HVAC Surge Protector Installation

Discussion in 'HVAC Heating & Cooling' started by scottmcll, May 31, 2020.

  1. scottmcll

    scottmcll New Member

    Joined:
    Sep 17, 2015
    Location:
    Issaquah, Washington
    I recently had an issue with my split-air HVAC system and with the VERY kind help of those here, was able to ferret out the problem was with blown circuit boards and it was recommended that I install a Ditek surge protector. Got it the other day, and while I'm 99% sure I've installed it correctly, I'd be most grateful if those, here, with corresponding experience would just have a look and confirm that it's right before I energize that circuit.
     

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  2. scottmcll

    scottmcll New Member

    Joined:
    Sep 17, 2015
    Location:
    Issaquah, Washington
    Forgot to add the install illustration provided with the protector. Also, the line in from the panel is on the lower right. Line on the lower left is to the HVAC outdoor unit.
     

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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    It appears that the diagram has the surge suppressor connected to the outlet of the fuses, but it should work either location. If you had a big enough surge to blow the fuses, though, it would provide more protection on the a/c side of the fuses. I have a similar device wired into my power panel so that it protects the whole house. I still use individual devices on expensive items, though.
     
  5. Stuff

    Stuff Well-Known Member

    Joined:
    Mar 7, 2013
    Location:
    Pennsylvania
    As mentioned you wired the SPD on the line side and the drawing shows wiring it on the load side. There is a code issue with the double tapped lugs which is a common call-out on inspection findings. Unless you have something from the manufacturer that says otherwise the lugs on the disconnect are not rated for multiple conductors. Notice the drawing does not show any other wires under the lugs and the directions state "8. Connect the phase (Black) wires to the load side of a 2 pole breaker." This is how Ditek can say they did not tell you to break any rules. It is ugly but the proper way is to add splices so each wire is using a single lug. A fussy inspector could say even the ground bar is not listed for multiple wires.
     
  6. fitter30

    fitter30 Well-Known Member

    Joined:
    Feb 2, 2020
    Occupation:
    Retired service tech
    Location:
    Peace valley missouri
    Strange disconnect fed from the bottom line out the top?
     
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