Configure Optional Bus (Back-Up System); Set Optional Bus Set Point - Thermo Scientific 5900 Series User Manual

Section 5
Factory Installed Options
Configure Optional BUS
(Back-Up System)
Set Optional BUS Set
5-6 Model 900 and 5900 Series
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 "cO2" or
"Ln2" for selection.
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 to
RUN mode after 5 minutes.
The optional back up system is designed to inject CO
freezer compartment if the temperature rises above back up system set
Point
point. To set the BUS set point:
1. Press the Mode key until the Set Temperature and Backup indicators
light.
2. Press the up or down arrow key until the desired BUS set point is
displayed.
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 to
RUN mode after 5 minutes.
Warning Changing the operating temperature set point can affect the BUS
set point. The BUS set point will self-adjust to maintain a temperature of
at least 10°C above the operating temperature set point.
Note The BUS set point can not be set any colder than the high
temperature alarm set point. (See Section 1, Set High Temperature
Alarm). If the back-up system is installed with CO
coldest BUS set point that can be used (if the cabinet set point is -75°C or
s
colder).
or CO supply. To select the
2 2
or LN into the
2 2
s
, then -65°C is the
2
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