Midea VRF V4 Plus I Series - Indoor Unit Branch Pipe Selection; Indoor Unit Main Pipe Selection; Pipe Name; Refrigerant Piping Selection

R410A DC Inverter VRF V4 Plus Individual Series 50Hz MCAC-VTSM-2014-04
72 Installation
Increasing size as the following:
Φ9.5→Φ12.7 Φ12.7→Φ15.9 Φ15.9→Φ19.1 Φ19.1→Φ22.2 Φ 22.2→Φ25.4 Φ25.4→Φ28.6
Φ28.6→Φ31.8 Φ31.8→Φ38.1 Φ38.1→Φ41.3 Φ41.3→Φ44.5 Φ44.5→Φ54.0
 When counting the total piping length, the actual length of above distribution pipes must be doubled. (Expect the main pipe
and the distribution pipes): Total piping length=1+(L2+L3+L4+L5+L6+L7+L8+L9)×2+a+b+c+d+e+f+g+h+i+j≤1000m
 The length from the indoor unit to the nearest branch joint assembly or MS≤40m.a,b,c,d,e,f,g,h,I,j≤40m
 The length difference between (the outdoor unit to the farthest indoor unit) and (the outdoor unit to the nearest indoor unit) ≤
40m. [(L1+L5+L8+L9+j)-(L1+L2+L3+a)]≤40m
7.3 Refrigerant piping selection
 Pipe name
Main pipe
L1
Indoor unit main pipe
L2, L3, L4, L5, L6
Indoor unit branch pipe
a, b, c, d, e, f, g
Indoor unit branch pipe assembly
A, B, C, D, E, F
 Table1: Indoor unit branch pipe selection (a~i)
Capacity of indoor unit
(A×100W)
Branching pipe length≤10m
Branching pipe length≥10m
Gas side
Liquid side
Gas side
Liquid side
A≤45
Φ12.7
Φ6.4
Φ15.9
Φ9.5
A≥56
Φ15.9
Φ9.5
Φ19.1
Φ12.7
 Table 2: Indoor unit main pipe selection (L1~L8)
Capacity of indoor unit
(A×100W)
Indoor unit main pipe (mm)
Gas side
Liquid side
Available branching pipe
A<166
Φ15.9
Φ9.5
FQZHN-01D
166≤A<230
Φ19.1
Φ9.5
FQZHN-01D
230≤A<330
Φ22.2
Φ9.5
FQZHN-02D
330≤A<460
Φ28.6
Φ12.7
FQZHN-03D
460≤A<660
Φ28.6
Φ15.9
FQZHN-03D