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Step #4
Re-Check the Cryochiller for Leaks.
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Connect the trace gas cylinder to the manifolds enter hose. Open both manifold valves and the
cylinder valve to pressurize the unit to 10 to 20 psig (70
–
140 kPa). Close both manifold valves and
the trace gas cylinder valve. Remove the gas cylinder from the center hose.
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• Attach the dry nitrogen to the manifold’s center hose. Open both manifold valves and the cylinder
valve and increase pressure in the unit to 250 to 350 psig.
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Check the entire system (including lines and in-chamber cryo coil) for leaks with the halogen leak
detector. Insure that there are no leaks anywhere in the system.
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If possible hold pressure for 24 to 48 hours to confirm system is not leaking
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Closing hand valves on front of unit, the Cryochiller can be isolated from the coil output side. Doing
this can help confirm if the leak is in the Cryochiller or the attached line set(s) and coil(s).
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