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UNIT PIPING
Refrigerant Safety / Piping Handling
Refrigerant Safety
WARNING
Verify the maximum refrigerant concentration in the space where the indoor unit will be mounted meets the concentration limit allowed by ASHRAE
Standards 15 and 34. There is danger of asphyxiation from oxygen displacement.
ASHRAE Standards 15 and 34 offer guidelines that address refrigerant safety and the maximum allowable concentration of refrigerant in
an occupied space. Refrigerant will dissipate into the atmosphere, but a certain volume of air is required for this to occur safely. For R410A
refrigerant, the maximum allowable concentration of refrigerant is twenty-six (26) lbs. per 1,000 cubic feet of an occupied space. Buildings
with twenty-four (24) hour occupancy allow half of that concentration.1
ASHRAE Standards 15 and 34 assume that if a system develops a leak, its entire refrigerant charge will dump into the area where the leak
occurs. To meet ASHRAE Standards 15 and 34, calculate the refrigerant concentration that may occur in the smallest room volume on the
system, and compare the results to the maximum allowable concentration number.
ant safety.
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Information about ASHRAE Standard 15 / 34 and addenda current as of the date of this publication.
Piping Handling
Pipes used for the refrigerant piping system must include the specified thickness, and the
interior must be clean.
While handling and storing,
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 maximum of 500
microns and insure the vacuum holds at
that level for 1 hour.
26
do not bend or damage the pipes, and take care not to
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.
Also consult state and local codes in regards to refriger-
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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 and hold for 24 hours.
Keep Pipes Capped While Storing.
Airtight
No leaks should occur.
Leaks
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