Multi F Engineering Manual

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8| INTRODUCTION
Multi F and Multi F MAX Heat Pump System Engineering Manual
MULTI
F
MAX
MULTI
F
Indoor Units Outdoor Units
Model Type
Indoor Unit
Nominal Capacity
(Btu/h)
LMU183HV LMU243HV LMU303HV LMU363HV LMU481HV LMU541HV LMU601HV
Maximum No. of Connectable Indoor Units
2344888
ART COOL Mirror
9,000OOOOOOO
12,000 O O O O O O O
18,000 - O O O O O O
ART COOL
Gallery
9,000OOOOOOO
12,000 O O O O O O O
Standard Wall
Mounted
7,000OOOOOOO
9,000OOOOOOO
12,000 O O O O O O O
15,000OOOOOOO
18,000 - O O O O O O
24,000 - - O O O O O
Ceiling Concealed
Duct-Low Static
9,000 O O O O O O O
12,000 O O O O O O O
18,000 - O O O O O O
Ceiling Concealed
Duct-High Static
24,000 - - O O O O O
36,000 - - - - O O O
Four-Way Ceiling
Cassette
7,000OOOOOOO
9,000OOOOOOO
12,000 O O O O O O O
18,000 - O O O O O O
Low-Wall Console
9,000OOOOOOO
12,000 O O O O O O O
15,000 O O O O O O O
Vertical-Horizontal
Air Handler
24,000 - - O O O O O
36,000 - - - - O O O
Table 1: Allowable Indoor Unit to 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 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
capacity 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 largest 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.
Branch Distribution Unit (PMBD3620)
+
24 24 + Total Capacity Index = = 48 < 73
Branch Distribution Unit (PMBD3641)
First Indoor Unit:
LMCN128HV
+ + Outdoor Unit: LMU541HV
12 9 36 x 1.3 + + Total Capacity Index = = 67.8 < 73
Acceptable
Combination
Second Indoor Unit:
LSN090HSV5
Third Indoor Unit:
LMVN361HV
Outdoor Unit: LMU601HV
First Indoor Unit:
LMVN241HV
Second Indoor Unit:
LMVN241HV
Acceptable
Combination
Example 1
Example 2
Examples
MANUAL EQUIPMENT
SELECTION PROCEDURE