Instruction of the GMV D.C. inverter
8
4.3 Allowable Length and Drop Height of Connecting Pipe
GMV-Pd100W/NaB-K, GMV- Pd120W/NaB-K, GMV- Pd140W/NaB-K, GMV- Pd160W/NaB-
K,GMV-Pd140W/NaB-M,GMV-Pd160W/NaB-M
Allowable Value Fitting Pipe
Total length (actual length) of tting pipe 150m L1+L2+L3+a+b+c+d
Length of farthest tting 
pipe (m)
Actual length 70m
L1+L2+L3+d
Equivalent length 80m
Equivalent length from the 1st manifold pipe 
to farthest tting pipe (m)
25m L2+L3+d
Height difference 
between outdoor unit 
and indoor unit
Outdoor unit at 
upper
30m ——
Outdoor unit at 
lower
25m ——
Height difference between indoor units (m) 10m ——
Height difference between indoor unit and 
outdoor unit: 
H
≤
30m
The 1st 
branch section
Equivalent length of farthest pipe: L
≤80m
The equivalent length of the farthest pipe from the 1st branch: L
≤25m
The equivalent length is designed based on every 0.5m for each Y-type branch pipe
Outdoor unit
Indoor unit
Indoor unit
Height difference 
between indoor units:  
H
≤
10m
a
d
c
b
L1
L2
L3