Correction By Refrigerant Piping Length - Mitsubishi Electric CITY MULTI PUMY-P48NKMU4 Data Book

7. CAPACITY TABLES

7-4. Correction by refrigerant piping length

CITY MULTI systems can have extended piping lengths if certain limitations are followed, but cooling/heating capacity could be
reduced. Using following correction factor by equivalent piping length shown at 7-4-1 and 7-4-2, capacity can be found.
7-4-3 shows how to obtain the equivalent piping length.
7-4-1. Cooling capacity correction
PUMY-P36NKMU4, PUMY-HP36NKMU2
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0 50 100 150 200 250
Piping equivalent length (ft)
PUMY-P48NKMU4, PUMY-HP48NKMU2
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0 50 100 150 200 250
Piping equivalent length (ft)
7-4-2. Heating capacity correction
PUMY-P36, 48NKMU4, PUMY-HP36, 42, 48NKMU2
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0 50 100 150 200
7-4-3. How to obtain the equivalent piping length
Equivalent length [m]= (Actual piping length to the farthest indoor unit) + (0.30 x number of bends in the piping)
Equivalent length [ft.]= (Actual piping length to the farthest indoor unit) + (0.99 x number of bends in the piping)
M-P0891A
Total capacity of indoor unit
18 [kBtu/h]
27 [kBtu/h]
36 [kBtu/h]
46.8 [kBtu/h]
300 350 400 450 500 550 600
Total capacity of indoor unit
24 [kBtu/h]
36 [kBtu/h]
48 [kBtu/h]
62.4 [kBtu/h]
300 350 400 450 500 550 600
250 300 350 400 450 500 550
PUMY-HP42NKMU2
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0 50 100 150 200
PUMY-P60NKMU4
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0 20 40 60 80
PUMY-P60NKMU4
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0 20 40 60 80
600
Total capacity of indoor unit
250 300 350 400 450 500 550
Piping equivalent length (ft)
Total capacity of indoor unit
100 120 140 160 180 200 220 240
Piping equivalent length (ft)
100 120 140 160 180 200 220
S-Series
21 [kBtu/h]
31.5 [kBtu/h]
42 [kBtu/h]
54.6 [kBtu/h]
600
30 [kBtu/h]
45 [kBtu/h]
60 [kBtu/h]
78 [kBtu/h]
260
240 260
25