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

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OM0295
Rev 2 September 2020 Page 55 of 103
Press SAVE to enter the exhaust volume value. Exit out of calibration menu by pressing
the home icon and leave motor/blower off.
Step 5: Verify the operation of the manual mode pressure switch at this point. Lower the exhaust
volume to 100 CFM (170 CMH) lower than the standard exhaust lower alarm limit.
• Turn off motor/blower
• Block off supply duct connection using cardboard.
• Lower exhaust volume to the pressure switch low trip point stated below
Model Low Alarm Limit Pressure Switch Low Trip Point
CFM (CMH) CFM (CMH)
NU-560-400 629 (1069) 529 (899)
NU-560-600 954 (1621) 854 (1451)
If present, remove cardboard from supply-air intake and turn ON the unit’s blower if it is not ON now.
Remove 1 screw from each of the top right and left sides of the control box and rotate control box
forward to access the pressure switch adjustment. Pressure switch must be adjusted while control box is
open. Adjust as needed (the adjustment dial), until the internal supply blower/motor is deactivated.
Then raise the exhaust volume back up to the standard lower alarm limit to ensure the internal supply
blower/motor turns back ON. Finally, adjust the exhaust system back to the correct inflow velocity and
exhaust volume. Reattach control box and test the activation/deactivation of the pressure switch again
when the control box is back in the vertical position.
Step 6: If present, remove direct reading instrument from window access open area and proceed to
downflow calibration
7.5.3.3 Downflow Calibration
NOTE: If already in Calibration/Service menu, select sensor setup.
Step 1: Access Calibration/Service menu.
Press sensor setup menu item to access sensor calibration menu.
Step 2: Press calibrate downflow sensor to access individual calibration screen. Blower will automatically
be switched to on. Allow blower to run for one minute or until downflow readings are steady.
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