Test And Balance; Setting Initial Box Size; Zeroing Airflow Sensor; Airflow Calibration Procedure - ABB FBVi-2U4-4T User Manual

TEST AND BALANCE

You can balance the box using
CXpro
ᴴᴰ).
A point has been setup to allow test and balance commands to be sent to individual boxes, or groups of
boxes, to set the primary air damper to max Flowrate,
These commands may be used to calibrate the airflow sensor and balance the boxes. Before balancing
the box, the unit should be in occupied mode, and the

SETTING INITIAL BOX SIZE

Before balancing is available, an initial box size can be set to generate a starting K-factor. After balancing,
this initial K-factor will be replaced with the balanced K-factor.
Set box size with the
•
1 = 4" Box
•
2 = 5" Box
•
3 = 6" Box
•
4 = 8" Box
•
5 = 10" Box
•
6 = 12" Box
•
7 = 14" Box
•
8 = 16" Box

ZEROING AIRFLOW SENSOR

The FBVI-2U4-4T comes from the factory with the airflow sensor zeroed. To compensate for possible air
leakage around the damper, users can 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 setting
2.
After the damper has fully shut,
After 10 seconds zeroAirflow (D227)
be zeroed. Be sure to set
offset calculation can be read at

AIRFLOW CALIBRATION PROCEDURE

K-factor settings can be manually entered:
1.
For Single Point or the High K-factor, set
in the KFactorFlowHI (A214)
2.
For the Low K-factor, set
KFactorFlowLO (A245)
3.
The K-Factor that is used for flow will be displayed at
4.
The current flow will be displayed at
5.
To reset the K-factor back to the initial box size K-factor, enter 0 when manually entering both
low and high K-factors.
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MAN0144 Aero
Aeroᴮᵀ
(see
boxSize (A144) analog setpoint:
set
zeroAirflow (D227)
will be automatically set back to off and the airflow sensor will now
flowOverride (A258) to 0 (Auto) when finished with this step. The airflow
airflowOffset (A3).
analog setpoint.
balanceModeLo (D45)
analog setpoint.
activeAirflow (A250)
FBVi-2U4-4T |
VAV Phone App
ᴮᵀ
deadband Flowrate, fully open, fully closed, etc.
HVACmodeCmd (A287)
flowOverride (A258)
to ON. After 10 sec. it will record the offset.
balanceModeHi (D204) to
to and enter the K-factor in the
FALSE
activeKfactor (A293)
Control Sequence
MAN0133
), or CXproᴴᴰ
(see
should be in Auto.
to 6 (fullClosed).
and enter the K-factor
FALSE
87