LG Multi F Install page 5

Piping Insulation
ALL piping and piping connections in a Multi F / Multi F MAX system must be insulated; a minimum 1/2 inch wall, closed cell with vapor barrier
insulation is recommended (follow all local, sate, and national requirements). Insulate all piping separately. If improperly insulated, condensate may
form on the outside of the piping and water damage within building may occur, the Multi F / Multi F MAX system will lose capacity, or heat may
move from the Multi F / Multi F MAX system to the surrounding air.
LATS
Indoor / outdoor unit locations and piping routes MUST be
finalized prior to piping work to determine actual lengths.
After piping installation starts, all changes in proposed
lengths must be forwarded to the designer for re-calcu-
lation in LATS and a NEW Field Drawing produced before
pipe is installed.
Pay attention to a possible change in unit capacities as pip-
ing lengths change! If piping lengths to be installed are not
those as specified in LATS, a new LATS file MUST be
produced BEFORE pipe work begins!
WARNING
• All power wiring and communication cable installation must be performed by authorized service providers working in accordance with local, state,
and NEC regulations.
• Install appropriately sized breakers / fuses / overcurrent protection switches and wiring in accordance with local, state, and NEC regulations. Using
inappropriately sized electrical components may result in electric shock, physical injury, or death.
• Properly ground the outdoor units.
wiring; or to the building plumbing system. Failure to properly provide an NEC approved earth ground can result in electric shock, physical injury or
death.
• Properly terminate all wiring. If wires are not properly terminated and attached, there is risk of fire, electric shock, and physical injury or death.
Power Wiring and Communication / Connection (Power) Cable Specifications
Multi F / Multi F MAX outdoor units operate at 1Ø, 208-230V, 60Hz, and power is wired to the outdoor unit only. The outdoor unit supplies power
to the indoor units and the branch distribution units through the communication / connection (power) cable.
Power supply to the outdoor unit must be selected based on NEC and local codes. Maximum allowable voltage fluctuation ±10% or nameplate
rated value. Wiring must be solid or stranded, and must comply with all local and national electrical codes. Properly ground the outdoor unit per
NEC and local codes.
Multi F communication / connection (power) cable from the outdoor unit to the indoor unit must be a minimum of 18 AWG, four (4) conductor,
stranded, shielded or unshielded.
Multi F MAX communication / connection (power) cable from the outdoor unit to the branch distribution unit(s) must be a minimum of 16 AWG,
four (4) conductor, stranded, shielded or unshielded.
Multi F MAX communication / connection (power) cable from the branch distribution unit(s) to the indoor units must be a minimum of 18 AWG,
four (4) conductor, stranded, shielded or unshielded.
• Ensure the power wiring / communication cable shield (if shielded) from the outdoor unit to the indoor units / branch distribution units is properly
grounded to the outdoor unit chassis only.
• Use a conduit for the communications / connection (power) cable from the outdoor unit to the indoor units and branch distribution unit(s). Electrical
interference my cause product malfunction.
• The communications / connection (power) cable from the outdoor unit to the indoor units / branch distribution unit(s) must be separated and isolat-
ed from power wiring to the outdoor unit, computers, radio and television broadcasting facilities, as well as medical imaging equipment. Electrical
interference my cause product malfunction.
Wiring Connections
LG uses a "JIS" type of screw for all terminals; use a JIS screwdriver to tighten and loosen these screws and
avoid damaging the terminal. Use a solderless ring or fork connection when possible.
the connections — over tightening may damage the terminals — but firmly and securely attach the wiring in a
way to prevent external forces from being imparted on the terminal block.
• The terminals labeled "GND" are NOT ground terminals. The terminals labeled
• Polarity matters. Always connect "A" to "A" and "B" to "B."
• Always create a wiring diagram that contains the exact sequence in which all the indoor units and branch distribution units (Multi F MAX systems
onlyare wired in relation to the outdoor unit.
• Do not include splices or wire nuts in the communication cable.
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Piping, continued.
Do NOT connect ground wire to refrigerant, gas, or water piping; to lightning rods; to telephone ground
Do not ground at any other point. Wiring must comply with all applicable local and national codes.
Wiring
Do not over tighten
ARE ground terminals.
JIS Screws.