Emerson VERTIV Liebert Mini-Mate2 Series User Manual page 92

• 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.
NOTE: Follow all proper brazing practices including a dry nitrogen purge to maintain system
cleanliness.
2.5.1 Piping for Elevation Differences between PFH and Evaporator
System sizes affect the maximum equivalent piping lengths and maximum relative elevation differences
between evaporator and condensing unit mounting locations. See Figure 2.5 on page 8 for requirements.
Traps in refrigerant piping are required when elevation differences exist between evaporator and
condensing unit mounting locations. See the following diagram for requirements. Figure 2.6 on page 9
Table 2.6 on page 17 should be used when traps are required with field-fabricated piping assemblies, to
calculate equivalent pipe lengths to determine if installation will comply with the requirements in
length and condenser elevation relative to evaporator
Vertiv | Liebert PFH Installer/User Guide |
on the next page.
Pipe
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