44 | PERFORMANCE DATA
Single Zone High Efficiency Standard W
all Mount Engineering Manual
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Cooling / Heating Correction Factors
For Single Zone High Efficiency Standard Wall Mounted 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
tables using design conditions. The resultant is the corrected cooling or heating capacity.
EQUIPMENT SELECTION PROCEDURE
Correction 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 below.
Cooling Capacity Coefficient Factors
Heating Capacity Coefficient Factors
Table 20:
Single Zone High Efficiency Standard Wall Mounted Unit Cooling Capacity Coefficient Factors.
Table 21:
Single Zone High Efficiency Standard Wall Mounted Unit Heating Capacity Coefficient Factors.
Piping Length (ft.)
16.4
24.6
32.8
49.2
65.6
82.0
98.4
114.8 131.2 147.6 164.0
Rate of
Capacity
Change (%)
LSU090HSV5 (9,000 Btu/h)
100
100
98.2
94.6
91.1
87.5
-
-
-
-
-
LSU120HSV5 (12,000 Btu/h)
100
100
98.2
94.6
91.1
87.5
-
-
-
-
-
LSU180HSV5 (18,000 Btu/h)
100
100
99.1
97.3
95.5
93.6
91.8
90.0
-
-
-
Piping Length (ft.)
16.4
24.6
32.8
49.2
65.6
82.0
98.4
114.8 131.2 147.6 164.0
Rate of
Capacity
Change (%)
LSU090HSV5 (9,000 Btu/h)
100
100
99.1
97.3
95.6
93.8
-
-
-
-
-
LSU120HSV5 (12,000 Btu/h)
100
100
99.1
97.3
95.6
93.8
-
-
-
-
-
LSU180HSV5 (18,000 Btu/h)
100
100
99.5
98.6
97.7
96.8
95.9
95.0
-
-
-
Equivalent Piping Length for Piping Components
Component
Size (Inches)
Elbow (ft.)
1/4
3/8
1/2
5/8
3/4
7/8
1
1-1/8
1-1/4
1-3/8
1-1/2
1-5/8
1-3/4
2-1/8
0.5
0.6
0.7
0.8
1.2
1.3
1.5
1.6
1.8
2.0
2.1
2.3
2.5
2.8
Table 22: Equivalent Piping Length for Elbows.
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 using ASHRAE guidelines must be applied.
