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    vbrenes's Avatar
    vbrenes Posts: 2, Reputation: 1
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    #1

    Apr 10, 2007, 03:53 PM
    Replacing a 120v analog thermostat with four input trminals with a digital one
    I have an old analog thermostat which controls the heating in my condo. I want to replace it with a new digital thermostat. The present setup has four wires coming out of the electrical box. They are BROWN, BLUE, RED and BLACK. The BLACK wire is connected to the on/off switch. The RED wire is connected to the LO setting of the fan. The BLUE wire is connected to the HI setting of the fan. The BROWN wire is connected to another terminal in the fan switch. Additionally, there's a RED wire from the thermostat to the on/off switch and another RED wire from the thermostat to the fan control switch. The system operates on 120v.

    What do I need?
    vbrenes's Avatar
    vbrenes Posts: 2, Reputation: 1
    New Member
    		  
    #2

    Apr 10, 2007, 03:55 PM
    I have an old analog thermostat which controls the heating in my condo. I want to replace it with a new digital thermostat. The present setup has four wires coming out of the electrical box. They are BROWN, BLUE, RED and BLACK. The BLACK wire is connected to the on/off switch. The RED wire is connected to the LO setting of the fan. The BLUE wire is connected to the HI setting of the fan. The BROWN wire is connected to another terminal in the fan switch. Additionally, there's a RED wire from the thermostat to the on/off switch and another RED wire from the thermostat to the fan control switch. The system operates on 120v. What do I need for the replacement thermostat.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Apr 10, 2007, 09:54 PM
    Old thermostat name and model number?
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