iSMA Configurator

Balancing actions in the iSMA Configurator are available in the last tab of the VAV Configurator, the Balancing tab. Here, it is possible to perform actions of the balancing process.

The available actions are:

• Set K-Factor: sets the K-factor value to the airflow calculations (AV61, 40289);

• Max Flow Calibration: executes a calibration action according to a new maximum airflow value (AV66, 40294);

• Max + Min Calibration: executes a calibration action according to a new maximum and minimum airflow values (AV66, 40294);

• Zeroing: performs the pressure sensor zeroing action (BV13, 00014);

• Mode Override: allows to force the device to operate in one of the available modes (MSV7, 40068):

  • Available settings: Auto, Max. Flow, Min. Flow, User Flow, User Position, Full Open, Full Close, Calibrate;

• Set all In auto: forces all dampers to the Auto mode (MSV7, 40068).

Balancing Steps

To perform the balancing process and regulate the efficiency point of the ventilation system, follow the below steps. These activities are to performed in the presented order. If required, perform the balancing process with zeroing, however, according to the specific user and accuracy requirements, it is possible to omit the pressure sensor zeroing and/or minimum airflow calibration.

Pressure Sensor Zeroing

If required, pressure sensor zeroing is an initial action of the balancing process. According to the specific user and accuracy requirements, this action can be omitted in the balancing process.

Pressure sensor zeroing is a part of the VAV balancing process, which aims at eliminating a constant measurement error of differential pressure on a built-in pressure sensor. The zeroing process involves the following steps:

• Make sure the differential pressure sensor is disconnected from the measuring cross or other measuring method.

• Use a flexible hose of an appropriate diameter to connect the two spigots (+ and -).

• Make sure the hose is well secured and tight to equalize the pressures on both ports.

• Invoke the zeroing action.

• Detach the hose.

• Restore the normal connection of the sensor to the measuring cross or other target circuit, pay attention to the polarity.

Setting K-factor

Setting the K-factor is a mandatory part of the balancing process. It is normally provided by the manufacturer of the VAV box. If for any reason it is unavailable, it is recommended to use a default K-factor from the VAV application (100 l/s /1000 cfm).

Maximum and Minimum Airflow Calibration

To perform the full balancing process, proceed to the maximum and minimum airflow calibration action, under the Max. + Min. Calibration button. The action invokes two pop-up windows, first for the maximum calibration in step 1, and second for the minimum airflow calibration in step 2.

In step 1, measure the airflow and enter the measured value. Then, proceed to calibration (using the Calibrate button). The action will return a newly calculated K-factor.

After completing step 1, continue to step 2, the minimum airflow calibration. Enter the measured airflow value and use the Calibrate button.

Note

Invoking this action prompts an override warning pop-up:

Maximum Airflow Calibration

If, for any reason, the minimum airflow calibration is not required, it is possible to perform only the maximum airflow calibration. Measure the airflow and enter the measured value. Then, proceed to calibration (using the Calibrate button). The action will return a newly calculated K-factor.

Note

Invoking this action prompts an override warning pop-up:

Other Actions

Mode Override

The Mode Override action allows to force an operating mode to a damper. Available modes are:

• Auto: sets auto mode (VAV application logic takes control),

• Max flow: goes to a maximum airflow,

• Min flow: goes to a minimum airflow,

• User flow: goes to a user-set airflow,

• User position: goes to a user-set position (% of damper opening),

• Full open: damper fully open,

• Full close: damper fully closed,

• Calibrate: performs a damper calibration (the damper goes to 100%, than to 0%, and goes back to the control loop output).

Set All in Auto

The Set All in Auto action forces all dampers to the Auto operating mode.