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

    Oct 13, 2009, 06:35 AM
    Noma Thermosat
    I just bought a Noma, model no.52-2570-6 programmable thermostat and I am having trouble installing. The original manual thermostat has five(5) wires, green, orange, white, red, and black. The black is not connected to anything at all. The white wire is connected to the terminal marked Y on the old thermostat, the orange wire is connected to the terminal marked G, the green wire is connected to the terminal marked A and the red wire is connected to terminal marked A. Actually the red wire is connected to 2 terminal, one is marked A and the other one is marked nothing. The new thermostat terminal are marked differently (Y, Rc & Rh (these 2 terminal have a little metal piece connected as if they were one), W-O/B , G , H2, H1. Somebody, please help.

    Thank you.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 13, 2009, 06:45 AM
    Before you disconnect or change anything I thought I would mention you have nonstandard color code wiring and this can cause a major nightmear for someone not in the heating trade.

    First of all you have purchased a heat pump thermostat. Do you have a heat pump system?

    What is the exact brand and model number of the old thermostat?

    If you have your heart set on a new thermostat just remember what you might get yourself into with this wiring problem.
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!

Change old thermosat to new one [ 3 Answers ]

Did not label wires from a general control T-90 thermosat Duh! It has a 4 wire line red, blue, white and green. I saw on a earlier post that T-90 has g,f,c,h,v on its sat. The new sat is a honeywell w/ rh, rc,w,y,g. The blue & red wires are hot.

Change old thermosat to new one [ 2 Answers ]

When taking out a T-90 general control thermosat I did not label the wires. Trying to install a new honeywell, its not working. I can't get the old wires in the right order. Blue goes to... Red goes to... Green goes to... White goes to... New sat has Rh,Rc,G,W

My thermosat indicates Return [ 1 Answers ]

My unit comes on. (inside and outside). The thermosat shows "return" and there is no cold air.

Installation of Thermosat [ 1 Answers ]

Hello everyone! I installed a thermosat today and I think (Well I no) that I have the wiring mixed up because the heat is not working. And it's very cold and I really would like some help! Now there are four wires One Green One Red and Two Yellow one's. :eek:

View more questions Search