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Section 6
Factory Installed Options
Set Optional BUS Setpoint
Test the BUS
Clean the Vent Stack
6-6
Model 5600 Series
The optional back up system is designed to inject CO
freezer compartment if the temperature rises above back up system set
point. To set the BUS set point:
1. Press the Mode key until the Settings indicator lights.
2. Press the right arrow until "BACKUP = -XX" is displayed in the
message center.
3. Press the up or down arrow key until the desired BUS set point is
displayed.
4. Press Enter to save the setting.
5. Press the Mode key until the Run indicator lights or press the right or
left arrow to go to next or previous parameter.
If no control keys are pressed, the freezer automatically returns to RUN
mode after 5 minutes.
Caution The BUS setpoint cannot be set any colder than the high
temperature alarm setpoint (see Section 1). If the back-up system is
installed with CO
, then -65°C is the coldest BUS setpoint that can be
2
used (if the cabinet setpoint is -75°C or colder).
Changing the operating temperature setpoint can affect the BUS setpoint.
The BUS setpoint will self-adjust to maintain a temperature of at least
10°C above the operating temperature setpoint.
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 5 for freezer
defrost instructions.
or LN
into the
2
2
s
VWR International
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