Cryomech CPA289C, Installation And Operation Manual

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Routine Maintenance
8-6
8. Evacuate to 50 microns.
9. Isolate the vacuum pump and add 50 psig (3.4 bar) of helium.
10. Vent the helium.
11. Repeat steps 8, 9 and 10 until the vacuum level reaches 25 microns or less.
12. Pressurize the charging line to the service access with the system helium pressure
specified in Section 5.
13. Slowly open the service valve to add helium to the system.

The final helium charge in the system helium pressure specified in Section 5.
CAUTION
No more than 5 psig (0.34 bar) of gas should be added per minute to prevent improper oil migration
within the system. If such contamination occurs, factory service will be required.
14. Close the service valve.
15. Remove the service Aeroquip from the service access.
8.7 Cleaning
8.7.1 Helium compressor package and cold head
The helium compressor package and cold head require no cleaning other than wiping the
outside of each if it becomes dusty or dirty.
CAUTION
Excluding the designated water cooling circuit, never allow water to contact any of the components
of the system. Exposing the system to water will void the warranty.
8.7.2 Aeroquip couplings
WARNING
Never remove an Aeroquip coupling from the helium flex lines, cold head, adsorber, or helium
compressor package without first relieving the helium charge. Pressure in any of the components
can cause the coupling to become a projectile that may cause injury.
If operated in a clean environment, the only parts of the system that are likely to require
cleaning are the Aeroquip couplings.
If an Aeroquip coupling needs cleaning:

Blow off the coupling with clean, dry compressed air.

Solvents should never be used.
o
If any grease or oil gets on the Aeroquip coupling, contact Cryomech, Inc.