydronic “TAB” work requires measuring devices, which need to be well sized and placed.

Temperature differential based “TAB” work is not a preferred arrangement.

Prior to the hydronic “TAB”, the procedure is similar as described for air balancing and adjusted for each season. The hydronic “TAB” methodology shall include diversity, control trade interaction and pre-conditions of the systems hydronic related readiness.

Site work procedures are similar to those described for air “TAB” work.

 

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