Daikin VRV IV-S - To Select Refrigerant Branch Kits; Refrigerant Piping Length and Height Difference

5 Preparation
Installer and user reference guide
14
RXYSQ8~12TMY1B
VRV IV-S system air conditioner
4P404225-1B – 2016.03
E: Piping between BP unit and RA DX indoor unit
Indoor unit capacity
index
Piping outer diameter size (mm)
Gas pipe Liquid pipe
15~42 9.5 6.4
50 12.7
60 9.5
71 15.9
5.3.4 To select refrigerant branch kits
For piping example, refer to "5.3.3 To select the piping size" on
page13.
Refnet joint at first branch (counting from outdoor unit)
When using refnet joints at the first branch counted from the outdoor
unit side, choose from the following table in accordance with the
capacity of the outdoor unit. Example: Refnet joint A→B‑1.
Outdoor unit capacity type
(HP)
Refrigerant branch kit
8+10 KHRQ22M29T9
12 KHRQ22M64T
Refnet joints at other branches
For refnet joints other than the first branch, select the proper branch
kit model based on the total capacity index of all indoor units
connected after the refrigerant branch. Example: Refnet joint
B‑1→C‑1.
Indoor unit capacity index Refrigerant branch kit
<200 KHRQ22M20T
200≤x<290 KHRQ22M29T9
290≤x<390 KHRQ22M64T
Refnet headers
Concerning refnet headers, choose from the following table in
accordance with the total capacity of all the indoor units connected
below the refnet header.
Indoor unit capacity index Refrigerant branch kit
<200 KHRQ22M29H
200≤x<290
290≤x<390 KHRQ22M64H
INFORMATION
Maximum 8 branches can be connected to a header.
5.3.5 Refrigerant piping length and height difference
The piping lengths and height differences must comply with the following requirements. Two patterns will be discussed:
• Outdoor with 100% VRVDX indoor units
• Outdoor with 100% RADX indoor units
Requirement Limit
RXYSQ8 RXYSQ10 RXYSQ12
VRVDX RADX VRVDX RADX VRVDX RADX
Maximum actual piping length
▪ Example 1.1, unit8: a+b+c+d+e+f+g+p≤Limit
▪ Example 1.2, unit6: a+b+h≤Limit
▪ Example 1.2, unit8: a+i+k≤Limit
▪ Example 1.3, unit8: a+i≤Limit
▪ Example 2, unit18: a+b+m≤Limit
100m 80m 120m 80m 120m 80m
Maximum equivalent piping length
(a)
130m 100m 150m 100m 150m 100m
Maximum total piping length
▪ Example 1.1: a+b+c+d+e+f+g+h+i+j+k+l+m+n+p≤Limit
▪ Example 2: a+b+c+d+e+f+g+h+i+j+k+l+m≤Limit
300 140m 300m 140m 300m 140m
Minimum length outdoor-first refrigerant branch kit
▪ Example 2: Limit≤a
N/A 5m N/A 5m N/A 5m
Maximum length first branch kit-indoor unit
▪ Example 1.1, unit8: b+c+d+e+f+g+p≤Limit
▪ Example 1.2, unit6: b+h≤Limit
▪ Example 1.2, unit8: i+k≤Limit
▪ Example 1.3, unit8: i≤Limit
▪ Example 2, unit18: b+m≤Limit
40m 40m 40m 40m 40m 40m
Maximum length outdoor-BP
▪ Example 2, BP3: a+b≤Limit
N/A 55m N/A 55m N/A 55m
Minimum and maximum length
BP-indoor
▪ Example 2, unit 18: Min.≤m≤Max.
Indoor unit capacity index<60 N/A 2~15m N/A 2~15m N/A 2~15m
Indoor unit capacity index=60 N/A 2~12m N/A 2~12m N/A 2~12m
Indoor unit capacity index=71 N/A 2~8m N/A 2~8m N/A 2~8m