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Thread: Wire Humidistat Directly to Dehumidifier

  1. #1
    DIY Member K2's Avatar
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    Default Wire Humidistat Directly to Dehumidifier

    Hello,

    I need some help wiring my humidistat to the dehumidifier.

    I'm using the H46C from Honeywell, and I have a Santa Fe Impact dehumidifier. The humidistat is in the basement finished room and the dehumidifier is in an adjacent unfinished portion of the basement. It is ducted to the the finished room.

    I have wired it as noted in the Honeywell diagram connecting to the dehumidifier, yet the compressor never actually kicks on, no matter WHAT RH% level I choose. The fan 'always on' button will start the fan. I feel like the diagram is incorrect, or I'm getting my wires crossed (too much pun for Saturday night?).

    here is the thermostat wiring diagram: http://cache.air-n-water.com/manuals...l-h46e1013.pdf

    here is the wiring diagram for the dehumidifier (page 7 is wiring diagram): http://www.sylvane.com/images/prodph...ier-manual.pdf

    Any help would be appreciated, I'd like the entertainment room to be somewhat DRY for the game tomorrow!
    thanks,
    kurt

  2. #2
    IBEW Electrician big2bird's Avatar
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    Use the schematic for the unit. Ignore the Honeywell diagram. #8 is one side of the stat, #13 & #14 tied together is the other side of the stat.
    Verify the stat is rated for 120v "line voltage."

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    DIY Member K2's Avatar
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    Thanks for the reply. I did validate it is rated for 'line voltage':
    The H46C Humidity Controller is used with portable and
    central unit dehumidifiers to maintain relative humidity.
    The H46 has an spst, snap-acting switch designed for
    line voltage circuits and two leadwires for switch box
    mounting.


    2 clarifying questions:
    1) So if I understand correctly I definitely wired this incorrectly because I connected red from the humidistat to the REd-6 on the compressor, and the black from humidistat to the yellow on the compressor. I SHOULD have taken Red to 13/14 and black to #8. Is that correct?
    2) Since this is a switch, does it matter which way the wires are wired?

    Thanks,
    Kurt

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Without looking at the schematics, if you connected the low-voltage control lines (24vac) to the power inlet of the dehumidifer rather than switching line voltage to it, you may have burned out the 24vac transformer and damaged the dehumidifer. Probably not, but it is possible.

    A SPST switch doesn't care which side is the load or the supply. SPST stands for single pole, single throw, and it's just a simple on/off action that connects to leads together. If it was an electronic switch (something like a triac), it might matter, but if it's mechanical, it doesn't.

    The bigger question is whether that switch is rated to switch enough power - it might only be able to handle a low current load (say a power contactor's coil) verses actually power the humidifer on and off.
    Last edited by jadnashua; 12-16-2012 at 11:40 AM.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    IBEW Electrician big2bird's Avatar
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    Quote Originally Posted by K2 View Post
    Thanks for the reply. I did validate it is rated for 'line voltage':
    The H46C Humidity Controller is used with portable and
    central unit dehumidifiers to maintain relative humidity.
    The H46 has an spst, snap-acting switch designed for
    line voltage circuits and two leadwires for switch box
    mounting.


    2 clarifying questions:
    1) So if I understand correctly I definitely wired this incorrectly because I connected red from the humidistat to the REd-6 on the compressor, and the black from humidistat to the yellow on the compressor. I SHOULD have taken Red to 13/14 and black to #8. Is that correct?Correctr
    2) Since this is a switch, does it matter which way the wires are wired?

    Thanks,
    Kurt
    Bond the ground wire to any metal/ground wires both ends.

  6. #6
    IBEW Electrician big2bird's Avatar
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    Quote Originally Posted by jadnashua View Post
    Without looking at the schematics, if you connected the low-voltage control lines (24vac) to the power inlet of the dehumidifer rather than switching line voltage to it, you may have burned out the 24vac transformer and damaged the dehumidifer. Probably not, but it is possible.
    He has all line voltage controls Jim.

  7. #7
    DIY Member K2's Avatar
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    thanks for your help big2bird

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    IBEW Electrician big2bird's Avatar
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    Quote Originally Posted by K2 View Post
    thanks for your help big2bird
    No problem. Glad I could help.

  9. #9
    DIY Member K2's Avatar
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    Big2bird,
    can i ask a follow up question:
    in the picture below, the clip on the right is the 13/14 (co-joined) and the one on the left, as marked is the blk8.

    Can I simply push the wire from the thermostat through the holes and let the clamps compression fit each one, or would I have to splice it into the wires before it gets to that little terminal? If I have to splice it, would i have to cut and splice all three together? (13/14 and thermostat wire)?

    I'm trying not to hack the electrical more than I already have on this poor dehumdifier.

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    Last edited by K2; 12-18-2012 at 09:31 PM. Reason: picture is upside down.

  10. #10
    IBEW Electrician big2bird's Avatar
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    Those wires are terminated on the units stat. To use your remote unit as control, you need to pull those jumpers off that local stat. Splice one wire from your stat to #8 with a wire nut, and splice the other WITH #13 & #14 together in one wire nut.

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