Eppendorf CO2 Back-up System - Manual (Page 21)

Operation
New Brunswick CO2 Back-up System
English (EN)
21
7 Operation
7.1 Turning the control unit on
1. Plug the power cord into the mains.
The green Power On LED illuminates.
2. Turn the System On switch to the on position.
The control unit will beep. The alarm may sound if the control unit has not been switched on for some
time. In this case, the alarm will continue to sound until the battery has been charged or replaced with a
fully charged battery.
The
Temp Warning light will illuminate, indicating the temperature in the freezer is warmer than the
temperature set on the Back-up Unit.
7.2 Testing the solenoid valve
1. Unplug freezer.
2. Close the door or lid of freezer.
3. Turn the System On switch on.
4. Turn CO
2
supply on.
The Valve Open LED will pulse on and off indicating gas injection.
5. Push the Valve Test button and hold for no more than 2 seconds at a time.
The Valve Open light will illuminate and CO
2
will be injected into the freezer for however long you push
the Valve Test button.
6. Release the Valve Test button.
The front panel LED's will illuminate in sequence, in a clockwise direction.
7. Confirm that gas has been flowing by determining the presence of frozen condensation around the
injector and on the freezer's shelf.
7.3 Testing door switch
1. Carefully open the door or lid of the freezer 5 cm (about 2 in).
CO
2
should not be injected into freezer.
WARNING! High pressure
 Do not keep Valve open for more than 2 seconds at a time.
 Allow 15 seconds before pushing Valve Test button again.
WARNING! Extremely cold gas
You may be burned by cold gas.
 Open door or lid of freezer with caution
 The door switch is NOT designed as a safety interlock.