NuAire Labgard NU-430-400, Operation & Maintenance Manual

Page: 18 / 99

OM0228 Page 18 of 99
February/2014
5.2.8 Final Assembly
Remove the protective cardboard cover over the supply and exhaust connections on top of the cabinet. The
exterior surface and viewing glass are easily cleaned with any mild household detergent cleaner using a soft cloth.
Harsh chemicals, solvent ‐ type cleaners and abrasive cleaners should not be used.
Do not attempt to clean the HEPA filter media. Cabinet interior walls or work surface are easily cleaned with any
mild household detergent cleaner using a soft cloth. Turn the cabinet on and let it operate for 60 minutes before
using it as a LFBSC.
5.3 Exhaust/Supply Air Checks
NOTE: THE INTERNAL SUPPLY BLOWER IS INTERLOCKED WITH THE EXHAUST SENSOR,
TO PREVENT OPERATION UNLESS ADEQUATE EXHAUST FLOW IS PRESENT.
5.3.1 Exhaust Volume / Inflow Velocity
The exhaust volume and corresponding inflow velocity is displayed on the front panel. Preset lower and upper
alarm limits are factory set but can be field verified at any time. To insure that adequate exhaust is available for a
dirty exhaust HEPA filter, condition, the nominal exhaust readings should be attainable with the butterfly valve or
damper set at 60 percent open, with all other dampers in the system (duct) open.
5.3.2 Supply Velocity
The supply volume is controlled by the BSCC airflow control system. The BSCC system uses a dual thermistor
airflow sensor in the downflow air stream to monitor and control airflow to setpoint. The control system
automatically compensates for filter loading, voltage variances and other environmental effects. However,
excessive variances caused by remote butterfly valves or dampers, insufficient supply air and dirty prefilters may
cause an airflow alarm condition to occur.
NOTE: THE SUPPLY AIR, IF INTEGRALLY DESIGNED, MUST BE INTERLOCKED WITH
THE INTERNAL FAN RELAY TO ASSURE PROPER OPERATION.
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