Installation Manual
Table Of Contents
- Safety Instructions
- Introduction
- Unit Nomenclature
- General Data
- Specifications
- Typical Multi F/Multi F Max Systems
- Refrigerant Piping Requirements
- General Installation Guidelines
- Inspection
- Refrigerant Piping
- Piping Materials and Handling
- Piping Preparation
- Piping Connections
- Piping Insulation
- Drain Piping
- Electrical Wiring
- Power Wiring Specifications and Best Practices
- Power Wiring Specifications and Best Practices/Controller Options
- Indoor Unit Electrical Connections Guidelines
- Indoor Unit Electrical Connections Procedure
- Self Diagnosis Functions
- LG SIMS - Self Diagnosis Functions
- Optional Wall-Mounted Sensor and Controller
- Troubleshooting
- Cautions for Refrigerant leaks
- Installation CHECKLIST
17
Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
MA
X
MUL
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MUL
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Table 9: Equivalent Piping Length for Elbows,
Y-branches, and Branch Distribution Units.
1
Kit contains two Y-branches: one for liquid and one for vapor.
Component
Size (Inches)
1/4 3/8 1/2 5/8 3/4
Elbow (ft.)
0.5 0.6 0.7 0.8 1.2
Y-Branch Kit (ft.)
(Multi F MAX systems only)
1
1.6
Branch Distribution Unit (ft.)
(Multi F MAX systems only)
8.2
Field-supplied elbows are allowed if they are long radius and designed for use with R410A refrigerant. Be
sure to account for the additional pressure losses in equivalent pipe length calculations for each elbow,
y-branch, and branch distribution unit. The equivalent pipe length of each elbow, Y-branch, and/or branch
distribution unit must be added to each pipe segment to ensure maximum lengths are not exceeded.
Using Refrigerant Components
Field Supplied Refrigerant Piping
Type ACR copper is the only approved refrigerant pipe material for use with LG Multi F air conditioning
products. ACR rated tubing is the only type that ships with yellow caps. Approved tubing for use with
Multi V products will be marked “R410 RATED” along the length of the tube. Tube wall thickness should
meet local code requirements and be approved for a maximum operating pressure of 551 psi.
Refer to the refrigerant piping section (starting on page 22) of the General Installation Guidelines for
more information on piping.
GENERAL DATA
Refrigerant Piping Requirements