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2,427 Posts
obviously you have a heat pump. what model is your old thermostat?
Programmable Thermostat Install Q
I purchased the 3M Filtrete (3M-22) programmable thermostat and I'm confused on how to install it. Im pretty sure im just over thinking it.
OLD THERMO WIRES:
W | B | G | R | X | O | Y
NEW THERMO WIRE OPTIONS:
C | B | O | W | W2 | Y | Y2 | RH | RC | G | A
This is how I believe I should install:
W - W
B - C (It says that If I have both B and O, I should install B to C and O to O)
G - G
R - RH
X - ???
O - O
Y - Y
Where should the X go?
Thanks!
OLD THERMO WIRES:
W | B | G | R | X | O | Y
NEW THERMO WIRE OPTIONS:
C | B | O | W | W2 | Y | Y2 | RH | RC | G | A
This is how I believe I should install:
W - W
B - C (It says that If I have both B and O, I should install B to C and O to O)
G - G
R - RH
X - ???
O - O
Y - Y
Where should the X go?
Thanks!
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(R), Red conductor, hot side of transformer
(C) or (B) or (X), Blue, Black or Brown conductor, Common side of transformer. Not to be confused with (B) on heat pumps. If you have a (B) on a heat pump thermostat, your common will be (C) or (X)
(Y), Yellow conductor, 1st stage compressor contactor (cooling for ac or cooling and heating on a heat pump).
(Y2), Blue or Pink, second stage compressor contactor
(W), White conductor, 1st stage heat (gas furnace, oil furnace, electric resistance furnace (auxillary heat on a heat pump)
(W2), Pink or any unused color conductor, second stage of heat
(G), Green conductor, furnace blower fan.
(O), Orange conductor, Energize heat pump reversing valve to cool
(B), Blue or Orange, Energize heat pump reversing valve to heat (mainly older Rheem/Ruud).
(E), blue, pink, gray or tan conductor, emergency heating strips on a heat pump.
(T), Tan or Gray conductor, outdoor temperature compensator.
(L), Blue, brown, tan or gray conductor, service indicator lamp.
(C) or (B) or (X), Blue, Black or Brown conductor, Common side of transformer. Not to be confused with (B) on heat pumps. If you have a (B) on a heat pump thermostat, your common will be (C) or (X)
(Y), Yellow conductor, 1st stage compressor contactor (cooling for ac or cooling and heating on a heat pump).
(Y2), Blue or Pink, second stage compressor contactor
(W), White conductor, 1st stage heat (gas furnace, oil furnace, electric resistance furnace (auxillary heat on a heat pump)
(W2), Pink or any unused color conductor, second stage of heat
(G), Green conductor, furnace blower fan.
(O), Orange conductor, Energize heat pump reversing valve to cool
(B), Blue or Orange, Energize heat pump reversing valve to heat (mainly older Rheem/Ruud).
(E), blue, pink, gray or tan conductor, emergency heating strips on a heat pump.
(T), Tan or Gray conductor, outdoor temperature compensator.
(L), Blue, brown, tan or gray conductor, service indicator lamp.
Joined
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2,427 Posts
some old systems used both O and B. what kind of heat pump and furnace or air handler do you have? How old are they? Can you access the terminal strips in the equipment? This is the only true way to know what goes where and if your new stat will even work with your system. Does your old stat have a emergency heat function?
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