Trane BCI-I Integration Manual page 16

24 Vac Measurement
General Information
Checking the voltage that is
powering the UC400 is often a
necessary step when commissioning
or troubleshooting. Operational
issues and LED operation may result
in a need to measure the input
power.
When troubleshooting, it is faster to
take measurements while the load is
in place. If Step 1 indicates an out-
of-specification voltage, disconnect
the UC400 and measure the AC
voltage across the transformer.
These measurements can direct the
technician towards the problem
source.
ACC-SVP01B-EN • BCI-I Integration Guide
Checkout Procedure Measurement
Measure AC voltage with the
UC400 connected. Perform this
Step 1
measurement while the unit is
under load.
Measure AC voltage with the
UC400 unconnected. Perform this
Step 2
measurement while the unit is not
under load.
BCI IntelliPak Rotary Switches and LEDs
Expected Value
20.0 Vac ≤ V
20.0 Vac ≤ V
≤ 30.0 Vac
ac
≤ 30.0 Vac
ac
15