Bus Control Panel - Thermo Scientific 5900 Series User Manual

BUS Control Panel

Thermo Scientific
The following section describes the configuration and operation of the
BUS.
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.
Backup System
Power
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 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.
Caution The back-up system is designed to inject CO
unlikely event of back-up system failure, the back-up system will activate
and allow CO or LN
2
s
off.
s
.
2
s
s
Low Battery Solenoid Engaged
to flow until stopped manually or is manually shut
2
Section 5
Factory Installed Options
tank is adjusted to
2
Press to test
or CO into the
2 2
s
or LN . In the
2 2
Model 900 and 5900 Series
2
5-5