ABB CBV-2U4-3T User Manual page 54

Zeroing Airflow sensor
The CBV-2U4-3T(-N)
leakage around the damper, users are able to zero the airflow sensor in the field. To zero the airflow sensor,
users will need to do the following:
1. Drive damper to the closed position by enabling
2. After damper has fully shut, set
After 10 seconds the
now be zeroed. Be sure to disable
Airflow Calibration Procedure
1.
Airflow sensor calibration sensor using flow selection in the firmware block VAV flow calculation.
1.1 Set Max cfm flow at
1.2 Set to DampMaxMan (D193)
1.3 Set KFactSelect (D204)
1.4 Allow airflow
1.5 Enter balancers airflow reading in CFM in
1.6 Again, allow airflow
1.7 Repeat as necessary.
1.8 Calculated K factor can be read at
1.9 Set DampMaxMan (D193)
2.
Airflow sensor calibration sensor using the K- factor selection in firmware block VAV flow calculation.
2.1 Set KFactSelect (D204)
2.2 Set MeasuredFlow/K (A218)
2.3 Calculated flow can be read at
Note: If KFactSelect (D204)is
to will cause the
FALSE
set back to . It is recommended to save final
FALSE
KFactSelect (D204)
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CBV-2U4-3T(-N) |
comes from the factory with the airflow sensor zeroed. To compensate for possible air
TABPriAirZero
TABPriAirZero (D150) will be automatically set back to off and the airflow sensor will
DampCloseMan
TABPriAirMaxStpt
to .
TRUE
to .
TRUE
PriAirFlowCV (A194) to reach
PriAirFlowCV (A194)
KFactorOut (A215)
to when complete.
FALSE
to .
FALSE
to the K-factor specified by the unit manufacturer.
PriAirFlowCV (A194)
and balancing is finished, toggling
TRUE
MeasuredFlow/K (A218)
to after balancing. This will ensure the
FALSE
Control Sequence Overview
DampCloseMan (D192).
(D150) to on.
(D192) when finished with this step.
(A211).
TABPriAirMaxStpt (A211)
MeasuredFlow/K (A218).
to reach TABPriAirMaxStpt (A211)
DampMaxMan (D193)
to change to the new K Factor, and
K Factor number to
K Factor is not lost on a firmware upgrade.
or DampMinMan (D194)
KFactSelect (D204)
MeasuredFlow/K (A218) and set
will be
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