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Joined: Wed, Apr 8th 2015, 03:52 Roles: N/A Moderates: N/A

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Topic Author Posted On
Air Conditioner RFI KD4LN on 9/12/17
I am now having to replace our central HVAC. My search shows all high SEER units have pulse width motor controls for compressor, condenser fan and air handler fan. I’m planning to work with the installer to connect common mode filters right at AC input to speed controllers. Each one must be designed for load. Earth is on sep. winding. For high current 240vac filter, large FT-240 toroid wound for L1 & L2. Neutral and earth on own toroid. My power line filtering experience has shown better results with earth not wound with hot and neutral. Unsure about this stuff, ask for help! Please don’t get hurt! 73, W5GLO, Marvin

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