Envirco BSC - Manual (Page 25)

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No power in internal outlet (c) ”Outlet” button on control board is off.
(d) Problem with units on operational panel or wires.
(e) Overloaded protection on outlet wire is tripped or fuse
has been blown.
5.5Maintenance notes
During maintenance, power supply must be turned off before pulling out power plugs. Users
are only allowed to replace UV lamp or fluorescent tubes, while other components should not
be removed. The maintenance of this equipment should only be performed by people who are
trained by Envirco If you need to order parts, you can contact our Technical Services
Department. Be sure to indicate the type and number of the Biological Safety Cabinet.
VI
、Installation requiring connection to an external exhaust system
Note: For installations where the exhaust HEPA filters of a Biological Safety Cabinet
are to be connected to an external building exhaust system, it must be a 100%
exhaust system
.
6.1Canopy/thimble connection
(a)Refer to Figure 11 for typical arrangement. The canopy or thimble type connection should
provide a constant exhaust load from the laboratory, regardless of whether the cabinet is
working or not. A duct volume of approximately 58 CFMgreater than the exhaust of the
cabinet is required; the exhaust of this cabinet is 264-282 CFM.
(b)This type of connection can be used when the cabinet is vented into a common exhaust
system.
(c) The opening of the canopy should be checked with a smoke stick to ensure that the
internal air turbulence does not cause outward air leakage.
(d) To ensure that the cabinet is not used without the remote exhaust fan operating, the
building exhaust fan should be interlocked to the outlet used to power the Biological Safety
Cabinet. An alternative method is to use a sail switch or similar device located in the
building exhaust system.
(e)A damper may be required in the exhaust line to correctly set the pull on the canopy.
(f)Balancing should be carried out by qualified personnel.Envirco can supply the exhaust
transition/monitor for coupling to the exhaust duct. Each exhaust transition/monitor
includes an alarm monitor system with a low and high flow alarm.
6.2 Hard connection