Mitsubishi Electric PUMY-P36NKMU4 Technical & Service Manual page 34

Figure 17 PUMY-P36NKMU4
PUMY-P48NKMU4
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0
Figure 18 PUMY-P60NKMU4
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0
(2) Method for Obtaining the Equivalent Piping Length
Equivalent length = (length of piping to farthest indoor unit) + (0.99 × number of bends in the piping) (ft)
4-5-1. 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)>
Correction factor
OCH811A
PUMY-HP36NKMU2
PUMY-HP42NKMU2
PUMY-HP48NKMU2
50 100 150 200
Piping equivalent length (ft)
<Heating>
20 40 60 80 100
Piping equivalent length (ft)
43(6) 37(4) 36(2)
1.00 0.98 0.89
<Heating>
250 300 350 400
120 140 160 180
32(0) 28(−2) 25(−4) 21(−6) 18(−8) 14(−10) 5(−15) −4(−20) −13(−25)
0.88 0.89 0.90 0.95
34
450 500 550 600
200 220 240 260
0.95 0.95 0.95 0.95 0.95