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-   -   Replacing intertherm with honeywell rth7500d (https://www.askmehelpdesk.com/showthread.php?t=406117)

  • Oct 14, 2009, 07:51 PM
    bubs58
    Replacing intertherm with honeywell rth7500d
    I have a nordyne/intertherm thermostat on heat pump hvac system.
    Has seven wires: E- emerg heat
    W- aux heat
    O- RVS Cooling
    G- Fan
    R- 24 Vac hot
    C- 24 VAC Comm
    Y- Heat/Cool

    The Honeywell has the following designated connection points, C, G, Y, O/B, RC, R, W2, E2, L

    Can someone tell me what wires on intertherm corresponds to ones on honeywell?
    Thank you,
    Dana
  • Oct 14, 2009, 09:01 PM
    hvacservicetech_07

    Wire for wire should do the trick. Nothing will connect to the "L" terminal,put a jumper wire between "W2 and E2" and connect whatever is on "W" to those terminals. "O" on the old stat will go to O/B on the new. Good luck!
  • Oct 14, 2009, 09:03 PM
    hvac1000
    PS you might have to select either O or B in the thermostat setup.
  • Oct 15, 2009, 07:53 PM
    bubs58
    Quote:

    Originally Posted by hvacservicetech_07 View Post
    Wire for wire should do the trick. Nothing will connect to the "L" terminal,put a jumper wire between "W2 and E2" and connect whatever is on "W" to those terminals. "O" on the old stat will go to O/B on the new. Good luck!

    Thank you for the reply but it doesn't explain what to do with the "E" wire from the intertherm. That's designated emerg heat. Since I would be tying the W wire to both W2 and E2 that doesn't leave me a place for the E:)

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