Midea MV8M-120WV2RN1 Engineering Data page 68

V8 Mini R410A VRF 50Hz
3.4 Selecting Piping Diameters
Tables 3-3.4 to 3-3.7 below, specify the required pipe diameters for the indoor and outdoor piping. The main pipe (L1) and
first indoor branch joint (A) should be sized according to whichever of Tables 3-3.4 and 3-3.5 indicates the larger size.
Figure 3-3.3: Selecting piping diameters
Maximum equivalent piping length from the outdoor
unit to the farthest indoor unit is ≤ 120 m
L 1
Table 3-3.4: Main pipe (L1) and first indoor branch joint (A)
Total equivalent length of liquid pipe and gas pipe< 90m
Outdoor unit
model
Gas pipe (mm)
120 Φ15.9
140 Φ15.9
160 Φ19.1
Table 3-3.5: Indoor main pipes (L2 to L5) and indoor branch joint kits
Total capacity indexes of indoor units
Capacity indexes < 160
160 ≤ Capacity indexes < 280
Notes:
1. If indoor main pipes (L2 to L5) are larger than the main pipe (L1), indoor main pipes should reduce to the main pipe's size.
Table 3-3.6: Indoor auxiliary pipes (a to f)
Capacity of indoor unit
(A×100W)
A<63
63≤A≤160
66
L 2
A
First branch
joint
Legend
L1
L2 to L5
a to f
A to E
Liquid pipe (mm)
Φ9.52
Φ9.52
Φ9.52
Gas pipe (mm) Liquid pipe (mm)
Φ12.7 Φ6.35
Φ15.9 Φ9.52
B
Maximum piping length from the first branch joint
to the farthest indoor unit is ≤ 40 m
L 3 L 4
C
L 5
Main pipe
Indoor main pipes
Indoor auxiliary pipes
Indoor branch joints
Total equivalent length of liquid pipe and gas pipe ≥ 90m
Branch joint kit Gas pipe (mm)
FQZHN-01D Φ19.1
FQZHN-01D Φ19.1
FQZHN-01D Φ22.2
Gas pipe (mm) Liquid pipe (mm)
Φ15.9
Φ19.1
Table 3-3.7: Pipe diameter of the outdoor unit itself
Outdoor unit model
120/140
160
N1
a
N
b
N 3
c
D
N 4
d
E
f
e
N 5
N 6
Liquid pipe (mm)
Φ9.52
Φ9.52
Φ9.52
Branch joint kit
Φ9.52 FQZHN-01D
Φ9.52 FQZHN-01D
Gas pipe (mm)
Φ15.9
Φ19.1
2
Branch joint kit
FQZHN-01D
FQZHN-01D
FQZHN-01D
Liquid pipe (mm)
Φ9.52
Φ9.52