Piping Insulation - LG LMN078HVT Installation & Maintenance

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Installation manual (55 pages)

Installation manual (54 pages)

Service manual (93 pages)

Table Of Contents

Table of Contents

MULTI

MAX

Connecting the Indoor Unit Piping to the Field-Installed Piping

1. Center align the indoor unit piping (refrigerant and drain) and the

field-installed piping, then hand tighten the flare nut.

2. Tighten the flare nut with a torque wrench.

3. Attach the drain tube piping to the

indoor unit drain hose as shown.

Note:

If the drain hose is routed inside a room,

add insulation to prevent condensation

from forming.

Refrigerant Piping System Insulation

All refrigerant piping including Y-branch connections, field-provided isolation ball valves, service valves, and elbows must be 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" thick, and

thickness may need to be increased based on ambient conditions and local codes. Table 26 lists recommended 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

Note:

Follow locals codes when selecting EPDM insulation wall thickness. Thickness in Table 26 is based on heat conductivity of 0.61 Btu/in/h/ft2/°F.

Classification

ø1/4 inches

Liquid pipe

ø3/8 inches

≥ø1/2 inches

ø3/8 inches

ø1/2 inches

Vapor pipe

ø5/8 inches

ø3/4 inches

1. Air-conditioned, Typical location

• When piping passes through an indoor area where the indoor unit operates, such as an apartment, classroom, office, mall, hospital, etc.

2. Air-conditioned, Special location

• When the location is air conditioned, but has severe temp/humidity difference due to high ceilings, such as a church, auditorium, theater, etc.

• When the location is air conditioned, but internal temperature/humidity are high, such as a bathroom, swimming pool, locker room, etc.

3. Non-air conditioned, Typical location

• When piping passes through an indoor area where the indoor unit does not operate, such as a hallway, dormitory, or school, etc.

4. Non-air conditioned, Special location (when both conditions listed below are present)

• When piping passes through an indoor area that is not conditioned

• When the humidity is high and there is no air flow in the location where the piping is installed

Figure 43: Extending the Drain Hose.

Drain extension

Narrow tape

Adhesive

Table 26: Insulation Guidelines for Typical and Special Circumstances.

Air-conditioned location

1. Typical location

1/2 inches

Due to our policy of continuous product innovation, some specifications may change without notification.

PIPING CONNECTIONS

Figure 42: Indoor Unit to Field-Installed Piping Connection.

Indoor unit piping

Indoor unit

drain hose

Torque

wrench

40-90°F

2. Special location

3. Typical location

1/2 inches

3/4 inches