T8411R to RTH7400 - http://www.hvacmechanic.com/ Forums
Original message
| robertjtucker
 |  "T8411R to RTH7400"
, posted Sun 13 Apr 10:31  
I am having an issue converting to this new programable, everything seems to be coming on except the heat pump.
The T8411R has the following connections
G-Wire L-No Wire
C-Wire W2-Wire
R-Wire E-Wire
W1-Jumper to Y B-No Wire
Y-Wire O-Wire
The RTH7400 has the following that I connected to labeled as conventional first then heat pump
C-C-Wire
G-G-Wire
Y-Y-Wire
O/B-W-Wire with O from above
RC-RC-Jumper to R
R-R-Wire
W2-Aux-Wire
Y2-E-Wire with E from above
L-No wire
I don't know enough about it but I was thinking that my issue was with the W1 and Y jumper from above and what I did was use the O wire on the new installation. Or is it that I missed a system setup setting?
I appreciate any help
Thanks, Bob
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Replies:
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| Houston204
| "Re(1):T8411R to RTH7400" , posted Sun 13 Apr 10:55:
It would have been easier to help you had you written G = Green instead of G - Wire. The color used for E and C can vary. My diagram uses common color codes, yours may differ.
Old = New
G = G
C = C
W2 = Aux
R = Rc & R
E = E
W1 = not used
Y = Y
O = O/B
option 170 = 7
option 190 = 0
"Tip of the Day" Remember to remove power first.
[this message was edited by Houston204 on Sun 13 Apr 10:58] |
| | robertjtucker
| "Re(2):T8411R to RTH7400" , posted Sun 13 Apr 11:07
Sorry I hope this is better and thanks for the help
G-Green Wire L-No Wire
C-Black Wire W2-White Wire
R-Red Wire E-Brown Wire
W1-Jumper to Y B-No Wire
Y-Yellow Wire O-Orange Wire
The RTH7400 has the following that I connected to labeled as conventional first then heat pump
C-C-Black Wire
G-G-Green Wire
Y-Y-Yellow Wire
O/B-W-Orange Wire with (O) from above
RC-RC-Jumper to R
R-R-Red Wire
W2-Aux-White Wire
Y2-E-Brown Wire with E from above
L-No wire
Thanks again for any help
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| | Houston204
| "Re(3):T8411R to RTH7400" , posted Sun 13 Apr 11:34:
Refer to outer terminal labels.
C = black
G = green
Y = yellow
O/B = orange
Rc & R = red
Aux = white
E = brown
It appears to be wired correctly. Set option 170 to 7 and 190 to 0 since this is a heatpump using O for the reversing valve.
If your outdoor units fails to start you may have short cycled it causing it to lockout on thermal protection. (Did you remove power before replacing your stat?)
You might check the breaker for your outdoor unit. If the compressor is hot it will cool down in a few hours. This cooling time can be reduced to 10 minutes by removing power, and running a garden hose over the compressor.
Does the indoor fan turn off when you set it to at your thermostat? If you didn't remove power to the air handler before replacing your stat, you may have popped a low voltage fuse.
"Tip of the Day" Remember to remove power first.
[this message was edited by Houston204 on Sun 13 Apr 11:44] |
| | robertjtucker
| "Re(4):T8411R to RTH7400" , posted Sun 13 Apr 11:45
I changed 170 to 7 and put 190 to 0. I turned the breakers off to all my units before starting at the breaker box. The fan is on now it was coming on before the pump outside hasn't come on yet.
Just to be sure I have
2 units outside
1 unit in the crawl space
1 unit in the attic
The upstairs and down stairs are wired separately.
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| | robertjtucker
| "Re(5):T8411R to RTH7400" , posted Sun 13 Apr 13:29
Just for kicks and giggles I hooked up the original thermostat to be sure everything was still working properly and it does. SO I guess I am back to square one with my setup or wiring.
Thanks for any help,
Bob
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| | Houston204
| "Re(6):T8411R to RTH7400" , posted Sun 13 Apr 14:37
Have you tried reinstalling the new stat? We had a poster have better luck on the second attempt recently.
"Tip of the Day" Remember to remove power first.
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| | robertjtucker
| "Re(7):T8411R to RTH7400" , posted Sun 13 Apr 16:34
I am not sure what the difference is because I didn't do anything different but all seems to be working well thank you for your help,
Bob
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