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Test BUS Operation
Clean Vent Stack
Disconnect Fitting Asm.
and Transfer Hose
Chart Recorder
Thermo Scientific
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 the 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.
Routinely check the vent stack for frost or ice build-up. The type of frost
that forms in the vent stack is generally very soft and may be easily
removed with a bristle brush or soft cloth. If ice build-up has occurred, a
complete defrost may occasionally be required. See Section 4 for freezer
defrost instructions.
To disconnect the freezer back-up from the gas supply:
1. Close the supply valve.
2. Depress the test button on the BUS 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).
The following section describes the set up and operation of the optional
chart recorder.
Figure 5-7. Recorder Details
Section 5
Factory Installed Options
Model 900 Series
5-7
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