Specification Guide

7DEOH Multi F / Multi F Max Rated Outdoor Unit Capacity.
Outdoor Units
LMU18CHV LMU24CHV LMU30CHV LMU36CHV LMU480HV LMU540HV LMU600HV
Rated Capacity
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Cooling 17,000 20,000 30,000 32,000 48,000 52,500 60,000
Heating 22,000 24,000 32,000 36,000 54,000 58,000 64,000
Connectable
Indoor
Units
Minimum No. of Connectable IDUs 2222222
Maximum No. of Connectable IDUs 2344888
Maximum Capacity Index 24,000 33,000 40,000 48,000 65,000 73,000 81,000
EQUIPMENT SELECTION PROCEDURE
7DEOH Allowable Indoor Unit to Multi F / Multi F MAX with LGRED Outdoor Unit Connections.
Choosing the Appropriate Outdoor Unit
After all indoor units are properly sized to offset the applicable loads in each zone, select the outdoor unit by choosing a size that meets both
the load-cooling requirement, and offsets the sum of the heating load. Then, the system’s combination ratio must be evaluated and confirmed
it is within the allowable range (the combination ratio compares the nominal capacity of all connected indoor units to the nominal capacity of
the outdoor unit serving them). The total nominal capacity of all indoor units must be smaller than the total nominal capacity of the outdoor
unit. If the combination ratio is more than 100%, the designer is undersizing the outdoor unit relative to the combined nominal capacity of the
connected indoor units. In some designs, oversized indoor units will be unavoidable in the case where the smallest size indoor unit available
from LG is larger than what is necessary to satisfy the zone load. This scenario will also occur when an indoor unit selection one size down
from the selected unit is slightly short of fulfilling the design load requirements, and the designer must choose the next largest size unit.
Sometimes it is required to choose a larger capacity outdoor unit if the installation space is big enough. Also, it will be prudent to oversize the
outdoor unit to address those times when the weather conditions will exceed the design conditions, to minimize the possibility of ventilation
systems that causes the space temperature to drift outside design parameters, or when the indoor unit’s entering air temperature falls outside
the approved design temperature range.
Indoor units Outdoor units
Model Type
Indoor Unit Nominal
Capacity (Btu/h)
LMU180HHV LMU240HHV LMU300HHV LMU360HHV LMU420HHV
Maximum No. of Connectable Indoor Units
23456
ART COOL Mirror
9,000 O O O O O
12,000 O O O O O
18,000 - O O O O
ART COOL Gallery
9,000 O O O O O
12,000 O O O O O
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7,000 O O O O O
9,000 O O O O O
12,000 O O O O O
15,000 O O O O O
18,000 - O O O O
24,000 - O O O O
Ceiling Concealed Duct-
Low Static
9,000 O O O O O
12,000 O O O O O
18,000 - O O O O
Ceiling Concealed Duct-
High Static
24,000 - - O O O
36,000 - - - - O
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7,000 O O O O O
9,000 O O O O O
12,000 O O O O O
18,000 - O O O O
Vertical-Horizontal Air Handler
18,000 - O O O O
24,000 - - O O O
36,000 - - - - O
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APPLICATION GUIDELINES | 187
Application Guidelines
MULTI
F
MAX
MULTI
F