Best Practices for LG HVAC System Installation

ManualsBrandsLG ManualsAir Conditioners32000 BTU Quad-Zone Mini Split System

Due to our policy of continuous product innovation, some specications may change without notication.

Obstacles

When an obstacle, such as an I-beam or concrete T, is in the path of

the planned refrigerant pipe run, it is best practice to route the pipe

over the obstacle. If adequate space is not available to route the

insulated pipe over the obstacle, then route the pipe under the obsta-

cle. In either case, it is imperative the length of the horizontal section

of pipe above or below the obstacle be a minimum of three (3) times

the longest vertical rise (or fall) at either end of the segment.

Figure 3: Installing Piping Above and Below an Obstacle.

MINIMUM

Above an obstacle

MINIMUM

Below an obstacle

Pipe Supports

A properly installed pipe system should be adequately supported to avoid pipe sagging.

Sagging pipes become oil traps that lead to equipment malfunction.

Pipe supports should never touch the pipe wall; supports shall be installed outside (around)

the primary pipe insulation jacket. Insulate the pipe first because pipe supports shall be

installed outside (around) the primary pipe insulation jacket. Clevis hangers should be used

with shields between the hangers and insulation. Field provided pipe supports should be

designed to meet local codes. If allowed by code, use fiber straps or split-ring hangers

suspended from the ceiling on all-thread rods (fiber straps or split ring hangers can be used

as long as they do not compress the pipe insulation). Place a second layer of insulation over

the pipe insulation jacket to prevent chafing and compression of the primary insulation in the

confines of the support clamp.

A properly installed pipe system will have sufficient supports to avoid pipes from sagging

during the life of the system. As necessary, place supports closer for segments where

potential sagging could occur. Maximum spacing of pipe supports shall meet local codes.

If local codes do not specify pipe support spacing, pipe shall be supported:

• Maximum of five (5) feet on center for straight segments of pipe up to 3/4 inches outside

diameter size.

• Maximum of six (6) feet on center for pipe up to one (1) inch outside diameter size.

• Maximum of eight (8) feet on center for pipe up to two (2) inches outside diameter size.

Wherever the pipe changes direction, place a hanger within twelve (12) inches on one side

and within twelve (12) to nineteen (19) inches of the bend on the other side. Support piping

at indoor units, Y-branch, and Header fittings as shown.

Figure 4: Pipe Hanger Details.

Figure 5: Typical Pipe Support Location—

Change in Pipe Direction.

Figure 6: Pipe Support at Indoor Unit. Figure 7: Pipe Support at Y-branch Fitting.

Figure 8: Pipe Support at Header Fitting.

Max. 12"

~ 12" – 19"

A + B ~ 12" – 19"

Max. 12" Max. 12"

Max. 12"

Use a 4" + long sheet curved sheet metal

saddles between hanger bracket and insula-

tion to promote linear expansion/contraction.

REFRIGERANT SYSTEM ENGINEERING