Help installing new thermostat
#1
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Help installing new thermostat
I got a new Honeywell thermostat RTH8500D and having some issues connecting it up. I have a Gas Furnace as well and need help with wiring new thermostat, thanks for any assistance,
Image of original Wiring from Emerson Thermostat
The issue I'm having is the O/B or Black wire, there is no where to put that wire on the new thermostat which has the wiring diagram here:
Also here is a picture of the block on my furnace if that would help
Image of original Wiring from Emerson Thermostat
The issue I'm having is the O/B or Black wire, there is no where to put that wire on the new thermostat which has the wiring diagram here:
Also here is a picture of the block on my furnace if that would help
#3
Welcome to the forums.
I think we need confirmation of wiring at furnace too.
No idea what black is doing there.
Can you confirm these colors on listed screw terminals ?
C = blue
G = green and white
R= black and red
W= white
Y = yellow
In looking further.... I see the black on R and the white on G coming in on a two wire thermostat cable. That means the black wire at the thermostat is not connected at the furnace.
I think we need confirmation of wiring at furnace too.
No idea what black is doing there.
Can you confirm these colors on listed screw terminals ?
C = blue
G = green and white
R= black and red
W= white
Y = yellow
In looking further.... I see the black on R and the white on G coming in on a two wire thermostat cable. That means the black wire at the thermostat is not connected at the furnace.
#4
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I ended up omitting the black O/B Wiring and everything seems to work perfectly, I think it may be used for a Air Conditioning but being in Canada I don't have A/C. Thx for the help