Trane Tracer UC210 Installation, Operation, And Programming page 66

Troubleshooting
Equipment Damage!
The UC210 controller outputs are switched to ground. Do not jumper 24 Vac to binary output
TRIAC(s) because damage will occur.
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– Check for correct binary outputs. It should have 24 Vac. If it does not, measure the power
input to XFMR 24 Vac input and
between 20.4 to 27.6 Vac (24 Vac cataloged). However, voltages at either extreme may result
in system instability.
Heat TRIAC(s) can be checked by purchasing a 24 Vac LED and connecting to the TRIAC output.
If they are lit, it is calling heat output to be OPEN or CLOSED by the UC210 controller. If LED is
not lit, replace the UC210 controller.
of the UC210 controller. The supply voltage should be
NOTICE:
BAS-SVX62E-EN