16
MULTI V S Outdoor Unit
Product Data
5. Indoor Unit and Outdoor Unit Capacity Index
5.1 Outdoor Unit Selection
See the indoor unit capacity tables for given Indoor and Outdoor temperature.
Select the unit whose capacity is the nearest to or greater than given load.
Individual Indoor Unit capacity is subject to change by combination. Actual capacity has to be calculated according
to the combination by using Outdoor unit capacity table.
5.2 Outdoor Unit Selection
Allowable combinations are indicated below. In general, outdoor unit can be selected depending on the location
of the unit, zoning and usage of the rooms.
The indoor and outdoor unit combination is determined by comparing the sum of indoor unit capacity index with
each Outdoor Unit. It is recommended to be the nearest to 100% combination ratio or to be smaller than that. Refer
the table below. To manage cooling/heating load properly, it's better to be selected the bigger capacity outdoor unit
rather than the nearest, if the installation space is large enough.
■ Combination Ratio
Note
1. The combination ratio is defined as the sum of indoor unit nominal capacity (kW) divided by the outdoor rated cooling capacity (kW).
2. LG guarantees the operation only within a maximum combination ratio of 130%.
3. If the client wants to go beyond 130%, please contact the local subsidiary and discuss the requirements. Please be aware that going over 130% may
result in poor performance. If the total operating ratio of indoor unit exceeds 130%, the indoor unit is operated in low fan speed mode.
4. In case of 1:1 installation (i.e. one outdoor unit with one indoor unit), combination ratio cannot be exceed 105%.
5. For systems where special indoor units are involved, please refer to "Table. Combination Ratio for System with Special Indoor Units" in indoor unit PDB
INDOOR UNIT CAPACITY INDEX
* Capacity Index is same as the capacity(kW).
* 6HP or less outdoor units can be connected to indoor units below 76kBtu/h.
Line up Outdoor Unit Type Number of Outdoor Units Total Combination ratio
Multi V 5 Heat Pump & Heat recovery
Single Unit 50 ~ 130 % (200%)
Two Units 50 ~ 130 % (160%)
Three or Four Units 50 ~ 130 %
Multi V S
R410A Heat Pump
R410A Heat Recovery
R32 Heat Pump
Single Unit 50 ~ 130 % (160%)
Multi V Water IV
Heat Pump
Heat Recovery
Single Unit 50 ~ 130 % (200%)
Two Units 50 ~ 130 % (160%)
Three or Four Units 50 ~ 130 %
Multi V M Multi V M Single Unit 50 ~ 130 %
Unit Capacity
(Btu/h)
5k 7k 9k 12k 15k 18k 21k 24k 28k 36k 42k 48k 54k 76k 96k
Capacity Index 1.6 2.2 2.8 3.6 4.5 5.6 6.2 7.1 8.2 10.6 12.3 14.1 15.8 22.4 28.0
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