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Twinned Trane XE80 issues

3K views 7 replies 2 participants last post by  beenthere 
#1 ·
I have two trane XE80s that are twinned. The secondary one stopped working. Looking at the flashing lights shows that there is no call for heat on the second one. I swapped the control boards so I know that the basic functions work. How can I test to see if the correct voltages are being supplied/applied for the twinning circuits?
 
#4 ·
How is the heat controled, if there is no wire hooked to the R???

Without a wire of some kind hooked to teh red, it won't have a heat call.

The twin terminal is to sycronize the blower speeds.
 
#6 ·
If they are on the same breaker in the box, its not needed.
If they aren't its needed.

Sometimes, a system needs the isolation relay. But the installer doesn't use one. And they work for years. And then just stop working.

You need amultimeter/voltmeter, to see what, if any voltage is at the W terminal, of the working and non working unit.

May be that the thermostat can't handle the load, anymore.
 
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