Operation
Thermo Scientific Cryopgenic Storage Freezers
Installation and Operation Manual
17
6.4.3 Operation
To activate the optional backup system, complete the following steps:
1. Push the Power Switch to the ON position. The digital temperature
display window shows the current cabinet temperature.
2. Press and hold the Push to Set button to display the setpoint
temperature in the digital temperature display window.
3. Use a small screwdriver to rotate the Setpoint Adjust screw until the
correct backup operating temperature shows in the display window. The
backup system setpoint should be at least 5°C warmer than the warm
alarm setpoint. For example, if your control setpoint is 150°C and your
warm alarm setpoint is 140°C, the backup system setpoint should be no
colder than 135°C.
Note:
The temperature shown in the display window is accurate to ±1°C.
The backup system can run for a minimum of eight hours on a fully charged
battery.
Note:
You must push the Power Switch to the ON position in order to activate
the backup system.
6.4.4 System Status Lights
In addition to the backup control system, the built-in backup system
includes main control panel system status lights. These lights are only
available when the backup system is installed.
•
The Supply On Indicator lights when the backup system is operating on
battery power.
•
The Backup System Battery Low Indicator lights when the backup
system battery charge is low. The built-in battery charger recharges the
battery to full charge when power is restored to the system.
Note:
Since rechargeable batteries degrade over time, the battery should be
replaced after approximately one or two years.
