Installation
To calibrate VAV Zone airflow
1
Select the VAV Zone air terminal in the tree.
NOTE
You can select
View
>
Device ID
or
View
>
Primary Use
to show this information next to each item in
the tree.
2
Select the
Test and Balance
tab.
NOTE
If or
appear on the status bar, see Air terminal calibration status to determine what you must
do before calibration can occur.
3
Verify that the air source is off and that airflow has stopped.
4
Click
Zero Calibrate
.
NOTE
The table below describes each damper command. Commands with a are required. Optional
commands improve system accuracy. Do these in order from top to bottom for best results.
5
The status bar shows
Damper Moving
. Wait until it shows
Damper Ready
.
6
If the controller has an external actuator, do the following:
a)
Type the
Measured Flow
in the fields beside
Zero Calibrate
.
b)
Click the
Current Sensor Reading
button to copy the value to the
Sensor Reading
field, or type an
adjusted value in the field.
7
Turn on the air source.
8
For each additional calibration step that you want to perform, do the following:
a)
Click its Damper Command button.
b)
Wait for
Damper Ready
.
c)
Enter the
Measured Flow
and
Sensor Reading
as described in step 6.
9
Click
Apply
to send your changes to the controller and update the
Last Calibration Date
on the air source's
page.
NOTE
If desired, you can click
Apply
after each calibration step.
10
Remove any locks you have applied. See To view, lock, or unlock an air terminal function.
11
Click
Automatic
to return the controller to normal operation.
NOTES
•
For
Cool Max
,
Heat Max
, and
Occupied Min
– When the setpoint is reached and stable, you can select
Lock
damper at current open position
on the
Locks
tab to prevent damper movement while you take flow
readings.
•
You can repeat a calibration step to further calibrate the airflow sensor.
•
An airflow sensor only reports air delivered from the air source. To adjust the cfm (liters/second) of variable
speed fans in parallel VAV reheat, close the primary air damper.
Damper Command
Action
Zero Calibrate
Closes the damper, takes a number of flow samples, then sets the zero calibration.
Damper Open
Opens damper fully and enables the
Damper Open
calibration fields.
Cool Max
Forces the damper to its maximum cooling position. Calibration fields apply only if the
primary use of this damper is cooling.
26
VAV Zone Controllers
