LG Art Cool Premier LA120HYV1 Installation Manual page 21

Tightening the Flare Nuts
Table 5: Tightening Torque for Flare Nuts.
Pipe size (Inches O.D.)
1/4Ø
3/8Ø
1/2Ø
5/8Ø
1. When connecting the flare nuts, coat the flare (inside and outside) with polyvinyl ether (PVE)
refrigeration oil only.
2. Initially hand tighten the flare nuts using three (3) or four (4) turns.
3. To finish tightening the flare nuts, use both a torque wrench and a backup wrench.
4. After all the piping has been connected and the caps have been tightened, check for refrigerant gas leaks.
Do not use polyolyester (POE) or any other type of mineral oil as a thread lubricant. These lubricants are not compatible with PVE oil
used in this system and create oil sludge leading to equipment damage and system malfunction.
Loosening the Flare Nuts
Always use two (2) wrenches to loosen the flare nuts.
Piping Materials and Handling
Pipes used for the refrigerant piping system must include the specified thickness, and the
interior must be clean.
Do not bend or damage the pipes while handling and storing. Take care not to contaminate
the interior of pipes with dust, moisture, etc. See Table 6 for care of piping.
Table 6: Three Principles of Refrigerant 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.
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
GENERAL INSTALLATION GUIDELINES
Piping Preparation/Piping Materials and Handling
Tightening torque (ft-lbs)
13.9 - 18
24.5 - 30.3
39.7 - 47.7
45.5 - 59.2
Dry
No dust should be inside the piping.
Moisture
- Refrigerant oil degradation.
- Poor insulation of the compressor.
- System does not operate properly.
- EEVs and capillary tubes become
clogged.
- 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.
Due to our policy of continuous product innovation, some specifications may change without notification.
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Width of the flare (A [inches])
1/8
1/8
1/8
1/16
Figure 19: Keep Piping Capped While Storing
Clean
Dust
Figure 18: Tightening the Flare Nuts
Union
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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