A Walk Through the Residential Design Series (ACCA Manuals J, S, and D) with Ed Janowiak

August 25, 2024

Join Ed Janowiak as he delivers an insightful presentation on "A Walk Through the Residential Design Series (ACCA Manuals J, S, D)" at the 5th Annual HVAC/R Training Symposium. In this informative session, Ed breaks down the essential components of proper HVAC system design using the ACCA manuals.

Key topics covered:

Overview of Manual J (load calculations)
Understanding Manual S (equipment selection)
Exploring Manual D (ductwork design)
Common misconceptions and mistakes
Tips for achieving predictable results

Ed’s engaging presentation style and wealth of experience make complex concepts easy to understand. Whether you’re new to HVAC design or looking to refresh your knowledge, this video offers valuable insights into designing efficient and effective residential HVAC systems.

#acca #acca manuals #equipment selection #hvac #HVAC design #Load Calculation #manual d #Manual J #Manual S

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Chris Hughes and Steve Rogers from The Energy Conservatory discuss TEC’s TrueFlow technology and its crucial role in predicting airflow issues in the sales process, particularly for heat pump retrofits. They explain how the TrueFlow app helps contractors accurately measure both static pressure and airflow in existing systems, enabling them to predict whether proposed equipment changes will work effectively. This is especially vital when considering the growing trend of replacing gas furnaces with heat pumps, as the airflow requirements can differ significantly.

The conversation delves into a detailed example of replacing an 80% efficient 48,000 BTU furnace with a heat pump. They demonstrate how the airflow requirement would nearly double from 652 CFM to 1,200 CFM, potentially causing the static pressure to quadruple due to Fan Law 2 principles. This dramatic increase could lead to significant performance issues if not properly addressed during the system design phase. The experts emphasize that using TrueFlow during the sales process allows contractors to identify potential problems and necessary modifications before installation rather than discovering issues during callbacks.

The discussion also covers the ideal workflow for system assessment and sales, starting with customer comfort evaluation and proper load calculations. It’s important to reduce loads through envelope improvements when possible, particularly in cold climates where heat pump retrofits are becoming more common. Proper system sizing often means going smaller rather than larger, contrary to common industry practices, and the worst HVAC systems are often found in expensive custom homes rather than tract housing.

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TrueFlow technology and its role in system forecasting
Fan Law 2 and its impact on static pressure when changing airflow
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The relationship between airflow and static pressure
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Check out TEC’s YouTube channel at https://www.youtube.com/@energyconservatory, and you can visit TEC’s website at https://energyconservatory.com/.

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A Walk Through the Residential Design Series (ACCA Manuals J, S, and D) with Ed Janowiak

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