Engineering Manual

B-126
Figure 17 MXZ-4C36NAHZ/5C42NAHZ/8C48NA <Heating>
Figure 18 MXZ-8C60NA <Heating>
(2) Method for Obtaining the Equivalent Piping Length
Equivalent length for type P60 = (length of piping to farthest indoor unit) + (0.3 x number of bends in the piping) (m)
Length of piping to farthest indoor unit: type P60.....80 m
6-4-1. 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 <W.B.°F (°C)>
43(6) 39(4) 36(2) 32(0) 28(−2) 25(−4) 21(−6) 18(−8) 14(−10) 5(−15) −4(−20) −13(−25)
Correction factor
1.0 0.98 0.89 0.88 0.89 0.9 0.95 0.95 0.95 0.95 0.95 0.95
0 20 40 60 80 100 120 140 160 180 200 220 240 260
0.70
0.75
0.80
0.85
0.90
0.95
1.00
Total capacity of indoor unit
Capacity ratio
Piping equivalent length (ft)
0 20 40 60 80 100 120 140 160 180 200 220 240 260
0.70
0.75
0.80
0.85
0.90
0.95
1.00
Total capacity of indoor unit
Capacity ratio
Piping equivalent length (ft)