Commissioning Instructions

Workflows

Balancing

50 | 76

Siemens

A6V10429119_en--_a_07

Building Technologies

2018-12-19

6. Set Supply Air VAV Balancing Mode to the desired air flow setting.

Note

Calibration is not required at this time.

 The selected mode displays, but the air flow setpoint does not change yet.

7. Select Supply air VAV balancing state, set the mode to Balancing, and click OK.

 The automation station sets air flow setpoint to corresponding Balancing value, sets the state to

Balancing, copies the value of flow coefficient to Initial Flow Coefficient, and resets the mode to Ready.

Note

To abort balancing, command the balancing state to Initial (value = 1).

8. Observe values while waiting for flow control to stabilize over an appropriate length of time.

Supply air VAV setpoint for air volume flow

Supply air VAV air volume flow

Supply air VAV position (damper)

 The automation station moves damper to drive air flow to its setpoint and the tool displays changing

values.

Note

To abort balancing, command the balancing state to Initial (value = 1).

9. Measure air flow(s) with the balancing hood and enter the total value at Supply air VAV air volume flow at

hood.

 The automation station calculates new flow coefficient and continuously displays the updating object

values.

Note

To abort balancing, command the balancing state to Initial (value = 1).

10. Apply the calculated flow coefficient value by setting Supply air VAV balancing command to Calibrate.

 The automation station sets Supply air VAV flow coefficient to the calculated value (Supply air VAV

calc.flow coefficient). At this point the balancing process can no longer be aborted.

 The new Supply air VAV air volume flow reflects the new flow coefficient.

 The automation station sets the calculated flow coefficient back to zero and writes the full set of objects

for the balance report immediately after the new flow coefficient takes effect.

 Supply air VAV balancing command resets to Ready.

Note

To go back to the old flow coefficient, enter the value that is in the flow coefficient initial object into the

flow coefficient object.

11. Set the Supply air VAV balancing command to Balanced.

 The hood volume flow and the balancing mode retain the values entered by the balancer. The automation

station sets Supply air VAV balancing state to Balanced and the flow setpoint returns to normal control.

Stored report values are not affected.

Balancing is complete.