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Section 6
Factory Installed Options
Set Optional BUS Set
Point (continued)
Test the BUS Operation
Disconnect Fitting
Assembly, Transfer Hose
Chart Recorder
Figure 6-7. Recorder Details
6-6
HFC Series
Warning Changing operating temp set point can affect BUS set point.
BUS set point self adjusts to maintain a temp of at least 10°C above the
operating temp set point.
Note The BUS set point cannot be set any colder than the high
temperature alarm set point. (See Section 1 - Setting the High
Temperature Alarm). If the back-up system is installed with CO
65°C is the coldest BUS set point that can be used (if the cabinet set point
is -75°C or colder).
After the freezer has stabilized and both batteries are fully charged, the
BUS can be tested to verify proper operation.
1. Disconnect the AC power to the freezer by turning power switch off.
2. As the freezer warms up, verify the BUS injects at the desired
temperature. Displayed temperature may vary by a few degrees from
inject temperature due to the differences in probe locations.
3. Recommended Maintenance - Monthly maintenance action to check
CO
or LN
2
2
To disconnect the freezer back-up from the gas supply:
1. Close the supply valve.
2. Depress the test button on the Back-Up System control box to remove
the gas from the line.
3. Slowly disconnect the fitting assembly from the supply (in the event
that any gas remains in the line).
3
1 2
s
s
back-up system operation, alarms and battery voltage.
Program selection and
calibration buttons
Green LED
, then -
2
9-volt battery
3
1 2
Thermo Scientific
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