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Factory Installed Options
Section 6
Descriptions of freezer options which can only be factory installed follow.
Back-Up System
Warning Before installation of BUS components, make sure the power to
the freezer is disconnected, the battery switch is turned off (O) and the
(BUS 195875, 195877)
freezer has warmed to ambient temperature.
s
The built-in BUS (back up system) will keep the freezer chamber
temperature below the critical level in the event of a power or equipment
failure. If power to the freezer fails, or temperature increases to the back up
alarm set point, the BUS injects liquefied gas into the chamber to keep the
chamber temperature within the specified range.
The BUS operates on an internal 12-volt, rechargeable battery which is
kept charged during normal operation by the integral battery charger.
Figure 6-1. Injection
VWR International
Model 5600 Series
6-1
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