Purpose – This procedure describes how to calculate the quantity of airflow in cubic feet per minute (CFM) being delivered by a fan coil containing…

Purpose — This procedure describes how to determine if airflow across the evaporator in a cooling system is adequate. For proper operation of a cooling…

Purpose – This procedure describes how to measure the temperature rise in fossil-fuel furnaces. Temperature rise is the difference between the return air temperature entering…

Capacitor Checks and Replacement Start and run circuits on single-phase motors use capacitors. Capacitors affect the wattage, amperage draw, torque, speed, efficiency, and power factor…

Both single-phase and three-phase motors are used in residential and light commercial systems. However, because of their good running characteristics and high efficiency, single-phase motors…