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

    Oct 28, 2006, 02:15 PM
    Noma programmable T/stat
    Replaced a lever type t/stat (heating & A/C) which had 5 wires connected.
    Orange wire > yellow terminal on T/stat
    White wire > terminal
    Green wire >terminal
    Red wire >terminal
    Black > terminal.
    The new Noma has 4 terminals only Yellow, White, Green & Red. Connected and matched
    Colours using Orange to yellow. Seems to work OK on heat control with black not connected anywhere. (No A/C unit as yet) Anyone know the use of the black wire on lever type? Any potential problems with this wiring as done?
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #2

    Oct 28, 2006, 04:32 PM
    The black may have been a common. For heat only, all you need is the red and white. If the thermostat has a fan on option, you will need the green.
    ivanac's Avatar
    ivanac Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Oct 29, 2006, 10:31 AM
    Thanks. I suppose this means that the Noma uses its own battery supply (2xAA) for its display and electronics. Thanks again.
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