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In this HVAC Training Video, I Show How the Blower Motor is Controlled by the Relays on a Furnace Control Board. I Show Wiring They're switches that switch on or off when power is applied to them. Power from one circuit (often low voltage) is used to energize an electromagnet inside Don't have the big fancy tools!? Don't worry, I got you in this awesome life hack for testing your relays!
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