Labconco PURICARE Procedure Station Models 34812xx - Manual (Page 44)

Page 44 of 197
Type A2 Optional Exhaust System Connections
Unless specially modified by Labconco at the customer’s request, all Type A2 Purifier
Logic Series Biosafety Cabinets are shipped to recirculate their HEPA filtered exhaust air
back into the laboratory.
Certain applications such as working with odorous products or volatile toxic materials
will require the connection of the Purifier to an exhaust system.
Note: The canopy connection, also referred to as a thimble or air gap connection,
allows single or multiple biohazard cabinets to be connected to an exhaust system.
During operation, the exhaust system draws all of the cabinet’s exhaust air, plus a
volume of room air (through the slots in the canopy) into the exhaust duct. Canopy
connections function as a “shock absorber” allowing the system to function properly
during changes in room air pressure.
For information on selecting a canopy connection, go to Section 9: Logic Accessories
.
Type B2 Exhaust System Connections
Note: The LogicTotal Exhaust Biosafety Cabinet is designed to be connected to an
appropriate exhaust system. Do not attempt to operate it when it is not connected to
an appropriate exhaust system.
The exhaust connection is a sealed exhaust system from the top of the cabinet to the
remote blower. The exhaust systems should be dedicated to a single cabinet. The
cabinet is equipped with an exhaust flow alarm, such that an alarm sounds, and the
cabinet blower shuts off in the event of insufficient exhaust flow.
Exhaust System Requirements
NOTE: THE EXHAUST BLOWER CANNOT RUN AT ITS NOMINAL FLOW RATE WITH THE
SASH COMPLETELY CLOSED. IF YOU CHOOSE TO CLOSE THE SASH COMPLETELY TO
USE THE UV LIGHT FOR SURFACE DISINFECTION, THEN THE EXHAUST BLOWER MUST
BE SHUT OFF, OR ITS FLOW RATE REDUCED 90% OR MORE FOR PROPER OPERATION.
THE LOGIC CONTROL BOARD HAS DRY CONTACTS THAT CAN BE CONFIGURED TO
SIGNAL THE EXHAUST BLOWER TO TURN ON WHEN THE LOGIC BLOWER IS ON. FOR
FURTHER INFORMATION, CONTACT LABCONCO’S PRODUCT SERVICE DEPARTMENT.
AS AN ALTERNATIVE, A REMOTE ELECTRICAL SWITCH FOR THE EXHAUST BLOWER
CAN BE INSTALLED NEAR THE LOGIC
.
The cabinet exhaust stack is sized to accept 10-inch stainless steel ductwork. The
exhaust system’s blower should be sized to handle the exhaust volume of each cabinet,
as shown in the Type B2 QuickCharts. The exhaust system must maintain a static
pressure equal to or greater than the system pressure, plus 1.4 inches of water for the
Logic cabinet. In order to get the maximum life out of the cabinet’s exhaust filter, the
system needs to be able to operate at an additional 2.0 inches of vacuum, compared to
the initial total system pressure.