NuAire LabGard NU-560-400, Operation & Maintenance Manual

Page: 39 / 103

OM0295
Rev 2 September 2020 Page 39 of 103
7.0 General Maintenance
All maintenance actions on this equipment must be performed by a qualified
technician who is familiar with the proper maintenance 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® ES cabinet (area behind access panels) unless the
cabinet has been microbiologically decontaminated, is known to biologically clean, or known to be chemically inert. Surface
disinfection is performed as specified in the cleaning procedures.
Hazardous Gases! Personal Protection Equipment Required.
A disinfection using formaldehyde must be performed in accordance with the specifications of
NSF/ANSI 49, Annex G.
This procedure presents considerable risks and must be performed only by specially trained and
authorized service personnel in accordance with applicable safety regulations.
The formaldehyde is vaporized within the tightly sealed sample chamber. The quantity of the applied
formaldehyde depends on the volume of the sample chamber in the safety cabinet that is to be
disinfected. The formaldehyde evaporates immediately after reaching its boiling point; the minimum
reaction time is
6 hours. Therefore, the formaldehyde should be neutralized after the specified reaction time by
vaporizing ammonium bicarbonate.
Flammable Hazard!
Paraformaldehyde is flammable. The auto-ignition temperature of paraformaldehyde is 300 ° C (572° F).
Chemical Hazard!
Paraformaldehyde in reaction with hydrogen chloride will form BCME which is a hazardous chemical.
When using paraformaldehyde, all residues of hydrogen chloride in the work chamber of the cabinet
must be removed.
If microbiological decontamination is necessary, use the following procedure:
1. Remove screws at each upper side of the control center and allow the control center to rotate down, resting on
the safety straps. Remove control center by disconnecting safety straps and moving control center off the slip
hinges.
2. Remove the front decorative panel via top/front fasteners.
3. Remove left and right window faring’s via fasteners.
4. Remove armrest via fasteners.
5. Prepare decontamination equipment. Reference decontamination procedure, per NSF/ANSI 49, Annex G, using the
following chart to calculate chemical requirements.
CAUTION
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CAUTION
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CAUTION
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CAUTION
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