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Change thermostat My old intertherm thermostat has green, red, yellow, white, orange, wires model 1D36, the terminal on the intertherm are G,R, A, Y, W, I'm replacing the intertherm with a honeywell model rth5100b The terminal are mark Rc, R, Y Not used, O/B W, G. Where do I put the orange wire.

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  • Anonymous Feb 22, 2009

    I had a Trane Thermostat that had G, O, X2, Y, R, W, & B. The Honeywell RTH6300B says to use G, W, Y, R. It says do not use B, says nothing about X2, and I think I'm supposed to use O but not sure where to put it. I have a heat pump.

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You have caught me without my old books, but I can tell you the orange wire is for the reversing valve on a heat pump. Almost all manufacturers, except for Lennox, are: R=Power (24volts), G=Indoor fan (Blower), Y=Cooling (A/C), and W=Heat. Some t'stat's are set up to use 2 separate transformers (24 volt), that is why you will see Rc, Rh. This is power for cooling and power for heating. If this is what you have, just take the Red wire and strip it back far enough to go under both screw terminals if the unit is a residential one. I've been doing commercial work for over 20 years and have never seen an "A" terminal, so I can't help you there. You may want to double check that. If I'm reading you correctly, I would put the orange wire on the "O" terminal. Don't understand why the "Y" terminal is not used. It turns on the compressor. The "O" goes to the reversing valve to "Tell" the outdoor unit that it is either in the cooling or heating mode.

Good Luck and let me know if I can help any further.

Posted on Feb 28, 2009

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I have 4 wires green blue red and white my red is connected to the rh rc with jumper green connect to g blue to y1 and white is connected to w1 my new thermostat has no rc rh or a jumper


Paulette, if your new thermostat has no Rc and Rh thats fine. The Red wire should simply go to the R terminal. The Rc and Rh terminals on the old one was for the old 'two transformer' systems. The vast majority of systems now have no need for the Rc Rh terminal and jumper. The rest of your wires connect as on the old stat also.

Jul 31, 2015 | Thermostats

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What color wire is the power terminal


In a thermostat this is the most common arrangement but it is hard to say with out a volt meter. I will give you the most common wire colors. R is the power terminal which is usually a red wire

R = red W=white C =black or blue Y= yellow G= green O=orange
W2= brown or tan Y2= blue

Feb 28, 2015 | Thermostats

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Hey, I purchased your Honeywell RTH2510 Thermostat, but I didn't even think to label the wires when I took the old thermostat off. Upon installation of the new Thermostat (2510) the Air Conditioning...


The connections that you really need to reference would be at the air handler itself. That would tell you which wires go outside to the heat pump and which wires go to the air handler. I can however give you some basics that may help.

Heat Pump Wiring
Terminals/Colors/Function
R- Red- 24v power supply. (Usually a jumper between RC/RH)
G- Green- Fan
W- White- Heat (Sometimes W1-W2, first or second stage heat)
Y- Yellow- Cooling (Same applies as above i.e. Y1-Y2)
C- Common (Most people use blue unless it is used for B terminal and sometimes cooling on older 4 wire systems.
B/O- Reversing Valve for heat pump. Either powered heating or powered cooling, depending on system installed.
Aux- Also used for heat.

Note: Considering that the installer had their own way to run all wires, use different wires, connections, etc. This is just a reference to common wiring in the field.

How the most common system is hooked up:
Thermostat:
Red wire goes to R terminal
Yellow wire goes to Y1 or Y2 terminal
Green wire goes to G terminal
White wire usually goes to W1 or W2 terminal
Orange or Black wire goes to B/O terminal
Brown wire usually goes to Aux terminal
Blue wire goes to C terminal, unless its being used as stated above.

This is without using a fossil fuel kit or zone control board.

Where do they go from the thermostat?
Red
goes to the air handler transformer or board and goes outside to heat pump to power low voltage controls.
Yellow wire goes straight outside to Y terminals on heat pump unless going to a board inside first.
Green goes to the air handler fan relay.
Common goes to the air handler and outside to heat pump.
Black or Orange will go outside to heat pump terminals for reversing valve.
White usually goes outside to heat pump,and inside to air handler. Will explain reason further down.
Brown will go to the air handler to the heat relay for the emergency heat.

On a call for heat, with a powered cooling system (more common).
The R, Y, and G terminals energize, sending a signal to start the blower and pull in the contactor outside. Note that the Y terminal is usually cooling, but since this is a powered cooling system, the reversing valve is not energized, causing the system to run in heat mode. If you have powered heating, the reversing valve terminal will energize also. Depending on thermostat, if you set the temp substantially higher than room temp, it may kick on the emergency/aux heat to quickly raise the room temp. On a call for emergency/aux heat, the R, G, and E/Aux terminals are energized, turning on the electric/gas heat instead of the heat pump. This comes in handy since the heat pump can only pull so much heat from outside before its not enough to properly warm the house, usually around 30 degrees outside temp. If you are running the heat pump and the system goes into "defrost", the outside unit will send a signal back to the air handler, through the white wire I mentioned earlier, to tell the emergency/aux heat to come on while it is in defrost mode, providing heat whenever needed.

Again, this is just a reference guide to some basic wiring, but hopefully it will tell you where the problem is or at the least, give you a good start. There are variables in which things can change the wiring like a zoning system or fossil fuel kit. Even then, you should be able to get pretty close. Hope this helps and Happy Holidays!

Dec 07, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

How to set up??


First, you have to make sure that the thermostat is set to conventional and not heat pump. Then, the best way to know where the wires go, is to mark what terminals the came off of from the old stat. If that isn't possible, the next best thing to do is go to the unit and see where each wire goes. This is because the wire colors are not exactly set to any certain standard. It's at the discretion of the person installing the system in the first place to use whatever colors they like, to work any part of the system the choose.
The basics/commonly used colors are:
Red- R terminal- Power
Green- G terminal- Fan
White- W terminal- Heat
Yellow- Y terminal- Cooling
Blue- C terminal- Common
Heat Pump Thermostats use more wires, such as:
Orange or Black - O/B terminal- Reversing Valve
Brown- W2/Aux terminal- Heat

My suggestion would be that your black wire is for your cooling(Y), and all other colors wire up to the corresponding terminals. There are many systems that are ran only by 2 and 4 wire setups, therefore, it's possible that whoever ran your wire initially did not have a yellow wire in the strand. Also, if there is a yellow wire in the strand(possible 7wire strand), it could also be that the wire had a short and they switch the wires to bypass the short. Hope this helps and Happy Holidays!

Dec 01, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

My old thermostat has only yellow and red wires...no green and white like my new Honeywell thermostat installation instructions mention. Is this a problem?


The green wire is used to turn on the blower if you want constant air circulation. For heat only, the red and yellow wire will work as long as they are connected to R and W terminals on heating unit (or TH and TW on some models).

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1 Answer

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All you have to do is note which wires are hooked to which terminals and exchange them i.e.-R(Red) to R terminal, Y(Yellow) to Y terminal, etc. The only wires you should need are the Red, Yellow, Green, and sometimes Blue if the thermostat is powered by the unit and not batteries. Here are the most common wiring procedures:

Red(R)=Power
White(W)=Heat
Green(G)=Fan
Yellow(Y)=Cooling
Blue(B/C)=Common/Ground

Hope this helps!

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1 Answer

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