Piping
Liebert
®
SRC
™
User Manual 38
5.1.3 Loosening Flare Nuts
Always use 2 wrenches to loosen the flare nuts.
5.2 Piping Materials and Handling
Pipes used for the refrigerant piping system must include the specified thickness, and the interior must be
clean.
While handling and storing, do not bend or damage the pipes, and take care not to contaminate the interior
with dust, moisture, etc. See Table 5-3 for care of piping.
Figure 5-4 Keep piping capped while storing
Table 5-3 Three principles of refrigerant piping
Dry Clean Airtight
Principles No moisture should be inside the
piping.
No dust should be inside the
piping.
No leaks should occur.
Problems
Caused
• Significant hydrolysis of refrigerant
oil.
• Refrigerant oil degradation.
• Poor insulation of the compressor.
• System does not operate properly.
• EEVs, capillary tubes are clogged.
• Refrigerant oil degradation.
• Poor insulation of the
compressor.
• System does not operate
properly.
• EEVs and capillary tubes
become clogged.
• Refrigerant gas leaks/shortages.
• Refrigerant oil degradation.
• Poor insulation of the
compressor.
• System does not operate
properly.
Solutions • Remove moisture from the piping.
• Piping ends should remain capped
until connections are complete.
• Do not install piping on a rainy day.
• Connect piping properly at the
unit’s side.
• Remove caps only after the piping
is cut, the burrs are removed, and
after passing the piping through
the walls.
• Evacuate system to a minimum of
500 microns and ensure the
vacuum holds at that level for 24
hours.
• Remove dust from the piping.
• Piping ends should remain
capped until connections are
complete.
• Connect piping properly at the
side of the unit.
• Remove caps only after the
piping is cut and burrs are
removed.
• Retain the cap on the piping
when passing it through walls,
etc.
• Test system for air-tightness.
• Perform brazing proc3edures
that comply with all applicable
standards.
• Perform flaring procedures that
comply with all applicable
standards.
• Perform flanging procedures that
comply with all applicable
standards.
• Ensure that refrigerant lines are
pressure-test to 550 psig.
-
Dust
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