CryoTel® GT User’s Manual Version 6 P a g e | 5
II. Precautions (Dos and Don’ts)
Although the CryoTel
®
GT is mechanically robust, it can be damaged if not handled properly when in
operation or when removing from the packaging. The handling and operational Dos and Don’ts are
listed below. Refer to the diagram of the CryoTel
®
GT in Figure 2.
CRITICAL! – Do not operate the cryocooler without adequate cooling at the heat rejection site.
Overheating the cryocooler will cause permanent damage.
DON’T
Pick up the cryocooler by the cold finger
Set the cryocooler on the cold tip.
Allow the cold finger to be dented. The slightest dent will render the unit inoperable.
Drill holes, or in any other way puncture, or attempt to modify, the pressure vessel.
Operate the unit without proper cooling. Heat must be removed from the copper heat rejection
area of the cryocooler. If the cooler is provided with external cooling fins, air must be forced
over the fins and the flow path should not be obstructed.
Puncture or otherwise damage the copper service tube.
Subject the electrical feedthroughs to mechanical stress; i.e. axial or radial movements, axial
loads, blows, or the like.
Mount the cooler by suspending it from the balance absorber mounting bolt.
Apply clamping pressure to the pressure vessel.
Rigidly attach the absorber stud to “ground.” Instead, let the cooler “float” via a rubber bushing
or other means of articulation.
Remove the protective cover on the cold weld on the end of the copper service tube. Do not
subject the cover to blows.
Control power to the cryocooler by making or breaking the power leads between the controller
and the cryocooler.
Use an external, automatic, closed loop control system which attempts to control the cryocooler
operation by varying the set point settings in the cryocooler controller.
DO
Check with Sunpower before making any modifications to the cryocooler
Note that if the controller is installed in an enclosure, cooling must be provided.
If the cooler is operating in a laboratory test mode with heaters providing the thermal load to
the cold tip, interlocks should be provided so that the heater cannot operate unless the
cryocooler is running. This will prevent accidental overheating of the cold tip.
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