VC Pro VRF 50/60Hz
109
Part 2 - Outdoor Unit Engineering Data
8.2 Capacity Correction Factors for Piping Length and Level Difference
Figure 2-8.1: Rate of change in cooling capacity
Notes:
1. The horizontal axis shows equivalent length of piping between farthest indoor unit and first outdoor branch joint; the vertical axis shows the largest level
difference between indoor unit and outdoor unit. For level differences, positive values indicate that the outdoor unit is above the indoor unit, negative values
indicate that the outdoor unit is below the indoor unit.
2. These figures illustrate the rate of change in capacity of a system with only standard indoor units at maximum load (with the thermostat set to maximum)
under standard conditions. Under partial load conditions there is only a minor deviation from the rate of change in capacity shown in these figures.
3. The capacity of the system is either the total capacity of the indoor units obtained from indoor unit capacity tables or the corrected capacity of the outdoor
units as per the calculations below, whichever is smaller.
Corrected capacity of
outdoor units
Capacity of outdoor units obtained from outdoor unit
capacity tables at the combination ratio
Capacity
correction factor
90
-90
-100
-110
80
-80
70
-70
60
-60
50
-50
40
-40
30
-30
20
-20
10
1.0
0.97
0.95
0.92
0.90
0.87
0.85
0.84
0.81
0.80
0.78
0.78
0.77
0.76
1.0
0.97
0.95
0.92
0.90
0.87
0.85
0.84
0.81
0.80
0.78
0.78
0.77
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
-10
0
0
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