Trane Symbio 500 - Input;Output Wiring and Checks; Point Check Diagram; Resistive and Voltage Inputs; Current Inputs

BAS-SVX090B-EN
25
Point Check Diagram
This section shows diagrams and describes methods to check device input/output points before the
connection to the Symbio 500 controller has been made and power has been applied. The step
numbers in each illustration correspond to the information in each table.
Note: The Symbio 500 controller should not be connected to the input and output devices during the
pre-power checks, so the controller is not shown in the diagrams.
• Resistive Inputs
Checkout Procedure Measurement
Expected Value
Step 1
Measure AC voltage across the
resistive termination.
Vac ≈ 0.0 V
AC voltage will affect further
measurement.
Step 2
Measure DC voltage across the
resistive termination.
Vdc ≈ 0.0 V
DC voltage will affect further
measurement.
Step 3
Measure the resistance across the
resistive termination.
Compare the measured resistance with
the expected value based on the
manufacturer’s specification and
current conditions.
• Voltage Inputs
Checkout Procedure Measurement
Expected Value
Step 1
Measure AC voltage across the voltage
input.
Vac ≈ 0.0 V
AC voltage will affect further
measurement.
Step 2
Measure DC voltage across the voltage
termination.
Compare the measured voltage with
the expected value based on the
manufacturer’s specification and
current conditions.
• Current Inputs
Wiring