Refrigerant Piping Insulation - LG MULTI F Installation Manual
Multi-zone heat pump systems
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- Engineering manual (224 pages) ,
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REFRIGERANT PIPING PREPARATION
Refrigerant Piping Insulation
Refrigerant Piping System Insulation
All refrigerant piping from the outdoor unit to the indoor units / BD units (Multi F MAX systems only) must be insulated correctly for safety and
usage. Y-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 refrigerant piping including liquid lines and vapor lines shall be insulated separately. Insulation shall be a minimum
requirements for Ethylene Propylene Diene Methylene (EPDM) insulation.
between outdoor units and indoor units, consider the following pipe temperature ranges for an operating heat pump system:
•
•
Figure 60: Typical Pipe Insulation, Power Wire and
Communications Cable Arrangement
•
Do not insulate gas and liquid pipes together as this
temperature fluctuations.
• Be sure to fully insulate the piping connections.
Minimum Refrigerant Pipe Ethylene Propylene Diene Methylene (EPDM) Insulation Wall Thickness Requirements
Follow locals codes when selecting EPDM insulation wall thickness.
Table 37: Insulation Guidelines for Typical and Special Circumstances
ø1/4 inch
Liquid pipe
ø3/8 inch
ø3/8 inch
ø1/2 inch
ø5/8 inch
ø3/4 inch
ø7/8 inch
Vapor pipe
ø1 inch
ø1-1/8 inches
ø1-1/4 inches
ø1-3/8 inches
ø1-1/2 inches
ø1-3/4 inches
48
Vapor Line
Insulation Material
Liquid Line
Pipe Sleeve
Insulation
Material
Min. 18 Gauge
Power/Communication
Cable
Indoor Unit Casing
Air-conditioned location
1. Typical location
2. Special location
1/2 inch
1/2 inch
1/2 inch
3/4 inch
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 61: Typical Insulation Butt-
Joint at Indoor Unit Casing
Surface of
Field-Provided
Pipe Insulation
3. Typical location
1/2 inch
1/2 inch
3/4 inch
1 inch
MULTI
MULTI
Figure 62: Typical Refrigerant
Flare Fitting Insulation Detail
Non-air conditioned location
4. Special location
1/2 inch
1/2 inch
1/2 inch
1/2 inch
3/4 inch
1 inch
1 inch
F
F
MAX
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