Eppendorf CO2 Back-up System - Manual (Page 22)

Operation
New Brunswick CO2 Back-up System
English (EN)
22
2. Check for frozen condensation around injector and freezer shelf. Frozen condensation indicates CO
2
Back-up System is working.
3. Push Valve Test button.
Gas should not be injected into freezer.
Valve Open light should not illuminate.
7.4 Testing back-up system operation
1. Turn off CO
2
Back-up System with the System On switch.
2. Turn on freezer.
3. Set freezer to to desired temperature and wait until temperature is reached.
4. Set Temp Set dial on the control unit to 10 °C higher than the freezer's temperature.
5. Flip System On switch on.
The Temperature Warning LED and Valve Open LED remain off. This is because the temperature of
freezer is lower than temperature set on Temp Set dial.
6. Change Temp Set dial to 10 °C lower than freezer's temperature .
The Temperature Warning LED will turn on indicating that the temperature in the freezer is below the
temperature set on the dial of the control unit.
The
Valve Open LED will flash on and off indicating gas is being injected into the freezer.
7. Unplug CO
2
Back-up System from mains.
The Power On LED will turn off. The device is now operating on battery back-up. There should be no
change in temperature in the freezer while CO
2
Back-up System is in operation.
8. Plug the CO
2
Back-up System back into mains.
9. Reset the Temp Set dial to the desired temperature at which the device should turn on in the event of
power failure.
10. Verify that the gas supply is still on and the freezer is operating.
The Temp Warning should be off indicating that the freezer temperature is below the temperature set
on the Temp Set knob.
The Valve Open LED should be off indicating that gas is not being injected into the freezer.
The Power On LED should be on indicating that the CO
2
Back-up System is plugged into the mains.
7.5 Battery back-up
The CO
2
Back-up System contains a rechargeable battery in case of power failure.
If the CO
2
Back-up System is plugged into the mains, and the Power On LED is illuminated, the battery is
being charged.
If the external power supply fails, the back-up battery will power the CO
2
Back-up System for up to 48
hours, depending upon ambient conditions. The lower the ambient temperature, the longer the back-up
battery will run.