NuAire NU-475-300 Manual

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CELLGARD ES Energy Saver Class II,
Type A2 Laminar Flow
Biological Safety Cabinet
Models
NU-475-300/400/500/600
Bench/Console
Operation & Maintenance Manual
January, 2011
Revision 1
(Series 1 & Higher)
Manufactured by:
NuAire, Inc.
2100 Fernbrook Lane
Plymouth, Minnesota USA 55447
Toll Free: 1-800-328-3352
In MN: 763-553-1270
Fax: [phone]
NU-475-400/500/600 Only

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Congratulations!
You have just purchased one of the finest Laminar Flow Biological Safety Cabinets available. With proper care,
maintenance (certification), and laboratory procedure, this cabinet will give you years of product and personnel protection
from particulate contaminants as prescribed in NSF/ANSI 49. Please read this manual carefully to familiarize you with
proper installation, maintenance and operation of the cabinet. Other reference and guideline materials are available
through the following web sites.
www.hc-sc.gc.ca
www.cdc.gov/od/ohs/
www.absa.org
www.absa-canada.org
www.ebsa.be
www.inspection.gc.ca
www.who.int
www.biosafety.be
www.hse.gov.uk
www.nsf.org
www.cetainternational.org
www.osha.gov/dts/osta/
www.nuaire.com

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ABOUT THIS OPERATION & MAINTENANCE MANUAL
The information contained in this manual is intended to reflect our current production standard configuration model along
with the more frequently purchased options. Any unique additions/modifications/shop drawings are appended in the back
flap of this manual, along with any modifications and/or additions to procedures as outlined in this manual. A copy of the
original factory test report is also appended to this manual. In case this manual and/or test report is lost or misplaced,
NuAire retains a copy in our files. A replacement copy can be obtained by calling or writing NuAire, Inc. stating the
model number and serial number and a brief description of the information desired.

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CELLGARD ES Energy Saver Class II, Type A2
Laminar Flow Biological Safety Cabinet
Models NU-475-300/400/500/600
Operation & Maintenance Manual
TABLE OF CONTENTS
Section No. 1..........................................................General Information
Section No. 2..........................................................Models & Features
Section No. 3..........................................................Warranty
Section No. 4..........................................................Shipments
Section No. 5..........................................................Installation Instructions
5.1 ..........................................................................Location
5.2 ..........................................................................Set-up Instructions
5.3 ..........................................................................Certification Testing Methods and Equipment
Section No. 6..........................................................Operating the NU-475
6.1 ..........................................................................Operator Controls & Indicators
6.2 ..........................................................................Operating Guidelines
6.3 ..........................................................................Operating Sequence
6.4 ..........................................................................Ergonomics
6.5 ..........................................................................Cleaning Procedure
6.6 ..........................................................................Hazardous Drug Decontamination Procedure
Section No. 7..........................................................General Maintenance
7.1 ..........................................................................Decontamination
7.2 ..........................................................................Fluorescent Lamp Bulb Replacement
7.3 ..........................................................................HEPA Filter/Motor Replacement
7.4 ..........................................................................Sliding Window Replacement & Adjustment
7.5 ..........................................................................Airflow Calibration
7.6 ..........................................................................HEPA Filter Leak Test
7.7 ..........................................................................Airflow Smoke Pattern Test
7.8 ..........................................................................Site Installation Assessment Tests
7.9 ..........................................................................Cleanliness Classification Test for Pharmacy Application
Section No. 8..........................................................Error Indicators & Troubleshooting
Section No. 9..........................................................Remote Contacts
Section No. 10........................................................Optional Equipment
10.1 ........................................................................Ultraviolet Light
Section No. 11........................................................Electrical/Environmental Requirements
Section No. 12........................................................Disposal and Recycle
MANUAL DRAWINGS
ACD-14251.....................................NU-475 Airflow Schematic
BCD-14243.....................................NU-475-300 Specification Drawing
BCD-14244.....................................NU-475-400 Specification Drawing
BCD-14245.....................................NU-475-500 Specification Drawing
BCD-14246.....................................NU-475-600 Specification Drawing
BCD-11815.....................................Drain Valve Installation
BCD-11816.....................................Front Panel
ASSEMBLY DRAWINGS
BCD-05147.....................................Base Stand Assembly
BCD-05146.....................................Base Stand Storage Cabinet Assembly
BCD-11817.....................................Control Center & Front Decorative Panel Assembly
BCD-11686.....................................Sliding Window Assembly & Adjustment
BCD-11819.....................................Base Cabinet Assembly
BCD-12271.....................................Window Assembly Hinge Operation
ELECTRICAL SCHEMATICS
BCD-14240.....................................NU-475-300/400/500/600 Electrical Schematic

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CELLGARD ES Energy Saver Class II, Type A2
Laminar Flow Biological Safety Cabinet
Models
NU-475-300/400/500/600
MANUFACTURED BY:
NuAire, Inc. - Plymouth, Minnesota, U.S.A.
1.0 General Information
1.1 Description
The CELLGARD ES Model NU-475 Laminar Flow Biological Safety Cabinet (LFBSC) is a bench/table top
model, optionally available with a base support stand, for operation as a console model. The CELLGARD ES model
NU-475 utilizes an Energy Saver DC ECM motor optimally determined forward curved fan for each model size/width to
maximize both energy efficiency and filter loading capacity. The Energy Saver ECM motor is controlled via a solid-state
DC motor controller that provides automatic compensation (constant volume control) for both filter loading and line
voltage variances.
The Laminar Flow Biological Safety Cabinet, (LFBSC) is a product resulting from the development of the
"laminar flow" principle and the application of environmental controls as required in the field of biological research or
chemical containment. The LFBSC, when used with proper technique, is an effective laboratory aid in obtaining the
optimum control over product quality while reducing the potential for exposure of both product and personnel to airborne
biological or particulate chemical agents in low to moderate risk-hazard research and drug preparation or product
operations, as prescribed by the Center for Disease Control (CDC) Atlanta, Georgia.
The NU-475 bench LFBSC is known as a Class II, Type A2 Biological Safety Cabinet. This is possible since
NuAire's cabinet conforms to the following requirements:
1. Maintains inflow velocity of 100 LFPM (.51m/s) through the work access opening.
2. Has HEPA filtered downflow air that is mixed with the inflow air from a common exhaust plenum.
3. Exhaust airflow can either be room re-circulated or exhausted outside using a canopy exhaust transition.
4. Has all biologically contaminated ducts and plenums under negative pressure or surrounded by negative
pressure. (Type A1 permits positive pressure contaminated ducts and plenums).
Cabinets used for work with minute quantities of volatile toxic chemicals and traces amounts of
radionuclides required as an adjunct to microbiological studies must be exhausted through properly
functioning exhaust canopies.

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1.2 Safety Instructions
These safety instructions describe the safety features of the CELLGARD ES Model NU-475 LFBSC.
The safety cabinet has been manufactured using the latest technological developments and has been thoroughly
tested before delivery. It may, however, present potential hazards if it is not used according to the intended
purpose or outside of operating parameters. Therefore, the following procedures must always be observed:
The safety cabinet must be operated only by trained and authorized personnel.
For any operation of this unit, the operator must prepare clear and concise written instructions for
operating and cleaning, utilizing applicable safety data sheets, plant hygiene guidelines, and technical
regulations, in particular.
owhich decontamination measures are to be applied for the cabinet and accessories,
owhich protective measures apply while specific agents are used,
owhich measures are to be taken in the case of an accident.
Repairs to the device must be carried out only by trained and authorized expert personnel.
Keep these operating instructions close to the unit so that safety instructions and important information
are always accessible.
Should you encounter problems that are not detailed adequately in the operating instructions, please
contact your NuAire Representative of NuAire technical Services.
1.3 Explanation of Symbols
NOTE:
CAUTION used without the safety alert symbol
indicates a potentially hazardous situation which, if
not avoided, may result in property damage.
Potential electrical hazard, only qualified person
to access.
Used for important information.
Biohazard
Ground, Earth
CAUTION:

Lead Free Chemical Hazard
Flammable Hazard
Hazardous Gases! Personal
Protection Equipment Required.
Safety alert symbol indicates a potentially
hazardous situation which, if not avoided, could
result in death of serious injury.
Safety alert symbol indicates a potentially hazardous
situation which, if not avoided, may result in minor
or moderate injury.
WARNING
!
CAUTION
!

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2.0 Models & Features
The model NU-475, Class II, Type A2 Laminar Flow Biological Safety Cabinet is manufactured in four sizes:
3 ft., 4 ft., 5 ft., and 6 ft.

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3.0 Warranty
NuAire, Inc. warrants Class II, Type A2 w/ECM Motor (CELLGARD ES) that it will repair F.O.B. its factory or
furnish without charge F.O.B. its factory a similar part to replace any material in its equipment including HEPA Filters
within 60 months after the date of sale if proved to the satisfaction of the company to have been defective at the time it
was sold provided that all parts claimed defective shall be returned, properly identified to the company at its factory,
charges prepaid. Factory installed equipment or accessories are warranted only to the extent guaranteed by the original
manufacturer, and this warranty shall not apply to any portion of the equipment modified by the user. Claims under this
warranty should be directed to NuAire, Inc. setting forth in detail the nature of the defect, the date of the initial installation
and the serial and model number of the equipment.
This warranty shall not apply to any NuAire product or part thereof which has been subject to misuse, abuse,
accident, shipping damage, improper installation or service, or damage by fire, flood or acts of God. If the serial number
of this product is altered, removed or defaced as to be illegible, the Warranty shall be null and void in its entirety.
The warranty is for the sole benefit of the original purchaser and is not assignable or transferable. Prior to
returning any item, for any reason, contact NuAire for a Return Authorization Number. This number must accompany all
returns. Any product shipped to NuAire without this number will be returned refused shipment or collect freight.
4.0 Shipments
NuAire takes every reasonable precaution to assure that your CELLGARD ES cabinet arrives without damage.
Motor carriers are carefully selected and shipping cartons have been specially designed to insure your purchase.
However, damage can occur in any shipment and the following outlines the steps you should take on receipt of a NuAire
CELLGARD ES cabinet to be sure that if damage has occurred, the proper claims and actions are taken immediately.
4.1 Damaged Shipments
4.1.1 Terms are factory, unless stated otherwise. Therefore, it is important to check each shipment before
acceptance.
4.1.2 If there is visible damage, the material can be accepted after the driver makes a notation on the
consignee's copy of the freight bill. Then an inspection must be made to verify the claim against the
carrier. This inspection is the basis of your filing the claim against the carrier.
4.1.3 If concealed damage is found, it is absolutely necessary to NOTIFY THE FREIGHT AGENT AT ONCE,
and request a inspection. Without this inspection, the transportation company may not accept a claim for
loss or damage. If the carrier will not perform the inspection, an affidavit must be prepared stating that he
was contacted on a certain date and that he failed to comply with the request. This along with other
papers in the customer's possession will support the claim.

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5.0 Installation Instructions
5.1 Location
Within the laboratory, pharmacy, etc., the ideal location of the biological safety cabinet is away from personnel
traffic lanes, air vents (in or out), doors and/or any other source of disruptive air currents.
If drafts or other disruptive air currents exceed the inflow velocity of the cabinet through the access opening, the
potential exists for contaminated air to exit or enter the work zone area of the cabinet. It depends on the severity
of the air current. REMEMBER: A BIOLOGICAL SAFETY CABINET IS NO SUBSTITUTE FOR
GOOD LABORATORY TECHNIQUE.
Where space permits, a clear 6" (152mm) area should be permitted on each side of the cabinet for maintenance
purposes. The electrical outlet into which the cabinet is connected should be readily accessible for maintenance
purposes. Do not position the cabinet to prevent access to the power cord. The power cord plug serves as the
disconnect and should remain readily accessible. If the outlet is inaccessible, such as a conduit (hardwired)
connection, then an appropriate warning label should be applied near the cabinets on/off switch to indicate the
circuit breaker on the power distribution panel to be used. A MINIMUM CLEARANCE OF 6" (152MM) IS
REQUIRED FROM THE TOP OF THE CABINET TO THE CEILING FOR PROPER VENTILATION OF THE
EXHAUST EFFLUX.
If this cabinet is used in a pharmacy application, Per OSHA, NIOSH, and ASHP, it is strongly recommended
that the cabinet be exhausted to the outside. In addition, if this cabinet is used in microbiological application
with minute quantities of volatile toxic chemicals and tracer amounts of radionuclides, Per CDC/NIH and NSF it
is strongly recommended that the cabinet be exhausted to the outside. NuAire offers a canopy type of
exhaust transition, which will capture the exhaust efflux from the cabinet.
Canopy, Thimble or Air Gap Exhaust Transitions (with and without integral fan)
THE EXHAUST SYSTEM SHOULD BE FITTED WITH A BACKDRAFT
DAMPER TO PREVENT REVERSING OF AIRFLOW IN THE SYSTEM.
NuAire strongly recommends a canopy or thimble exhaust for most applications. See separate instruction
sheets for a discussion of exhaust transitions and installation requirements.
5.2 Set-Up Instructions
Remove outer shipping protection (carton or crating). The cabinet is fastened to the base skid and it is usually the
best procedure to leave the skid in place until the cabinet is located in its approximate position to facilitate ease in
handling. It can then be removed from the skid by removing the banding, bolts and screws holding the cabinet to
the skid. It may be necessary to remove the Control Center in order to gain passage through a doorway. It may
easily be removed by following the instructions on drawing BCD-11817.
NOTE:


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5.2.1 Base Stand Assembly
The base stand is shipped knocked down in a separate carton and is assembled per drawing BCD-05147 if
accompanied with the unit. Remove the banding holding the cabinet to the base skid. Lift the cabinet
from the base skid and place on the floor. Now lift the cabinet on top of the base and bolt the base stand
to the cabinet using two 3/8" - 16 x 3/4" bolts and washers provided for the front base stand tabs and two
1/4" acorn nuts for the rear weld studs. Place the cabinet in its desired location.
The base stand storage cabinets will usually be shipped according to customer requirements. If it is
shipped unassembled, it can be assembled per drawing BCD-05146. It is recommended that the upper
and lower base stand braces be installed first, then the rear and bottom panels (the end panels are
always prefastened). Once assembled, fasten the cabinet per the above instructions.
Remove the plastic cap protecting the drain valve threads and install the drain valve, on the bottom right
front of the cabinet using Loctite 242 furnished to the threads and rotate the valve body until it is secure
(see BCD-11815).
5.2.2 Leveling
Using a level placed on the work tray, adjust the leg levelers, first, end to end, then, front to back. The
NSF approved leg levelers provide a 3/4" (19mm) adjustment.
5.2.3 Bench Installation (BCD-11815)
Place the cabinet on the bench with approximately a 2" (51mm) overhang clearance for installation of the
drain valve. If the drain valve is not desired, place the cabinet in its desired location and using RTV
sealant seal all around the base of the cabinet and the bench. This provides a tight seal to prevent bench
spills from migrating under the cabinet.
If a drain valve is desired, remove the handle from the valve stem to gain clearance for valve body
rotation. Add Loctite 242 (furnished) to the threads and rotate valve body until secure, with the valve
stem (for handle) on the left side. Re-install handle to valve stem. Adjust the cabinet on bench to provide
a 2" (51mm) overhang and seal the interface of the bench and cabinet, using RTV sealant as above.
5.2.4 Gas Service
NuAire doesn't recommend the use of natural gas within the BSC, but if gas service is determined to be
necessary for the application, appropriate safety measures must take place. All NuAire BSC's have
precautionary warning labels that say the following:
Use of explosive or flammable substances in this cabinet
should be evaluated by your appropriate safety personnel.
Once the determination has been made by the appropriate safety personnel, the application of natural gas
must be performed in accordance to national, state and local codes. IT IS ALSO STRONGLY
RECOMMENDED THAT AN EMERGENCY GAS SHUTOFF VALVE BE PLACED JUST
OUTSIDE THE BSC ON THE GAS SUPPLY LINE.
All NuAire BSC's meet the safety requirements of UL and CSA for Laboratory Equipment. To comply
with these safety requirements, NuAire uses only certified gas valves. In addition, if external piping is
required, only black pipe is used for this application.
As previously stated NuAire doesn't recommend the use of natural gas within the BSC and ASSUMES
NO RESPONSIBILITY FOR ITS USE. USE AT YOUR OWN RISK. The Bunsen burner flame
within the BSC not only contributes to heat build-up; is also disrupts the laminar air stream, which must
be maintained for maximum efficiency. IF THE PROCEDURE DEMANDS USE OF A FLAME, A
BUNSEN BURNER WITH ON DEMAND IGNITION IS STRONGLY RECOMMENDED. DO
NOT USE CONSTANT FLAME GAS BURNERS. During use, the Bunsen burner should be placed to
the rear of the workspace where resulting air turbulence will have a minimal effect.
CAUTION
!

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5.2.5 Plumbing Services
Service ball valves with the type of service specified by the removable button on the handle are located
in the work zone. The service ball valves are not recommended for pressure over 75 p.s.i. (5.2 BAR).
Reducing valves should be installed external to the cabinet if necessary. Service ball valves should never
be used for flammable gasses or oxygen service. A special needle valve for oxygen service or certified
valve is required and available upon request.
External connection is to 3/8 inch NPT coupling in the inner sidewalls. Connection to plant utilities
should be made with proper materials for the individual service and according to National and/or Local
codes. Observe all labels pertaining to the type of service and operating pressure.

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NOTE:
5.2.6 Electrical Services
The NU-475 series Biological Safety Cabinets may be "hardwired" (optional) or connected via an
electrical power cord which is standard. The unit requires 115 VAC, 60 Hz, single phase (current rating
varies per cabinet size, reference Electrical/Environmental Requirements). It is recommended that power
to the unit be on its own branch circuit, protected with a circuit breaker or fuse at the distribution panel.
PLEASE NOTE, THIS UNIT CONTAINS ELECTRONIC BALLASTS FOR THE
FLUORESCENT LIGHTING. ELECTRONIC BALLASTS OPERATE WITH HIGH INRUSH
CURRENT. IT IS NOT RECOMMENDED TO USE THIS PRODUCT WITH GROUND FAULT
CIRCUIT INTERRUPTERS (GFCI'S) BECAUSE THE BALLASTS MAY CAUSE THE GFCI
TO TRIP.
5.2.7 Final Assembly
REMOVE THE PROTECTIVE CARDBOARD COVER OVER THE EXHAUST HEPA FILTER.
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 Certification Testing Methods and Equipment
After installation and prior to use, NuAire recommends that the cabinet be certified or commissioned to factory
standards. At a minimum, the following tests should be performed.
1. HEPA filter leak test
2. Downflow velocity test
3. Inflow velocity test
4. Airflow smoke patterns
5. Site installation assessment tests
The testing methods and equipment required are specified on the factory inspection report included with this
manual (see insert in back cover).
IT IS RECOMMENDED THAT THESE TESTS BE PERFORMED BY A QUALIFIED TECHNICIAN
WHO IS FAMILIAR WITH THE METHODS AND PROCEDURES FOR CERTIFYING BIOLOGICAL
SAFETY CABINETS (SEE INSERT).
AFTER THE INITIAL CERTIFICATION, NUAIRE RECOMMENDS THAT THE CABINET BE
RECERTIFIED AT A MINIMUM ON AN ANNUAL BASIS AND AFTER EVERY FILTER CHANGE
OR MAINTENANCE ACTION OR ANY TIME THE OPERATOR FEELS IT IS NECESSARY.
Note that the CELLGARD ES cabinets, filters and seals provide premium performance; Quality Control in both
design and manufacturing assure superior reliability. However, protection to both product and operator is so vital
that certification to the performance requirements should be accomplished as stated to ensure biological safety
established by the factory standards.


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CELLGARD ES Energy Saver
Class II, Type A2 Laminar Flow
Biological Safety Cabinet
Models NU-475-300/400/500/600
Catalog Number
Catalog Number NU-475-300
Nominal 3 foot (0.9m) NU-475-400 Nominal 4 foot (1.2m) NU-475-500 Nominal 5 foot (1.5m) NU-475-600 Nominal 6 foot (1.8m)
Performance Specifications:
NSF/ANSI 49 NSF/ANSI 49 NSF/ANSI 49 NSF/ANSI 49
NSF/ANSI 49 Class Class II, Type A2 Class II, Type A2 Class II, Type A2 Class II, Type A2
Style of Cabinet Bench top/console w/base
stand/storage cabinet Bench top/console w/base stand/storage cabinet Bench top/console w/base stand/storage cabinet Bench top/console w/base stand/storage cabinet
Cabinet Construction All welded stainless steel
16GA, Type 304 pressure
tight design
All welded stainless steel
16GA, Type 304 pressure
tight design
All welded stainless steel
16GA, Type 304 pressure
tight design
All welded stainless steel
16GA, Type 304 pressure
tight design
Diffuser for Air Supply (Metal) Non-flammable Non-flammable Non-flammable Non-flammable
HEPA Filter Seal Type:
Supply Filter-99.995% Eff. on 0.3 microns
Exhaust Filter-99.995% Eff. on 0.3 microns
HEPEX Seal
Neoprene, Springloaded
HEPEX Seal
Neoprene, Springloaded
HEPEX Seal
Neoprene, Springloaded
HEPEX Seal
Neoprene, Springloaded
Fumigation : Automated per NIH/NSF,
Procedures Yes Yes Yes Yes
Standard Services:
Service Coupling (3/8 inch NPT)
Gas Valve/Service Coupling (3/8inch NPT)
Outlet
One, Right Sidewall
One, Right Sidewall
Two, Backwall Center
One, Right Sidewall
One, Right Sidewall
Two, Backwall
One, Right Sidewall
One, Right Sidewall
Two, Backwall
One, Right Sidewall
One, Right Sidewall
Two, Backwall
Optional Services:
Gas Cocks 3/8" NPT
Ultraviolet Light
Standard/Cup Sinks
Up to 3 ea. Sidewall
One, Backwall
Left or Right Work
Surface
Up to 3 ea. Sidewall
One, Backwall
Left or Right Work
Surface
Up to 3 ea. Sidewall
One, Backwall
Left or Right Work
Surface
Up to 3 ea. Sidewall
One, Backwall
Left or Right Work
Surface
Cabinet Size Inches (mm):
Height (Fully Assembled)
Height (Minimum for Transport)
Width
Depth (with Control Center)
And Armrest Removed
61 7/8 (1572)
59 (1499)
41 5/8 (1057)
33 (838)
61 7/8 (1572)
59 (1499)
53 5/8 (1362)
33 (838)
61 7/8 (1572)
59 (1499)
65 5/8 (1669)
33 (838)
61 7/8 (1572)
59 (1499)
77 5/8 (1972)
33 (838)
Work Access Opening Inches (mm):
Standard Opening Height/Optional
Standard Inflow Velocity
8 (203)
105 FPM (.53 m/s)
10 (254)
105 FPM (.53 m/s)
10 (254)
105 FPM (.53 m/s)
10 (254)
105 FPM (.53 m/s)
Work Zone Inches (mm):
Height
Width
Depth measured at 8 inches (203mm)
window height
28 1/2 (724)
34 3/8 (873)
26 1/8 (664)
28 1/2 (724)
46 3/8 (1178)
26 1/8 (664)
28 1/2 (724)
58 3/8 (1483)
26 1/8 (664)
28 1/2 (724)
70 3/8 (1788)
26 1/8 (664)
Viewing Window Inches (mm):
Standard is Safety Plate Sliding Glass
Fully closed to
18 (457) open
8 (203) opening
Fully closed to
18 (457) open
10(254) / 8(203) opening
Fully closed to
18 (457) open
10(254) / 8(203) opening
Fully closed to
18 (457) open
10(254) / 8(203) opening
Required Exhaust CFM/CMH
Standard/Optional:
Thimble (NU-918/917)
Thimble (NU-916)
8 (203) opening
282 (479)
306 (519)
10(254) / 8(203) opening
438 (739) / 370 (624)
462 (783) / 394 (667)
10(254) / 8(203) opening
542 (921) / 456 (775)
566 (962) / 480 (813)
10(254) / 8(203) opening
647 (1100) / 545 (925)
669 (1139) / 567 (964)
Plant Duct Static Pressure Eng/Metric 0.05-0.1"/1.27-2.54mm 0.05-0.1"/1.27-2.54mm 0.05-0.1"/1.27-2.54mm 0.05-0.1"/1.27-2.54mm
Heat Rejected, BTU, Per Hour
(non-vented)
(vented)
8 (203) opening
826
120
10(254) / 8(203) opening
1140/1020
157
10(254) / 8(203) opening
1768/1611
198
10(254) / 8(203) opening
1884/1768
198
Electrical:
Volts, AC 60 Hz
+Amps: Blower/Lights (10/8 openings)
Amps: Duplex
Rated Amps:
12 ft. Power Cord (one)
U.L./U.L.-C Listed
115
2.1
3
12
14 GA - 3 Wire, 15A
U.L./U.L.-C Listed
115
2.9/2.6
3
12
14 GA - 3 Wire, 15A
U.L./U.L.-C Listed
115
4.5/4.1
3
14/*12
*12/14 GA-3 Wire,
20A Std., 15A Optional
U.L./U.L.-C Listed
115
4.8/4.5
3
14/*12
*12/14 GA-3 Wire,
20A Std., 15A Optional
Crated Shipping Weight: ***
Net Weight 475 lbs. / 215 kg. 425 lbs. / 193 kg. 550 lbs. / 249 kg. 500 lbs. / 227 kg. 650 lbs. / 295 kg. 600 lbs. / 273 kg. 730 lbs. / 331 kg. 680 lbs. / 308 kg.
*15A Configuration does not include accessory outlet.
***Crated shipping weight does not include weight for accessories or options
+ Based on cabinet with new filters running at 115VAC.

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6.0 Operating the NU-475
6.1 Operator Controls & Indicators
The following is a description of the controls and indicators found on both the front panel
(see Drawing BCD-11816) and cabinet.
6.1.1 Circuit Breaker-Blower (Top of Control Center)
The motor/blower is protected with a circuit breaker. The circuit breaker in conjunction with the motor's
thermal protector is designed to open under locked rotor or half-wave power conditions. Should the
circuit breaker open (pop-out button will appear) merely depress to reset. If the circuit breaker
continually opens, a failure has occurred in the motor or solid-state speed controller. Consult a qualified
repair technician or NuAire, Inc. for replacement.
6.1.2 Circuit Breaker-Outlets (Top of Control Center)
The duplex outlet located in the sidewall of the work area is protected with a 3 amp circuit breaker. The
circuit breaker may trip at 110% of load rating but will trip at 145% of load rating in less than 2 seconds.
Should the circuit breaker open, (pop-out button will appear), unplug the appliance plugged into the outlet
and merely depress the pop-out button to reset.
6.1.3 Fluorescent/U.V. Light Switch
This switch provides on/off control for the fluorescent light and/or the ultraviolet (U.V.) light if present
(optional). With the U.V. light option, the switch provides for on-center off-on operation so that both the
fluorescent light and the U.V. light cannot be energized at the same time. The UV light is also
interlocked, so it will only operate if the sliding window is closed. Proper care should be exercised when
the U.V. light is on.
6.1.4 Outlet Switch
This switch provides on/off control for the 115 VAC power available in the outlet(s) within the cabinet
workzone.
6.1.5 Blower Switch
The blower switch applies power to the internal motor/blower when in the ON position. The blower
switch also has a second set of poles, which are available for use as a contact closure for an exhaust
system. In addition, power can be applied to the accessory outlet located on the upper left corner of the
cabinet, behind the front window assembly.
The purpose of the outlet is to provide "switched" power for the following:
1) Exhaust transition with integral blower
2) To power a low power appliance, such as the low airflow alarm.
The rating of the outlet is 115 VAC at 2 amp maximum.
6.1.6 Indicator Light
An indicator light is located above the Blower on/off switch and indicates when power is applied to the
blower.
6.1.7 Audible Alarm Enable
As the sliding window is raised above its normal working height, a micro switch located in the glide
channel activates both an audible and visual alarm. This switch disables the audible alarm but will not
disable the red indicator visual alarm.