3 port valve question

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5 Oct 2008
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Why do 3 port valves need a neutral wire to the actuator? I understand why an earth is used, as with the honeywell v40437, as it has a metal lid, but why a neutral? just curious!
 
Because electricity has to travel in a circuit!

Without a neutral the motor wouldn't be able to turn and the valve wouldn't work!
 
The motor needs the neutral to complete the circuit that makes it turn.

Without a neutral nothing will move.
 

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