Piping Materials And Handling - LG MULTI F Installation Manual

F
MULTI
F
MULTI MAX

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 contami-
nate the interior with dust, moisture, etc. See Table 21 for care of piping.
Principles
No moisture should be inside the piping.
- Significant hydrolysis of refrigerant oil.
Problems
Caused - Refrigerant oil degradation.
- Poor insulation of the compressor.
- System does not operate properly.
- EEVs, capillary tubes are clogged.
- Remove moisture from the piping.
Solutions
- 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.
GENERAL INSTALLATION GUIDELINES
Table 21: Three Principles of Refrigerant Piping.
Dry
No dust should be inside the piping.
Moisture
- Poor insulation of the compressor.
- System does not operate properly.
- EEVs and capillary tubes become
- Remove dust from the piping.
- Piping ends should remain capped until
- Connect piping properly at the side of
- Remove caps only after the piping is cut
- Retain the cap on the piping when
Due to our policy of continuous product innovation, some specifications may change without notification.
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Piping Materials and Handling
Clean
Dust
- Refrigerant oil degradation.
clogged.
connections are complete.
the unit.
and burrs are removed.
passing it through walls, etc.
Figure 39: Keep Piping Capped While Storing.
Airtight
No leaks should occur.
Leaks
- Refrigerant gas leaks / shortages.
- Refrigerant oil degradation.
- Poor insulation of the compressor.
- System does not operate properly.
- Test system for air tightness.
- Perform brazing procedures 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
tested to 550 psig.
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