Midea MV5-X500W/V2GN1-AU - Page 94

R410A All DC Inverter V5 X Series 50Hz MCAC-VTSM-2015-10
92 Installation
Piping length
Permitted value
Piping
Piping length
Total piping length
≤1000m
(refer to note 1)
L1+(L2+L3+L4+L5+L6+L7+L8+L9+L10+L11+L12)×2
+a+b+c+d+e+f+g+h+i+j+k+l+m
Single piping
length
Actual length
≤175m
L1+L7+L8+L9 +L10+i
Equivalent length
≤200m
(refer to note 2)
Piping length from the first branch joint to the
farthest indoor unit
≤40/90m
(refer to note 3)
L7+L8+L9 +L10+i
Level
difference
Level difference
between indoor
unit and outdoor
unit
Outdoor unit is up
≤90m
(refer to note 4)
/
Outdoor unit is down
≤110m
(refer to note 5)
/
Level difference between indoor units
≤30m
/
Note:
The indoor units should be installed as possible as equal in the both sides of the U-shape branch joint.
1. When counting the total piping length, the actual pipe length branch joints should be double:
Total piping length= L1+(L2+L3+L4+L5+L6+L7+L8+L9)×2+a+b+c+d+e+f+g+h+i+j≤1000m
2. The equivalent length of each branch joint is 0.5m.
3. The allowable piping length from the first branch joint to the farthest indoor unit should be equal to or less than 40m, but when
the following conditions are all met, the allowable length can be extended to 90m.
 The piping length from each indoor unit to the nearest branch joint should be less than 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.
The farthest indoor unit: N10
The nearest indoor unit: N1
(L1+L5+L8+L9+j)-(L1+L2+L3+a) ≤40m
 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＜L5+L8+L9+j≤90m, 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
Φ9.53→Φ12.7
Φ12.7→Φ15.9
Φ15.9→Φ19.1
Φ19.1→Φ22.2
Φ22.2→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
4. When the outdoor unit is higher than indoor units and the level difference is over 20m, it is recommended to set an oil return
bend every 10m in the gas pipe of the main pipe, for specifications of the oil return bend refer to the figure below.
Unit: mm
5. When the outdoor unit is lower than indoor units and the level difference is more than 40m, the liquid pipe of the main pipe
needs to be increased..
≥300mm
≥300mm