20
OCH760
(2) Method for Obtaining the Equivalent Piping Length
Equivalent length = (length of piping to farthest indoor unit) + (0.3
o
number of bends in the piping) (m)
4-4-1. Correction of Heating Capacity for Frost and Defrosting
If heating capacity has been reduced due to frost formation or defrosting, multiply the capacity by the appropriate correction
factor from the following table to obtain the actual heating capacity.
Correction factor diagram
Outdoor Intake temperature (°C W.B.)
6
4
2
0
−2
−4
−6
−8
−10
−15
−20
Correction factor
1.00
0.98
0.89
0.88
0.89
0.90
0.95
0.95
0.95
0.95
0.95
0
20
40
60
80
100
120
140
160
180
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
Capacity ratio
Piping equivalent length (m)
Capacity ratio
25.13
16.75
33.5
43.5
Piping equivalent length (m)
Total capacity of indoor unit
0
20
40
60
80
100
120
140
160
180
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
Figure 13 PUMY-P300YBM <Cooling>
Figure 14 PUMY-P300YBM
<Heating>
