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  1. #1
    Join Date
    Oct 2005
    los angeles calif
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    herman nelson unit ventilator 1981

    does anyone have a wiring diagram for a old mcquay unit ventilator, model SPMAJBBBSG 3013-8200. ive purchased a new speed transormers and motors from DMG CORP, but i have no wiring diagrams no literature of any kind not even with the new parts. TRANSFORMER PART NUMBER IS 4EPB7716.

  2. #2
    Join Date
    Jun 2011
    Houston area
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    The old McQuay unit vents came in many different flavors, a 500 cfm, 750, 1000, 1250 and 1500 and a 2000 cfm ceiling mount horizontal model. They also came in a wide array of heat/cool and economizer options. I can't make heads or tails of the model no. Do you have any idea which specific unit you have? They are easily identified by the cabinet length and number of fans. If memory serves they had a transformer that sometimes had 10 or 15 different speed taps.

    I might be able to point you in the right direction to find a generic diagram for your unit.
    The picture in my avatar is of the Houston Ship Channel and was taken from my backyard. I like to sit outside and slap mosquitos while watching countless supertankers, barges and cargo ships of every shape and size carry all sorts of deadly toxins to and fro. It's really beautiful at times.....just don't eat the three eyed fish....

    `. .` .>(((>

    `... `. .` .>(((>

    .` .>(((>


  3. #3
    Join Date
    Jul 2001
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    McQuay was not involved with HERMAN NELSON in 1981 it was still AAF

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