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6/21 57-02611 / 101628 ©2021, Refrigerated Solutions Group™. All rights reserved. 10
NOTICE
Be sure solenoid valves are open before beginning evacuation and leak check.
V. Leak Check
When all refrigeration line connections have been made, the complete system, including factory connections,
should be leak checked.
Add the proper refrigerant to 60 PSIG, then boost to 175 PSIG with dry nitrogen. Leak check all joints with an
electronic leak detector or a halide torch. If leaks are found, relieve the pressure, and make repairs as necessary
and recheck.
VI. Evacuation, Dehydration and Start-Up
A vacuum of 500 microns or less must be pulled to properly dehydrate the system. This requires a two-stage
vacuum pump with an electronic vacuum indicator.
***DO NOT USE THE SYSTEM COMPRESSOR AS A VACUUM PUMP. ***
***DO NOT OPERATE COMPRESSOR WHILE SYSTEM IS IN A VACUUM. ***
Evacuation Procedure
A. Open all condensing unit service valves and relieve system pressure. Also, open any line valves installed
in the system and energize all solenoid valves to facilitate evacuation.
B. Connect the vacuum pump to the high and low sides of the system using 1/4" or larger cop per lines or
1/4" ID hoses with high vacuum designation.
C. Leaks or moisture will be indicated if the system pressure rises when the vacuum line is closed off.
D. Pull a vacuum of 1500 microns, close vacuum line and “break” vacuum to 3 PSIG, maximum, with
refrigerant to be used in the system.
E. Repeat step D.
F. A final vacuum of 250 microns should be pulled before charging. When 250 microns is reached, close
vacuum line and charge through high side, with proper refrigerant to the level of 2-1/2 lbs. per ton of
refrigeration.
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