5.2.1 Leak Checking for Unit and Field-installed Piping
The fluid systems in the Liebert® CW are factory-checked for leaks and may be shipped with holding
charge. At installation, check all fluid circuits for leaks.
NOTE: We recommend isolating the unit with field-installed shutoff valves during leak checking of
field-installed piping. When the units are included in a leak test, use of fluid for pressure testing is
recommended. When pressurized gas is used for leak testing the unit, the maximum recommended
pressure is 30 psig (207kPa) and tightness of the unit should be verified by pressure decay over time,
(<2 psig/hour [13.8kPa/hour]) or sensing a tracer gas with suitable instrumentation. Dry seals in fluid
valves and pumps may not hold a high gas pressure.
5 Piping Requirements
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