RZQG71~140L + RZQSG100~140L
Split system air conditioners
4P339538-1A – 2014.03
Installation manual
8
8.3.
Selection of branch pipe
8.4.
Allowable pipe length and height difference
See the table below concerning lengths and heights. Refer to figures
2
,
3
,
4
and
5
. Assume that the longest line in the figure corresponds
with the actual longest pipe, and the highest unit in the figure
corresponds with the actual highest unit.
For RZQG units only
Allowable pipe length
For RZQSG units only
Allowable pipe length
Existing or pre-installed piping can be used
1.
Piping must comply with the criteria below.
• Pipe diameter must comply with the limitations as indicated in
paragraph
"8.2. Refrigerant pipe size" on page 7
.
• Piping length must be within limits of the allowable piping
length as in paragraph
"8.4. Allowable pipe length and height
difference" on page 8
.
• Piping must be designed for R410A. See paragraph
"8.1. Selection of piping material" on page 7
.
2.
Piping can be reused without cleaning when:
• Total 1-way piping length: <50 m.
• No compressor breakdown has occurred in the history of the
unit to be replaced.
• A correct pump down operation can be executed:
-
Operate the unit continuously for 30 minutes in cooling
mode.
-
Execute a pump down operation.
-
Remove the air conditioning units to be replaced.
• Check the contamination inside the existing piping.
If you cannot meet all these requirements, the existing pipes
must be cleaned or replaced after removing the air conditioning
units to be replaced.
3.
Prepare the flare connections for higher pressure. See
paragraph
"10.3. Cautions for necessity of a trap" on page 12
.
RZQ(S)G71~
FCQG35~71F/FCQHG71F
Twin
KHRQ22M20TA
KHRQ58T
Triple
KHRQ127H
KHRQ58H
Double twin
KHRQ22M20TA (3x)
KHRQ58T (3x)
Allowable pipe length
Liquid pipe
size
Model
71
100
125
140
Maximum total one-way piping length
(a)
(a) Parenthesized figure represents the equivalent length.
Pair
L1
size-down
10 m (10 m)
standard
50 m
(70 m)
75 m (90 m)
size-up
25 m
(35 m)
35 m (45 m)
• Twin and triple
• Double twin
• L1+L2
• L1+L2+
L4
size-down
15 m (10 m)
standard
50 m
(70 m)
75 m (90 m)
size-up
25 m
(35 m)
35 m (45 m)
Minimum total one-way piping length
All
L1+L2+L3
+L4+L5+
L6+L7
—
3 m
(b)
(b) When piping length is less than 5 m, a complete recharging of the unit is
required. See paragraph
"Total charging weight of the refrigerant (after a
leak, etc.)" on page 15
.
Maximum allowable piping length
Twin
L1+L2+L3
—
60 m
75 m
75 m
Triple
L1+L2+L3
+L4
—
Double twin
L1+L2+L3
+L4+L5+
L6+L7
—
Maximum branch piping length
• Twin and triple
• Double twin
• L2
• L2+L4
—
20 m
Maximum difference between branch lengths
Twin
L2–L3
—
10 m
10 m
10 m
Triple
L2–L4
—
Double twin
• L2–L3
• L4–L5
• L6–L7
• (L2+L4)–
(L3+L7)
—
Maximum height between indoor and outdoor
All
H1
—
30 m
Maximum height between indoors
Twin, triple and
double twin
H2
—
0.5 m
Chargeless length
All
L1+L2+L3
+L4+L5+
L6+L7
size-down
≤
10 m
standard
≤
30 m
size-up
≤
15 m
Allowable pipe length
Liquid pipe
size
Model
100
125
140
Maximum total one-way piping length
(a)
(a) Parenthesized figure represents the equivalent length.
Pair
L1
size-down
10 m (10 m)
standard
50 m (70 m)
size-up
25 m (35 m)
• Twin and triple
• Double twin
• L1+L2
• L1+L2+L4
size-down
10 m (10 m)
standard
50 m (70 m)
size-up
25 m (35 m)
Minimum total one-way piping length
All
L1+L2+L3+L4+L5+
L6+L7
—
5 m
Maximum allowable piping length
Twin
L1+L2+L3
—
50 m
50 m
Triple
L1+L2+L3+L4
Double twin
L1+L2+L3+L4+L5+
L6+L7
—
Maximum branch piping length
• Twin and triple
• Double twin
• L2
• L2+L4
—
20 m
Maximum difference between branch lengths
Twin
L2–L3
—
10 m
10 m
Triple
L2–L4
Double twin
• L2–L3
• L4–L5
• L6–L7
• (L2+L4)–(L3+L7)
—
Maximum height between indoor and outdoor
All
H1
—
30 m
Maximum height between indoors
Twin, triple and
double twin
H2
—
0.5 m
Chargeless length
All
L1+L2+L3+L4+L5+
L6+L7
size-down
≤
10 m
standard
≤
30 m
size-up
≤
15 m
