Emerson Liebert ICOM-DO Installation Manual download pdf (Page 34)

Piping

General Guidelines

• Equipment damage and personal injury can result from improper piping installation, leak check-

ing, 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 protec-

tion requirements.

• Install manual shutoff valves at the supply and return line to each indoor unit and drycooler to

permit routine service and emergency isolation of the unit.

NOTICE

Risk of frozen fluids. Can cause equipment damage and building damage.

Freezing system fluids can rupture piping. Complete system drain-down cannot be ensured.

When the field piping or unit may be exposed to freezing temperatures, charge the system

with the proper percentage of glycol and water for the coldest design ambient.

Automotive antifreeze is unacceptable and must NOT be used in any glycol fluid system.

NOTICE

Risk of corrosion. Can cause equipment damage.

Read and follow individual unit installation instructions for precautions regarding fluid

system design, material selection and use of field-provided devices. Liebert systems contain

iron and copper alloys that require appropriate corrosion protection.

Contact a local water consultant regarding water quality, corrosion and freeze protection

requirements.

Water chemistry varies greatly by location, as do the required additives, called inhibitors,

that reduce the corrosive effect of the fluids on the piping systems and components. The

chemistry of the water used must be considered, because water from some sources may

contain corrosive elements that reduce the effectiveness of the inhibited formulation.

Preferably, surface waters that are classified as soft and are low in chloride and sulfate ion

content should be employed. Proper inhibitor maintenance must be performed in order to

prevent corrosion of the system. Consult glycol manufacturer for testing and maintenance of

inhibitors.

Commercial ethylene glycol (Union Carbide Ucartherm, Dow Chemical Dowtherm SR-1 and

Texaco E.G. Heat Transfer Fluid 100), when pure, is generally less corrosive to the common

metals of construction than water itself. It will, however, assume the corrosivity of the water

from which it is prepared and may become increasingly corrosive with use if not properly

inhibited.

NOTICE

Risk of oxide layer formation. Can cause equipment damage.

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 system pump operating.

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.

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Emerson Liebert ICOM-DO Installation Manual Page 34

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