Bus Operation And Maintenance; Bus Control Panel; Configure The Optional Bus (Back-Up System) - Thermo Scientific 700 Series Operating And Maintenance Manual

BUS Operation and
Maintenance

BUS Control Panel

Configure the Optional
BUS (Back-Up System)
Thermo Fisher Scientific
Warning When activated, this unit injects liquid nitrogen or carbon
dioxide. Liquid nitrogen can cause serious freezing (frostbite) if it comes in
contact with unprotected skin or eyes. Nitrogen suppresses oxygen levels
and may cause suffocation if area is not well ventilated. Refer to Appendix
A for the proper handling of liquid LN
Caution Make sure the pressure relief valve on any LN
30 PSI maximum blow-off.
Warning Carbon dioxide gas suppresses oxygen levels and may cause
suffocation if area is not well ventilated. Refer to "Handling Liquid CO
in Appendix B of this manual.
ackup System
ower Low Battery
Figure 5-6. 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 Solenoid will not engage if door is open.
The optional BUS can be configured for LN
supply type:
1. Press the Mode key until the Backup indicator lights.
2. Press the up or down arrow key. The display will show OP1 for CO
selection and OP2 for LN
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.
. ▲
2
▲
▲
Solenoid Engaged ress to test
▲
or CO
2
selection.
2
Section 5
Factory Options
tank is adjusted to
2
"
2
2
or CO into the
2 2
supply. To select the
2
2
Model 700 Series 5-5