I've got this fan to install as part of a heat transfer system. The fan is controlled by a touch-screen thermostat/control unit and has three speeds.

I understand the supplied wiring diagram, but I'm wondering how best to implement it.

Should I find 4-conductor cable and join the neutral back by the control unit, or run a separate wire for the neutral?

So basically, whats the best way to physically run the wires?


supplied diagram

my idea

1 Answer 1


Since you are running the wires back to the control unit anyway - I would run 4 wires back to the unit and connect them all including the ground in that location.

This should prevent any issue with ground loops.

  • Thanks for that. I've updated my post with my idea how to do it. Will this do suffice?
    – Kokako
    Jan 16, 2018 at 1:26
  • 1
    None of the conductors diagrammed indicate "ground" anywhere. Your fan should have its own grounding connection, assuming it has any exposed metal parts.
    – Upnorth
    Jan 16, 2018 at 6:22
  • @Kokako - you should ground it as well - generally your circulation fan in the air handler is attached to the Air Handler unit and therefore it is grounded to the unit - which is most likely grounded with a grounding wire from the main power panel - run the additional ground wire to your fan. Electrical wire labeling leaves much to be desired. The dash_number indicates insulated conductors - something like 10-4 or 12-4 with ground (5 wires) you need to have a ground for that fan. If the neutral opens you have a high risk of electrocution.
    – Ken
    Jan 16, 2018 at 10:23
  • Sorry guys but I misspoke when I used the word "ground" I meant "natural" the fan is double insulated so no ground is needed. How does my wiring plan look to you now?
    – Kokako
    Jan 16, 2018 at 20:59

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.