3-2
ULT Freezer
VWR International
Section 3
Alarms
The "high stage system failure" condition is created when the high stage
compressor and fans run for 30 minutes and are not capable of cooling the
interstage heat exchanger to the proper temperature. Under this condition,
the high stage compressor and fans will turn off after 30 minutes and an
audible and visual alarm will occur. The audible alarm can be silenced and
will ring back every 15 minutes.
The microprocessor in Model 5700 series freezers continually scans all
probes including the control probe, heat exchanger probe and condenser
probe to ensure that they are operating properly. Should an error be
detected, the "Probe Failure" alarm will occur as described in Section 3.1
above. If an error is detected with the control probe, the high and low
stage compressors will run continuously. As a result, the cabinet
temperature will decrease until it reaches the lowest temperature that the
refrigeration system can maintain. If an error is detected with the heat
exchanger probe, the freezer will cycle properly at its temperature set point
using a 5 minute step start between the high and low stage compressors. If
an error is detected with the condenser probe, there is no impact on the
performance of the freezer; however, the hot condenser alarm may also
occur. Contact the VWR Service department or your local distributor.
Probe Failure Alarm
High Stage System
Failure
Содержание 5700 Series
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