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I'm a bit confused with the wiring diagram of this blower motor. Is the COM the neutral wire or the hot wire? And then would the E be neutral if the COM was the hot wire? Or is it the ground?

I thought that since this was a variable speed motor (or so I thought) the wires (speed 1 - 4) all ran current at different levels to control the speed of the motor, then COM would be neutral. So would that mean E was ground?

Wiring Diagram

isherwood
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Lenny
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  • I've found a number of diagrams with all the wires except the grey "E" wire. While guessing is a bad thing to do, my guess is that "E" stands for "Enable", i.e., a way to turn the fans off with a single line. – Duston Aug 19 '22 at 13:23

2 Answers2

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Probably, yes: COM usually stands for common, meaning neutral. E usually stands for Earth, meaning ground.

Paul
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    And the hot wire is connected to **one** of the 4 speeds (at any given time) in order to produce that speed (returning/completing the circuit on neutral/com.) Typically by a control board, or a 1-in-4-out "break before make" switch – Ecnerwal Aug 19 '22 at 13:25
  • Interesting that something that claims that it `Conforms to UL Std. No. 507` would use "COM" and "E" instead of "Neutral" and "Ground". UL is US-based and COM & Earth are not common terms in the US. Of course, it could be manufactured elsewhere in the world by a non-US based company and that may have been there and was simply approved by UL. Still... a little odd. – FreeMan Aug 19 '22 at 15:52
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    Also interesting that there's (crudely printed, so not as clear as they might be) ground symbols that are not explicitly connected to the E - so E *could* be something other than Earth/Ground. Get out the ohmmeter... – Ecnerwal Aug 19 '22 at 16:35
  • I always assumed ground was represented as G or with the symbol. First time seeing E being used. Thanks for all the help – Lenny Aug 20 '22 at 01:04
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I was assuming this was an HVAC blower, but this is actually a remote blower module for a range hood.

Installation instructions located here: Zline T95 Dual Remote Blower

The unit appears to be powered remotely from the range hood, where the control board and buttons are. It also appears to supply the cable. In this case, I would definitely assume E means protective earth in the diagram.

Chris O
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