Connecting extractor fan to controller

Discussion in 'The Projects Forum' started by trecital, Apr 22, 2012.

  1. trecital

    Thread Starter New Member

    Apr 21, 2012
    1
    0
    Hi, I want to connect an extractor fan to a controller with humidity sensor and run-on timer.

    The connection diagram that came with the unit has me a bit confused. The live and neutral connections are obvious,
    but the connector for the fan is marked as NO, NC and C, which I understand to mean Normally Open, Normally Closed and Common.
    However, that still leaves me blank on how to connect the two wires from the fan!!

    Any help would be great.

    The control unit is by S&P, called HYGRO 2. Photos of connections and wiring diagram below.
     
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  2. MrChips

    Moderator

    Oct 2, 2009
    12,446
    3,362
    Connect the fan as shown in the left-hand diagram.

    AC LIVE comes into C.
    Connect FAN to NO. The return wire from the fan goes back to the AC NEUTRAL.

    When the humidity exceeds a certain level the fan is turned on.
    If this is operating in the opposite manner, connect the FAN to NC instead of NO.
     
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