Honeywell CVL4022ASVAV1 Engineering Manual page 35

The tool commands the controller to the manual flow override
mode and sets the flow setpoint as the configured maximum
flow setpoint. The tool then continuously checks/monitors the
controller to see whether the box flow reaches the setpoint.
After the setpoint is attained, the Measured Flow field is
enabled and the actual measured flow value can be specified.
Note that the device remains in manual flow override mode
(Open Maximum) after maximum balancing is complete.
To start minimum calibration, click 'Start Minimum Balancing'.
The tool commands the controller to the manual flow override
mode and sets the flow setpoint as the configured minimum
flow setpoint. The tool then continuously checks/monitors the
controller to see whether the box flow reaches the setpoint.
After the set point is attained, the Measured Flow field is
enabled and you can specify the actual measured flow value.
Note that the device remains in manual flow override mode
(Open Minimum) after minimum balancing is complete.
To start K factor calibration method, click 'Start K Factor
Balancing'.
(Note that when K-factor balancing is started, the two point
calibration data is returned to factory defaults automatically by
the tool before proceeding with the K-factor procedure.)
The tool commands the controller to manual flow override
mode to try and attain the maximum flow setpoint. The tool
then continuously checks/monitors the controller to see
whether the box flow reaches the setpoint After the setpoint is
attained, the Measured Flow field is enabled and the actual
measured flow value can be specified.
Based on actual the measured flow that is entered, the K
factor value is calculated by the tool and displayed. The tool
prompts you to write this value to the device. You can choose
to calculate the K factor without using the tool and set the
calculated value in the K factor field. Note that the device
remains in manual mode (Open Maximum) after K factor
balancing has been completed.
Heating coil water flow calibration
When modulating reheat or modulating peripheral heat is
configured, the Niagara tool allows you to override hot water
valve positions.
To override the reheat valve position, type the reheat value in
percentage and click the Override button next to Reheat Valve
Override field.
To override the peripheral heat valve position, type the
peripheral heat value in percentage and click the Override
button next to the Peripheral Heat Valve Override field.
NOTE: Click the Auto button to set the reheat and
peripheral heat valve into automatic operation.
Balancing via Zio
Pressure Zero Calibration:
1. Change the Wall Module to the contractor view
2. Navigate to Parameters, OVERRIDE, FLO_OVRD.
3. Close the Primary Air damper: FLO_OVRD = CLOS
4. Navigate to Parameters, STATUS, DAMPER
5. Wait for the damper to close: DAMPER = 0
6. Navigate to Parameters, SENSORS, PRS_UCAL
7. Monitor the flow pressure signal for stability: PRS_U-
CAL
8. Navigate to Parameters, SNSR_CAL, PRESS_OF
9. Set the new zero offset: PRESS_OF = PRS_UCAL
10. Navigate to Parameters, SENSORS, FLOPRESS
11. Wait 10 sec and verify the new calibrated pressure:
FLOPRESS ˜ 0
12. Navigate to Parameters, OVERRIDE, FLO_OVRD.
13. Return to normal operation, FLO_OVRD = ----
Zio - K Factor One Point Balance:
1. Change the Wall Module to the contractor view
2. Navigate to PARAMETERS, FLO_CNFG, AREASQFT
3. Verify that the correct duct Area is configured.
4. Obtain the factory zone terminal K factor from the man-
ufacturer data sheet. If the K factor is unknown, use the
value 1400.
5. Navigate to PARAMETERS, FLO_CNFG, K FACTOR
6. Set the factory K factor.
7. Navigate to PARAMETERS, AIRFLOSP, MAX_FLO
8. Verify the value of MAX_FLO setpoint.
9. Navigate to PARAMETERS, BALANCE, K_OFFSET
10. Verify that K_OFFSET = 0.
11. Navigate to PARAMETERS, OVERRIDE, FLO_OVRD.
12. Set VAV box override to the maximum occupied airflow
setpoint: FLO_OVRD = HISP
13. Navigate to PARAMETERS, SENSORS, AIRFLOW
14. Monitor the AIRFLOW value.
15. After the airflow has settled to a stable value, measure
the actual airflow with a calibrated instrument.
16. Navigate to PARAMETERS, SENSORS, FLOPRESS
17. Monitor the flow pressure.
18. Calculate the new K factor: KFactorNew = AirflowMea-
sured / (FLOPRESS)1/2
19. Calculate the K factor Offset: K_OFFSET = KFactorNew
- factoryKfactor
20. Navigate to PARAMETERS, BALANCE, K_OFFSET
21. Set the new K factor Offset value.
22. Navigate to PARAMETERS, OVERRIDE, FLO_OVRD
23. Return system to normal: FLO_OVRD = ----
Zio - Two Point Balance
1. Change the Wall Module to the contractor view
2. Navigate to PARAMETERS, FLO_CNFG, AREASQFT
3. Verify that the correct duct Area is configured:
4. Obtain the factory zone terminal K factor from the man-
ufacturer data sheet. If the K factor is unknown, use the
value 1400.
5. Navigate to PARAMETERS, FLO_CNFG, K
6. Set the factory K factor.
7. Navigate to PARAMETERS, AIRFLOSP, MIN_FLO
8. Verify the value of minimum flow setpoint.
9. Navigate to PARAMETERS, AIRFLOSP, MAX_FLO
10. Verify the value of maximum flow setpoint.
11. Navigate to PARAMETERS, BALANCE, K_OFFSET
12. Verify that K_OFFSET = 0.
13. Navigate to PARAMETERS, OVERRIDE, FLO_OVRD.
14. Set VAV box override to the minimum occupied airflow
setpoint: FLO_OVRD = LOSP
15. Navigate to PARAMETERS, SENSORS, AIRFLOW
16. Monitor the AIRFLOW for stability at the minimum set-
point value.
17. Navigate to PARAMETERS, BALANCE, MINFLOSP
18. Set the minimum measured flow setpoint: MINFLOSP =
Avg(AIRFLOW)
19. Measure the actual flow with a calibrated instrument.
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