Daikin VRV 5-S Series - 18.1.5 Piping Length and Height Difference

18 | Piping installation
Installer and user reference guide
80
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1 – 2020.01
18.1.5 Refrigerant piping length and height difference
The piping lengths and height differences must comply with the following
requirements.
Requirement Limit
Maximum actual piping length
▪ Example 1, unit8: a+b+c+d+e+f+g+p≤Limit
▪ Example 2, unit6: a+b+h≤Limit
▪ Example 2, unit8: a+i+k≤Limit
▪ Example 3, unit8: a+i≤Limit
120m
Maximum equivalent piping length
(a)
150m
Maximum total piping length
▪ Example 1: a+b+c+d+e+f+g+h+i+j+k+l+m+n+p≤Limit
300m
Maximum length first branch kit-indoor unit
▪ Example 1, unit8: b+c+d+e+f+g+p≤Limit
▪ Example 2, unit6: b+h≤Limit
▪ Example 2, unit8: i+k≤Limit
▪ Example 3, unit8: i≤Limit
40m
Maximum height difference
outdoor-indoor
Outdoor higher than indoor
▪ Examples: H1≤Limit
50m
Outdoor lower than indoor 40m
(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).
a
A
h i j k l m n
B C D E F G
pb c d e f
1 2 3 4 5 6 7
8
g
H1
H2
18‒1 Example 1: in case of refnet joints only
Refnet joint
1~8 VRVDX indoor units
a
b
c d e f
i
k
j
g h
A B
1 2 3 4 5 6
7 8
H1
H2
18‒2 Example 2: in case of refnet joints and header
Refnet joint
Refnet header
1~8 VRVDX indoor units
a
c
b d e f
i
g h
1 2 3 4 5 6 7
8
H1
H2
18‒3 Example 3: in case of refnet header only
Refnet header