NuAire LabGard ES NU-565-400, Operation & Maintenance Manual

Page: 56 / 105

OM0301
August 20 Page 56 of 105
Step 3: Set damper position to 60
°
on the display. Nuaire recommends using the damper position
at 60 ° to minimize static loss and maximum controllability of the system. However, THE
DAMPER CAN RANGE FROM 35
°
TO 75
°
FOR ITS NOMINAL SETPOINT. ANY POSITION OUTSIDE
THIS RANGE WILL SEVERELY LIMIT THE CONTROL SYSTEMS ABILITY TO ACCURATELY CONTROL
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.