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34 | duct (HIgH StatIc)
Ceiling-Concealed Duct (High Static) System Engineering Manual
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.
Cooling / Heating Correction Factors
For
Ceiling-Concealed Duct (High Static)
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 result is the NET cooling or heating capacity.
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.
Table 21:
Cooling Capacity Coefficient Factor.
Equivalent Piping Length for Piping Components
Piping Length (ft.)
16.4
32.8
49.2
65.6
98.4
131.2
164.0
196.9
229.7
246.0
Rate of Capacity
Change (%)
LH247HV (24,000 Btu/h)
100
99.3
97.9
96.6
93.8
91.1
88.4
-
-
-
LH367HV (36,000 Btu/h)
100
99.3
97.9
96.6
93.8
91.1
88.4
85.6
82.9
81.5
Table 22:
Heating Capacity Coefficient Factor.
Piping Length (ft.)
16.4
32.8
49.2
65.6
98.4
131.2
164.0
196.9
229.7
246.0
Rate of Capacity
Change (%)
LH247HV (24,000 Btu/h)
100
99.7
99.2
98.7
97.7
96.6
95.6
-
-
-
LH367HV (36,000 Btu/h)
100
99.7
99.2
98.7
97.7
96.6
95.6
94.6
93.5
93.0
Table 23: Equivalent Piping Length for Elbows.
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
equiPment SeleCtion ProCedure
Summary of Contents for LH247HV
Page 29: ... Cooling Capacity Data on page 30 Heating Capacity Data on page 32 PERFORMANCE DATA ...
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