Emerson Liebert CRV User Manual page 40

Leak Checking of Unit and Field Piping
Liebert unit fluid systems are factory-checked for leaks and may be shipped with a nitrogen holding
charge. Liebert unit fluid circuits should be checked for leaks at installation as described below.
NOTE
During leak checking of field-installed piping, Emerson recommends that the unit be isolated
using field-installed shutoff valves. When the Liebert units are included in a leak test, use of
fluid for pressure testing is recommended. When pressurized gas is used for leak testing the
Liebert unit, the maximum recommended pressure is 30 psig (2 bars) and tightness of the unit
should be verified by pressure decay over time, (<2 psig/hour [0.3 bars/hour]) or sensing a
tracer gas with suitable instrumentation. Dry seals in fluid valves and pumps may not hold a
high gas pressure.
® ™
Liebert CRV 30
Piping