Correcting Capacity For Changes In The Length Of Refrigerant Piping; Capacity Correction Factor; Heating Capacity Correction Curve - Mitsubishi Electric MXZ-8A140VA Technical & Service Manual

5-2-2. 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.3, Fig.4 and then multiply by the capacity from
Fig.1-1, 1-2, Fig.2-1, 2-2 to obtain the actual capacity.

(1) Capacity correction factor

Fig.3 Cooling capacity correction curve
1.00
0.95
0.90
Cooling
0.85
Capacity
(ratio)
0.80
[%]
0.75
0.70
0.65
Corrected piping length (m)
Fig.4 Heating capacity correction curve
1
Heating
Capacity
0.95
(ratio)
[%]
0.9
Corrected piping length (m)
(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)
20 40 60
20 40 60
20 40 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%)
80
80
29