Insulation - LG ARUM072BTE5 Installation Manual

For information regarding insulation for underground or penetration situations, see the "General Refrigerant Piping System Information" section.
Refrigerant Piping System Insulation
All refrigerant piping from the outdoor unit to the indoor units / heat
recovery units must be insulated correctly for safety and usage.
Y-branch connections, header branch connections, refrigerant
piping, 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 refrig-
erant piping including liquid lines and vapor lines shall be insulated
separately. Insulation shall be a minimum 1/2 inches thick, and
thickness may 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 shall be glued with no air gaps. Insulation
material shall fit snugly against the refrigeration pipe with no air
space between it and the pipe. Insulation passing through pipe
hangers, inside conduit, and/or sleeves must not be compressed.
Protect insulation inside hangers and supports with a second layer.
All pipe insulation exposed to the sun and outdoor elements shall
be properly protected with PVC, aluminum vapor barrier, or alterna-
tively placed in a weather-resistant enclosure such as a pipe rack
with a top cover; and meet local codes. LG-provided Y-branches
are shipped from the factory with pre-formed peel-and-stick foam
insulation jackets, with a 1.84 lb./ft.
meet UL94 MF-1 flammability.
The design engineer should perform calculations to determine if the
factory-supplied insulation jackets are sufficient to meet local codes
and avoid sweating. Add additional insulation if necessary. Check
the fit of the insulation jacket after the header fitting and all run-out
pipes are installed. Mark all pipes at the point where the insulation
jacket ends. Remove the jacket. Install field provided insulation
on the run-out and main trunk pipes first. Install the LG-provided
insulation plugs on the ends of all unused header ports. Peel the
adhesive glue protector slip from the insulation jacket and install the
clam-shell jacket over the fitting.
C
D
B
E
Liquid Pipe
A
Gas Pipe
B
C Power Wiring
Insulation
D
Communication Cables
E
density, 1/2 inch thickness, and
3
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.
Typical Pipe Insulation, Power Wire and Communications Cable
Arrangement.
Typical Insulation Butt-Joint at Indoor
Unit Casing.
D
A
Surface of
Indoor Unit Casing
Insulating the Shut Off / Isolation Ball Valve (If Present).
Indoor Unit
INSULATION
Vapor Line
Insulation Material
Liquid Line
Pipe Sleeve
Insulation
Material
Min. 18 Gauge
Power/Communication
Cable
Typical Refrigerant Flare
Fitting Insulation Detail.
Field-Provided
Pipe Insulation
Cable Tie, etc.
(Field Supplied)
Refrigerant Piping
Insulation (Field Supplied)
93