Labconco FreeZone 6 Liter Benchtop Freeze Dry Systems 77520 Series - Manual (Page 29)

25
Chapter 4: Using Your Freeze Dryer
Product Service: Domestic 1-800-522-7658, International 816-333-8811
Alarms
A number of unusual events may occur during a lyophilization
procedure that can adversely effect the operation of the Freeze
Dryer. If an event occurs, the alarm indicator will flash and the
beeper will sound.
The beeper will automatically mute itself after one minute. The
specific alarm can be identified by pressing MENU. Pressing
MENU multiple times will display multiple alarms if they have
occurred. The following “out of specification” conditions will
initiate an alarm:
Power Failure
If a power failure occurs during a Freeze Dry process, the vacuum
control valve will allow air to bleed into the Freeze Dryer System.
If the failure is of a short duration and the collector does not warm
up excessively, when power is restored the Freeze Dryer will
restart and resume operation of the refrigeration and vacuum
systems. If the power failure lasts for a longer duration and the
collector warms above safe limits, when the power is restored, the
Freeze Dryer will not automatically restart. This prevents melted
sample from being drawn into the collector and prevents liquid
from being sucked into the vacuum pump.
When power is restored, the alarm indicator will flash and the
alarm beeper will sound. When the MENU button is pressed the
display will show
Press and hold SELECT for five seconds until the error message is
cleared from the display.
POWER FAIL
HOLD SELECT TO CLEAR IT