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

Page: 54 / 103

OM0295
Rev 2 September 2020 Page 54 of 103
THE EXHAUST VOLUME. If possible, adjust exhaust volume with damper at 60° for maximum
control.
Step 4: Now, measure inflow velocity using the recommended procedure found in Table 7.0. If
necessary, adjust the exhaust system and/or damper to achieve the correct inflow velocity.
Use Table 7.1 to relate downflow and exhaust/inflow volumes and corresponding average
airflow velocities. It is always desirable to achieve airflow values that are set as close as possible
to nominal. If the inflow velocity is calibrated at the outer edge of the range, a greater chance
for alarm conditions would exist due to its closer proximity to the alarm limits.
• Once damper position and/or exhaust volume is set, press SAVE to enter the damper position.
• Press -/ + to change exhaust volume to the value just calibrated using the inflow volume.
NOTE
: Assume downflow velocity is at the nominal value of 60 fpm for exhaust volume calculation purposes as it
will be adjusted during the downflow calibration process.
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