VWR VWRC0386A, Instruction Manual

Page: 45 / 94

Section 7
Factory Installed Options
Options are available as factory or field installed, depending on the
territory. Please contact your local VWR representative for details. Refer
to the table in Appendix A-5 for the available field-installed options.
Note Before installation of BUS components, make sure the power to the
freezer is disconnected, the battery switch is turned off (O) and the freezer
has warmed to ambient temperature.
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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.
1. Locate the mounting hole for
installing the injection tee assembly. See
Figure 7-1.
Note Cover open end of injection
assembly with tape to keep insulation
from entering the nipple.
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2. Slide 3/8” flatwasher over open end
of nipple.
3. Insert the covered end of the injection assembly through exterior hole.
Chest Freezer 7-1 VWR International
Back Up System (BUS)
Install Injection Assembly
Mounting hole
for injection tee
Figure 7-1. Mounting location