VWR VWRC0386A, Instruction Manual

Page: 52 / 94

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. Preventive Maintenance - Monthly maintenance action to check CO
2
or LN
2
back-up system operation, and battery voltage.
- Check for fault codes on the BUS probe per Table 7-1. Also verify
solenoid operation by performing a Press-To-Test.
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).
The following sections describes the set up and operation of the optional
chart recorder.
7-8 Chest Freezer VWR International
Section 7
Factory Installed Options
Disconnect Fitting
Assembly, Transfer Hose
Test the BUS Operation
Chart Recorder
1 2
3
9-volt battery
Green LED
Program selection and
calibration buttons
1 2
3
Figure 7-7. Recorder Details