ACCA Standard 310 introduces a protocol for grading HVAC systems, emphasizing energy efficiency to qualify for tax credits. While energy raters conduct the grading, HVAC technicians play a critical role in setting systems up for success by ensuring optimal installation and design. One key metric under this standard is blower fan watt draw, which can be tested using tools like plug-in or clamp-on wattmeters. Technicians may not directly measure watt draw but can influence it through field practices, particularly by minimizing static pressure in ductwork to reduce energy consumption and extend the lifespan of ECMs (electronically commutated motors).

ECMs differ from PSC (permanent split capacitor) motors in efficiency and performance. ECMs are more efficient, despite having a lower power factor, due to their unique electronic control mechanisms, which avoid power "fighting itself" during the electrical cycle. Proper ductwork design is crucial to prevent ECMs from ramping up excessively to maintain airflow, which increases power draw and reduces longevity. For technicians and installers, ensuring low static pressure and correct system setup is vital, not only for meeting energy standards but also for supporting the overall efficiency and durability of HVAC systems. Click here to read more.