80 VAV Controller—Variable Air Volume Controller
z If you read a value less than 5 VDC/VAC, the circuit is properly
isolated. A value of less than 0.10 VDC/VAC indicates a completely
isolated circuit.
z Connect the DVM across the 24 VAC and the 24 VAC Common
terminal of the VAV. Read the voltage with all typical loads
energized.
A reading of 24 VAC is required when the line voltage is nominal.
If you read a value less than 20 VAC, make sure the primary voltage
matches the transformer’s voltage rating. For details, refer to the
Power Source and Loads section of this technical bulletin and
recalculate the VA requirements for the VAV Controller.
You have completed the VAV isolation tests. If you plan to connect this
VAV to the N2 Bus for communication to other devices, refer to the
Application Specific Controllers Technical Manual (FAN 636.3), the
Introduction tab, the ASC and N2 Bus Networking and Troubleshooting
Guide Technical Bulletin.
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