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.
s
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
2
, then -
65°C is the coldest BUS set point that can be used (if the cabinet set point
is -75°C or colder).
s
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
2
or LN
2
back-up system operation, alarms and battery voltage.
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).
6-6
8600 Series
Thermo Scientific
Section 6
Factory Installed Options
Set Optional BUS Set
Point (continued)
Disconnect Fitting
Assembly, Transfer Hose
1 2
3
9-volt battery
Green LED
Program selection and
calibration buttons
1
2
3
Figure 6-7.
Recorder Details
Test the BUS
Operation
Chart Recorder
Summary of Contents for Forma 8600 Series
Page 55: ...8600 Series 8 1 Thermo Scientific Section 8 Spare Parts...
Page 75: ...8600 Series 9 1 Thermo Scientific Section 9 Refrigeration Schematics...
Page 76: ...9 2 8600 Series Thermo Scientific Section 9 Refrigeration Schematics...
Page 77: ...8600 Series 9 3 Thermo Scientific Section 9 Refrigeration Schematics...
Page 78: ...9 4 8600 Series Thermo Scientific Section 9 Refrigeration Schematics...
Page 79: ...8600 Series 9 5 Thermo Scientific Section 9 Refrigeration Schematics...
Page 80: ...9 6 8600 Series Thermo Scientific Section 9 Refrigeration Schematics...
Page 81: ...8600 Series 10 1 Thermo Scientific Section 10 Electrical Schematics...
Page 82: ...10 2 8600 Series Thermo Scientific Section 10 Electrical Schematics...
Page 83: ...8600 Series 10 3 Thermo Scientific Section 10 Electrical Schematics...
Page 84: ...10 4 8600 Series Thermo Scientific Section 10 Electrical Schematics...
Page 85: ...8600 Series 10 5 Thermo Scientific Section 10 Electrical Schematics...
Page 86: ...10 6 8600 Series Thermo Scientific Section 10 Electrical Schematics...
Page 87: ...8600 Series 10 7 Thermo Scientific Section 10 Electrical Schematics...
Page 88: ...10 8 8600 Series Thermo Scientific Section 10 Electrical Schematics...
Page 89: ...8600 Series 10 9 Thermo Scientific Section 10 Electrical Schematics...
Page 90: ...10 10 8600 Series Thermo Scientific Section 10 Electrical Schematics...
Page 91: ...8600 Series 10 11 Thermo Scientific Section 10 Electrical Schematics...
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