74 CNT-SVX17G-EN
Sequence of Operations
Communicating Air Balance Function
The controller supports a comprehensive two-point air balance function only over
communications. An optional feature in the Rover service tool is used to do two-point air
balancing, which gives greater accuracy in box calibration for the controller. This
function uses the configured airflow measurement gain and the configured airflow
measurement offset to correct for slope and offset errors. Two-point balancing is
recommended over single-point balancing, but is not required.
The two-point air balance function adjusts
the output of the controller flow
measurements to match independent measurements taken by a flow hood. The
independent measurements are taken at two points, minimum flow and maximum flow,
using the controller flow override commands. The goal is to make the controller flow
measurement match the independent flow measurement as closely as possible. It does
not matter if the flow measurements are done in cubic feet per minute (CFM) or liters per
second. The configured airflow measurement gain and the configured airflow
measurement offset are referenced to the configured nominal airflow.
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