Chapter 4: Using Your Freeze Dryer
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Freeze Dryer Controls
The control panel for the Freeze Dryer is shown below with a description about its
function.
1. LCD Display – Displays system operating parameters, set-up parameters and
alarm messages.
2. Menu Switch – This switch is used to change the display from operating
system parameters to set-up parameters.
3. Select Switch – Used to select set-up parameters.
4. Vacuum Switch – Used to start or stop the vacuum pump when operating in manual
start-up mode.
5. Vacuum Indicator – This green LED indicates that power is being supplied to the
vacuum pump receptacle on the back of the Freeze Dryer.
6. Manual Refrigeration Switch – Used to start only the refrigeration module.
7. Manual Operation Indicator – When lit, the green LED indicates the Freeze Dryer is
being controlled manually by the operator. Each function must be started by the
operator.
8. Auto Mode Switch – Used to start or stop the refrigeration and the Auto Mode process.
9. Auto Mode Indicator – When lit, the green LED indicates that the Freeze Dryer is in
Auto Mode. In this mode, the vacuum pump will start when the collector temperature
reaches –40°C.
10. Vacuum Graph Display – This display indicates the relative system vacuum level. The
highest LED indicates that the vacuum level is above 2.0 mBar. The indicators will
sequence down when the vacuum level reaches 2.0, 1.0, 0.8, 0.6, 0.45, 0.12 mBar. The
lower green LED flashes when the system vacuum level is 0.45 to 0.12 mBar and
illuminates steadily below 0.133 mBar.
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