NuAire LabGard NU-560-400, Operation & Maintenance Manual

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OM0295
Rev 2 September 2020 Page 56 of 103
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
Step 4: Press + or – button of supply duty cycle to adjust blower speed.
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.
Step 5: Now, measure the average downflow velocity over the entire workzone using the recommended
downflow velocity test grid (see Table 7.0).
Step 6: Press +/- to change the calibrated downflow value to the average downflow velocity just found.
Press SAVE to enter both the supply duty cycle and the new calibrated downflow value.
Now, the downflow monitor sensor has been calibrated to the actual measured average
downflow velocity. The cabinet will now control to the downflow setpoint.
• Now, the calibration procedure is complete. If desired, a spot check in the downflow
velocity may be performed if felt necessary.
• Press home icon to exit into run mode.
7.5.3.4 Night Setback Calibration (Optional)
The night set back calibration is performed within the calibration mode after the inflow and downflow
calibration procedure is complete.
NOTE: If night setback exhaust airflow is reduced by the Building Automation System (BAS) and not by
the NuAire model NU-951-012 valve, this calibration procedure is not necessary. However, it
would still be recommended to use the contacts on the main control board to initiate the night
setback option to display night setback active, inhibit exhaust alarms, light, and internal blower.
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