To Select Refrigerant Branch Kits; Refrigerant Piping Length And Height Difference - Daikin VRV IV-S Installer And User Manual

5 Preparation
E: Piping between BP unit and RA DX indoor unit
Indoor unit capacity Piping outer diameter size (mm)
index
Gas pipe
15~42
50
60
71
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)
8+10
12
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
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
Maximum equivalent piping length
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
Minimum length outdoor-first refrigerant branch kit
▪ Example 2: Limit≤a
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
Maximum length outdoor-BP
▪ Example 2, BP3: a+b≤Limit
Minimum and maximum length
BP-indoor
▪ Example 2, unit 18: Min.≤m≤Max.
Installer and user reference guide
14
Liquid pipe
9.5 6.4
12.7
9.5
15.9
Refrigerant branch kit
KHRQ22M29T9
KHRQ22M64T
(a)
Indoor unit capacity index<60
Indoor unit capacity index=60
Indoor unit capacity index=71
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
<200
200≤x<290
290≤x<390
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
<200
200≤x<290
290≤x<390
INFORMATION
Maximum 8 branches can be connected to a header.
RXYSQ8 RXYSQ10
VRV DX RA DX VRV DX
100 m 80 m 120 m
130 m 100 m 150 m
300 140 m 300 m
N/A 5 m N/A
40 m 40 m 40 m
N/A 55 m N/A
N/A 2~15 m N/A
N/A 2~12 m N/A
N/A 2~8 m N/A
Refrigerant branch kit
KHRQ22M20T
KHRQ22M29T9
KHRQ22M64T
Refrigerant branch kit
KHRQ22M29H
KHRQ22M64H
Limit
RXYSQ12
RA DX VRV DX RA DX
80 m 120 m 80 m
100 m 150 m 100 m
140 m 300 m 140 m
5 m N/A 5 m
40 m 40 m 40 m
55 m N/A 55 m
2~15 m N/A 2~15 m
2~12 m N/A 2~12 m
2~8 m N/A 2~8 m
RXYSQ8~12TMY1B
VRV IV-S system air conditioner
4P404225-1B – 2016.03