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    bubs58's Avatar
    bubs58 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Oct 14, 2009, 07:51 PM
    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
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
    Ultra Member
    		  
    #2

    Oct 14, 2009, 09:01 PM

    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!
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Oct 14, 2009, 09:03 PM
    PS you might have to select either O or B in the thermostat setup.
    bubs58's Avatar
    bubs58 Posts: 2, Reputation: 1
    New Member
    		  
    #4

    Oct 15, 2009, 07:53 PM
    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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