NuAire LabGard ES NU-543-300S, Operation And Maintenance Manual

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OM0239 Page 15 of 72
April 2021
5.2.1 Base Stand Assembly
The base stand is typically shipped knocked down in a separate carton and is assembled per drawing BCD-16385
Once assembled; place the stand in approximate position (ready for cabinet placement onto the base stand). Now
lift the cabinet on top of the base stand 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 the desired location.
5.2.2 Leveling
Using a level placed on the work tray, first adjust the leg levelers end to end and then front to back. The NSF
approved leg levelers provide a

3/4" (20mm) adjustment.
5.2.3 Bench Installation (BCD-16882)
If providing a bench (i.e. laboratory casework/countertop) installation for
the cabinet; the bench shall be rated to support 4 times the weight of the
cabinet to meet requirements of IEC 61010-1.
Place the cabinet on the bench with approximately a 2" (51mm) overhang clearance for installation of the drain
valve. Place the cabinet in desired location and using RTV caulk, 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 the drain valve is desired, (NOTE, CHECK WITH YOUR SAFETY PERSONNEL FOR REGULATORY REQUIREMENTS (i.e.
locking type) OF DRAIN VALVE INSTALLATION) 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 caulk as above.
5.2.4 Gas Service
NuAire doesn't recommend the use of natural gas within the LFBSC, but if gas service is determined to be
necessary for the application, appropriate safety measures must take place. All NuAire LFBSC'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
ADDITIONAL EMERGENCY GAS MANUAL SHUTOFF VALVE BE PLACED JUST OUTSIDE THE LFBSC ON THE GAS SUPPLY
LINE, BEFORE THE REQUIRED GAS SOLENOID VALVE.
The gas valve, when this option is installed, will only operate or flow gas when the cabinet blower is on and no
alarm is present. An integral cabinet/gas solenoid valve must be installed on the gas supply line for this purpose.
Note: some countries (i.e. Germany) only allow certain types of certified valves to be used for natural
gas (i.e. Germany DVGW Certified). Verify requirements per Local, State and Federal codes/laws.
As previously stated NuAire doesn't recommend the use of natural gas within the LFBSC and ASSUMES NO
RESPONSIBILITY FOR ITS USE. USE AT YOUR OWN RISK. The Bunsen burner flame within the LFBSC not only
contributes to heat build-up; it 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
!

CAUTION
!