Home Improvement Asked on March 20, 2021
I have two booster fans that I only want to run when the main HVAC blower fan is on.
Each fan will have its own speed controller.
How do I wire them both to the same current sensor switch? Should I just run two separate lines from each fan and connect them to the relay at the same place, or do I need to run a single cable from the relay with one fan online and one at the end of the run?
What part of the fan should the sensor connect to?
It does not matter if you run two separate cables to the two fans from the same point - two homeruns - or if you daisy chain, with one cable from the switch to the first fan, and a second cable from the first fan to the second. Either way, they'll be in parallel electrically and the load through the switch is the same.
However, you do have another issue. That switch in your link is handy because it's self powered, but it is rated for up to 2.5 amps at 120VAC, so it's really not up to running even one of those 3 amp fans directly.
You could use that current switch to operate the coil of a relay / contactor and have the contacts of that additional relay switch the fans. There are zillions of such devices available, you'd just have to select one that's rated for the application (and of course you'd have to install it correctly).
You can also find current sensing relays that will combine both functions in one device.
Answered by batsplatsterson on March 20, 2021
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