Watch a webinar video on measuring HVAC performance. This webinar discusses:
- Setting up the gauge
- ACCA Standards
- External Static Pressure
- Duct Test with blower door & flow hood
- Total system flow measurements
- Commissioning an HVAC system
- Manual J & Infiltration
Sign up for live webinars, or view additional previous webinars from Retrotec. To talk with a sales representative about your specific needs, call 1 (855) 738-7683.
Setting Up the Gauge
Proper gauge setup is foundational for accurate HVAC testing:
Calibrate your digital pressure gauge before testing
Connect the gauge to appropriate ports and verify proper tubing connections
Familiarize yourself with gauge functions such as zeroing, range settings, and data logging
A correctly set gauge ensures reliable pressure and airflow readings.
ACCA Standards
The video highlights the importance of adhering to ACCA (Air Conditioning Contractors of America) standards in HVAC testing, including:
Guidelines for measuring airflow and pressure
Best practices for system balancing and commissioning
Compliance requirements that support energy efficiency and occupant comfort
Following ACCA standards helps maintain industry consistency and quality.
External Static Pressure Testing
External static pressure measures the resistance against airflow within ducts and components:
Perform tests at system supply and return points
Identify pressure drops that indicate blockages, leaks, or undersized ducts
Use results to troubleshoot system inefficiencies and improve design
Accurate external static pressure testing is key to diagnosing system performance issues.
Duct Testing with Blower Door and Flow Hood
This section covers combined use of:
Blower door tests to pressurize or depressurize the building envelope
Flow hoods to measure airflow at registers and ducts
Together, these tests provide a full picture of duct leakage and air distribution effectiveness.
Total System Flow Measurements
Measuring total system airflow confirms whether the HVAC system delivers the intended volume of air:
Use flow hoods and duct testers for precise measurement
Compare airflow to design specifications and Manual J calculations
Adjust system components as needed for balance and efficiency
Commissioning an HVAC System
Commissioning involves validating that the HVAC system operates as designed:
Verify airflow, static pressure, and temperature control
Confirm duct tightness and sealing through leakage tests
Ensure system controls respond properly and deliver occupant comfort
Proper commissioning reduces callbacks and extends equipment lifespan.
Manual J and Infiltration Considerations
The video emphasizes integrating Manual J load calculations and building infiltration factors:
Use Manual J to size equipment based on heating and cooling loads
Account for infiltration to prevent undersized systems and inefficiencies
Incorporate test data to refine design and verify assumptions
