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    aztinter's Avatar
    aztinter Posts: 6, Reputation: 1
    New Member
    		  
    #1

    Jan 25, 2009, 09:33 AM
    Installing new thermostat HW RTH7500
    Confused on wiring. See pics not sure where to put White and black wire in new tstat.
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    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 25, 2009, 10:17 AM
    The white wire is on W on the thermostat sub base pic but I do not see a black wire?
    aztinter's Avatar
    aztinter Posts: 6, Reputation: 1
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    #3

    Jan 25, 2009, 01:01 PM

    How about the wire going to O?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Jan 25, 2009, 01:26 PM
    You only use the wires that come out of the wall on the old round thermostat when you replace it with the new one since no new wires have been added. NOW if you have installed a totally different NEW system then you will have to change the thermostat cable if you need more wires for control.
    aztinter's Avatar
    aztinter Posts: 6, Reputation: 1
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    #5

    Jan 25, 2009, 02:01 PM

    I understand that the white wire goes to w, red to r, yellow to y, green to g, there are spots for those on the new, however on the new tstat o/b and w share the same spot. Where do I put the wire that went to the O on the old the old one on the new one?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #6

    Jan 25, 2009, 02:19 PM
    That wire looks blue to me. LOL Land it on the O/B terminal and do the thermostat setup to adjust from O to B.

    Page 17 see 0190 on this doc that came with your thermostat.

    http://customer.honeywell.com/techli.../69-2221EF.pdf

    Read advance setup



    You need to READ the entire install doc since many different settings have to be made once installed. This thermostat does not auto adjust anything. System select and all else has to be done by you or it will not work correctly.
    aztinter's Avatar
    aztinter Posts: 6, Reputation: 1
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    #7

    Jan 25, 2009, 02:40 PM

    If I put the blue wire in the o/b spot where does the white wire go. Do I put them in the same spot?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #8

    Jan 25, 2009, 03:24 PM
    See page 23 alt heat pump locations. Please read you manual. It will make it so much simpler for you if you read your manual. Wire according to number 6 and read what it says and look at the picture.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #9

    Jan 27, 2009, 06:57 AM

    White/heat(w) goes to "W".
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