NuAire LabGard NU-581-400, Operation And Maintenance Manual

Page: 58 / 107

OM0302
Rev 2/December 2020 Page 58 of 107
7.5.3.1 Downflow Calibration
Step 1: • Access Calibration/Service menu.
•
Enter Password
• Press SENSOR SETUP menu item to access sensor calibration menu.
Step 2:
•
Press calibrate downflow sensor. If blower was not running, blower will automatically
turn on. Run for one minute or until downflow readings are steady.
Step 3: • Place a velometer in the cabinet workzone on the horizontal plane 4 inches (102mm)
above the bottom edge of the window. Spot check several points on the recommended
downflow velocity test grid found in table 7.0.
Step 4: • Press +/- to adjust supply duty cycle.
The objective of this spot check is to obtain the desired downflow average velocity as
close as possible to the stated goal of 60 LFPM (.30 m/s)..
DON'T SPEND MORE THAN 5 MINUTES SPOT CHECKING.