Design of 3WAY VRF SYSTEM
2
- 13
1
2
3
4
5
6
7
8
1. Model Selecting and Capacity Calculator
Refer to the graph below for the correction coeffi cients for Ruc and Ruh.
Indoor unit capacity correction coefficient for Ruc (cooling)
Indoor unit capacity correction coefficient for Ruh (heating)
1.0
0.9
0.8
0.7
0.6
0.5
0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0
Indoor unit capacity correction coef
ficient
Corrected indoor/outdoor capacity ratio (Ruc or Ruh)
NOTE
When Ruc or Ruh is less than or equal to 1.0, the indoor unit capacity correction coefficient for both Ruc and Ruh is 1.0.
Outdoor unit cooling capacity characteristics
Rate of cooling capacity change (%)
23
32
41
50
59
68
77
86
95
104 113
80
90
100
110
120
Outdoor unit heating capacity characteristics
Rate of heating capacity change (%)
-4
5
14
23
32
41
50
59
40
50
60
70
80
90
100
110
120
5. Graph of capacity correction coefficients
Graph of outdoor unit capacity characteristics (1 – (2))
Outdoor air intake temp. (°F DB)
Outdoor air intake temp. (°F WB)
Outdoor unit heating capacity correction coeffi cient during frosting/defrosting (1 – (4))
Outdoor intake air
temp.
(°FWB RH85%)
– 4
5
14
17
21
23
24
28
30
32
33
35
37
39
41
42
Correction coefficient
0.97
0.97
0.97
0.96
0.94
0.91
0.89
0.87
0.87
0.87
0.88
0.89
0.91
0.92
0.95
1.0
*
To calculate the heating capacity with consideration for frosting/defrosting operation, multiply the heating capacity found
from the capacity graph by the correction coeffi cient from the table above.
TD831158-00̲3WAY̲VRF̲SYS.indb 13
TD831158-00̲3WAY̲VRF̲SYS.indb 13
2012/01/23 17:30:12
2012/01/23 17:30:12
