Trane 4TVH0086FE000AA Service Manual page 15

Table 1-5.5: Extract from Table 1-5.2 Combinations of Indoor and outdoor units
Outdoor unit capacity
kW
50.0
56.0
61.5
67.0
73.0
78.5
85.0
90.0
 The number of connected indoor units is 8 and the maximum number of connected indoor units on the 20HP
outdoor unit is 33, so the number of connected indoor units is within the limitation.
 Calculate the corrected capacity of the outdoor unit:
a) The sum of the indoor unit CIs is 706 and the CI of the 20HP outdoor unit (4TVH0192FE000AA) is 560, so the
combination ratio is 706 / 560 = 126%.
b) Using the outdoor unit's cooling capacity table, interpolate to obtain the capacity ("B") corrected for outdoor
air temperature, indoor air temperature, and combination ratio. Refer to Tables 1-5.6 and 1-5.7.
Table 1-5.6: Extract from Table 2-8.7 4TVH0192FE000AA
cooling capacity
Outdoor
CR
temp.
(°C DB)
130%
120%
connected indoor units (standard
Capacity
HP
index
18 500
20 560
22 615
24 670
26 730
28 785
30 850
32 900
Indoor air temp.
(°C DB / °C WB)
air
25.8 / 18.0
TC
kW
31 61.3
33 60.4
35 59.5
31 60.2
33 59.3
35 58.4
Sum of capacity indexes of
indoor units only)
250 to 650
280 to 728
307.5 to 799.5
335 to 871
365 to 949
392.5 to 1020.5
425 to 1105
450 to 1170
Table 1-5.7:
interpolation
CR
PI
kW
14.33
14.88 130%
15.46
13.88
14.44 120%
15.00
Notes:
1. 59.3 + (60.4 – 59.3) × (126 – 120) / (130 – 120) = 60.
14
Maximum number of
connected indoor
units
29
33
36
39
43
46
50
53
Cooling capacity calculated
Indoor air temp.
Outdoor
(°C DB / °C WB)
air
25.8 / 18.0
temp.
TC
(°C DB)
kW
33 60.4
B = 60
1
33 59.3
by
PI
kW
14.88
14.44