LG MULTI F Engineering Manual page 169

F
MULTI
F
MULTI MAX
Power Wiring / Communications Cable Guidelines
• 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.
• 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.
Connecting the Power Wiring and Communications Cable
1. To access the terminal block, first unscrew the top front panel,
and then unscrew the cover from the control box.
2. Knockout the access holes for the wiring. Insert the power wiring
/ communications cable from the outdoor unit or branch distribu-
tion unit (Multi F MAX systems only) through the conduits, pass
the conduits through the designated access holes, and then in-
sert the conduits into the control box. To prevent electromagnetic
interference and product malfunction, leave a space between the
power wiring and communications cable outside of the indoor
unit.
3. Connect the power wiring and communications cables to the
appropriate terminals 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.
4. Fill in any gaps around the conduit access holes with sealant to
prevent foreign particles from entering the indoor unit.
Figure 240:Indoor Unit to Outdoor Unit / Branch Distribution Unit (Multi F MAX
systems only) Power Wiring / Communications Cable Connections.
Indoor Unit Terminal Block
GND
1(L1 ) 2 (L2) 3
VERTICAL-HORIZONTAL INDOOR UNITS
Outdoor Unit Terminal Block or
Branch Distribution Unit Terminal Block
(Multi F MAX Systems Only)
3 or S
Due to our policy of continuous product innovation, some specifications may change without notification.
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Installation and Best Layout Practices
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.
Figure 239:Connecting the Power Wiring and Communications Cable.
Control
Top Front
Box Cover
Panel
GND
Access Holes
for Wiring
Nut
Conduit
Mounting Plate
1/2-inch Conduit
Connection Cable
Communications Cable
VERTICAL-HORIZONTAL | 169