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6-7. Tolerance of Pipe Length and Pipe Head
n Twin system
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 0.5m 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.
Total length (L + a or L + b)
Pipe length
Branch pipe length (a, b)
(one way)
Maximum difference between indoor units
Refrigerant pipe
(b – a, or a - b)
specification
Height
Between indoor units ( ∆ h)
Between indoor unit When outdoor unit heigher (H)
difference
and outdoor unit When outdoor unit lower (H)
Number of bent portions
50 m
15 m
10 m
0.5 m
30 m
30 m
10 m or less
Indoor unit B
Indoor unit A
Distributor
b
Branch pipe
a
Branch pipe
H
L
Main pipe
∆h
Outdoor unit