Installation & Commissioning Manual:
Neos 100S, 20X, 30S, 35X, 40X, 50X
62-11165 Rev D
®
22
Evacuation, Leak Checking, and Refrigerant Charging
The presence of moisture in a refrigeration system can have many undesirable
effects, such as sludge formation, “freezing up” of metering devices, and metal
corrosion caused by acid formation. Make every effort to keep the system dry.
After performing a pressure leak test, evacuate and dehydrate the system.
Essential tools to properly evacuate and
dehydrate a system include a good
vacuum pump (5 cfm=8m
3
H displacement,
P/N 07-00176-01) and a good vacuum
gauge indicator (P/N 07-00414-00).
NOTE: a compound gauge is NOT recommended
Keep the ambient temperature above 60°F (16°C) to speed evaporation of moisture. If the
ambient is lower than 60°F (16°C), ice may form before moisture removal is complete. If
necessary, heat lamps or alternate sources may be used to raise system temperature.
The unit is shipped with a dry nitrogen holding charge. Remove the nitrogen, and then
evacuate and dehydrate the system by connecting three hoses (do not use standard
service hoses) to the vacuum pump and refrigeration unit. Connect an evacuation manifold
with evacuation hoses only to the vacuum gauges and refrigerant recovery system.
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