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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 36:
Piping Length (ft.)
Cooling Capacity Coefficient Factor
LC098HV4 (9,000 Btu/h)
Rate of Capacity
Change (%)
LC128HV4 (12,000 Btu/h)
Heating Capacity Coefficient Factor
LC098HV4 (9,000 Btu/h)
Rate of Capacity
Change (%)
LC128HV4 (12,000 Btu/h)
Table 37:
Piping Length (ft.)
Cooling Capacity Coefficient Factor.
LC188HV4 (18,000 Btu/h)
LC248HV (24,000 Btu/h)
Rate of Capacity
Change (%)
LC368HV (36,000 Btu/h)
LC428HV (42,000 Btu/h)
Heating Capacity Coefficient Factor.
LC188HV4 (18,000 Btu/h)
LC248HV (24,000 Btu/h)
Rate of Capacity
Change (%)"
LC368HV (36,000 Btu/h)
LC428HV (42,000 Btu/h)
Equivalent Piping Length for Piping Components
Table 38: 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
24.6
32.8
100
99.7
100
99.7
100
99.7
100
99.7
24.6
32.8
100
100
100
100
100
100
100
100
100
99.3
100
99.3
100
99.7
100
99.7
1/2
5/8
3/4
0.7
0.8
1.2
©
49.2
65.6
98.4
99.2
98.7
-
99.2
98.7
-
99.2
98.7
-
99.2
98.7
-
49.2
65.6
98.4
99.3
97.9
96.6
99.3
97.9
96.6
99.3
97.9
96.6
99.3
97.9
96.6
97.9
96.6
9..8
97.9
96.6
9..8
99.2
98.7
97.7
99.2
98.7
97.7
Size (Inches)
7/8
1
1-1/8
1-1/4
1.3
1.5
1.6
1.8
Correction Factors
131.2
164.0
196.9
229.7
-
-
-
-
-
-
-
-
-
-
-
-
131.2
164
196.9
229.7
93.8
91.1
-
93.8
91.1
-
93.8
91.1
88.4
85.6
93.8
91.1
88.4
85.6
91.1
88.4
-
91.1
88.4
-
96.6
95.6
94.6
93.5
96.6
95.6
94.6
93.5
1-3/8
1-1/2
1-5/8
2.0
2.1
2.3
PERFORMANCE DATA | 57
246.0
-
-
-
-
-
-
-
-
246
-
-
-
-
82.9
82.9
-
-
-
-
93.0
93.0
1-3/4
2-1/8
2.5
2.8
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