Thermo Scientific Harris Ultra-Low Temperature Freezers
Installation and Operation
7
6.3 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 set point
temperature in the digital temperature display window.
3. Use a small screwdriver to rotate the Set Point Adjust screw
until the correct backup operating temperature shows in the
display window. The recommended set point is 10 to 15
°
C
above normal cabinet temperature.
Note:
The temperature shown in the display window is
accurate to
±
1
°
C.
The backup system can run for about eight hours on battery
power.
WARNING!
You must push the Power Switch to the
ON position in order to activate the backup system.
6.4 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 three
years.
•
The Backup System Empty Indicator lights when the standby
CO
2
or LN
2
bottle is empty.
Figure 5. Location of CO
2
Connection Site,
Chest Models Only
24.75"
2.375"
CO
2
Inlet Conn.
Copper Tubing
Factory Supplied
0.25" O.D.
MACHINE COMPARTMENT
REAR VIEW