Polycold Cryochiller Installation
Installation and Operation Manual Check the Refrigerant Line and Cryosurface for Leaks
Brooks Automation
214072 Revision B 4-31
Correct a Leak in a Parker UltraSeal Compatible or Cajon VCR Coupling
1. Cover the lower access hole with a finger and apply leak detector soap to the higher
access hole. Observe the higher access hole for at least 2 minutes.
If a bubble forms, verify that the coupling is tightened to within specification.
2. Check for leak again.
• If the leak is repaired, return to the previous procedure.
• If the coupling still leaks, reassemble the coupling as follows:
a. Open the discharge valve on the manifold to release the gas in the refrigerant line and
cryosurface.
b. Perform the Zero Line Loss Procedure and then disassemble the coupling. See Appendix
G: Zero Line Loss Procedure on page 12-13.
c. Check the coupling's sealing surfaces to make sure they are not scratched or damaged.
d. Re-assemble the coupling using a new o-ring or gasket and following the instructions found
at Install Parker UltraSeal Compatible Couplings (Standard Fitting) on page 4-24 or Install
Cajon VCR Couplings (Optional Fitting) on page 4-25.
e. Leak check the coupling again.
• If the coupling still leaks, contact Brooks Automation Service.
• If the leak is repaired, return to the previous procedure.
3. Return to the Check Refrigerant Lines procedure.
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