VAV-SVX01C-EN 55
Air and Water Balancing
make the required adjustments to pulley sizes, motor sizes and electrical connections to
accommodate fan speed changes. If any adjustment have been made, repeat step 2.
• If after adjusting the fan to its maximum capacity there is still a shortage of airflow, shut off part
of the system to provide enough airflow to balance the other part of the system. This can be
done using Rover or the "Override to Unoccupied" command ("**") at the zone sensor.
3. After determining that there is enough CFM for all zones, drive all the VAV boxes to MIN.
Note: If the VAV boxes have already been assigned to groups and these groups are separate
thermal zones, then the balancing can be done on a group basis.
VAV Single Duct Unit Air Balancing
Select a group to balance and give the VAV units a recalibrate command and then the group a flow
override Drive MAX command.
Note: If the VAV boxes have not been placed in a group, each individual UCM can be overridden
to Drive MAX in the Override menu in Rover. However, this will be more time consuming.
If reported flow in Rover is different from the measured CFM (flow hood measurement) a cooling
flow correction can be calculated by Rover by entering the measured flow in the measured value
field. See above, Figure 31, p. 55.
Figure 31. Measured value field
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