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Tightening Flare Nuts
1. When connecting the flare nuts, coat the flare (inside and outside) with polyvinyl ether (PVE) refrigeration oil only.
Note:
•
Do not use polyolyester (POE) or any other type of mineral oil as a lubricant. These lubricants are not compat-
ible with PVE oil used in this system and create oil sludge leading to equipment damage and system malfunction..
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
Loosening Flare Nuts
Always use two (2) wrenches to loosen flare nuts.
Pipe Size (in. O.D.)
Outside Diameter (mm)
1/4
3/8
1/2
5/8
3/4
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.
Keep refrigerant pipe dry, clean, and airtight.
No moisture should be inside the piping.
- Significant hydrolysis of refrigerant oil.
Possible
- Refrigerant oil degradation.
Problems
- 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 insure the vacuum holds at
that level for 24 hours
Tightening Torque (ft-lbs.)
6.35
13.0 - 18.0
9.52
24.6 - 30.4
12.7
39.8 - 47.7
15.88
45.4 - 59.3
19.05
71.5 - 87.5
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.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
REFRIGERANT PIPING
Keep Pipes Capped While Storing.
Clean
Dust
- 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.
Airtight
No leaks should occur.
Leaks
41
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