– 3 –
2
REFRIGERANT PIPING
When planning a layout for Units A and B, comply with the following:
1. The lengths after branching (“a” and “b”) should be equal if feasible. Install Units A and B so that the difference of the
branching lengths becomes less than 10m if the lengths cannot be equal due to the branch pipe position.
2. Install Units A and B on the same level. If Units A and B cannot be installed on the same level, the difference in level should
be limited to 0.5 m or less.
3. Be certain to install Units A and B in the same room. Units A and B cannot be operated independently each other.
Use copper tube of Copper and copper alloy seamless pipes and tubes, with 40 mg/10 m or less in the amount of oil stuck on
inner walls of pipe and 0.8 mm in pipe wall thickness for diameters 6.4, 9.5 and 12.7 mm and 1.0 mm, for diameter 15.9 mm.
Never use pipes of thin wall thickness such as 0.7 mm.
In parentheses ( ) are wall thickness
Tolerance of pipe length and pipe head
CAUTION
Piping materials and sizes
T
A
0
6
1
,
T
A
0
4
1
T
A
0
1
1
)
-
V
A
R
(
l
e
d
o
M
Pipe side
Gas side
)
0
.
1
(
9
.
5
1
Ø
g
n
i
p
i
p
n
i
a
M
Branch piping
Ø12.7 (0.8)
Ø15.9 (1.0)
Liquid side
)
8
.
0
(
5
.
9
Ø
g
n
i
p
i
p
n
i
a
M
Branch piping
Ø6.4 (0.8)
Ø9.5 (0.8)
a
b
L
H
Δ
h
Ensure that the shortest pipe length complies with the following:
L + b
≥
5 m
a
≥
b
Model
(RAV-)
Pipe Length (One Direction)
Height Difference
Remarks
Full length
L + a or
L + b
Branch
piping
a, b
Difference
of branch
piping
length
b – a, or
a – b
Outdoor Unit -
Indoor Unit
H
Between
Indoor
Units
Δ
h
Outdoor
Unit
Installed
Above
Indoor
Unit
Outdoor
Unit
Installed
Below
Indoor
Unit
110 AT
140 AT
160 AT
Below
50 m
(actual
length)
Below
15 m
(actual
length)
Below
10 m
Below
30 m
Below
30 m
Below
0.5 m
Less than
10 bends
CAUTION
80 AT
Indoor unit B
Indoor unit A
Branch pipe
Outdoor unit
T,
A
0
8
EN
