LG MULTI F Engineering Manual page 175
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F
MULTI
F
MULTI
MAX
Multiplier Examples
Example 1
Branch Distribution Unit (PMBD3641)
Outdoor Unit: LMU540HV
First Indoor Unit:
LMCN125HV
Total Capacity Index =
12
Table 97: Allowable Indoor Unit to Outdoor Unit Connections.
Indoor units
Model Type
ART COOL Mirror
ART COOL Gallery
Wall Mounted
Ceiling Concealed Duct-Low Static
Ceiling Concealed Duct-High Static
Four-Way Ceiling Cassette
Vertical-Horizontal Air Handler
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 should 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 should 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 ca-
pacity of the connected indoor units. In some designs, oversized indoor units may 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 may 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 larg-
est size unit. Sometimes it is recommended to choose a larger capacity outdoor unit if the installation space is big enough. Also, it may be
prudent to oversize the outdoor unit to address those times when the weather conditions may 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.
EQUIPMENT SELECTION PROCEDURE
+
Second Indoor Unit:
+
Third Indoor Unit:
LSN090HSV4
LMVN360HV
+
9
+
36 x 1.3
= 67.8 < 73
Acceptable
Combination
Indoor Unit Nominal
Capacity (Btu/h)
9,000
12,000
18,000
9,000
12,000
7,000
9,000
12,000
15,000
18,000
24,000
9,000
12,000
18,000
24,000
36,000
7,000
9,000
12,000
18,000
24,000
36,000
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.
Example 2
Branch Distribution Unit (PMBD3620)
Outdoor Unit: LMU540HV
Total Capacity Index =
Outdoor units
LMU18CHV
LMU24CHV
Maximum No. of Connectable Indoor Units
2
3
O
O
O
O
-
O
O
O
O
O
O
O
O
O
O
O
O
O
-
O
-
O
O
O
O
O
-
O
-
-
-
-
O
O
O
O
O
O
-
O
-
-
-
-
First Indoor Unit:
+
Second Indoor Unit:
LMVN240HV
LMVN240HV
24 x 1.2
+
24 x 1.2
= 57.6 < 73
Acceptable
Combination
LMU36CHV
LMU540HV
4
8
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
-
O
O
O
O
O
O
O
O
O
O
O
-
O
APPLICATION GUIDELINES | 175
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