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
Qidu(combi) = Qodu(rated) x Qidu(rated)
ΣQidu(rated)
EQUIPMENT SELECTION PROCEDURE
Using the System Combination Tables
Multi F system combination tables illustrate how each indoor unit receives a percentage of total outdoor unit rated capacity. Allocation is
based on:
• Combinations of Non-Ducted Indoor Units
• Combinations of Ducted Indoor Units
• Combinations of Mixed Non-Ducted and Ducted Indoor Units
Multi F MAX system combination tables only show the total connected indoor unit capacity, but individual indoor unit capacity can be
calculated using the formula:
A more accurate method to determine expected capacity would be to apply the outdoor unit’s corrected capacity instead of rated capacity.
Table 99: Multi F Outdoor Unit (Multiple Piping) to Indoor Unit Refrigerant Line Length Derates.
Piping Length (feet) Cooling Capacity (%) Heating Capacity (%)
7,000 Btu/h Indoor Unit Models
25.0 100.0 100.0
32.8 98.4 99.2
49.2 95.8 97.8
65.6 93.2 96.4
82.0 90.6 95.0
9,000 Btu/h Indoor Unit Models
25.0 100.0 100.0
32.8 98.0 99.0
49.2 94.8 97.4
65.6 91.6 95.8
82.0 88.4 94.2
12,000 Btu/h Indoor Unit Models
25.0 100.0 100.0
32.8 97.6 98.6
49.2 93.8 96.4
65.6 89.9 94.1
82.0 86.1 91.9
15,000 Btu/h Indoor Unit Models
25.0 100.0 100.0
32.8 97.2 98.2
49.2 93.0 95.4
65.6 88.8 92.6
82.0 84.6 89.8
18,000 Btu/h Indoor Unit Models
25.0 100.0 100.0
32.8 98.6 99.6
49.2 96.4 99.0
65.6 94.1 98.3
82.0 91.9 97.7
24,000 Btu/h Indoor Unit Models
25.0 100.0 100.0
32.8 98.2 99.2
49.2 95.4 98.0
65.6 92.4 96.6
82.0 89.6 95.4
Capacity Coefficient Factors
Refrigerant Line Length Derates
For air-cooled systems, a capacity correction factor may have to be applied to account for the length of the system’s refrigerant pipe. Rate of
change in capacity due to increased piping lengths is shown in Table 99, Table 100, and Table 101.
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.
APPLICATION GUIDELINES | 177
Application Guidelines
MULTI
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MULTI
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