Mitsubishi Heavy Industries FDT100VNVF1 Technical Manual page 159

Limitation on unit and piping installation - triple.
Triple type
(In case of 140V 200V)
•
Descriptions
One-way pipe length
Main pipe length
Piping length between the first branching point and the second branching point
One-way pipe length between the first branching point and indoor units
One-way pipe length from the first branching point to indoor units through the second branching point
Piping length difference from the first branching point to indoor unit
One-way pipe length difference from the second branching point to indoor unit
Elevation difference between indoor and outdoor units
Elevation difference among indoor units
Triple type
(incase of 250V)
Restrictions
One-way pipe length
Main pipe length
One-way pipe length between the first branching point from to the second branching point
One-way pipe length between the first branching point and indoor units
Piping length difference from the first branching point to indoor unit
Elevation difference between indoor and outdoor units
Elevation difference among indoor units
Triple type A
Indoor unit
L2
H
L1
L (riser)
Outdoor unit
(1) A riser pipe must be part of the main.
A branching pipe set should be installed horizontally at a point as close to an indoor unit as possible.
(2) Reduce refrigerant amount by 1.0kg from the factory charge when refrigerant piping is shorter than 3m.
One-way pipe length difference from the first branching point to the indoor unit
Model for outdoor units
140V
φ9.52
Liquid piping
φ12.7
200V
φ25.4 or φ28.58
Gas piping
φ22.22
140V
φ9.52
Liquid piping
φ12.7
200V
φ25.4 or φ28.58
Gas piping
φ22.22
When the outdoor unit is positioned higher
When the outdoor unit is positioned lower
One-way pipe length difference from the first branching point to the indoor unit
Model for outdoor units
φ22.22
Gas piping
φ25.4 or φ28.58
φ22.22
Gas piping
φ25.4 or φ28.58
When the outdoor unit is positioned higher
When the outdoor unit is positioned lower
Triple type B
h1
h3
Indoor unit
h2
H
L1
L3
Outdoor unit
Dimensional limitations
≦ 50m
≦ 40m
≦ 70m
L+L1, L+L2, L+L3
≦ 35m
≦ 50m
≦ 40m
≦ 70m
≦ 35m
≦ 5m
≦ 30m
≦ 27m
< 3m
L1-L2, L1-L3, L2-L3
3m ≦ , ≦ 10m
≦ 10m
≦ 30m
≦ 15m
≦ 0.5m
Dimensional restrictions
≦ 35m
L+L1, L+La+L2, L+La+L3
≦ 70m
≦ 35m
≦ 70m
≦ 5m
≦ 30m
L1, La+L2, La+L3
L1-(La+L2), L1-(La+L3)
< 3m
L2-L3, L3-L2
≦ 30m
≦ 15m
≦ 0.5m
Indoor unit
h1
h3
Indoor unit
h2
L3
L2
Second Branch
La
Triple type
First Branch
L (riser)
Model for
outdoor units
140V
200V 250V
•
Marks appearing in the drawing
< 3m ≧ 3m
Triple type A Triple type B
L+L1+L2+L3 L+La+L1+L2+L3
※ 1
L+L1
L L
La
※ 1
L1, L2, L3 L1
La+L2, La+L3
L1-(La+L2), L1-(La+L3)
L2-L3, L3-L2
H H
h1, h2, h3 h1, h2, h3
Marks appearing in the drawing
< 3m ≧ 3m
Triple type B
※ 2
L
La
Prohibltion of use
※ 2
※ 2
H
h1, h2, h3
※ 1 Install the indoor units so that L+L1
becomes the longest one-way pipe.
Keep the pipe length difference between
L1 and (La+L2) or (La+L3) within 10m.
※ 2 Connect the unit that is the maximum
capacity with L1.
Branch piping set(option)
Type A Type B
Branch pipe First Branch Second Branch
DIS-TA1 DIS-WA1 DIS-WA1
DIS-TB1 DIS-WB1 DIS-WA1
※ 1
※ 1
※ 1