Emerson Liebert ICOM-DO Installation Manual download pdf (Page 35)

Refrigerant Connections

7.0 REFRIGERANT CONNECTIONS

NOTICE

Risk of oil contamination with water. Can cause equipment damage.

The piping must not be open to the atmosphere for extended periods because the Liebert CRV

requires POE (polyol ester) oil. POE oil absorbs water at a much faster rate when exposed to

air than previously used oils. Because water is the enemy of a reliable refrigeration system,

extreme care must be used when opening systems during installation or service. If water is

absorbed into the POE oil, it will not be easily removed and will not be removed through the

normal evacuation process. If the oil is too wet, it may require an oil change. POE oils also

have a property that makes them act as a solvent in a refrigeration system. Maintaining

system cleanliness is extremely important because the oil will tend to bring any foreign

matter back to the compressor.

The Liebert CRV can be connected to a condenser through either the top or bottom of the unit. The

unit is piped for connections at the top of the unit as shown in Figure 26, with provision for connec-

tion through the bottom of the unit.

Connecting through the bottom of the unit requires cutting the liquid and suction lines as shown in

Figure 27. Cutting these lines disconnects the top connections from the rest of the refrigeration system.

Air-cooled units are shipped with a holding charge of nitrogen.

7.1 Piping Guidelines—Air-Cooled Units

• Indoor unit ships with a nitrogen holding charge; do not vent the evaporator until all refrigerant

piping is in place, ready for connection to the unit and condenser

• Use copper piping with high temperature brazed joints

• Isolate piping from building using vibration-isolating supports

• Refer to Figures 30 and 31 for piping sizes

• Refer to condenser installation manual for charging information

• Install traps on hot gas (discharge) lines at the base of vertical risers and every 15 feet (4.6m) of

vertical rise.

• See Table 9 for the allowable elevation difference between the condenser and the Liebert CRV.

• Consult factory if piping run exceeds 150 feet (46m) equivalent length

• Keep piping clean and dry, especially on units with R-410A refrigerant

• Avoid piping runs through noise-sensitive areas

• Do not run piping directly in front of airstream of any air conditioner

• Refrigerant oil – do not mix oil types

Refer to ASHRAE Refrigeration Handbook for general, good-practice refrigeration piping.

WARNING

Risk of explosive discharge from high-pressure refrigerant. Can cause injury or death.

This unit contains fluids and/or gases under high pressure.

Relieve pressure before working with piping.

WARNING

Risk of refrigerant system rupture or explosion from over pressurization. Can cause

equipment damage, injury or death.

If a pressure relief device is not provided with the condenser unit, the system installer must

provide and install a discharge pressure relief valve rated for a maximum of 609psig (42bar)

in the high side refrigerant circuit. Do not install a shutoff valve between the compressor and

the field installed relief valve.

One or more additional pressure relief valves are required downstream of all field-installed

isolation valves. Do not isolate any refrigerant circuits from overpressurization protection.

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Emerson Liebert ICOM-DO Installation Manual Page 35

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