Polycold Cryochiller
Installation
Installation and Operation Manual
Check the Refrigerant Line and Cryosurface for Leaks
Brooks Automation
214072 Revision B
4-27
Check the Refrigerant Line and Cryosurface for Leaks
About Leak Check
The leak gas used must be dry with a dew point of -80 C or less.
Helium leak checking the refrigerant line and cryosurface is an acceptable alternative to the procedure
specified below if helium leak check equipment and trained helium leak check operators are available.
If helium is used as a leak check medium, only use helium while the compressor is off and ensure that
the pressure in the line and cryosurface during this test does not exceed the lowest refrigerant pres-
Item Description
Electrical Category
Type 1 – Equipment is fully de-energized
Tool or material
Cylinder of refrigerant gas R-134a
Cylinder of dry nitrogen gas (very low dew point of -80 C) with a regulator
Service manifold gauge set with three hoses (manifold)
Electronic halogen leak detector with a leak sensitivity of at least 0.40 ounces
(11 g) per year
Leak detector soap
Inspection mirror
1/4 inch ratchet valve wrench
7/16 inch open-end wrench
9/16 inch open-end wrench
5/8 inch open-end wrench
15/16 inch open-end wrench
1 inch deep socket or open end or crow foot wrench
1 1/16 inch deep socket or open end wrench
1 5/16 inch deep socket or open end wrench
Adjustable wrenches as required
Reference Documents
Service Procedure, Zero Line Loss, p/n 185307
Service Procedure, Evacuation-Recovery, p/n 185308
Service Procedure, Brazing Specifications, p/n 185305
Chemical Hazard
Failure to have a qualified refrigeration technician do all refrigera-
tion work could result in system damage or personal injury.
•
Contact a qualified refrigeration technician to perform all refriger-
ant work.
