Correction By Refrigerant Piping Length - Mitsubishi Electric Smart Multi MXZ-SM36NAM-U1 Data Book

7. CAPACITY TABLES

7-4. Correction by refrigerant piping length

CITY MULTI indoor unit 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
MXZ-SM36NAM-U1， MXZ-SM36NAMHZ-U1
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)
MXZ-SM48NAM-U1， MXZ-SM48NAMHZ-U1
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
MXZ-SM36,48NAM-U1 | M XZ-SM36,42,48NAMHZ-U1
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0 50 100 150 200
Piping equivalent length (ft)
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-P0855
Total capacity of indoor unit
21 [kBtu/h]
31.5 [kBtu/h]
42 [kBtu/h]
54.6 [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
Total capacity of indoor unit
250 300 350 400 450 500 550
MXZ-SM42NAMHZ-U1
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
MXZ-SM60NAM-U1
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0 20 40 60 80
MXZ-SM60NAM-U1
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0 20 40 60
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)
80 100 120 140 160 180 200 220
Piping equivalent length (ft)
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
30