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49
Refrigerant Piping Connections
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.
MULTI
F
MAX
MULTI
F
1. Typical location (Air-conditioned location): When the piping passes through an indoor area where the indoor unit operates.
• Apartment, classroom, office, mall, hospital, etc.
2. Special location (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.
3. Typical location (Non-Air conditioned location): When the piping passes through an indoor area where the indoor unit
does not operate.
• Hallway or a dormitory or school, etc.
4. Special location (Non-Air conditioned location): If conditions 1 and 2 below are present.
1. When the piping passes through an indoor area where the indoor unit does not operate.
2. When the humidity is high and there is no air flow in the location where the piping is installed.
• The thickness of the above insulation material is based on heat conductivity of 0.61 Btu/in/h/ft
2
)
Refrigerant Piping Insulation
40 in40 in
A
B
D
F
G
B
G
D
B
H
I
J
A
E
B
I
A
B
D
C
Inside wall (concealed)
Floor (fire-resistance)
Area between fire-resistant
insulation and boundary wall
Roof pipe shaft
Outside wall
Outside wall (exposed)
Sleeve
Insulation
Lagging
Caulk
Band
Water-resistant layer
Sleeve with edge
Lagging
Mortar or other fire-resistant caulk
Fire-resistant insulation
When filling an access hole with mortar, cover the
area with steel plate so that the insulation will not
fall through. For this area, use fire-resistant
materials for both the insulation and cover.
Vinyl cover should not be used.
Pipe Sleeves at Penetrations
LG requires that all pipe penetrations through walls, floors, and
pipes buried underground be routed through a properly insulated
sleeve that is sufficiently sized to provide free movement of the pipe
and does not compress the insulation. Underground refrigerant pipe
shall be routed inside a protective sleeve to prevent insulation dete-
rioration. Also follow federal, state, and local regulations and codes
when choosing a sleeve type.
Figure 63: Pipe Sleeve Options.
For example:
Diameter of Gas Piping: 1/2"
Diameter of Liquid Piping: 1/4"
Thickness of Gas Piping Insulation: 0.4" x 2
Thickness of Liquid Piping Insulation: 0.4" x 2
Surplus: 0.8"
Sleeve diameter (total): 3.1" minimum
Diameter of penetrations shall be determined by pipe diameter
plus the thickness of the insulation.
REFRIGERANT PIPING PREPARATION
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