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The longer, low-output cycles of an ECM blower break up the stratification of heat at the ceiling and keep warm air circulating throughout the room. When a furnace turns completely off, a layer of rising hot air accumulates at the ceiling and doesn’t provide warmth to occupants at ground level.
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The gradual ramp-up to maximum output and gentle soft stops reduce stress and wear and tear on motor components. Lower maintenance and longer life – ECMs utilize true ball bearings that reduce or eliminate the need for lubrication.While the upfront cost of an ECM is higher than replacing a conventional PSC unit, the expected savings in operating costs will eventually offset the price difference. An PSC motor, on the other hand, has efficiencies of only about 45 percent. Energy savings – An ECM delivers efficiencies in the range of 65 or 75 percent, depending on the output.The motor slowly reaches a maximum output appropriate for the specific thermostat setting and then incrementally decreases output to transition into what’s known as a soft stop instead of an abrupt off.
ECM BLOWER MOTOR FULL
A typical HVAC program signals the motor to ramp up speed gradually in it’s first stage-a more energy-efficient mode than simply turning on at full speed. Output of the motor can be adjusted by signals from a controller, or permanently programmed to advance through a range of speeds during each on cycle of the furnace. Variable speeds – Unlike an on/off PSC motor, a furnace ECM motor can operate at a range of outputs between zero and 100 percent.Here are some of the advantages to upgrading to a furnace ECM motor instead of sticking with the original equipment PSC model: Since its introduction in 1985, the adoption of ECM technology has played a major role in increasing the energy efficiency of furnaces and air conditioners. ECMs are brushless motors developed by General Electric, which owns the trademark on the name. The energy consumption of the motor is therefore fixed at a single maximum rate.Įlectronically commutated motors (ECM) represent an advance in blower motor efficiency that saves substantial energy and improves aspects of overall system performance.
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It’s either running at full output or it’s not running at all. The output of a PSC motor isn’t controllable and it has no intermediate speeds. Short for permanent split capacitor, PSC motors are designed to do what furnace motors have always done in the past: simply turn on and off. On many installed furnaces, the original (OEM) blower motor is a PSC model. Upgrading to a furnace ECM motor when you renew your system avoids that disappointment, as well as the higher utility costs that come with it.
ECM BLOWER MOTOR UPGRADE
Therefore, homeowners who opt to upgrade to a new furnace or A/C yet keep the old-school, inefficient blower motor may discover they don’t receive the efficiency gains they expected based on the published ratings. Yet, when published efficiency ratings for new furnaces and air conditioners are computed in the laboratory, the efficiency of the blower motor isn’t included in the calculation. The same holds true for the air conditioner blower located in the air handler. One of the primary energy consumers in your heating system is the furnace blower motor.