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Piping installation
Installer reference guide
35
3(A)MXM+3(A)MXF+4MXM+5MXM
R32 Split series
4P600463-1C – 2020.08
7.1.3 Refrigerant piping length and height difference
INFORMATION
For the Hybrid for Multi application and the DHW generator for Multi, see the indoor
unit installation manual for the maximum allowable refrigerant piping length and
height difference.
The shorter the refrigerant piping, the better the performance of the system.
The piping length and height differences must comply with the following
requirements.
Model
Minimum required space
2MXM68, 3MXM40, 3MXM52,
3AMXM52, 3MXF52, 3AMXF52
4.7 m
2
3MXM68, 3MXF68
5.5 m
2
4MXM68
6.5 m
2
4MXM80
9.8 m
2
5MXM90
10.4 m
2
Shortest allowable length per room is 3 m.
Outdoor unit
Refrigerant piping length to
each indoor unit
Refrigerant piping total
length
2MXM68, 3MXM40,
3MXM52,
3AMXM52,
3MXM68, 3MXF52,
3AMXF52, 3MXF68,
≤25 m
≤50 m
4MXM68
≤60 m
4MXM80
≤70 m
5MXM90
≤75 m
INFORMATION
In case of combination of the outdoor unit 3MXM40N8 or 3MXM52N8 with the
indoor units CVXM-A and/or FVXM-A, the total liquid refrigerant piping length MUST
be ≤30 m.
Height difference
outdoor-indoor
Height difference indoor-
indoor
Outdoor unit installed
higher than indoor unit
≤15 m
≤7.5 m
Outdoor unit installed
lower than at least 1
indoor unit
≤7.5 m
≤15 m
