Refrigerant Piping Length And Height Difference - Daikin 2MXM68A2V1B Installer's Reference Manual

7 | Piping installation

7.1.3 Refrigerant piping length and height difference

Installer reference guide
34
Pipe outer diameter (Ø
12.7 mm (1/2")
15.9 mm (5/8")
Ø Ø
i i
Ø Ø
p p
t
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.
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
2MXM68, 3MXM40,
3MXM52, 3MXM68
4MXM68
4MXM80
5MXM90
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.
Outdoor unit installed
higher than indoor unit
Outdoor unit installed
lower than at least 1
indoor unit
) Insulation inner diameter
p
(Ø )
i
14~16 mm
16~20 mm
≤25 m
Height difference
outdoor-indoor
≤15 m
≤7.5 m
Insulation thickness (t)
≥13 mm
≥13 mm
Refrigerant piping total
length
≤50 m
≤60 m
≤70 m
≤75 m
Height difference indoor-
indoor
≤7.5 m
≤15 m
2MXM-A, 3MXM-A, 4MXM-A, 5MXM-A
R32 Split series
4P600463-5E – 2021.12