ELECTRONICALLY COMMUTATED MOTORS Part 2: Constant ...

Constant -AIRFLOW, VARIABLE-SPEED (OEM)INDOOR BLOWER ECMsTheconstant-airflow(variable-speed) ECM wasintroduced in 1987 by GE (rebranded Genteq in2009). It was the first and only indoor blower ECMuntil the introduction of the Constant -torque ECM in2006. The term variable-speed motor was coined inthe late 1980s. By function it is a Constant -airflowmotor. Both of these terms define the type or style of ECM and how it is programmed to MOTORS are built in 1 3-, 1 2-, 3 4-, and 1-hp sizes, and only in direct-drive MOTORS have gone through many generationalimprovements in their more than 20 years ofexistence, including advances in reliability andcommunication formats, as well as changes in theirphysical appearance. This chapter covers only thecurrent-generation three main benefits of these MOTORS overconventional induction (PSC) MOTORS are: increased electrical efficiency more precise and unlimited airflow selection (the variable-speed feature)1 ELECTRONICALLY COMMUTATED MOTORSPart 2: Constant -Airflow ECMsby Christopher MohalleyGenteq Certified Master ECM Trainer 2010 by the Refrigeration Service Engineers Society, Des Plaines, ILSupplement to the Refrigeration Service Engineers Application ManualSAM Chapter 650-004 Section 6A 16-pin ECM modelControl moduleMotor module4-pin ECM modelControl moduleMotor moduleFigure 1.

produce the designed capacity. In addition, the system may be prone to problems and/or premature parts failures. Figure 5 shows several examples of HVAC OEM airflow and comfort charts. Thetrim/adjust airflow chart allows the cooling airflow to be tweaked up or down to increase the sensible or latent capability of the cooling system.

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