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View Full Version : How to upgrade honeywell thermostats, T841A to T8411R


gregriggsinc
Nov 16, 2008, 08:27 AM
I have a honeywell T841A thermostat wired as follows:
G - GREEN WIRE
R - RED WIRE
E - JUMPERED TO W2 TERMINAL
X - BROWN WIRE
W2 - WHITE WIRE
B - BLUE WIRE
W1 - JUMPERED TO Y1 TERMINAL
Y1 - YELLOW WIRE
O - NOT USED
L - NOT USED

How do I connect these wires to the Honeywell T8411R?

I came up with this:

R - RED WIRE
W2 - WHITE WIRE
L - NOT USED
B - BLUE WIRE
O - NOT USED
W1 - JUMPERED TO Y TERMINAL
Y - YELLOW WIRE
E - JUMPERED TO W2 TERMINAL
G - GREEN WIRE
C - BROWN WIRE

Will this work?
Thanks

This is connected to a Rheem Heat Pump.

hvac1000
Nov 16, 2008, 03:55 PM
8411R diagram

http://customer.honeywell.com/techlit/pdf/PackedLit/69-1486.pdf

841A diagram

http://customer.honeywell.com/techlit/pdf/69-0000s/69-0452.pdf

gregriggsinc
Nov 16, 2008, 04:04 PM
Thanks Hvac1000,
I have the diagrams but not sure I interpreted them correctly, do you think my proposed wiring will work?
Thanks

hvac1000
Nov 16, 2008, 06:02 PM
Thanks Hvac1000,
I have the diagrams but not sure i interpreted them correctly, do you think my proposed wiring will work?
thanks

I believe it should work but look over this chart of old to new HP wiring codes for yourself.

gregriggsinc
Nov 17, 2008, 05:09 AM
Thanks Again! This will get me on track.

dac122
Nov 17, 2008, 06:19 AM
I think you are good. If you're a little unsure just wire a little and test a little. First just power, then fan, then aux heat, then the rest.

hvac1000
Nov 17, 2008, 03:11 PM
Hopefully that chart will help. Make sure to post back and let us know how it all came out.