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Reviews (1)
Jul 20, 2021
Updating blower motor on gas furnace
I was replacing a PSC-style motor in my furnace blower which ran very hot and had failed multiple times. This ECM motor has excellent documentation provided on how to do the modification and also provided the required jumpers and connecting cables. My only issue with the motor is it not having power factor correction. In researching these motors, it is apparent that none of them do. This technology apparently was developed by GE and now under Regal Beloit Co. I ran across a white paper by Regal Beloit Co.about improving the power factor by addition of a series choke in line with the power feed for the motor. The problem with the design of the motor power supply is that it draws current in huge spikes; 27A at 120V, according to the paper. I feel that these high-current pulses will fail the motor's filter capacitors prematurely. With the addition of the choke, these spikes drop to 19A. The paper makes choke-value recommendations. I made my own choke and installed it. Running from my solar inverter, the reduction in SYSTEM power loss was dramatic: 936W dropped to 615W, and speed increased slightly. The SYSTEM power loss with the PSC motor was 1200W, and the speed was lower. Just a note about SYSTEM power. The power figures I detailed include losses in the solar inverter, which are probably responsible for most of the differences. But it does indicate the importance of power factor on the power generation and transmission side.