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New Member
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Feb 18, 2007, 09:30 PM
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Replacing Weathertron thermostat with Honeywell
I am attempting to replace our Weathertron thermostat with a Honeywell RTH3100C. We have a Trane heatpump system. I am having trouble with the wiring. My wires don't match the 'less common wire designations' in the manual.
I have the following wires on the Weathertron:
R-red
T-brown
O-orange
G-green
Y-yellow
X2-black
B-blue
W-white
F-Pink
and a grey wire I don't think was connected to anything-it is not taped off, and we don't remember disconnecting it, it just suddenly appeared after we took off the wire plate.
Here is what I have based on the Honeywell installation guide:
E=Weathertron X2
Aux=Weathertron W
Y=Weathertron Y
G=Weathertron G or F (not sure which one to do)
O=Weathertron O
L=Weathertron F
R=Weathertron R
B=Weathertron B (not sure which one to do)
C=Weathertron B
I'm not sure where the T wire should go or what to do with the grey wire.
Thanks for the help.
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New Member
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Oct 11, 2007, 07:17 PM
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I am replacing a Weathertron with a Honeywell RTH230B and need to know the appropriate wiring configuration?
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New Member
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Jul 16, 2008, 01:04 PM
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Do you have schematic for the Honeywell RTH3100C?
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Heating & Air Conditioning Expert
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Jul 16, 2008, 05:24 PM
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Originally Posted by freemom06
I am attempting to replace our Weathertron thermostat with a Honeywell RTH3100C. We have a Trane heatpump system. I am having trouble with the wiring. My wires don't match the 'less common wire designations' in the manual.
I have the following wires on the Weathertron:
R-red
T-brown
O-orange
G-green
Y-yellow
X2-black
B-blue
W-white
F-Pink
and a grey wire I don't think was connected to anything-it is not taped off, and we don't remember disconnecting it, it just suddenly appeared after we took off the wire plate.
Here is what I have based on the Honeywell installation guide:
E=Weathertron X2
Aux=Weathertron W
Y=Weathertron Y
G=Weathertron G or F (not sure which one to do)
O=Weathertron O
L=Weathertron F
R=Weathertron R
B=Weathertron B (not sure which one to do)
C=Weathertron B
I'm not sure where the T wire should go or what to do with the grey wire.
Thanks for the help.
Here you go on Weathertron/same as Trane
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Heating & Air Conditioning Expert
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Jul 16, 2008, 05:26 PM
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New Member
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Feb 2, 2009, 05:30 PM
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I have an old Weathertron thermostat. I just purchased a Honeywell RTH 230B programmable thermostat to replace it. Honeywell have 5 wires RH, RC, W, Y, G. But my old unit utilized 8 wires. G-green, Y-yellow, X2-black, B-blue, U_W-white, O-orange, R-red, T-brown.
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New Member
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Aug 8, 2012, 10:59 AM
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I have a old trane mercury thermostat BAYSTAT239A trying to replace it with a honeywell thermostat RTH11B need help with wiring ?
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