18
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Piping installation
Installer and user reference guide
70
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10
18.1.5 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
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
120 m
65 m
Maximum equivalent piping length
(a)
150 m
85 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 m
140 m
Minimum length outdoor-first refrigerant branch kit
▪
Example 2: Limit≤a
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
Maximum length outdoor-BP
▪
Example 2, BP3: a+b≤Limit
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
Indoor unit capacity index=60
N/A
2~12 m
Indoor unit capacity index=71
N/A
2~8 m
Maximum height difference
outdoor-indoor
Outdoor higher than indoor
▪
Examples: H1≤Limit
50 m
30 m
Outdoor lower than indoor
40 m
Maximum height difference indoor-indoor
▪
Examples: H2≤Limit
15 m
15 m
Maximum height difference outdoor-BP
▪
Example 2: H3≤Limit
N/A
30 m
Maximum height difference BP-BP
▪
Example 2: H4≤Limit
N/A
15 m
Maximum height difference BP-indoor
▪
Example 2: H5≤Limit
N/A
5 m
Содержание VRV IV-S RXYSQ4T8VB Series
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