Balancing a dual duct system - Metasys - LIT-12011087 - NS-ATV7001-0 - NS-ATV7002-0 - NS-ATV7003-0 - NS-BTV7001-0 - NS-BTV7002-0 - Accessory - Handheld VAV Balancing Sensor/Tool - 6

VAV Balancing Tool and Network Sensors Technical Bulletin

Brand
Metasys
Product name
Handheld VAV Balancing Sensor/Tool
Document type
Technical Bulletin
Document number
LIT-12011087
Version
6
Revision date
2018-11-19
Language
English

To balance a dual duct system:

  1. Use Table 1 to navigate through the VAV Balancing Device menus.
  2. To exit, press the Enter button when EXIT appears on the highest submenu.

Note: Exit the balancing mode before removing power from the handheld balancing tool; this exit returns the VAV controller to normal operation. If you do not exit balancing mode, a delay may occur (while the inactivity timer expires) before the VAV controller returns to normal operation, or if you try to reenter the balancing mode.
Note: Shaded portions of table indicate items that display only in certain applications. Un-shaded portions list items common to all applications.
Table 1. Dual Duct or Dual Duct Exhaust Balancing Sequence

Submenu 1

Submenu 2

Submenu 3

Data Range

Edit-able

Description

Controller Address [25]

--

--

000-127

No

DIP switch address of the Controller. Press the Enter button to move to the next action.

Balance Mode [BAL]

Cold Duct [Cd]

dP Offset [dPO]

00.00-99.99

No

Absolute value of offset in percent. If greater than 10%, the damper may not be closing completely. Verify that the damper shaft has not slipped and is moving freely. Then autocalibrate the dP.

Auto Calibrate dP [ACAL]

No [NO] Yes [YES]

Yes

Select [YES] to close the box and recalibrate the dP Offset.

Flow Setpoint Override [FLSP]

None [NONE] Cooling Max [CMAX] Cooling Min [CMIN] Closed [OFF]

Yes

Once entered, the controller drives to the selected setpoint. The override remains active for 30 minutes (configurable in the controller’s application). Select [NONE] to remove the override from all dampers. The Hot Duct damper is closed when Cold Duct is overriden to Min or Max Flow.

Actual Flow [FLOW]

0001 - 9999

Yes

Displays measured flow until adjusted by user. When adjusted and entered, it triggers controller to recalculate the Gain. (Units may be CFM, L/S, and CM/Hr as determined by application; however, the range is limited to a maximum value of 9999 CM/Hr.)

Box Gain - K Factor [K]

0.001 - 9.999

No

If actual flow is entered, this displays the new current gain (K).

Exit [EXIT]

--

No

Press Enter button to return previous menu. Turn the knob to loop through the current menu.

Balance Mode [BAL] (Cont.)

Hot Duct [Hd]

dP Offset [dPO]

00.00-99.99

No

Absolute value of offset in percent. If greater than 10%, the damper may not be closing completely. Verify that the damper shaft has not slipped and is moving freely. Then autocalibrate the dP.

Auto Calibrate dP [ACAL]

No [NO] Yes [YES]

Yes

Selecting Yes closes the box and recalibrates the dP Offset.

Flow Setpoint Override [FLSP]

None [NONE] Heating Max [HMAX] Heating Min [HMIN] Closed [OFF]

Yes

Once entered, the controller drives to the selected setpoint. The override remains active for 30 minutes (configurable in the controller’s application). Select None to remove the override from all dampers. The Cold Duct damper is closed when Hot Duct is overridden to Min or Max Flow. The Heating Max Flow Setpoint is used only for variable volume dual duct applications. For constant volume dual duct applications, the Cooling Max Flow Setpoint sets the box flow (that is, total flow), and the Heating Max Flow Setpoint is ignored.

Actual Flow [FLOW]

0001 - 9999

Yes

Displays measured flow until adjusted by user. When adjusted and entered, it triggers controller to recalculate the Gain. (Units may be CFM, L/S, and CM/Hr as determined by application; however, the range is limited to a max. value of 9999 CM/Hr.)

Box Gain - K Factor [K]

0.001 - 9.999

No

If actual flow is entered, this displays the new current gain (K).

Exit [EXIT]

--

No

Press the Enter button to return to the previous menu. Turn the knob to loop through the current menu.

Balance Mode [BAL] (Cont.)

Exhaust Duct [EXH]

dP Offset [dPO]

00.00-99.99

No

Absolute value of offset in percent. If greater than 10%, the damper may not be closing completely. Verify that the damper shaft has not slipped and is moving freely. Then autocalibrate the dP.

Auto Calibrate dP [ACAL]

No [NO] Yes [YES]

Yes

Selecting Yes closes the box and recalibrates the dP Offset.

Flow Setpoint Override [FLSP]

None [NONE] Cooling Max [CMAX] Cooling Min [CMIN] Heating Max [HMAX] Heating Min [HMIN] Closed [OFF]

Yes

Once entered, the controller drives to the selected setpoint. Hot Duct damper is closed when Cold Duct is overridden to Min or Max Flow. Similarly, the Cold Duct damper is closed when the Hot Duct is overridden to Min or Max Flow. Also note that if you select Close [OFF], then the Hot Duct, Cold Duct, and Exhaust dampers are all closed. Select None to remove the override from all dampers. The Heating Max Flow Setpoint is used only for variable volume dual duct applications. For constant volume dual duct applications, the Cooling Max Flow Setpoint sets the box flow (that is, total flow), and the Heating Max Flow Setpoint is ignored.

Actual Flow [FLOW]

0001 - 9999

Yes

Displays the measured flow until adjusted by user. When adjusted and entered, it triggers controller to recalculate the Gain.

Pickup Gain - K Factor [K]

0.001 - 9.999

No

If actual flow is entered, this displays the new current gain (K).

Exit [EXIT]

--

No

Press the Enter button to return to the previous menu. Turn the knob to loop through the current menu.

Exit [EXIT]

--

--

No

Press the Enter button to return to the previous menu. Turn the knob to loop through the current menu.

Parameter Mode [PARM]

Flow Setpoints [FLSP]

Cooling Max Flow [CMAX]

0001 - 9999

Yes

Occupied Setpoint Only. Units may be CFM, L/S, and CM/Hr as determined by application.

   

Cooling Min Flow [CMIN]

0000 - 9999

Yes

Occupied Setpoint Only. Units may be CFM, L/S, and CM/Hr as determined by application.

Heating Max Flow [HMAX]

0001 - 9999

Yes

Occupied Setpoint Only. Units may be CFM, L/S, and CM/Hr as determined by application. The Heating Max Flow Setpoint is used only for variable volume dual duct applications. For constant volume dual duct applications, the Cooling Max Flow Setpoint sets the box flow (that is, total flow), and the Heating Max Flow Setpoint is ignored.

Heating Min Flow [HMIN]

0000 - 9999

Yes

Occupied Setpoint Only. Units may be CFM, L/S, and CM/Hr as determined by application.

Differential Flow [dIFF]

-999 - 999

Yes

Displays only in Supply/Exhaust applications. Units may be CFM, L/S, and CM/Hr as determined by application.

Exit [EXIT]

--

No

Press the Enter button to return to the previous menu. Turn the knob to loop through the current menu.

Parameter Mode [PARM] (Cont'd)

Cold Duct [Cd]

Box Area [AREA]

0.001 - 9.999

Yes

Square Feet or Square Meters as determined by the application.

   

Pickup Gain - K Factor [K]

0.001 - 9.999

No

--

dP Offset [dPO]

00.00 - 99.99

No

Absolute value of offset in percent.

Exit [EXIT]

 

No

Press the Enter button to return to the previous menu. Turn the knob to loop through the current menu.

Hot Duct [Hd]

Box Area [AREA]

0.001 - 9.999

Yes

Square Feet or Square Meters as determined by the application.

Pickup Gain - K Factor [K]

0.001 - 9.999

No

--

dP Offset [dPO]

00.00 - 99.99

No

Absolute value of offset in percent.

Exit [EXIT]

 

No

Press the Enter button to return to the previous menu. Turn the knob to loop through the current menu.

Exhaust Duct [EXH]

Box Area [AREA]

0.001 - 9.999

Yes

Square Feet or Square Meters as determined by the application.

Pickup Gain - K Factor [K]

0.001 - 9.999

No

--

dP Offset [dPO]

00.00 - 99.99

No

Absolute value of offset in percent.

Exit [EXIT]

--

No

Press the Enter button to return to the previous menu. Turn the knob to loop through the current menu.

Exit [EXIT]

--

--

No

Press the Enter button to return to the previous menu. Turn the knob to loop through the current menu.

Exit [EXIT]

--

--

--

No

Press the Enter button to return the Network Sensor to normal operation and release the Flow Setpoint override (if required). Turn the knob to loop through the current menu.