Leak Checking For Unit And Field-Installed Piping - Liebert PX018 Installer's/User's Manual

NOTICE
Risk of no-flow condition. Can cause equipment damage.
Do not leave the water/coolant fluid-supply circuit in a no-flow condition. Idle fluid allows the
collection of sediment that prevents the formation of a protective oxide layer on the inside of
tubes. Keep unit switched On and water/coolant fluid-supply circuit system operating
continuously.
These guidelines apply to field leak checking and fluid requirements for field piping systems, including
Liebert chilled water, hot water, condenser (water or glycol), GLYCOOL™ and drycooler circuits.
Refer to the appropriate piping general-arrangement schematics for your system for the recommended,
field-installed hardware such as shut-off valves. See 5 on page 29.
• Equipment damage and personal injury can result from improper piping installation, leak
checking, fluid chemistry and fluid maintenance.
• Follow local piping codes, safety codes.
• Qualified personnel must install and inspect system piping.
• Contact a local water consultant regarding water quality, corrosion protection and freeze
protection requirements.
• Install manual shut-off valves at the supply and return line to each indoor unit and drycooler to
permit routine service and emergency isolation of the unit.
• Install a monitored, fluid-detection system that is wired to activate the automatic closure of
field-installed coolant-fluid supply and return shut-off valves to reduce the amount of coolant
fluid leakage and consequential equipment and building damage. The shut-off valves must be
sized to close-off against the maximum coolant-fluid system pressure in case of a catastrophic
fluid leak.
• Install the factory-provided Y-strainer on the water/glycol supply to water/glycol or GLYCOOL
units. The strainer is needed to prevent particles in the water from entering the unit's heat
exchanger.

5.3.1 Leak Checking for Unit and Field-installed Piping

The fluid systems in the Liebert PDX/PCW are factory-checked for leaks and may be shipped with a
nitrogen 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 (207 kPa) and tightness of the unit should be verified by pressure decay over time,
(<2 psig/hour [13.8 kPa/hour]) or sensing a tracer gas with suitable instrumentation. Dry seals in fluid
valves and pumps may not hold a high gas pressure.
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