Trane 4TVH0086FE000AA Service Manual page 16

c) Find the correction factor for piping length and level difference ("K1")
Figure 1-5.3: V6-i rate of change in cooling capacity
-100
-110
Notes:
d) Calculate the corrected capacity of 4TVH0192FE000AA ("C") by using K1:
 The corrected capacity 53.8kW is larger than required total heat load 50.7kW, so selection is complete. (In the event
that the corrected capacity is lower than the required total heat load, Step 3 should be repeated from the point
where the outdoor unit capacity is provisionally selected.)
90
80
70
60
50
40
30
20
10
0
10 20 30 40 50 60 70 80
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
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.
C = B × K1 = 60 × 0.898 = 53.8kW
K1 = 0.898
90 100 110 120 130 140 150 160 170 180 190 200
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