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    alex0826's Avatar
    alex0826 Posts: 1, Reputation: 1
    New Member
     
    #1

    Aug 17, 2008, 07:09 PM
    Trying to upgrade old 8 wire thermostat to new digital
    Hi, I thought this would be a breeze since I build computers, looks like I was wrong :confused: I took the old thermostat apart to expose the wires and noticed that in the instructions, there is no mention about 8 wire hook ups? Don't know what I'm doing at this point, and from what I can figure, some wires have to be combined or excluded, because the new digital thermostat doesn't have as many connections? I bought the Hunter 44260 and I have the
    Carrier 4.0AQ030300BB
    Volts 208/230
    w/aux heat

    I hope my blabbering didn't make this any more confusing...
    Thanks for your time.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
    Ultra Member
     
    #2

    Aug 17, 2008, 08:58 PM
    When you take the junk(hunter ) tstat back where you got it,ask for a good honeywell tstat that will do what you need,, if its battery operated,you can do away with the common/c post,also if your system operates on 1 transformer,you can jumper the r/c and r/h which should be red (hot) wire and you have done away with 2 of the wires,now all you have to hook up is 6 wires,, goodluck
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #3

    Aug 18, 2008, 01:42 AM
    Quote Originally Posted by alex0826
    Hi, I thought this would be a breeze since I build computers, looks like I was wrong :confused: I took the old thermostat apart to expose the wires and noticed that in the instructions, there is no mention about 8 wire hook ups? Don't know what I'm doing at this point, and from what I can figure, some wires have to be combined or excluded, because the new digital thermostat doesn't have as many connections? I bought the Hunter 44260 and I have the
    Carrier 4.0AQ030300BB
    Volts 208/230
    w/aux heat

    I hope my blabbering didn't make this any more confusing...
    thanks for your time.

    Here is some reference when you get a better/correct thermostat.
    Attached Images
  1. File Type: pdf Older%20systems%20and%20base%20signals%20on%20newer%20ones.pdf (21.4 KB, 994 views)
  2. File Type: pdf heat pump wiring.pdf (13.3 KB, 848 views)

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