VWR 5700 Series, Operating And Maintenance Manual

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Power - indicates the unit has AC power.
Low Battery - battery charge is low. The battery needs replaced or
recharged.
Solenoid Engaged - BUS has opened the solenoid so it can inject gas
(CO2 or LN2).
Press-To-Test - Activates the solenoid and injects LN
2
or CO
2
into the
freezer chamber as long as the button is depressed. The solenoid engaged
indicator should light. If the Low Battery indicator lights during the test,
replace the BUS battery.
Note The solenoid will not engage if lid is open.
s
The optional BUS can be configured for LN
2
or CO
2
supply.
To select the supply type:
1. Press the Mode key until the Backup indicator lights.
2. Press the up or down arrow key. The display will show ‘cO2’ for CO2
selection and ‘Ln2’ for LN2 selection.
3. Press Enter to save the setting.
4. Press the Mode key until the Run indicator lights for Run mode
If no control keys are pressed, the freezer will automatically return to Run
mode after 5 minutes.
ULT Freezer 5-5 VWR International
Section 5
Factory Installed Options
Figure 5-6. BUS Control Panel
Configure Optional BUS
(Back Up System)
BUS Control Panel
(continued)