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Piping installation
Installer reference guide
34
2MXM-A9, 3MXM-A9, 4MXM-A9, 5MXM-A9
R32 Split series
4P600463-7G – 2022.09
Pipe outer diameter (Ø
p
) Insulation inner diameter
(Ø
i
)
Insulation thickness (t)
12.7 mm (1/2")
14~16 mm
≥13 mm
15.9 mm (5/8")
16~20 mm
≥13 mm
Ø
i
Ø
i
t
Ø
p
Ø
p
If the temperature is higher than 30°C and the humidity is higher than RH 80%, the
thickness of the insulation materials should be at least 20 mm to prevent
condensation on the surface of the insulation.
Use separate thermal insulation pipes for the gas and liquid refrigerant piping.
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.
Shortest allowable length per room is 3 m.
Outdoor unit
Refrigerant piping length to
each indoor unit
Refrigerant piping total
length
2MXM68, 3MXM40,
3MXM52, 3MXM68
≤25 m
≤50 m
4MXM68
≤60 m
4MXM80
≤70 m
5MXM90
≤75 m
INFORMATION
In case of combination of the outdoor unit 3MXM40 or 3MXM52 with the indoor
units CVXM-A and/or FVXM-A, the total liquid refrigerant piping length MUST be
≤30 m.
CVXM-A9, FVXM-A9 is without this limitation.
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
