Engineering Manual
Table Of Contents
- Convergence of Technology, Innovation, Flexibility, & Style
- Unit Nomenclature
- Outdoor Unit Overview
- Indoor Unit Overview
- Controls and Options Overview
- Art Cool Mirror Indoor Units
- General Data / Specifications
- Dimensions
- Cooling Capacity Table
- Heating Capacity Table
- Acoustic Data
- Air Velocity and Temperature Distribution
- Refrigerant Flow Diagram
- Wiring Diagram
- Factory Supplied Parts and Materials
- Installation and Best Layout Practices
- Art Cool Gallery Indoor Units
- General Data / Specifications
- Dimensions
- Cooling Capacity Table
- Heating Capacity Table
- Acoustic Data
- Air Velocity and Temperature Distribution
- Refrigerant Flow Diagram
- Wiring Diagram
- Factory Supplied Parts and Materials
- Installation and Best Layout Practices
- Standard Wall-Mounted Indoor Units
- General Data / Specifications
- Dimensions
- Cooling Capacity Table
- Heating Capacity Table
- Acoustic Data
- Air Velocity and Temperature Distribution
- Refrigerant Flow Diagram
- Wiring Diagram
- Factory Supplied Parts and Materials
- Installation and Best Layout Practices
- Duct (Low Static) Indoor Units
- General Data / Specifications
- Dimensions
- Cooling Capacity Table
- Heating Capacity Table
- External Static Pressure
- Acoustic Data
- Refrigerant Flow Diagrams
- Wiring Diagram
- Factory Supplied Parts and Materials
- Installation and Best Layout Practices
- Duct (High Static) Indoor Units
- General Data / Specifications
- Dimensions
- Cooling Capacity Table
- Heating Capacity Table
- External Static Pressure / Acoustic Data
- Refrigerant Flow Diagrams
- Wiring Diagrams
- Factory Supplied Parts and Materials / Installation
- Installation and Best Layout Practices
- Four-Way Ceiling Cassette Indoor Units
- General Data / Specifications
- Dimensions
- Dimensions
- Cooling Capacity Table
- Heating Capacity Table
- Acoustic Data
- Air Velocity and Temperature Distribution
- Refrigerant Flow Diagram
- Wiring Diagram
- Factory Supplied Parts and Materials
- Installation and Best Layout Practices
- Vertical-Horizontal Indoor Units
- General Data / Specifications
- Dimensions
- Cooling Capacity Table
- Heating Capacity Table
- External Static Pressure
- Acoustic Data
- Refrigerant Flow Diagram
- Wiring Diagram
- Factory Supplied Parts and Materials
- Installation and Best Layout Practices
- Equipment Selection Procedure
- Building Ventilation Design Guide
- Placement Considerations
- Refrigerant Piping Design
- Design Guideline Summary
- Creating a Balanced System / Manual Layout Procedure
- LG Engineered Multi F MAX Y-Branch Kit
- Refrigerant Charge
- Installation & Layout Best Practices
- Refrigerant Piping System Layout
- Piping Insulation
- Condensate Drain Piping
- Y-Branch Kit
- Wiring Connections
- Power Wiring (208-230V) and Communications Cable Details
- Indoor Unit Group Control
- Acronyms
MULTI
F
MAX
MULTI
F
Power Wiring / Communications Cable Guidelines
Installation and Best Layout Practices
DUCT (HIGH STATIC) INDOOR UNITS
Connecting the Power Wiring and Communications Cable
1. To access the terminal block, first unscrew the cover from the control box.
2. Insert the power wiring / communications cable from the outdoor unit or branch
distribution unit (Multi F MAX systems only) through the sides of the indoor unit
and control box. Pass the wiring through the designated access holes to prevent
damage. To prevent electromagnetic interference and product malfunction, leave a
space between the power wiring and communications cable outside of the indoor
unit.
3. 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 distribu-
tion unit (Multi F MAX systems only) wiring match the color and terminal numbers
on the indoor unit.
4. Secure the power wiring / communications cable with the cable
restraint.
5. 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.
6. Fill in any gaps around the wiring access holes with sealant to
prevent foreign particles from entering the indoor unit.
Figure 172:Accessing the Indoor Unit Terminal Block.
A
Control Box
Terminal Block
Control Box Cover
1(L1)2(L2) 3
Power Wiring Connections
Lock nut
Conduit
mounting
plate
Conduit
Indoor Unit Terminal Block
1(L1 )2(L2)
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 173:Indoor Unit to Outdoor Unit / Branch Distribution Unit (Multi F
MAX systems only) Power Wiring / Communications Cable Connections.
• 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.
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.
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.
124 | DUCT (HIGH STATIC)
Multi F and Multi F MAX Indoor Unit Engineering Manual