BAS-SVU24G-EN
13
It then provides continuously updated values for these points reflecting the status of the Drive to
Maximum and Drive to Minimum operations.
NNoottee:: The changing values displayed on this screen are refreshed at the rate you specify in the
User Preferences dialog box accessed from the Preferences menu.
Drive to Maximum/Minimum Air Flow
Operate the Drive to Maximum and Drive to Minimum air flow functions as follows:
1. Select the DDrriivvee ttoo MMaaxxiimmuumm AAiirr FFllooww radio button and click the SSttaarrtt DDrriivvee ttoo MMaaxx button
to change the damper position so you can take flow measurements at the diffusers.
NNoottee:: If there are multiple diffusers, add all the measurements to obtain the maximum air
flow.
2. Enter the MMeeaassuurreedd AAiirr FFllooww MMaaxxiimmuumm value in the entry box and then press EEnntteerr or tab
out of the entry box.
The results (Air Flow Gain and Air Flow Measurement Offset) are displayed for you in the
Results box. This result is stored while you perform the Drive to Minimum Air Flow
measurements.
3. Select the DDrriivvee ttoo MMiinniimmuumm AAiirr FFllooww radio button and click the SSttaarrtt DDrriivvee ttoo MMiinn button.
NNoottee:: Again, if there are multiple diffusers, add all the measurements to obtain the minimum
air flow.
4. Enter the MMeeaassuurreedd AAiirr FFllooww MMiinniimmuumm value in the entry box and press EEnntteerr, tab out of
the entry box, or click CCaallccuullaattee RReessuulltt.
The final two-point result is displayed.
The Hot Deck Air Valve Balancing Steps Dialog Box
The Hot Deck Air Valve Balancing Steps dialog box is very similar to the Calibrate Air Valve
dialog box. You can perform the same two-point air flow calibration for the hot deck air valve of
an individual dual duct VAV box. The cold deck valve is automatically closed when you are
calibrating the hot deck air valve and vice versa. See the context-sensitive help and “Calibrating
the Air Valve” in the Tracer TU Balancing Tool Help for detailed information.
The Override Dialog Boxes
Use the following four types of dialog boxes to override the air valve (damper), fan, water valve,
and outside air damper configured for individual pieces of equipment. When the specified
duration ends, the override is released and the damper, valve, or fan is returned to its normal
setting.
The Air Flow Override Dialog Box
The Air Flow Override dialog box shown in Figure 8, p. 14 appears when you click the Air Flow
Override SSttaarrtt button on the Flow Calibration screen. You can use this dialog box to drive the
VAV air valve (damper) to the full open, full closed, maximum air flow, or minimum air flow
position for a limited time while you balance the air flow at the diffusers. Click AAppppllyy to start the
override of the air valve while keeping the dialog box open. Click SSaavvee to start the override and
close the dialog box.
BBaallaanncciinngg TTooooll DDiiaalloogg BBooxxeess
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