LG MULTI F Engineering Manual page 177

F
MULTI
F
MULTI MAX
Using the System Combination Tables
Multi F system combination tables illustrate how each indoor unit receives a percentage of total outdoor unit rated capacity. Allocation is
based on:
• Combinations of Non-Ducted Indoor Units
• Combinations of Ducted Indoor Units
• Combinations of Mixed Non-Ducted and Ducted Indoor Units
Multi F MAX system combination tables only show the total connected indoor unit capacity, but individual indoor unit capacity can be
calculated using the formula:
Qidu(combi) = Qodu(rated) x Qidu(rated)
ΣQidu(rated)
A more accurate method to determine expected capacity would be to apply the outdoor unit's corrected capacity instead of rated capacity.
Capacity Coefficient Factors
Refrigerant Line Length Derates
For air-cooled systems, a capacity correction factor may have to be applied to account for the length of the system's refrigerant pipe. Rate of
change in capacity due to increased piping lengths is shown in Table 99, Table 100, and Table 101.
Table 99: Multi F Outdoor Unit (Multiple Piping) to Indoor Unit Refrigerant Line Length Derates.
Piping Length (feet)
7,000 Btu/h Indoor Unit Models
25.0
32.8
49.2
65.6
82.0
9,000 Btu/h Indoor Unit Models
25.0
32.8
49.2
65.6
82.0
12,000 Btu/h Indoor Unit Models
25.0
32.8
49.2
65.6
82.0
15,000 Btu/h Indoor Unit Models
25.0
32.8
49.2
65.6
82.0
18,000 Btu/h Indoor Unit Models
25.0
32.8
49.2
65.6
82.0
24,000 Btu/h Indoor Unit Models
25.0
32.8
49.2
65.6
82.0
EQUIPMENT SELECTION PROCEDURE
Cooling Capacity (%)
Due to our policy of continuous product innovation, some specifications may change without notification.
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100.0
98.4
95.8
93.2
90.6
100.0
98.0
94.8
91.6
88.4
100.0
97.6
93.8
89.9
86.1
100.0
97.2
93.0
88.8
84.6
100.0
98.6
96.4
94.1
91.9
100.0
98.2
95.4
92.4
89.6
Heating Capacity (%)
100.0
99.2
97.8
96.4
95.0
100.0
99.0
97.4
95.8
94.2
100.0
98.6
96.4
94.1
91.9
100.0
98.2
95.4
92.6
89.8
100.0
99.6
99.0
98.3
97.7
100.0
99.2
98.0
96.6
95.4
APPLICATION GUIDELINES | 177