Trane Symbio 500 Installation, Operation And Maintenance Manual page 24

Wiring
Basic Checks
For devices with input/output types listed below, verify their basic functionality:
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24
Binary inputs: check that they are opening and closing. Also check for 24 Vac if they provide their
own power. With a Trane-provided 24 Vac, check to make sure it is dry contact and working.
Thermistors: check for 10K using a digital multimeter (DMM).
Thumb wheels: verify mechanical operation.
Binary outputs: check for any dead shorts.
Analog outputs: check that no A/C voltage is present and that the load has no 24 Vac across it or
120 Vac.
BAS-SVX090B-EN