NuAire LabGard NU-581-400, Руководство по эксплуатации и обслуживанию

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OM0302
Rev 2/December 2020 Page 59 of 107
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 the new calibrated downflow value and supply
duty cycle (the blower will turn off upon saving the downflow calibration data).
Now the downflow monitor sensor has been calibrated to the actual measured average
downflow velocity. The cabinet will now control to the downflow setpoint.
Step 7:
•
Press Home icon to return to run mode or continue below to inflow calibration
7.5.3.2 Inflow Calibration
NOTE: INFLOW CALIBRATION MUST BE MADE IMMEDIATELY FOLLOWING DOWNFLOW CALIBRATION. THIS
ASSURES THE CORRECT BALANCE OF DOWNFLOW TO INFLOW AS RELATED TO THE AIRFLOW MONITOR
SENSOR CALIBRATIONS.
Step 1: • Access sensor setup menu.
Step 2: • Now measure the inflow velocity using the recommended procedure found in Table 7.0.
If necessary, adjust the exhaust filter choke located under the front decorative panel, to
achieve the correct average inflow velocity within the stated range of 105
±
5 LFPM (.53
±
.025 m/s).
IF THE AVERAGE INFLOW VELOCITY IS ON THE OUTER EDGE OF THE RANGE (I.E. 100 or 110
fpm (.51 or .56m/s)). IT WOULD BE HIGHLY DESIRABLE TO MOVE IT CLOSER TO THE
SETPOINT BECAUSE THE INFLOW MONITOR SENSOR ONLY FOLLOWS THE EXHAUST
AIRFLOW OF THE BLOWER SYSTEM Having the inflow calibrated to the nominal setpoint
will allow the system to run efficiently and accurately.
NOTE: The choke plate adjustment requires standard blade screwdriver. To adjust, loosen
the liquid-tight fitting around the choke adjustment shaft. While monitoring the exhaust
flow to check position, turning the choke adjustment shaft clockwise will open the choke
while turning counter clockwise closes the choke.
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