Equipment Selection Procedure - LG LC188HHV4 Engineering Manual

Cooling / Heating Correction Factors
For Four-Way Ceiling Cassette systems, calculate the equivalent length of the liquid line from the outdoor unit to the indoor unit. Also,
determine the elevation difference of the indoor unit above or below the outdoor unit. Find corresponding cooling or heating capacity
correction factors as shown below. Multiply the correction factors by the cooling or heating capacity obtained from the capacity table using
design conditions. The resultant is the NET cooling or heating capacity.
Refrigerant Line Length Derates
For air-cooled systems, a capacity correction factor will 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 below.
Table 45:
Piping Length (ft.)
Cooling Capacity Coefficient Factor.
LC188HHV4 (18,000 Btu/h) 100 100 100 100 100 99.4 98.8 98.2 97.5
LC249HHV (24,000 Btu/h) 100 100 100 100 100 99.4 98.8 98.2 97.5
Rate of Capacity
LC369HHV (36,000 Btu/h) 100 100 100 100 100 99.3 98.5 97.8 97.0
Change (%)
LC429HHV (42,000 Btu/h) 100 100 98.8 97.5 96.3 95.1 93.9 92.7 91.5
LC489HHV (48,000 Btu/h) 100 100 98.8 97.5 96.3 95.1 93.9 92.7 91.5
Heating Capacity Coefficient Factor.
LC188HHV4 (18,000 Btu/h) 100 100 100 100 100 99.4 98.8 98.2 97.5
LC249HHV (24,000 Btu/h) 100 100 100 100 100 99.4 98.8 98.2 97.5
Rate of Capacity
LC369HHV (36,000 Btu/h) 100 100 100 100 100 99.3 98.5 97.8 97.0
Change (%)"
LC429HHV (42,000 Btu/h) 100 100 98.8 97.5 96.3 95.1 93.9 92.7 91.5
LC489HHV (48,000 Btu/h) 100 100 98.8 97.5 96.3 95.1 93.9 92.7 91.5
Equivalent Piping Length for Piping Components
Table 46: Equivalent Piping Length for Elbows.
Component
1/4 3/8
Elbow (ft.)
0.5 0.6
Altitude Correction Factor
The impact of air density must be considered on systems installed at a significant altitude above sea level, therefore, locally accepted
altitude correction factors must be applied.

EQUIPMENT SELECTION PROCEDURE

16.4 24.6 32.8 49.2 65.6 82.0 98.4 114.8 131.2 147.6 164 180.4 196.9 213.3 229.7 246
1/2 5/8 3/4
0.7 0.8 1.2
©
Size (Inches)
7/8 1 1-1/8 1-1/4
1.3 1.5 1.6 1.8
96.9 96.3 - - -
96.9 96.3 - - -
96.3 95.5 94.8 94.0 93.3
90.3 89.1 87.9 86.7 85.5
90.3 89.1 87.9 86.7 85.5
96.9 96.3 - -
96.9 96.3 - -
96.3 95.5 94.8 94.0 93.3
90.3 89.1 87.9 86.7 85.5
90.3 89.1 87.9 86.7 85.5
1-3/8 1-1/2 1-5/8 1-3/4
2.0 2.1 2.3 2.5
PERFORMANCE DATA | 59
- -
- -
92.5 91.8
84.3 83.1
84.3 83.1
- -
- -
92.5 91.8
84.3 83.1
84.3 83.1
2-1/8
2.8