Mitsubishi MXZ-8B140VA Technical & Service Manual page 15

4-2-2. Correcting Capacity for Changes in the Length of Refrigerant Piping
To obtain the ratio (and the corrected piping length) of the outdoor units rated capacity and the total in-use indoor capacity, first
find the capacity ratio corresponding to the standard piping length from Fig. 4-5, Fig. 4-6 and then multiply by the capacity from
Fig. 4-1, 4-2, Fig. 4-3, 4-4 to obtain the actual capacity.
(1) Capacity correction factor
Fig. 4-5 Cooling capacity correction curve
MXZ-8B140VA, MXZ-8B140YA
20 40
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
20 40
Corrected piping length (m)
Fig. 4-6 Heating capacity correction curve
MXZ-8B140VA, MXZ-8B140YA, MXZ-8B160VA, MXZ-8B160YA
1
Heating
Capacity
0.95
(ratio) [%]
0.9
(2) Method for Obtaining the Corrected Piping Length
Corrected piping length = (Actual piping length between outdoor unit and the farthest indoor unit) + (0.30 o number of bends in the piping) (m)
OCH480D
60 80
Total rated capacity
of indoor units (kW)
2.2 (15.7%)
7.0 (50%)
10.5 (75%)
14.0 (100%)
18.5 (132%)
60 80
20 40 60
Corrected piping length (m)
MXZ-8B160VA, MXZ-8B160YA
20
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
20
Corrected piping length (m)
80
15
40 60 80
Total rated capacity
of indoor units (kW)
2.5(16%)
7.8 (50%)
11.6 (75%)
15.5 (100%)
20.2 (130%)
40 60 80