Ask Experts Questions for FREE Help !
Ask
    sksmq's Avatar
    sksmq Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Jan 10, 2009, 12:55 AM
    Replacing an old with a new digital thermostat
    Old Honewell T8195B has 1 red, 2 white and 2 green wires. Replacing with new digital honewell Rth230B, marked with Rh, Rc, W, Y and G. Any suggestions how to connect.
    MarkwithaK's Avatar
    MarkwithaK Posts: 955, Reputation: 107
    Senior Member
    		  
    #2

    Jan 10, 2009, 01:00 AM

    Well for starters, what terminals were the wires attached to in the first place?

    If you are unsure then you will have to look at he terminal board on your furnace. The stat wires will correspond with the terminals on your new stat.

    NOTE: You will not see either an Rh or an Rc terminal on your furnace. Just R. In most case you will have to install a jumper wire from Rh to Rc on your stat unless you are using a 2 transformer system.
    sksmq's Avatar
    sksmq Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Jan 10, 2009, 01:16 AM
    Quote Originally Posted by MarkwithaK View Post
    Well for starters, what terminals were the wires attached to in the first place?

    If you are unsure then you will have to look at he terminal board on your furnace. The stat wires will correspond with the terminals on your new stat.

    NOTE: You will not see either an Rh or an Rc terminal on your furnace. Just R. In most case you will have to install a jumper wire from Rh to Rc on your stat unless you are using a 2 transformer system.
    From SKSMQ; Both are for C/A, heating and air with no marking on old
    MarkwithaK's Avatar
    MarkwithaK Posts: 955, Reputation: 107
    Senior Member
    		  
    #4

    Jan 10, 2009, 01:26 AM

    Ok, did you look at the terminals on your furnace where the stat wires terminate? If you can't or won't then there is nothing myself or anyone else on here can do to help you. The wiring colors your submitted do not adhere to the general rule of thumb.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #5

    Jan 10, 2009, 01:28 AM

    <Moved from Electronics>
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Replacing analog thermostat with digital one [ 9 Answers ]

Hi everyone, first time poster here. I just bought a digital thermostat (Honeywell RTH230B) to replace my old Honeywell thermostat. I'm having some problems figuring out what connections to plug it into. Currently I have 4 wires screwed onto the old thermostat - White, Black, Red and Blue. The...

Replacing another digital thermostat with a Hunter [ 6 Answers ]

All right I read a lot of posts with how unreliable the Hunter (model 44110) is, but, I already got this one going at the same time I am doing a Honeywell. (I just asked asked that question separately.) Ok, once again, I have only two wires (black and white) and there are three possibilites for...

Replacing old thermostat w/ new digital [ 1 Answers ]

I am attempting to install a new Hunter Programmable thermostat. After removing the panel on my old TRANE Model Baystat 239 Weathertron thermostat I found quite a few more wires there than on my new one. The old one has the following wires: X2 black O orange G green Y yellow T tan R...

Replacing Analog Thermostat with Non-Programmable Digital Thermostat [ 1 Answers ]

Replacing Analog thermostat with White, Yellow, Red, & Black wiring with non-programmable digital thermostat Model #RTH3100C. Please help!!

View more questions Search