LG Electronics LAU240HYV3 LG Air Conditioner Cooling Area,

Refrigerant Piping / Brazing Practices

Figure 33: Refrigerant Pipe Brazing.

It is imperative to keep the piping system free of contaminants and debris such as copper burrs, slag, or carbon dust during installation.

All joints are brazed in the field. Single Zone Wall Mounted Art Cool Premier

refrigeration system components contain very small capillary tubes, small orifices,

electronic expansion valves, oil separators, and heat exchangers that can easily

become blocked. Proper system operation depends on the installer using best

practices and utmost care while assembling the piping system.

• While brazing, use a dry nitrogen purge operating at a minimum pressure of three

• Blow clean all pipe sections with dry nitrogen prior to assembly.

• Protect isolation valves, electronic expansion valves, and other heat-sensitive control components from excessive heat with a wet rag or a

Refrigerant Piping System Insulation

All refrigerant piping, field-provided isolation ball valves, service valves, and long radius elbows shall be completely insulated using closed

cell pipe insulation. The liquid and vapor lines must be insulated separately.

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 1/2″ thick, and thickness may need to be increased based on ambient conditions and local codes.

All insulation joints shall 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

aluminum vapor barrier, or alternatively placed in a weather-resistant enclosure such as a pipe rack with a top cover, and meet local codes.