Labconco FreeZone Triad Freeze Dry System 74000 Series - Manual (Page 22)

Chapter 4: Operating Instructions
Product Service 816-333-8811 or 1-800-522-7658 18
Manual Control Operation
The manual operation has three selectable modes: Pre-Freeze, In-Flask and
controlled shelf temperature. The Pre-Freeze setting allows the shelf
temperature to freeze samples below –55°C obtaining “Max Cold”
temperature of approximately –75°C. The In-Flask setting is used to freeze
dry pre-frozen samples when using only the sample valves on the left side of
the unit. There is no shelf temperature control in this mode. When using the
controlled shelf set point temperature setting, the shelf temperature will
maintain the set point selected between –55°C to 50°C. This mode should be
used when freeze drying samples on the shelf. A flask can also be added to
the sample valves in this mode.
(1) Turn the Power Switch ON. The display will become active.
(2) Push the DISPLAY button until the MANUAL indicator lights.
This will cause the manual display screen to be shown with the
previously entered set point temperature or operational mode.
The temperature units are displayed in the units (°F or °C)
selected in the Set Up.
The temperature may be set to control the shelf anywhere from
+50°C to –55°C in 1°C increments. To pre-freeze samples below
–55°C set temperature to “Pre-Freeze.” To freeze dry samples
using the manifold sample valves change set point temperature to:
“In-flask.”
(3) If the set point or operating mode needs to be changed, press the
INCREASE or DECREASE button until the desired set point
temperature or mode is displayed.
(4) Press ENTER. If ENTER is not pressed within 10 seconds, the set
point will revert to the previously entered parameter.
(5) Press MODE button until the manual indicator lights.
(6) Press RUN/STOP button. The RUN/STOP indicator will light
and the refrigeration system and/or heater will operate.
(7) If vacuum is required press VAC Button. Do not run vacuum with
unfrozen samples in chamber.
(8) To change the set point temperature in the middle of a run, repeat
steps 2, 3 and 4. The system will adjust to the new temperature
set point.
(9) To monitor system operation, press DISPLAY until the Monitor
indicator lights. The display will simultaneously show shelf
(SHLF) temperature, collector (COL) temperature and the sample
(SAMP) temperature. If the sample probe is not plugged into its
jack, the SAMP temperature display will show “- - -”. If in the
Pre-freeze mode the (COL) display will show“- - -”. If in the In-
flask mode the (SHLF) the display will show“- - -”.
SET POINT TEMP –30°C