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Jerk151 · Apr 19, 2009, 11:26 AM

I have searched and searched and find lots of thing for both of these units, but there is always one thing different. So I will try to explain what I have learned and what I am still confused about.

The Honeywell T8411R was given to me, has no instructions and the person that gave it to me said at one time there was a jumper between what he thought was W2 & E. It is no longer there and I don't know if I need it.

I will spare you how the wires were connected to the Trane as it doesn't really matter now, I just need to know where to put them on the new one.

My existing bundled wires are as follows:

7 wires,

White (I understand this may go to a heat strip)
Blue
Red - Possibly 24 volt
Green - possibly the fan
Yellow - possibly the compressor
Orange - reversing valve (I have no idea what that means)
Tan - (which I believe is for an outdoor thermostat and will no be in use on the new one.

*No Black wire* one of the problems I keep finding along with the fact that this new Honeywell does NOT have the AUX spot.

This is what it does have:

G, C, R, W1, Y, L, W2, E, B, O

I feel pretty certain from what I have read that

Wires = Terminal
Red = R
Green = G
Yellow = Y
Orange = O

I would assume White = W1 but O don't get display like that.

I have tried Blue = C and Blue = B while White = C, I got Display with both combinations but other malfunctions.

PS. Air conditioner is a Trane Weathertron heat pump, XE 900

Thank You,
Jody

Jerk151 · Apr 19, 2009, 11:37 AM

Update is that the jumper I mentioned could have been between Y and W1

Jerk151 · Apr 19, 2009, 01:45 PM

Bigger new problem!

I found a different thread that explained the wiring based of replacing a Honeywell T8411R.

Nothing is working at all. I wired it with the new instructions and nothing happened at all. I had wired it a couple of other ways prior to this based on some forums other than this one. In doing so, I assumed that I had shorted out this new thermostat and all was just going to have to go back to the old one and live with it. I hooked up the old one and it does not work anymore. What did I short out. The fan doesn't come on, no clicks, no nothing except a small hum from a transformer on the air handler. I've turned off the main breaker because I didn't know any other way to make the hum stop.

Any ideas?

Joshdta · Apr 19, 2009, 02:02 PM

OK, you still here?

Joshdta · Apr 19, 2009, 02:03 PM

Does your air handler have a control board in it where the tranformer is?

Jerk151 · Apr 19, 2009, 02:17 PM

Originally Posted by Joshdta

does your air handler have a control board in it where the tranformer is?

Thank You, Yes it does, I just opened it up and found a re wire that is connected through a 300v Buss fuse just hanging there with tape on it. O don't know if it is supposed to be connected or taped off

Joshdta · Apr 19, 2009, 02:18 PM

R- red- power
Y- yellow- ac
G- green- fan
O- orange- reversing valve
w1- white also jumped to e - aux or electric heat
C- blue- common wire
w2-brown- extra heat relay
XorL- black led light for t-stat

Jerk151 · Apr 19, 2009, 02:26 PM

I'm getting nothing, something else beyond the thermostat has a problem now

Joshdta · Apr 19, 2009, 02:31 PM

On your control board look and see if there is a small 5 amp car type fuse. You may have blown that.

Jerk151 · Apr 19, 2009, 02:56 PM

Originally Posted by Joshdta

on your control board look and see if there is a small 5 amp car type fuse. you may have blown that.

The only fuse present seems to have been disconnected at one time or another. I took the front panel off the box that the control board is on and my meter tells me I have power going to the mirco-switchs inside, but nothing seems to be transferred from there

Joshdta · Apr 19, 2009, 04:31 PM

If that contral board does not have the little car fuse. Then up may have burt up the board. Do you have power at the transformer?