5 Preparation
Installer reference guide
11
RZQG71~Y1 + RZQSG100~Y1
Split system air conditioners
4P385522-1A – 2016.10
Refrigerant piping length and height difference
The piping lengths and height differences must comply with the following requirements:
Requirement
Limit
RZQG
RZQSG
71
100
125+140
100
125+140
1 Minimum total
one‑way piping length
Pair: Limit≤L1
Twin: Limit≤L1+L3
Triple: Limit≤L1+L4
Double twin: Limit≤L1+L3+L7
3 m
(a)
5 m
2 Maximum total
one‑way piping length
Pair: L1≤Limit
Ø size-down
10 m (10 m)
(b)
10 m (10 m)
(b)
Ø standard
50 m (70 m)
(b)
75 m (90 m)
(b)
50 m (70 m)
(b)
Ø size-up
25 m (35 m)
(b)
35 m (45 m)
(b)
25 m (35 m)
(b)
Twin and triple: L1+L2≤Limit
Double twin: L1+L2+L4≤Limit
Ø size-down
10 m (15 m)
(b)
10 m (10 m)
(b)
Ø standard
50 m (70 m)
(b)
75 m (90 m)
(b)
50 m (70 m)
(b)
Ø size-up
25 m (35 m)
(b)
35 m (45 m)
(b)
25 m (35 m)
(b)
3 Maximum allowable
piping length
Pair: N/A
—
—
Twin: L1+L2+L3≤Limit
60 m
75 m
50 m
Triple: L1+L2+L3+L4≤Limit
—
75 m
50 m
Double twin: L1+L2+L3+L4+L5+L6+L7≤Limit
—
75 m
—
50 m
4 Maximum branch
piping length
Pair: N/A
Twin and triple: L2≤Limit
Double twin: L2+L4≤Limit
20 m
20 m
5 Maximum difference
between branch
lengths
Pair: N/A
—
—
Twin: L2–L3≤Limit
10 m
10 m
Triple: L2–L4≤Limit
—
10 m
10 m
Double twin:
▪ L2–L3≤Limit
▪ L4–L5≤Limit
▪ L6–L7≤Limit
▪ (L2+L4)–(L3+L7)≤Limit
—
10 m
—
10 m
6 Maximum height
between indoor and
outdoor
Pair, twin, triple and double twin: H1≤Limit
30 m
30 m
7 Maximum height
between indoors
Pair: N/A
Twin, triple and double twin: H2≤Limit
0.5 m
0.5 m
(a)
When piping length is <5 m, a complete recharge of the unit is required.
(b)
Parenthesised figure represents the equivalent length.
Example
If the system layout is as follows…
Then the requirements are…
▪ RZQG125
▪ Triple:
L2
L3
L4
H1
H2
L1
▪ Ø standard
1
3 m≤L1+L4
2
L1+L2≤75 m (90 m)
3
L1+L2+L3+L4≤75 m
4
L2≤20 m
5
L2–L4≤10 m
6
H1≤30 m
7
H2≤0.5 m
