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I am trying to replace a old mercury thermostat with a honeywell model rth3100c My old thermastat has a white wire going to W2, yellow to Y, green to G, red to R, orange to O, nothing to C or E. This is for a Heat Pump The new thermostat has terminals E, Aux,Y,G,O,L,R,B,and C Can anyone help? Thanks Bill
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E Back up heat/ white wire
AUX Jumper to E
Y yellow wire / Cooling - compressor
G Indoor fan Green wire
O Reversing valve energised in cooling most units Orange wire
L unknown. consult your manual Leave open
R Main power Red wire
B Reversing valve energised in Heat Rheem units only.
C Common second leg of power Blue wire.
well the wire on x will go to e thr r is the red wire goes to r the wire on f willgo to g the y will go to y now the rest you'll have to verfy at air handler o will go to reversing valve common wire will go to c the electric heat will go to aux
Hello,You forgot to wire the O terminal w1 witch is the reversing valve.It is important to check if old stat is using O or B in witch case B terminal=w1 leaving O unused.
Your original wiring configuration seems to indicate that you have an air conditioner (not heat pump) and either a gas or electric furnace. If this is the case you may need a different thermostat for your application.
Just remember what wires went to which terminal. Usually color coded, red =R, white = W, etc, Shouldn't be too hard. Let me know if you run into a problem.
HONEYWELL WEBSITE:
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
both thermostatats will have terminal designators R,W,Y,G, possibly O/B, C, W1,W2, Y1, Y2, etc.
Simplest method is to remove wires from old stat one at a time. mark where they came from and then install at same desinated terminal on the new t-stat. Hope this helps. be sure to shut off power supply to the unit (furnace) first. The wire coming to the R (RH,RC) terminal is the 24 volt a/c hot, all others are feeding back to perform given function.
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