Split Rooftop Unit Installation Guidelines - LG MULTI V ARNU363DDB4 Installation Manual

Device Connection Limitations
When designing a system, the engineer must take into consideration the combination ratio.
Installation Options
MV Outdoor Unit (ODU) with only RTUs The total capacity of all RTUs must be 50-110% of ODU capacity.
MV ODU with RTUs and other indoor
units
Failure to comply with the above connection conditions for installation can cause reduced heating/cooling performance.
Sample Layouts (Combination Ratio Examples)
Figure 9: RTU Correct Combination Ratio.
Outdoor Unit
20.0 Ton
Split RTU Split RTU
6.0 Ton 6.0 Ton
Images are for illustrative purposes only and are not accurate representations. For specific details on piping limitations and other refrigerant system
rules, review the information in the appropriate Engineering or Installation Manual, and follow the LATS diagram.
INSTALLATION GUIDELINES
• The total capacity of all indoor units (Indoor Unit + RTU) must be 50-100% of outdoor unit
capacity.
• The total capacity of RTUs must be less than 60% of the total capacity of all indoor units.
Indoor Unit
Indoor Unit
4.0 Ton
4.0 Ton
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.
Combination Ratio
Figure 10: RTU Incorrect Combination Ratio.
Outdoor Unit
20.0 Ton
Incorrect installation: Total capacity of indoor units
cannot exceed 100% of outdoor unit capacity.
Split RTU Split RTU
6.0 Ton 6.0 Ton
Combination Ratio
Indoor Unit
Indoor Unit
4.0 Ton 6.0 Ton
21