MCAC-VTSM-2015-09 R410A All DC Inverter V4+S Series 60Hz
Installation 91
The length difference between (the outdoor unit to the farthest indoor unit) and (the outdoor unit to the nearest indoor unit)
≤40m (131ft).
The farthest indoor unit: N10
The nearest indoor unit: N1
(L1+L5+L8+L9+j)-(L1+L2+L3+a) ≤40m (131ft)
Increase the pipe diameter between the first branch joint and the last branch joint. (Please change the pipe diameter at field) If
the pipe diameter of the main slave pipe is the same as the main pipe, then it is no need for increase.
When: 40m (131ft)＜L5+L8+L9+j≤90m (295ft), L2, L3, L4, L5, L6, L7, L8, L9 need to be increased.
If pipe diameter needs to be increased please use the following chart: unit mm (in.)
Φ28.6(Φ1-1/8)→
Φ31.8(Φ1-1/4)
Φ31.8(Φ1-1/4)→
Φ38.1(Φ1-1/2)
Φ38.1(Φ1-1/2)→
Φ41.3(Φ1-5/8)
Φ41.3(Φ1-5/8)→
Φ44.5(Φ1-3/4)
Φ44.5(Φ1-3/4)→
Φ54(Φ2-1/8)
4. When the outdoor unit is higher than indoor units and the level difference is over 20m (65.6ft), it is recommended to set an oil
return bend every 10m (32.8ft) in the gas pipe of the main pipe, for specifications of the oil return bend refer to the figure below.
Unit: mm (in.)
5. When the outdoor unit is lower than indoor units and the level difference is more than 131ft(40m), the liquid pipe of the main
pipe needs to be increased..
3.2 Refrigerant piping selection
Pipe name
L2, L3, L4, L5, L6, L7, L8, L9
Indoor unit auxiliary pipe (from indoor unit to the nearest branch joint)
a, b, c, d, e, f, g, h, i, j
Indoor unit branch joint assembly
A, B, C, D, E, F, G, H, I
Outdoor unit branch joint assembly
N1
(140)
N3
(140)
N5
(140)
N6
(71)
N7
(71)
N9
(56)
N8
(140)
N2
(140)
N4
(140)
N10
(56)
A
B
E
F
H
G
I
C
D
L1
L2
L3
L4
L5
L6
L8
L9
L7
a b
c
d
e f
g
i
j
h
W3
(10)
W2
(14)
W1
(16)
M
L
g1 g2 g3
G1
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