NuAire BR Series Operation & Maintenance Manual
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NuAire BR Series Operation & Maintenance Manual

Labgard es energy saver class ii, type b1 laminar flow, biosafety cabinet
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Labgard ES Energy Saver Class II,
Type B1 Laminar Flow
Biosafety Cabinet
Models
NU-427-400E/600E
Bench/Console
Operation & Maintenance Manual
NU-427-400E/600E Series BR
Revision 2 September 2020
Manufactured By:
Nuaire, Inc.
2100 Fernbrook Lane
Plymouth, MN 55447
Toll-Free: 1-800-328-3352
In Minnesota: (763)-553-1270
Fax: (763)-553-0459
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  • Page 1 Type B1 Laminar Flow Biosafety Cabinet Models NU-427-400E/600E Bench/Console Operation & Maintenance Manual NU-427-400E/600E Series BR Revision 2 September 2020 Manufactured By: Nuaire, Inc. 2100 Fernbrook Lane Plymouth, MN 55447 Toll-Free: 1-800-328-3352 In Minnesota: (763)-553-1270 Fax: (763)-553-0459 Page 1 of 102...
  • Page 2 NSF/ANSI 49. Please read this manual carefully to familiarize yourself 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 OM0298 September/2020 Page 2 of 102...
  • Page 3 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 on file. A replacement copy can be obtained by calling or writing Nuaire, Inc.

  • Page 4: Table Of Contents

    Labgard ES Energy Saver Class II, Type B1 Laminar Flow Biosafety Cabinet Models NU-427-400E/600E 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.
  • Page 5 Laminar Flow Biosafety Cabinet Models NU-427-400E/600E MANUFACTURED BY: Nuaire, Inc. - Plymouth, Minnesota, U.S.A. General Information 1.1 Description The LABGARD ES Model NU-427 Laminar Flow Biosafety Cabinet (BSC) is a bench/table top model, optionally available with a base support stand, for operation as a console model. The LABGARD ES model NU-427 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.
  • Page 6 Keep these operating instructions close to the cabinet 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...
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  • Page 8 Models & Features The model NU-427, Class II, Type B1 Laminar Flow Biosafety Cabinet is manufactured in two sizes: 4 ft. (1.2m) and 6 ft. (1.8m). OM0298 September/2020 Page 8 of 102...
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  • Page 11 However, damage can occur in any shipment and the following outlines the steps you should take on receipt of a Nuaire LABGARD ES cabinet to be sure that if damage has occurred, the proper claims and actions are taken immediately.

  • Page 12: Location

    Installation Instructions 5.1 Location Within the laboratory, pharmacy, etc., the ideal location of the biosafety 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.

  • Page 13: Set-Up Instructions

    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 be taken. All Nuaire BSC's have precautionary warning labels that say the following:...
  • Page 14 All Nuaire BSCs 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.
  • Page 15 30 minutes with no more than a 10% drop in pressure, and be properly vented to the atmosphere to disperse exhausted air. 8. A local manual exhaust flow damper (Nuaire Model NU-940) should be readily accessible (either directly mounted on the BSC exhaust collar or just above the BSC) for the maintenance technician/certifier to allow the BSC to be sealed for decontamination purposes.
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  • Page 18: Exhaust Air Checks

    5.4 Certification Testing Methods and Equipment After installation and prior to use, Nuaire recommends that the cabinet be certified or commissioned to factory standards. As a part of certification, the certifier should go through the following initial checklist to assure all aspects of the BSC installation are complete and ready for certification.
  • Page 19 Labgard ES Energy Saver Class II, Type B1 Laminar Flow Biosafety Cabinet Models NU-427-400E/600E Catalog Number Catalog Number NU-427-400E NU-427600E Nominal 4 foot (1.2m) Nominal 6 foot (1.8m) Performance Specifications 1. Personal Protection NSF/ANSI 49 NSF/ANSI 49 2. Product Protection NSF/ANSI 49 Class Class II, Type B1 Class II, Type B1...

  • Page 20: Biosafety Cabinet Control

    Operating the NU-427E 6.1 Biosafety Cabinet Control 6.1.1 Overview The Biosafety Cabinet Control (BSCC) system is designed to service the control requirements of the NU-427E Biosafety Cabinet. The control system is a self-contained microprocessor driven module that will perform the following functions: Easy user interface via TOUCHLINK LCD •...
  • Page 21 6.1.2 Standby Mode When the BSC is not in use, the TOUCHLINK LCD screen will display Standby, the icons along the top and the time and date at the bottom as shown below. Any of the function icons, except the blower, that initiates Run Mode, may be turned on and off in standby mode.
  • Page 22 TOUCHLINK LCD screen will also display a description of the alarm in place of the Nuaire Logo along with alarm silence icon. Depending upon the alarm type, the BSC profile will also indicate in red the alarm present.
  • Page 23 6.1.5 Menu Icon The menu icon, when pressed will provide a list of menu items for various TouchLink functions 6.1.5.1 Setpoint/Limits This menu screen will indicate the Biosafety Cabinet airflow control setpoints, Access is restricted to service personnel requiring a service password to change values OM0298 September/2020 Page 23 of 102...
  • Page 24 6.1.5.2 Timer Settings: This menu screen indicates functional timer options. A description of each timer function is provided below. Pressing the time area on the menu will bring up a keypad for time entry for each function Timer Functions  Purge Timer: This timer controls how long the blower will run to purge the cabinet after the blower icon has been pressed to turn OFF the blower OM0298 September/2020...
  • Page 25  Outlet Timer: This timer controls how long the outlet remains on after the outlet icon has been pressed to turn on the outlet. If timer is zero, the outlet will stay on until turned OFF.  UV Light Timer: This timer controls how long the UV light will remain on after the UV light icon has been pressed to turn on the UV light.
  • Page 26  Auto Run Timers: This timer provides the ability to program on a daily basis the start and stop time of the cabinet. To start and stop the cabinets menus that both the blower and LED lights will automatically turn on and off together on a programmed schedule.
  • Page 27 6.1.5.3 Historical Performance: When press a historical performance text, the system displays downflow, inflow and Exhaust history  Downflow History: press downflow history, the system displays the week log data in graphical form of downflow versus days. OM0298 September/2020 Page 27 of 102...
  • Page 28  Inflow History: press downflow history, the system displays the week log data in graphical form of Inflow versus days  Exhaust History: press Exhaust history, the system displays the week log data in graphical form of exhaust versus days OM0298 September/2020 Page 28 of 102...
  • Page 29 6.1.5.4 Calibration/Service A password protected area used by certification or service personnel to set up and calibrate the cabinet for certification or commissioning. 6.1.5.5 Display Settings This menu item provides the ability to alter LCD screen display background contract and audible touch screen, the strings on this screen will be translated to the language configured on the unit OM0298 September/2020...
  • Page 30 This menu item provides the ability to alter display features and set date/time. Display Background colors of White, Green, Blue and Gray can be selected. Touch display tone audible feedback can turn on/off. Display brightness can be adjusted. Languages may be selected of English, Spanish, French and German. ...
  • Page 31 6.1.5.6 Change User Password This menu item provides the ability to change the user password from the default value of “1234”.  Set Password: Enter Old Password Set New Password  OM0298 September/2020 Page 31 of 102...
  • Page 32 Retype New Password  6.1.5.7 System Information This menu item provides the cabinet model number, serial number, and software revision OM0298 September/2020 Page 32 of 102...
  • Page 33 UV light turned on if installed.  NOTE: If night setback exhaust airflow is reduced by the Building Automation System (BAS) and not by the Nuaire Model NU-951-012 valve, it would still be recommended to use the contacts on the main control board to initiate the night setback option to display night setback active, inhibit exhaust alarms, fluorescent light and internal blower.

  • Page 34: Operating Guidelines

    6.2 Operating Guidelines The intent herein is to present general operational guidelines that will aid in the use of the Laminar Flow Biosafety Cabinet (LFBSC) to control airborne contaminants of low to moderate risk as stated in Technical Report No. FPS 56500000001 prepared by Dow Chemical U.S.A.
  • Page 35 6.2.3 Minimize Room Activity Activity in the room itself should be held to a minimum. Unnecessary activity may create disruptive air currents as well as interfere with the work of the operator. A person walking past the front of a cabinet can cause draft velocities up to 175 fpm (.89 m/s), which are sufficient to disrupt the air balance of the laminar flow cabinet.

  • Page 36: Operating Sequence

    6.3 Operating Sequence 6.3.1 Start Up Turn on cabinet blower and lights, check air intake and exhaust portals of the cabinet to make sure they are unobstructed. The electronic airflow control system will automatically control airflows to specified setpoints.  NOTE Some cabinets are equipped with ultraviolet (UV) lights.

  • Page 37: Ergonomics

    6.3.6 Terminal Purging & Wipe down Following completion of work, allow the cabinet to run for a 2-3 minute period without personnel activity to purge the cabinet. The decontamination of the interior surfaces should be repeated after removal of all materials, cultures, apparatuses, etc.
  • Page 38 Further information is available at the following: http://www.parrinst.com/wp- content/uploads/downloads/2011/07/Parr_Stainless-Steels-Corrosion-Info.pdf NOTE: Nuaire does not offer any product warranty with respect to cleaning material compatibility. USE AT YOUR OWN RISK! The information provided above is from raw material suppliers and known general source documents for use to develop application cleaning SOP’s.

  • Page 39: Hazardous Drug Decontamination Procedure

    6.6 Hazardous Drug Decontamination Procedures This procedure is intended to provide guidance following a spillage and/or periodic maintenance, testing or relocation of the cabinet. Additional guidance can be provided by the CETA document CAG-005-2007 found at the CETA website: www.CETAinternational.org. 6.6.1 Preparation Prior to beginning decontamination activity, personnel should wear proper personnel protection equipment (PPE)

  • Page 40: Decontamination

    7.0 General Maintenance All maintenance actions on this equipment must be performed by a qualified technician who is familiar with the proper maintenance CAUTION procedures required for this equipment. This includes both certification as well as repair. 7.1 Decontamination No maintenance should be performed on the interior of the LABGARD cabinet (area behind access panels) unless the cabinet has been microbiologically decontaminated, is known to biologically clean, or known to be chemically inert.

  • Page 41: Led Lamp Replacement

    (See section 6.6 for guidelines) Please consult with Nuaire, Inc. about any unique contamination problems. Normally, no preventive maintenance is required on the interior of the cabinet (i.e., the area behind the access panel containing the HEPA filters and motor (blower assembly).

  • Page 42: Hepa Filter/Motor Replacement

    "clean". Constant pressure spring-type clamps are used to hold the exhaust filter tightly in place to counteract seal relaxation, while the supply filter employs Nuaire's HEPEX pressure plenum. USE ONLY REPLACEMENT FILTERS OF THE SAME RATED FLOW AND SIZE AS ORIGINALLY INSTALLED, TO INSURE PROPER AIRFLOW BALANCE CAN BE ACHIEVED.
  • Page 43 Step 4: To remove the supply filter: • Unlatch the three filter clamps (In front of the supply HEPA filter) The clamps provide very high tension and may require mechanical assistance to unfasten. Keep fingers and hands clear when releasing! •...
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  • Page 45: Sliding Window Replacement & Adjustment

    7.3.2 Exhaust Filter Replacement Step 1: Remove exhaust filter access panel, which is held into position by 1/4-20 acorn nuts. Once the acorn nuts are removed, remove the panel. Step 2: Locate the external single point release bolt on the top right hand side of the cabinet. Use a 5/16-inch (8mm) wrench to release the exhaust filter rotating counter clockwise.
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  • Page 47: Airflow Control System Setup & Calibration

    7.5 Airflow Control System Setup and Calibration Failure to calibrate airflow to the specified requirements may result in CAUTION unsafe conditions of performance (i.e. product and/or personnel protection, noise and vibration) 7.5.1 General The operation of the NU-427 cabinet requires that the setup and calibration procedures be performed in order to certify or commission the cabinet for usage.
  • Page 48 7.5.2 Calibration/Service Menu The Calibration/Service menu provides a list of sub-menu items to accomplish all service tasks. Each sub-menu item will be described in the following sections For airflow calibration, only the first three sub-menu items are used in the calibration process 7.5.2.1 Cabinet Type/Motor Type The cabinet type can be verified in the control system and is factory set and shouldn’t require alteration.
  • Page 49  Note: If the BSC has a special downflow area (work zone), exhaust duct diameter size, or special work access opening window height, these must be entered into the control system to assure the correct display values. Press MENU to access these additional parameters. Select and SAVE appropriate size of each. OM0298 September/2020 Page 49 of 102...
  • Page 50 Press SET MOTOR TYPE to verify correct setting. Upon a MASTER RESET, the motor type is defaulted to DC ECM Single. Always verify motor type when verifying cabinet type. OM0298 September/2020 Page 50 of 102...
  • Page 51 7.5.2.2 Setpoints/Limits The airflow setpoints and alarm limits may also be verified or altered. Typically these default values are factory set based on the cabinet type, model, and size as previously discussed. However, they may be altered in special cases for modified cabinets. The setpoint establishes the airflow values that are to be maintained. The high/low limits establish the alarm boundaries from the nominal setpoint.
  • Page 52 Default values for NU-427-400E Default values for NU-427-600E • Downflow setpoint - .35 • Downflow setpoint - .35 • Downflow high limit - .39 • Downflow high limit - .39 • Downflow low limit - .30 • Downflow low limit - .30 •...
  • Page 53 The blower speed control system adjusts the cabinet's supply volume of airflow while customer supplied exhaust system controls the exhaust volume of airflow. Since it has been Nuaire's experience that the filters may not "load" evenly, both adjustments are necessary for proper cabinet performance.
  • Page 54 7.5.3.1 Exhaust Volume Calibration without the NU-951-012 Motorized Butterfly Valve Step 1: Activate power to the cabinet Turn on exhaust system. Access sensor setup menu. Step 2: Access calibrate downflow sensor menu and spot check a few downflow points to verify downflow is close to the desired setpoint of 70 fpm + 5 fpm (.35 m/s ±...
  • Page 55 Step 3: Now, access the calibrate exhaust sensor menu and measure inflow velocity using the recommended procedure found in Table 7.0 If necessary, adjust the exhaust system to achieve the correct exhaust volume. Use Table 7.1 to relate downflow and inflow volumes and corresponding average airflow velocities. It is always desirable to achieve airflow values that are set as close as possible to nominal.
  • Page 56 Step 4: Verify the operation of the manual mode pressure switch at this point. Lower the exhaust volume to 50 CFM (85 CMH) lower than the standard exhaust lower alarm limit. • Turn off motor/blower Block off Supply-air intake using cardboard. •...
  • Page 57 70fpm + 5 fpm. Adjust if necessary Step 3: Set damper position to 60° on the display. Nuaire recommends using the damper position at 60° to minimize static loss and maximum controllability of the system. However, THE DAMPER CAN RANGE FROM 35°...
  • Page 58 Step 4: Now, measure inflow velocity using the recommended procedure found in Table 7.0. If necessary, adjust the exhaust system and/or damper to achieve the correct inflow velocity. Use Table 7.1 to relate downflow and exhaust/inflow volumes and corresponding average airflow velocities.
  • Page 59 Step 5 :Verify the operation of the manual mode pressure switch at this point. Lower the exhaust volume to 50 CFM (85 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 •...
  • Page 60 Step 4: Press + or - button of BLOWER DUTY CYCLE to adjust blower speed. The objective of this spot check is to obtain the desired downflow average velocity as close as possible to the stated goal of 70 LFPM (.30 m/s). DON'T SPEND MORE THAN 5 MINUTES SPOT CHECKING.
  • Page 61 Note: If night setback exhaust airflow is reduced by the Building Automation System (BAS) and not by the Nuaire model NU-951-012 valve, this calibration procedure is not necessary. However, it would still be recommended to use the contacts on the main control board to initiate the night setback option to display night setback active, inhibit exhaust alarms, light and internal blower.
  • Page 62 When the Night Setback option ON the Night Setback icon will appear ON the display to turn night set back ON/OFF. Press home icon the save screen pop up, press save to enter selection. Step 3: Select NIGHT SETBACK Calibration At this point, the night setback is active and the butterfly valve will begin to close.

  • Page 63: Hepa Filter Leak Test

    7.6 HEPA Filter Leak Test In order to check filter and filter seal integrity, the HEPA filter media and seals must be directly accessible, by the measuring instrument. The challenge material (i.e. PAO) should be supplied under the center of the front grill for the supply filter and in the rear center of the work zone over the intake slots for the exhaust filter.

  • Page 64: Site Installation Assessment Tests

    The criteria used to evaluate the smoke patterns is the following: 1. The smoke inside the cabinet shall show smooth downward flow with no dead spots or reflux. 2. No smoke shall escape from inside the cabinet. 3. No smoke refluxes out of the cabinet once drawn in, nor does smoke billow over the work surface or penetrate onto it.
  • Page 65 Table 7.0 Recommended Measurement Methods for Cabinet Downflow & Inflow A. Downflow Measurement Instruments: TSI 8355 Thermo anemometer b. Procedure: Supply filter efflux is measured on a grid, in a horizontal plane defined by 4 inches (102mm) above the bottom edge of the window.
  • Page 66 The following are recommended minimum/maximum cabinet certification airflow setpoints per NSF Standard #49. Nuaire recommends, however, operation at the stated average flow, for ease of maintenance and annual certification. THE FOLLOWING EXHAUST FLOWS ARE FOR AN 8 INCH (203MM) WORK ACCESS OPENING...

  • Page 67: Main Control Board Description & Replacement

    7.10 Main Control Board Description & Replacement To access the main control board for fuse or board replacement, remove screws at each upper side of the control center and allow the control center to rotate down, resting on the safety straps. Now the main control board is exposed for service.
  • Page 68 7.10.4 Cabinet Reset The main control board has two software operating resets available for qualified service personnel. The two types are the following: Factory Reset - Resets setpoints and selected option settings. Factory reset should be used in the event the system memory develops an error in operation. Cabinet type, motor type, and calibration data will not be affected with this reset.
  • Page 69 Once the MASTER RESET icon is pressed, the display screen will remain the same for approximately a few seconds.. Once the reset process is complete the display screen will revert back to the Nuaire logo main menu. At this point the cabinet MUST be turned off to complete the process.

  • Page 70: Digital Airflow Sensor Description & Replacement

    7.11 Digital Airflow Sensor Description & Replacement 7.11.1 Downflow Velocity Sensor The airflow sensor function utilizes two thermistors that provide a constant current source. One thermistor is a reference that uses a very low current source. The other thermistor is the airflow measurer that uses a very high current source.
  • Page 71 Step 1: NOTE ALL ERROR MESSAGES. Error message will appear in place if the Nuaire logo with “Active Alarms” and the alarm type below. Step 2: VERIFY ERROR MESSAGES. Error messages can be verified by cleaning the error function by either turning the blower or the cabinet on and off.
  • Page 72 8.1 Error Message Troubleshooting Guide Error Message Indicator Correction Sliding window is above its Window Alarm Verify standard working height and window micro switch standard working height or micro (Window High) operation. switch is not operating properly. Airflow Alarm Downflow airflow fell below its Red Downflow Arrow Re-certify cabinet to proper airflow setpoints.
  • Page 73 Error Message Indicator Correction EX Sensor Error! Replace airflow sensor if required. Touch Link Display User Touch area’s of display do not Align w/ Calibrate display in adjust display brightness screen Interface icons Indicates a temporary microprocessor Clean alarm a see it reoccurs, check line voltage to control board, Run Time Failure issue replace control board...
  • Page 74 8.2.2 Calibration/Service Menu The Calibration/Service menu provides a list of sub-menu items to accomplish all service tasks. Each sub-menu item will be described in the following sections. 8.2.2.1 Blower Options The blower options menu allows A QUALIFIED TECHNICIAN to run the cabinet in manual mode. This means with no controls or alarms activated.
  • Page 75  Manual Blower control: When the manual blower control is on, the downflow and inflow displays will indicate nominal setpoints. Airflow adjustments can be made in manual mode by going into airflow calibration and adjusting the blower duty cycle. The blower duty cycle will remain constant in manual mode. The display will also indicate the manual control is activated.
  • Page 76  Password Reset Night Setback Calibration (see calibration section) The night set back calibration is performed within the calibration mode after the inflow and downflow calibration procedure is complete. Exhaust Damper Set up Exhaust Airflow Control This parameter allows for the selection of time, programmable from 30 to 240 seconds determining how often the exhaust controller updates the control signal to the automatic damper (i.e.
  • Page 77 Exhaust Damper Position This parameter allows for the selection to disable the exhaust control/alarm and select a desired damper position when the blower is turned off. Normally when the blower is turned off the exhaust control and alarm function remains active in the B1/B2 configuration. However, if the cabinet is tied into the exhaust blower circuit it is desirable to turn off the exhaust control and alarm function when the blower switch is turned off.
  • Page 78 Remote Override Damper Open This parameter allows or the NU-951 damper to open during a remote override contact closure. Normally the NU-951 damper function will close during a remote override contact closure. However, this option allows the opposite damper function 8.2.3 Service The service setup menu allows a QUALIFIED TECHNICIAN to configure, calibrate and obtain functional service data.
  • Page 79 Run Times This parameter allows the service technician to view, alter, or reset both UV light and blower motor run times.  Select desired run time parameter from menu.  UV Run time: This time shows how many hours the UV light has logged ON. Reset the time when replacing the V ...
  • Page 80 Certification Date This parameter allows the service technician to view and update the current certification date. The certification date also has a feature to indicate an advance notice that re-certification is due. Press DUE to enter the certification required time period screen. Select the desired interval of certification required, i.e. No Reminder, 6, 12, 18, or 24 months.
  • Page 81 Filter Status Data This parameter allows the service technician to set the filter status data used to predict filter life availability. Filter status is based on maximum RPM minus the starting RPM (entered by technician) then scaled to current RPM to determine filter percentage availability.
  • Page 82 8.2.8 Option Set Up The option set up menu allows A QUALIFIED TECHNICIAN to configure several different optional parameters per the menu below. Each parameter sub-menu will be described as well as the display will the default conditions as shown. Alarm Silence : This parameter allows for the selection of the alarm silence key function.
  • Page 83 Downflow Alarm Time: This parameter allows for the selection of time to determine how many continuous seconds of an alarm condition occurs before activating an audible and visual alarm. The time is displayed in seconds with a programmable range from 2 to 12 seconds. OM0298 September/2020 Page 83 of 102...
  • Page 84 Interlock Features All interlocks are enable/disabled by a user through the display  UV Window Interlock: This parameter allows for the selection of the window closed switch to be interlocked with the UV light option. When UV window interlock is on, the window must be closed for the UV light to operate.
  • Page 85  Fan Relay interlock: This parameter allows for the selection of the fan relay interlock operation. When the fans relay interlock is on, and the blower switch is pending or blue, the fan relay will be off or not energized. If the fan relay interlock is off and the blower switch is pending or blue, the fan relay will be on or energized.
  • Page 86  Blower Outlet Interlock: This parameter allows for the selection of the outlet to be interlocked with the blower. When the blower outlet interlock is on, the outlet operations will be interlocked to the blower. When the blower outlet interlock is off, the outlet can be turned on at any time. Auxiliary Features This menu item provides the access to aux relay function and accessory outlet functions ...
  • Page 87 8.2.9 Diagnostics The diagnostics menu allows A QUALIFIED TECHNICIAN to test and read the system’s blower/sensor diagnostics, window diagnostics and general I/O diagnostics. Each of these has its own menu screen to display the control system. Select menu screen as desired. OM0298 September/2020 Page 87 of 102...
  • Page 88  Blower/Sensor Diagnostics Test outputs allow a service technician to exercise these output functions. Pressing TOGGLE will turn on and off the functions. Press UP and DOWN to select the test output desired. Use the display icons to turn on/off each function of blower, UV light, light andoutlet. ...

  • Page 89: Airflow Sensor Performance Verification

    When the downflow sensor is uncovered, the motor/blower voltage should decrease and airflow readings should be within the calibration range. If the motor/blower voltage does not change, an airflow sensor problem could exist. Please consult with Nuaire Technical Service. OM0298 September/2020...
  • Page 90 9.0 Remote Contacts The NU-427E has several contact closures for remote sensing of various functions. 9.1 Fan Relay The fan relay contacts are dual normally open contact closure outputs which are activated whenever the blower is turned on. Contact ratings are 250 VAC maximum at 2 Amps. 9.2 Alarm Relay The alarm relay contacts are dual normally open contact closure outputs which are activated whenever an airflow alarm condition occurs.

  • Page 91: Ultraviolet Light

    10.0 Optional Equipment 10.1 Ultraviolet Light Ultraviolet light will injure your eyes. Avoid direct viewing at all times. CAUTION Personnel should not be present when ultraviolet lamp is on. 10.1.1 Overview The germicidal ultraviolet is primarily intended for the destruction of bacteria and other microorganisms in the air or on directly exposed surfaces.
  • Page 92 Energies Required to Destroy Some Microorganisms by Ultraviolet Radiations (e) Microwatt Microwatt Mold Spores seconds Protozoa seconds per cm/2 per cm/2 Penicillum roqueforti 26,400E Paramecium 200,000(a) Penicillium expansum 22,000 Penicillium digitiatum 88,000 Nematode Eggs 40,000(b) Aspergillus glaucus 88,000 Aspergillus flavus 99,000 Algae 22,000(c)
  • Page 93 11.0 Electrical/Environmental Requirements 11.1 Electrical (Supply voltage fluctuations not to exceed +/- 10%) *NU-427-400E 230VAC, 50/60Hz, 1 Phase, 10 Amps *NU-427-600E 230VAC, 50/ 60Hz, 1 Phase, 11 Amps 11.2 Operational Performance (for indoor use only) Environment Temperature Range: 60°F-85°F (15°C - 30°C) Environment Humidity: Maximum relative humidity 80% for temperatures up to 31°C decreasing linearly to 50% relative humidity at 40°C.
  • Page 94 12.0 Disposal and Recycle Cabinets that are no longer in use and are ready for disposal contain reusable materials. ALL components with the exception of the HEPA filters may be disposed and/or recycled after they are known to be properly disinfected. Note: Follow all local, state and federal guidelines for disposal of HEPA filter solid waste.
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This manual is also suitable for:

Nu-427-400eNu-427-600e

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