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

    Jan 5, 2010, 09:59 AM
    Installing new Honeywell rth2300 thermostat
    I just replaced an old digital thermostat with a new programmable honeywell. The wires coming out of the wall are as follows:
    Red
    White
    Blue
    Green

    In the old thermostat they were connected as follows:
    Red:Rh (jumpered to RC)
    White:W
    Blue:Y
    Green:G

    The unit is a gas heater/AC unit. I called honeywell about this but just want to double check. The new honeywell unit does not have an RH or RC terminal, just an R. Honeywell told me that I don't have to jumper in this new unit because just plugging the red wire into the R terminal will take care of it. They said it would only be problematic if I had separate wires coming into the house to the RH and RC terminals. The heat is running fine right now so I feel they are correct. Do I need to just put the old unit back up or are they correct?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 5, 2010, 10:10 AM
    Do I need to just put the old unit back up or are they correct?

    If the new thermostat is functioning properly I see no problem. You do not have separate R terminals to worry about so stop worrying.
    aadepa's Avatar
    aadepa Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Jan 5, 2010, 11:06 AM

    Great. Thanks. My concern I guess is whether it will affect the AC when we run it. I would test it but since it is below zero out the manual recommends against that.
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