LGRED Installation Manual

55
Insulation
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MULTI
F
MAX
MULTI
F
WITH
INSULATION
General Piping System Insulation
All refrigerant piping from the outdoor unit to the indoor units /
branch distribution units (Multi F MAX with LGRED systems only)
must be insulated correctly for safety and usage. Y-branch con-
nections, refrigerant piping, field-provided isolation ball valves (if
present), service valves, and elbows must be properly and com-
pletely 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 mini-
mum 1/2 inches thick, and thickness will need to be increased based
on ambient conditions and local codes. Table on the next page lists
minimum wall thickness requirements for Ethylene Propylene Diene
Methylene (EPDM) insulation.
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Vapor Line
Liquid Line
Communication /
Connection (Power) Cable
Pi
p
e Sleeve
Insulation Material
Insulation
Material
Figure 62: Typical Pipe Insulation, Power Wire and Communications
Cable Arrangement
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piping between outdoor units and indoor units, consider the following
pipe temperature ranges for an operating heat pump system:
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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. 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 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; or meet local codes. LG-provided Y-branches are shipped
from the factory with pre-formed peel-and-stick foam insulation jack-
ets, with a 1.84 lb./ft.
3
density, 1/2 inch thickness, and meet UL94
MF-1 flammability.
The design engineer must 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 Y-branch fitting and all run-out
pipes are installed.
Figure 63: Typical Insulation Butt-Joint at
Indoor Unit Casing.
Figure 64: Typical Refrigerant
Flare Fitting Insulation Detail.
Surface of
Indoor Unit Casing
Field-Provided
Pipe Insulation
Figure 65: Insulating the Shut Off / Isolation Ball Valve (If Present).
Indoor Unit
Insulation (Field Supplied)
Cable Tie, etc.
(Field Supplied)
Refrigerant Piping