LG Multi V Water IV - Refrigerant Piping Installation: Insulation Thickness; Minimum EPDM Insulation Thickness Requirements

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Refrigerant Piping
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Always properly insulate the piping. Insufcient 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 nishes. Pay special attention to insulating the
pipes installed in the ceiling plenum.
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 158°F.
Follow locals codes and the designer’s instructions when selecting EPDM insulation wall thickness.
Classication
Piping
(in. OD)
Air-Conditioned Location Non-Air Conditioned Location
1. Typical Conditioned
Location
2. Special Conditioned
Location
3. Typical Unconditioned
Location
4. Special Unconditioned
Location
Liquid pipe
1/4
>1/2 inches >1/2 inches >1/2 inches >1/2 inches
3/8
≥1/2 >1/2 inches >1/2 inches >1/2 inches >1/2 inches
Vapor pipe
3/8
>1/2 inches
>3/4 inches >3/4 inches
>1 inch
1/2
5/8
3/4
7/8
1
1-1/8
>3/4 inches
1-1/4
>1 inch >1 inch
1-3/8
1-1/2
1-3/4
Table 59: Minimum Refrigerant Pipe EPDM Insulation Wall Thickness Requirements.
1
1
The thickness of the above insulation material is based on heat conductivity of 0.61 Btu/in/h/ft
2
/°F.
REFRIGERANT PIPING INSTALLATION
Insulating the Refrigerant Piping