NuAire LabGard NU-540-300E, Operation And Maintenance Manual

Page: 39 / 63

OM0280 Page 39 of 63
Rev 3 July/2021
7.5.3.3 PresurFlow ™ Alarm Set Points
The PresurFlow ™ alarm setpoints are preset based on the calibration setpoint. Once the calibration setpoint is
entered, based on a nominal inflow velocity of 105fpm (.53mls) the associated pressure sensor value is
entered as the nominal pressure value High and low alarm setpoints are factory verified and set if needed at
120fpm (.61mls) and 95fpm (.48mls).
However, if specific use alarm setpoints or re-entry of recommended alarm setpoints is desired during the
calibration process, the alarm setpoints may be adjusted by performing the following:
Low Alarm Setpoint
•
Press and hold the hidden and ↓ key for 3 seconds.
(The left red LED will blink and the green LED’s indicate blower speed)
•
Press ↑ or ↓ keys to adjust blower speed to the desired airflow velocity low alarm setpoint value.
•
Left end red LED indicates active low limit blower speed adjust
The red LED will blink as soon as any adjustments are made and will continue to blink as the motor
rpm settles. Once the red LED stops blinking, the motor will run steady state ate the new percentage.
If the low alarm setpoint value is not within an acceptable range, the left end red LED will blink at a
very fast rate.
Note: The red LED must be non-blinking to save or exit.
Note: At any time during the process
•
Press hidden key to accept low alarm setpoint value
•
Press and hold outlet key for three seconds to remove any previous offsets
•
Press key to abort and exit
•
Upon exiting, the blower will go back to actual airflows.
High Alarm Setpoint
•
Press and hold the hidden and ↑ key for 3 seconds.
(The right red LED will blink and the green LED’s indicate blower speed)
•
Press ↑ or ↓ keys to adjust blower speed to the desired airflow velocity high alarm setpoint value.
•
Red end Red LED indicates active high limit blower speed adjust.
The red LED will blink as soon as any adjustments are made and will continue to blink as the motor
rpm settles. Once the red LED stops blinking, the motor will run steady state at the new percentage.
If the high alarm setpoint value is not within an acceptable range, the right end red LED will blink at a
very fast rate.
Note: The red LED must be non-blinking to save or exit.
Note: At any time during the process
•
Press hidden key to accept high alarm setpoint value
•
Press and hold outlet key for three seconds to remove any previous offsets
•
Press key to abort and exit
•
Upon exiting, the blower will go back to actual airflows.
Note: Specific use alarm setpoints or the offset pressure value from the nominal calibration point will
be maintained with a new nominal calibration value. It is not necessary to re-enter the alarm
setpoints after a nominal calibration.
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