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Changing thermostat matching wires trouble

Old thermostat:Protech colors: brown, red, yellow, white, green, orange and blue.
New thermostat:  Hunter inputs: G,Rc,Rh (with opt. jumper), o,b,w,y
I need to know how to match them up exactly right. I think Rc is red, g=green, 0=orange, w=white,  y=yellow ??? Where does brown go? Please  fix me!

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Brown my friend is for the 4 way valve solenoid, that is if you have a heat pump, ( it uses freon for heating instead of natural gas) perhaps you got the wrong thermostat, if you have a brown you need a thermostat for a heat pump, a regular thermostat is not going to have a brown connection.

Posted on May 08, 2008

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I have a White Rogers programable thermostat I need to wire but my wires don't match up. The wires from my unit are blue, green, orange, white/blue band, white/green band


When you remove the wires from the old t-stat they should go to the same terminals you pulled them from. If R had an orange wire then the orange goes to R on the new t-stat. If that's not a good method, probably due to the style of old t-stat, then you need a tech. In order to wire it properly you will need to know what color wires are connected to what terminals inside the indoor unit. Normally inside the unit there will be R,G,W,Y,C where red-R, w-white, G-green, Y-to yellow or sometimes blue, and c-blue unless blue is used for the y circuit. We can use any color we want when wiring these units so honestly there's no way to give you a good answer. Work safe!!

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Is this a heat pump? Look in the thermostat. You should have something like the following.
Red wire to R terminal
Green wire to G terminal
Yellow wire to Y terminal
White wire to W or W1
Blue or Orange wire to the O or B terminal
Brown wire to C terminal.

Let me know what you have in the thermostat. The wire colors are not always the same.

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I need a wire diagram of a central heat and air with a heat pump


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O/B (Only needed if system is a heat pump)

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1 Answer

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Typical color codes in Florida are;
white to W1 for heat
yellow to Y for compressor
red to R-RC-RH for power in
brown to W2 and or emergency /auxillary heat
green to G or Fan
orange to reversing valve(o/b)
blue to common.
You can open the control panel on the unit to verify these colors and components.

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I am replacing a white rodgers thermostat with a honeywell rth3100c. i have matched my wire as e (brown) to e w2 (white) o aux y (yellow) to y g (green) to g o (orange) to o l blank r (red) t r b blank c...


Blue (C) or sometimes (B) should be your common wire. Look at your schematics and locate common. Your Brown wire is (E) and is emergency heat, white wire (W) is Auxilary Heat, green wire (G) is fan relay, red wire (R) is power, yellow wire (Y) is Cooling and orange wire (O) is reversing valve.

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your best bet and where i would start is to identify where the coulors are conected at the fernace. in the industry we use standard wireing coulors wher green is g for fan and red is rh=switched trans power for heating . rc=switched transformer power for cooling . now normaly there is only one transormer so you would put a jumper from rc to rh and conect the red wire from the furnace to eather of these.jumper installed. the y is your cooling witch is normaly the yellow wire. o on the stat is for a heat pump if you nead to energize reversing valve in cooling mode . w is first stage heating and this can be conected to eather brown or white youll have to check at the furnace to see witch it is . the final wire eather brown or white should be conected to c or 24v common witch you didnt say you see on the thermostat. once again
red to rc and rh
green to g
yellow to y
brown or white to w
brown or white to common or c


please post feadback hope i was of help

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3 Answers

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