Thermo Scientific Revco ULT1790-10-A Operating Manual page 45

BUS Control Panel
(continued)
Configure Optional Back Up
System (BUS)
Set Optional BUS Set
Thermo Scientific
Backup System
Power
Figure 6-6. BUS Control Panel
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 (CO
or LN ).
2
Press-To-Test - Activates the solenoid and injects LN
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.
Caution The back-up system is designed to inject CO
unlikely event of a back-up system probe failure, the back-up system will
activate and allow CO
manually shut off.
The optional BUS can be configured for LN
Configuration contains instructions for setting the BUS type.
The optional back up system is designed to inject CO
freezer compartment if the temperature rises above back up system set
Point
point. To set the BUS set point:
1. Press the Mode key until the Settings indicator lights.
2. Press right arrow until "BACKUP = -XX" displays in message center.
3. Press up or down arrow key until desired BUS set point is displayed.
4. Press Enter to save the setting.
5. Press the Mode key until the Run indicator lights, or press the right or
left arrow to go to the next or previous parameter.
If no control keys are pressed, the freezer will automatically return to
RUN mode after 5 minutes.
Low Battery Solenoid Engaged
or LN to flow until the supply is depleted or is
2 2
s
Factory Installed Options
Press to test
or CO into the
2 2
s
or LN . In the
2 2
or CO supply. Section 3 -
2 2
or LN into the
2 2
Revco CxF
Section 6
2
6-5