Thermo Scientific Revco ULT-1390-10-A, Operating Manual

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4-2 Revco CxF Thermo Scientific
Section 4
Alarms
This 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 along with the "HS SYST FAIL" message in the LED message
center.
When multiple alarm conditions occur, active messages are displayed in the
message center one at a time, updating at 5 second intervals. Pressing
Silence during multiple alarms causes all active alarms to be silenced and to
ring back in 15 minutes.
An internal communication failure has occurred with the micro board.
During this alarm, the compressor(s) attempt to run continuously.
However, with this type of failure, freezer operation becomes
undependable.
Communication between the micro board and the display board has been
lost. Under this condition, the visual alarm flashes along with dashes in the
temperature display (----). Contact Technical Services.
High Stage System Failure
Alarm (-86C units only)
Multiple Alarms
Micro Board Failure
Alarm
Lost Communication