Installation manual

RZQG71~140L + RZQSG100~140L7V1+Y1B(9)
Split system air conditioners
4P327537-1 – 2012.08
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 criter
ia below.
• Pipe diameter must comply with the limit
ations as indicated in
paragraph "8.2. Refrigerant pipe size" on page 7.
• Piping length must be within limit
s 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 r
eused without cleaning when:
• Total 1-way piping length: <50 m.
• No compressor breakdown has occurred in the history of the
unit to be re
placed.
• 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 insid
e the existing piping.
If you cannot meet all these requir
ements, the existing pipes
must be cleaned or replaced after removing the air conditioning
units to be replaced.
3. Prep
are the flare connections for higher pressure. See
paragraph "10.3. Cautions for necessity of a trap" on page 12.
RZQ(S)G71~140L7Y1B(9)+
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
(3
5 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
(3
5 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
d
ouble 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
d
ouble 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