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F
MULTI
F
MULTI
MAX
Refrigerant Piping System Insulation
All refrigerant piping from the outdoor unit to the indoor units / branch distribution units must be insulated correctly for safety and usage.
Refrigerant piping, Y-branch connections, field-provided isolation ball valves (if present), service valves, and elbows must be properly and
completely insulated using closed cell pipe insulation (up to the indoor unit piping connections). To prevent heat loss / heat gain through the
refrigerant piping, all refrigerant piping including liquid lines and vapor lines must be insulated separately. Insulation must be a minimum 1/2
inches thick, and thickness will need to be increased based on ambient conditions and local codes. Table on next page lists minimum wall
thickness requirements for Ethylene Propylene Diene Methylene (EPDM) insulation.
Inside the outdoor unit, maximum pipe temperature is 248°F and minimum pipe temperature is -40°F. For field insulation of refrigerant piping
between outdoor units and indoor units, consider the following pipe temperature ranges for an operating heat pump system:
• Heating mode refrigerant temperature ranges: Liquid = 75-118°F; High Pressure Vapor = 95-220°F
• Cooling mode refrigerant temperature ranges: Liquid = 75-118°F; Low Pressure Vapor = 40-90°F
All insulation joints must be glued with no air gaps. Insulation material must fit snugly against the refrigeration pipe with no air space between
it and the pipe.
Do not allow insulation passing through pipe hangers, inside conduit, and/or sleeves to be compressed. Protect insulation
inside hangers and supports with a second layer. All pipe insulation exposed to the sun and outdoor elements must be properly protected
with PVC, aluminum vapor barrier, or alternatively placed in a weather-resistant enclosure such as a pipe rack with a top cover; and meet
local codes.
Follow locals codes when selecting EPDM insulation wall thickness. Thickness in the table is based on heat conductivity of 0.61 Btu/in/h/ft
Minimum Refrigerant Pipe Ethylene Propylene Diene Methylene (EPDM) Insulation Wall Thickness Requirements
Table 17: Insulation Guidelines for Typical and Special Circumstances.
ø1/4 inches
Liquid pipe
ø3/8 inches
ø3/8 inches
ø1/2 inches
Vapor pipe
ø5/8 inches
ø3/4 inches
1. Typical Air-Conditioned Location
A building plenum or space that contains conditioned air that does not exceed 80°F DB. When piping passes through an indoor area where
the indoor unit operates, such as an apartment, classroom, office, mall, hospital, etc.
2. Special Air-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.
Air-conditioned location
1. Typical Conditioned
2. Special Conditioned
Location
1/2 inches
1/2 inches
1/2 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.
3. Typical Unconditioned
Location
Location
1/2 inches
1/2 inches
1/2 inches
1/2 inches
3/4 inches
3/4 inches
INSTALLATION
Non-air conditioned location
4. Special Unconditioned
Location
1/2 inches
1/2 inches
1 inch
2
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