Refrigerant Piping - LG MULTI F Installation Manual

F
MULTI
F
MULTI MAX
Refrigerant Piping System Insulation
All refrigerant piping from the outdoor unit to the indoor units / branch distribution units (Multi F MAX only) 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 below 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.
Figure 38: Typical Insulation Butt-
Joint at Indoor Unit Casing.
Surface of
Indoor Unit Casing
GENERAL INSTALLATION GUIDELINES
Figure 39: Typical Refrigerant
Flare Fitting Insulation Detail.
Field-Provided
Pipe Insulation
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.
Figure 40: Insulating the Shut Off / Insulation Ball Valve (If Present).
Indoor Unit

Refrigerant Piping

Cable Tie, etc.
(Field Supplied)
Refrigerant Piping
Insulation (Field Supplied)
31