Emerson Figure i manual Piping Considerations

Installation

2.5Piping Considerations

The Liebert Mini-Mate2, Liebert DataMate and the 3-ton Liebert Challenger 3000 split system units are designed with quick-connect fittings and are factory-charged to proper refrigerant levels. This permits connecting units without brazing inside critical spaces. These split systems require two refrigerant lines—an insulated copper suction line and a copper liquid line—between the evaporator and condensing units. The 8-ton Liebert Mini-Mate2 split system units will require four refrigerant lines between the evaporator and condensing units. Each refrigeration circuit will need one insulated copper suction line and one copper liquid line.

Two methods exist for installing the copper suction and liquid lines:

•Using optional pre-charged line sets (for 1- to 3.5-ton R-407C model units only).

•Using optional Sweat Adapter Kit(s) and hard piping between units.

NOTICE

Risk of improper handling of refrigerant. Can cause environmental damage and violation of environmental regulations.

Refrigerant must handled in accordance with all national, regional and local codes.

NOTE

Proper safety equipment and proper refrigeration tools are required in working with R-407C refrigerant. Check unit serial tag for correct refrigerant type before topping off or recharging a system.

NOTE

Refrigerant R-407C uses a POE (polyol ester) lubricant. The R-407C refrigerant must be introduced and charged from the cylinder only as a liquid.

NOTE

When installing field piping, care must be taken to protect all refrigerant lines from the atmosphere, especially when using refrigerants with POE oils. Do not allow the piping to stand open to air for more than 15 minutes. Units designed for R-407C have a compressor which contains POE oil that is very hygroscopic; that is, it quickly absorbs water from the air. The longer the compressor piping is left open to air, the harder it will be to fully evacuate. If left open too long, the POE oil may need to be replaced before achieving the required vacuum level.

NOTE

Complete all piping and evacuate lines before connecting quick connects when using an optional sweat adapter kit and field installed hard piping.

Follow all proper brazing practices including a dry nitrogen purge to maintain system cleanliness.

2.5.1Piping for Elevation Differences between PFH and Evaporator

System sizes affect the maximum equivalent piping lengths and maximum relative elevation differ- ences between evaporator and condensing unit mounting locations. See Table 5 for requirements.

Traps in refrigerant piping are required when elevation differences exist between evaporator and con- densing unit mounting locations. See Figure 12 for requirements. Table 6 should be used when traps are required with field-fabricated piping assemblies, to calculate equivalent pipe lengths to determine if installation will comply with Table 5 requirements.

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