For jobs small to large, look for opportunities to use LG systems everywhere! Explore the many applications of LG single and multi zone systems: whole home renovations, older system replacements, home additions, energy savings opportunities, hot or cold zones … and many, many more!

Paramount to the success of an LG air conditioning system is proper sizing and installation. With the proper installation per factory guidelines found in the installation manual, LG systems offer significant advantages over traditional air conditioning systems, like increased energy efficiency, customizable design aesthetics and comfort control: and room by room.

Unit Placement (Indoor & Outdoor)

  • Leave appropriate clearances on all sides for all indoor and outdoor units to allow for proper airflow and for service access
  • Include space for drainage to ensure condensate flows properly out of the unit
  • Units should be properly anchored to prevent unnecessary vibrations

Additionally for indoor units:

  • Keep unit away from any indoor steam or excessive heat
  • No obstacles should be placed around unit
  • Do not install near a doorway
  • Condensation drain should be routed away from the unit


  • Use wire that fulfills or exceeds the minimum wire requirements:
  • Multi F MAX to BD unit: 16-4
  • All other wiring: 18-4 
  • L1 and L2 are polarity sensitive on all models
  • Indoor units are 208/230 volts (or 115 volt on the Mega HXV)
  • Terminal 3 is 115 volts
  • Never use wire nuts or splices in wiring
  • Use non-insulated spade connectors on all terminal connections
  • Use a JIS screwdriver on terminal block to avoid stripping out the screws
  • Only a dedicated electrical circuit is allowed
  • Always ground indoor and outdoor unit
  • Only connect 1 end of the shielded cable if using shielded wire

*NOTE* All wiring must comply with applicable local and national codes.


  • Use only the correct line sizes as determined by the indoor unit
  • Use only copper refrigerant piping
  • Insulate both refrigerant lines independently of each other
  • Flare connections using a 45-degree flaring tool
  • Consider Flaretite fittings for all connections and torque flares to specs
  • Do not exceed the maximum pipe length or install less than the required minimum
  • Do not make vertical loops in the refrigerant piping
  • Support pipe runs from sagging or bending


  • Leak test with dry nitrogen to at least 550 p.s.i.
  • Never use anything but soap bubbles designed for HVAC leak testing
  • Use only an approved evacuation hose for proper evacuation and leak testing
  • If possible, remove cores from system prior to starting evacuation
  • Start with fresh vacuum pump oil and evacuate to less than 500 microns
  • If refrigerant is added, use an electronic scale and weigh in the precise amount
  • Open service valves prior to energizing the unit 

Installation and Service Tools:

  • Quality Flaring Tool
  • Digital Refrigerant Charging Scale
  • Torque Wrench
  • JIS Screwdriver
  • Micron Gauge
  • Vacuum Pump
  • High-Quality Multimeter