ULT Freezer 5-1
VWR International
Section 5
Factory Installed Options
Note
Before installation of BUS components, make sure the power to the
freezer is disconnected, the battery switch is turned off and the 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.
1. Locate the mounting hole for installing the injection tee assembly. See
Figure 5-1.
Note
Cover open end of injection assembly with tape to keep insulation
from entering nipple.
s
2. Slide 3/8” flatwasher over open end of nipple.
3. Insert covered end of injection assembly through exterior hole.
4. Remove the tape covering the end of the nipple and install the 1/8”
NPT brass tee on the open end of the nipple. Place Permagum sealant
between the brass tee and the interior top.
Back Up System (BUS)
- P/N 1950445, 1950447
Install Injection Assembly
Figure 5-1.
Mounting location
Summary of Contents for 5700 Series
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