Engineering Manual

Power Wiring / Communications Cable Guidelines
A voltage drop may 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.
• Loose wiring may cause unit malfunction, or the terminal to overheat and catch fire.
• Terminal screws may become loose during transport. Properly tighten the terminal connections during installation.
ART COOL GALLERY INDOOR UNITS
Connecting the Power Wiring and Communications Cable
Installation and Best Layout Practices
Control Board Cover
Lock nut
(field supplied)
Conduit
(field supplied)
1(L1)2(L2) 3
Figure 61:Connecting the Power Wiring / 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 access hole of the indoor unit (ground wire should be
longer than the other wires / cables). Unscrew the control board
cover.
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 to the control
board.
4. Reattach the control board cover.
Figure 62:Simplied View of Indoor Unit to Outdoor Unit / Branch
Distribution Unit Terminal Connections—LMAN097HVP and
LMAN127HVP models.
• 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 recommended 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.
Indoor Unit Terminal Block
GND
Outdoor Unit Terminal Block or
Branch Distribution Unit Terminal Block
(Multi F MAX Systems Only)
GND
GRN / YLW
BR
BL
RD
3 or S
3(C)2(L2)1(L1)
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
52 | ART COOL GALLERY™
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
F
MAX
MULTI
F