Where to connect C wire - Trane XE900
#1
11-23-17, 06:26 PM
Where to connect C wire - Trane XE900
Hi,
I'm looking to change my current thermostat and I'll need a C wire. I have unused wires coming from the furnace to the thermostat, however I have no clue where to connect the C wire. The compressor is a Trane XE900 and runs heat pump and A/C.
I have 4 wires in use in my current thermostat.
This is the schema
And a picture with, where I think I have to connect the C wire
Could you help me?
Thanks
I'm looking to change my current thermostat and I'll need a C wire. I have unused wires coming from the furnace to the thermostat, however I have no clue where to connect the C wire. The compressor is a Trane XE900 and runs heat pump and A/C.
I have 4 wires in use in my current thermostat.
This is the schema
And a picture with, where I think I have to connect the C wire
Could you help me?
Thanks
#2
11-23-17, 06:43 PM
Bottom picture - go a bit lower and zoom in on the left and post again. The blue wire is most likely the C you need. It should also be connected to a wire going to your outside compressor as the compressor needs a C as well.
#4
11-23-17, 09:32 PM
Yup. That thick blue wire in the front is C. For sanity use the spare unused blue wire to go to the thermostat. Remove the blue wire nut - add the thin blue wire - then put the wirenut back on - will have thick blue, thin blue, and the old white.
Are you sure that you have a heat pump? The thermostat wiring is only set up for a/c and electric coil heat.
Are you sure that you have a heat pump? The thermostat wiring is only set up for a/c and electric coil heat.
#5
11-23-17, 09:32 PM
Group Moderator
It's hard to read the colors in that schematic. The C connection is also grounded in that air handler so any metal chassis connection will yield C.
Agreed.... blue wire. Was able to read Bl off the print.
Agreed.... blue wire. Was able to read Bl off the print.
#7
11-23-17, 09:55 PM
Group Moderator
The XE-900 shows it can be a heat pump. But you'd need to post the actual model number off the condensor unit for confirmation.
If it was a heat pump...... the outside condensor would be running in the winter.
Does that happen ?
If it was a heat pump...... the outside condensor would be running in the winter.
Does that happen ?
