Refrigerant Piping Length And Height Difference - Daikin RXYSQ6T8VB Installer And User Manual

5 Preparation
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
<182
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
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.
Maximum height difference outdoor-indoor Outdoor higher than indoor
Maximum height difference indoor-indoor
▪ Examples: H2≤Limit
Maximum height difference outdoor-BP
▪ Example 2: H3≤Limit
Maximum height difference BP-BP
▪ Example 2: H4≤Limit
Maximum height difference BP-indoor
▪ Example 2: H5≤Limit
(a) Assume equivalent piping length of refnet joint=0.5 m and refnet header=1 m (for calculation purposes of equivalent piping length, not for
refrigerant charge calculations).
Installer and user reference guide
14
Refrigerant branch kit
KHRQ22M20T
Requirement
(a)
Indoor unit capacity index<60
Indoor unit capacity index=60
Indoor unit capacity index=71
▪ Examples: H1≤Limit
Outdoor lower than indoor
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
<182
INFORMATION
Maximum 8 branches can be connected to a header.
VRV DX
120 m
150 m
300 m
N/A
40 m
N/A
N/A
N/A
N/A
50 m
40 m
15 m
N/A
N/A
N/A
Refrigerant branch kit
KHRQ22M29H
Limit
RA DX
65 m
85 m
140 m
5 m
40 m
55 m
2~15 m
2~12 m
2~8 m
30 m
15 m
30 m
15 m
5 m
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1 – 2017.04