Honeywell T8411R to RTH7400 Thermostat Change


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Old 06-23-15, 07:07 PM
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Honeywell T8411R to RTH7400 Thermostat Change

Hi,
I'm trying to change a Honeywell T8411R to a RTH7400 thermostat on a York 1.5 ton heat pump. The wiring is pretty straightforward, except for one wire that I'm not sure about. The T8411R is wired as follows:
G- Green
C- Blue
R- Red
W1- Jumped to Y
Y- Yellow
L- Black
W2- Jumped to E
E- White
B- Empty
O- Orange

Here's what I'm thinking on the RTH7400:
G- Green
C- Blue
R- Red
Rc- Jumped to R
Y- Yellow
L- Black
AUX (also labeled W2)- Jumped to E
E (also labeled Y2)- White
O/B (also labeled W)- Orange

What's confusing me is the fact that the Y is jumped to W1 on the 8411R. On the 7400, the wires have multiple labels as noted above, and where I think the orange should go is labeled O/B on one side and W on the other. It seems like I need to have the orange here, or is this actually the W that should be jumped from Y as it is on the 8411R? And is so, where would the orange go? Any advice is appreciated.
 
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Old 06-23-15, 07:17 PM
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Connect orange to the O/B terminal.

The new thermostat does not require the jumper between Y and W(1).

The new thermostat will energize the compressor with a heating or cooling demand (like your old one) when you configure it for heat pump operation.

Set function 170 to 7 and set 190 to 0.
 
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Old 06-24-15, 04:18 AM
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Thank You for the help!!!
 
 

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