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TROUBLESHOOTING TIPS
Stable Airflow
When the VAV II controller is being balanced, the
configuration or balancing tool may indicate stable
airflow and allow balancing before the controller has
actually reached the balancing control setpoint. During
this period, if any measurements are made of the
actual airflow volume and entered while the controller
is still ramping to the airflow setpoint, erroneous
balancing results may be recorded.
IMPORTANT
• Excel 10 VAV II Controllers must have an air
flow pickup table downloaded to ensure
accurate balancing. Configuration tools do
not automatically install the flow pickup table
defined for the controller.
• If VAV II Controllers are not balancing, check
with the Honeywell Authorized technician or
Honeywell contractor that the flow pickup
table download to each controller has
occurred.
Testing Airflow Measurement
Anytime the controller’s airflow measurement process
is to be tested or troubleshooting is attempted, the
airflow must be constant. The VAV II controller should
be fixed at some desired or stable setpoint that is not
changed during troubleshooting or testing.
