NuAire LabGard NU-813-300, Operation & Maintenance Manual

Page: 38 / 52

OM0236 Page 38 of 52
February/2019
A third test shall be performed to verify the integrity of the seal of the cabinet itself. The same internal reference is used. The
challenge is introduced into the workzone and the exhaust airflow if probed. The leakage shall not exceed .005%.
8.0 Error Messages, Troubleshooting, Option-Diagnostics and Airflow Sensor Performance Verification
Audible alarms and error messages occur for a variety of reasons. Whenever an alarm condition has been present for a
period of at least 10 seconds, the audible alarm/error message will be presented and stay on until the error is cleared. The
audible alarm will be on for 30 seconds upon initial alarm condition, then once every ten seconds. When presented with an
error message, please perform the following:
Step 1: NOTE ALL ERROR MESSAGES.
Error message will appear on the control panel with red LED’s.
Step 2: VERIFY ERROR MESSAGES.
Error messages can be verified by clearing the error function by either turning the blower or the cabinet on
and off.
Step 3: MONITOR RE-OCCURRENCE OF ERROR MESSAGES.
If re-occurrence of the error message is immediate or daily, use the following guide to correct the situation.
8.1 Error Message Troubleshooting Guide
Issue Error Description Correction

Window Alarm
(Window High)
Hinged window is above standard
working height or micro switch is not
operating properly.
Verify standard working height and
window micro switch operation.
Cabinet fluorescent
lights won’t Turn on
Blue LED above light key indicates the
lamp should be on.
Check light fuse on main control board.
Check fluorescent lamps.
Check voltage coming out of main control
board to light ballasts.
Check light starters, if present.
Check ballast.
Cabinet blower won't
turn on.
Green LED above blower key indicates
the blower should be on.
Airflow Alarm.
Check blower fuse on main control board.
Check AC voltage coming out of main
control board.
Check wiring to blower.
Check blower motor.
Check DC motor PWM signal on main
control board.
Red alarm LED blinks
Indicates a power interruption has
occurred.
Press any key to clear.
Blower or light fuse
continues to blow after
replacement.
N/A
Check for short on output of fuse.
Isolate output of fuse by disconnecting
control center connectors, light circuit,
AC or DC blower circuit, etc. to isolate the
short.
PresurFlow™
left red LED indicator on
and red LED alarm
PresurFlow™ reading low flow
(pressure)
Check airflow values.
Check blower function.
Recalibrate PresurFlow™ system.
PresurFlow™
right red LED indicator
on
and red LED alarm
PresurFlow™ reading high flow
(pressure)
Check airflow values.
Recalibrate PresurFlow™ system.
All PresurFlow™
LED’s blink
Message acknowledges new
firmware was loaded into
microprocessor
N/A
Blower red LED blinks
and red LED alarm
Indicates that the motor rpm signal
has been interrupted
Check connectors and wires from main
control board to the motor
Replace motor if required