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REFRIGERANT PIPING DESIGN
Insulating the Refrigerant Piping
Note:
Always properly insulate the piping. Insufficient insulation will result in condensation, reduced heating/cooling performance, etc. Also, if the pipes
aren't insulated properly, condensation could potentially cause damage to building finishes. Pay special attention to insulating the pipes installed
in the ceiling plenum.
Note:
Follow locals codes and the designer's instructions when selecting EPDM insulation wall thickness.
Table 22: Minimum Refrigerant Pipe EPDM Insulation Wall Thickness Requirements.
Classification / Piping O.D.
ø1/4 inches
Liquid pipe
ø3/8 inches
≥ø1/2 inches
ø3/8 inches
ø1/2 inches
ø5/8 inches
ø3/4 inches
ø7/8 inches
Vapor pipe
ø1 inch
ø1-1/8 inches
ø1-1/4 inches
ø1-3/8 inches
ø1-1/2 inches
ø1-3/4 inches
The thickness of the above insulation material is based on heat conductivity of 0.61 Btu/in/h/ft
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1. Typical Conditioned Location
A building plenum or space that contains conditioned air that does not exceed 80°F DB.
2. Special Conditioned Location
1. When the location is air conditioned, but there is severe temperature/humidity difference due to high ceilings
• Church, auditorium, theater, lobby, etc.
2. When the location is air conditioned, but internal temperature/humidity are high
• Bathroom, swimming pool, locker room, etc.
3. Typical Unconditioned Location
An unconditioned space inside a building.
4. Special Unconditioned Location: If conditions 1 and 2 below are present.
1. An unconditioned space or plenum of a building.
2. An area where there is an elevated humidity level.
5. Additional Insulation for Indoor Units May be Required in Humid Environments.
The air conditioner factory insulation has been tested according to "ISO Conditions with Mist," and it satisfies the requirements. If the system
has been operating for a long time in a high humidity environment (dew point temperature: more than 73°F), condensate is likely to form. If
this happens, install 3/8 inch thick ethylene propylene diene methylene (EPDM) insulation that is plenum-rated with a heat-resistance factor
of more than 248°F.
38
Air-conditioned location
1. Typical Conditioned
2. Special Conditioned
Location
>1/2 inches
>1/2 inches
>1/2 inches
>3/4 inches
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.
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3. Typical Unconditioned
Location
Location
>1/2 inches
>1/2 inches
>1/2 inches
>1/2 inches
>3/4 inches
>3/4 inches
>1 inch
>1 inch
/°F.
2
Non-air conditioned location
4. Special Unconditioned
Location
>1/2 inches
>1/2 inches
>1 inch
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