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Installation and Best Layout Practices
DUCT (LOW STATIC) INDOOR UNITS
Power Wiring / Communications Cable Guidelines
Connecting the Power Wiring and Communications Cable
1. Insert the power wiring / communications cable from the out-
door unit or branch distribution unit (Multi F MAX systems only)
through the side of the indoor unit. Pass the wiring through the
designated access holes to prevent damage. To prevent electro-
magnetic interference and product malfunction, leave a space
between the power wiring and communications cable outside of
the indoor unit.
2. Connect each wire to its appropriate terminal on the indoor unit
control board. Verify that the color and terminal numbers from
the outdoor unit or branch distribution unit (Multi F MAX systems
only) wiring match the color and terminal numbers on the indoor
unit.
3. Secure the power wiring / communications cable with the cable
restraint.
4. Screw the steel clamp to the inside of the control panel.
• Place the wiring / cables in the clamp and tighten the plastic clamp to an open surface of the control panel.
• When clamping, do not apply force to the wiring connections.
• Neatly arrange the wiring, do not catch the wiring in the electric box cover, and ensure the cover firmly closes.
5. Fill in any gaps around the wiring access hole with sealant to prevent foreign particles from entering the indoor unit.
Indoor Unit Terminal Block
1(L) 2(N)
GND
3
Outdoor Unit Terminal Block or
Branch Distribution Unit Terminal Block
(Multi F MAX Systems Only)
GND
GRN /
YLW
BR
BL
RD
3 or S
Figure 141:Indoor Unit to Outdoor Unit / Branch Distribution Unit
(Multi F MAX systems only) Power Wiring / Communications Cable
Connections.
Using a Conduit
1. Remove the rubber stopper on the indoor unit. Pass the power
wiring / communications cable through the conduit, the conduit
mounting plate, and to the control panel of the indoor unit.
2. Connect the power wiring / communications cable to the indoor
unit terminal block.
3. Screw the conduit mounting plate to the indoor unit.
4. Tighten the conduit and the conduit mounting plate together.
Lock nut
Conduit
mounting
plate
Conduit
Figure 142:Exterior View of Conduit Installation.
• Follow manufacturer’s circuit diagrams in the technical manuals.
• Confirm power source specifications.
• Confirm that the electrical capacity is sufficient.
• Starting current must be maintained ±10 percent of the rated current marked on the outdoor unit name plate.
• Confirm cable thickness specifications.
• It is required that a circuit breaker is installed, especially if conditions could become wet or moist.
• Include a disconnect in the power wiring system, add an air gap contact separation of at least 1/8 inch in each active (phase) conductor.
• Loose wiring will cause unit to malfunction, overheat, and catch fire, resulting in severe injury or death.
Note:
• Terminal screws will become loose during transport. Properly tighten the terminal connections during installation.
A voltage drop will cause the following problems:
• Magnetic switch vibration, fuse breaks, or disturbance to the normal function of an overload protection device.
• Compressor will not receive the proper starting current.
DUCT (LOW STATIC) | 111
Ceiling-Concealed Duct (Low Static)
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
MULTI
F
MAX
MULTI
F
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