Rewire Trane XV80 for 2 stage heating


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Old 02-10-13, 01:10 PM
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Rewire Trane XV80 for 2 stage heating

I currently have a -
Trane XV80, Aprilaire humidifier, and a Nest Thermostat.

My old wiring to the thermostat was for a single stage heater

I would like to change my wiring so the Nest controls the second stage heating and the humidifier.

I believe I know all the wiring I need to do (thanks to this site)- please correct me if it looks wrong -
- remove the jumper W1 to W2 at the furnace
- run a W2 from the furnace to the Nest
- change the wiring to the humidifier solenoid
- both wires from the solenoid going to the new 6AZU2 relay
- plus C from the furnace to the relay, and * from the Nest to the relay
- run a C from the furnace to the Nest

My question is do I need to change any of the dip switches in the furnace when I do this?
Also I have not bought the relay yet - will it be clear where to connect the four wires?

Thanks for the help.
 
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Old 02-10-13, 01:50 PM
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My question is do I need to change any of the dip switches in the furnace when I do this?
No.





Also I have not bought the relay yet - will it be clear where to connect the four wires?
Stat = terminal 1
furnace common = terminal 3
humidifier = 2 and 4.
 
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Old 02-10-13, 02:21 PM
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Awesome. Thanks the quick reply
 
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Old 02-10-13, 02:33 PM
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I like the picture that Hvactech drew describing your setup.

I have had bad luck with those small black peanut relays though.
I'm a big fan of the standard double pole double throw 24 volt coil relay.
 
 

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