Selection Of Branch Pipe; Allowable Pipe Length And Height Difference - Daikin RZQG71L7V1B Installation Manual

8.3.

Selection of branch pipe

Twin KHRQ22M20TA
Triple KHRQ127H
Double twin KHRQ22M20TA (3x)
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
Allowable pipe length
Liquid pipe
Maximum total one-way piping length
Pair L1 size-down
standard
size-up
• Twin and triple • L1+L2 size-down
• Double twin • L1+L2+
L4 standard
size-up
Minimum total one-way piping length
All L1+L2+L3
+L4+L5+ —
L6+L7
Maximum allowable piping length
Twin L1+L2+L3
Triple L1+L2+L3
+L4
Double twin L1+L2+L3
+L4+L5+
L6+L7
Maximum branch piping length
• Twin and triple • L2
• Double twin • L2+L4
Maximum difference between branch lengths
Twin L2–L3
Triple L2–L4
Double twin • L2–L3
• L4–L5
• L6–L7
• (L2+L4)–
(L3+L7)
Maximum height between indoor and outdoor
All H1
Maximum height between indoors
Twin, triple and H2
double twin
Chargeless length
All L1+L2+L3 size-down
+L4+L5+
standard
L6+L7
size-up
(a) Parenthesized figure represents the equivalent length.
(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.
RZQG71~140L + RZQSG100~140L7V1+Y1B(9)
Split system air conditioners
4P327537-1 – 2012.08
RZQ(S)G71~140L7Y1B(9)+
FCQG35~71F/FCQHG71F
KHRQ58T
KHRQ58H
KHRQ58T (3x)
Model
size 71 100 125
(a)
10 m (10 m)
50 m
75 m (90 m)
(70 m)
25 m
35 m (45 m)
(35 m)
15 m (10 m)
50 m
75 m (90 m)
(70 m)
25 m
35 m (45 m)
(35 m)
(b)
3 m
60 m
75 m
—
— 75 m
—
— 20 m
10 m
10 m
—
— 10 m
—
— 30 m
— 0.5 m
≤10 m
≤30 m
≤15 m
For RZQSG units only

Allowable pipe length
Maximum total one-way piping length
Pair
• Twin and triple
• Double twin
Minimum total one-way piping length
All
Maximum allowable piping length
Twin
140
Triple
Double twin
Maximum branch piping length
• Twin and triple
• Double twin
Maximum difference between branch lengths
Twin
Triple
Double twin
Maximum height between indoor and outdoor
All
Maximum height between indoors
Twin, triple and
double twin
Chargeless length
All
(a) Parenthesized figure represents the equivalent 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
• Piping length must be within limits of the allowable piping
length as in paragraph
difference" on page
• Piping must be designed for R410A. See paragraph
"8.1. Selection of piping material" on page
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
Allowable pipe length
Liquid pipe
size
(a)
L1 size-down
standard
size-up
• L1+L2 size-down
• L1+L2+L4
standard
size-up
L1+L2+L3+L4+L5+
—
L6+L7
L1+L2+L3
L1+L2+L3+L4
—
L1+L2+L3+L4+L5+
L6+L7
• L2
—
• L2+L4
L2–L3
L2–L4
—
• L2–L3
• L4–L5
• L6–L7
• (L2+L4)–(L3+L7)
H1 —
H2
—
L1+L2+L3+L4+L5+ size-down
L6+L7
standard
size-up
"8.2. Refrigerant pipe size" on page
"8.4. Allowable pipe length and height
8.
Model
100 125 140
10 m (10 m)
50 m (70 m)
25 m (35 m)
10 m (10 m)
50 m (70 m)
25 m (35 m)
5 m
50 m
50 m
—
20 m
10 m
10 m
—
30 m
0.5 m
≤10 m
≤30 m
≤15 m
7.
7.
12.
Installation manual
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