I’m an electrician by trade but i have a friend who needed his blower motor replaced. The parts store sold him a motor but it only has one hot leg. The control board has a hot for cooling and a hot for heating. What would happen if I wired them both together to the hot for the motor? I’m afraid back feeding the control board might fry it? Any suggestions would be appreciated.
Blower Motor Heat and Cool Control Board
hvac
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Best Answer
It'd be fine, simply because I can't think of a 120 volt AC relay that would be damaged by getting back fed power. Mechanical and solid state can both handle it as far as I know. That's not a 100% you're good though, maybe 90+% confidence?
Worst case it passes current backwards through to hot and won't be able to shut itself off, but you'll catch that during testing. Nothing should blow up.