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3
REFRIGERANT PIPING
Tolerance of pipe length and pipe head
Indoor unit B
Indoor unit A
Branch pipe
b
L
Outdoor unit
CAUTION
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.
Piping materials and sizes
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.
Pipe side
Model
(RAV-)
a
110 AT
140 AT
160 AT
H
CAUTION
Ensure that the shortest pipe length complies with the following:
L + b ≥ 5 m
a ≥ b
Model (RAV -)
Gas side
Liquid side
Pipe Length (One Direction)
Difference
of branch
Full length
Branch
piping
piping
length
L + a or
L + b
a, b
b – a, or
a – b
Below
Below
50 m
15 m
Below
(actual
(actual
10 m
length)
length)
Main piping
Branch piping
Main piping
Branch piping
3
Height Difference
Outdoor Unit -
Indoor Unit
H
Between
Outdoor
Outdoor
Unit
Unit
Installed
Installed
Above
Below
Indoor
Indoor
Unit
Unit
Below
Below
30 m
30 m
In parentheses ( ) are wall thickness
110 AT
140 AT, 160 AT
Ø15.9 (1.0)
Ø12.7 (0.8)
Ø15.9 (1.0)
Ø9.5 (0.8)
Ø6.4 (0.8)
Indoor
Remarks
Units
∆h
Below
Less than
0.5 m
10 bends
Ø9.5 (0.8)
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