Correcting Capacity For Changes In The Length Of Refrigerant Piping - Mitsubishi Electric MXZ-8B48NA 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 Max. 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
Fig. 4 Heating capacity correction curve
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), (ft)
20 40 60
20 40 60
70 130 195
Corrected piping length
20 40 60
70 130 195
Corrected piping length
80
Total rated capacity of indoor units (kBTU/h)
9 (11.1%)
27 (50%)
40.5 (75%)
54.0 (100%)
70.2 (130%)
80 (m)
260 (ft)
80 (m)
260 (ft)
32