Connecting The Refrigerant Piping; Connections Between Outdoor And Indoor Unit Using Reducers - Daikin R32 Split Series Installation Manual

Outdoor unit Refrigerant piping
length to each indoor
unit
2MXM68, ≤25 m
3MXM40,
3MXM52,
3AMXM52,
3MXM68,
3MXF52,
3AMXF52,
3MXF68,
4MXM68
4MXM80
5MXM90
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
Outdoor unit installed ≤15 m
higher than indoor
unit
Outdoor unit installed ≤7.5 m
lower than at least 1
indoor unit
5.2

Connecting the refrigerant piping

DANGER: RISK OF BURNING/SCALDING
CAUTION
▪ No brazing or welding on site for units with R32
refrigerant charge during shipment.
▪ During installation of the refrigeration system, joining of
parts with at least one part charged shall be performed
taking into account the following requirements:
ð inside occupied spaces non permanent joints are not
allowed for R32 refrigerant except for site made joints
directly connecting the indoor unit to piping. Site made
joints directly connecting piping to indoor units shall
be of non permanent type.
CAUTION
Do NOT connect the embedded branch piping and the
outdoor unit when only carrying out piping work without
connecting the indoor unit in order to add another indoor
unit later.
WARNING
▪ Only use R32 as refrigerant. Other substances may
cause explosions and accidents.
▪ R32 contains fluorinated greenhouse gases. Its global
warming potential (GWP) value is 675. Do NOT vent
these gases into the atmosphere.
▪ When charging refrigerant, ALWAYS use protective
gloves and safety glasses.
2MXM68+3(A)MXM+3(A)MXF+4MXM+5MXM
R32 Split series
3P600450-1D – 2020.08
5.2.1
Refrigerant piping
total length
≤50 m
Total indoor unit capacity class that can be connected to this
outdoor unit:
≤60 m
Outdoor unit
≤70 m
≤75 m
2MXM68
3MXM40
3MXM52, 3AMXM52, 3MXF52,
3AMXF52
3MXM68, 4MXM68, 3MXF68
4MXM80
Height difference
5MXM90
indoor-indoor
≤7.5 m
Port
2MXM68
A (Ø9.5 mm)
≤15 m
B (Ø12.7mm)
3MXM40
A (Ø9.5 mm)
B + C (Ø12.7mm)
3MXM52, 3AMXM52
A (Ø9.5 mm)
B + C (Ø12.7mm)
3MXM68
A (Ø9.5 mm)
B + C (Ø12.7mm)
3MXF52, 3AMXF52, 3MXF68
A (Ø9.5 mm)
B + C (Ø12.7mm)
4MXM68
A + B (Ø9.5 mm)
C + D (Ø12.7mm)
4MXM80
A (Ø9.5 mm)
B (Ø12.7mm)
C + D (Ø15.9 mm)
5MXM90
A + B (Ø9.5 mm)
C (Ø12.7mm)
D + E (Ø15.9 mm)
5 Piping installation
Connections between outdoor and indoor
unit using reducers
INFORMATION
▪ For the DHW generator for Multi use the same reducer
as for the 20 class indoor unit.
▪ For the Hybrid for Multi, see the indoor unit installation
manual for the capacity class and applicable reducer.
Total indoor unit capacity
class
≤10.2 kW
≤7.0 kW
≤9.0 kW
≤11.0 kW
≤14.5 kW
≤15.6 kW
Class
15, 20, 25, 35, (42)
15, 20, 25, 35, (42)
42, 50, 60
15, 20, 25, 35
15, 20, 25, 35
15, 20, 25, 35, (42)
15, 20, 25, 35
42, 50
15, 20, 25, 35, (42)
15, 20, 25, 35, 42
50, 60
20, 25, 35
20, 25, 35
15, 20, 25, 35, (42)
15, 20, 25, 35, (42)
42, 50, 60
15, 20, 25, 35, (42)
15, 20, 25, 35, (42)
42, 50, 60
15, 20, 25, 35, (42)
42, 50, 60
71
15, 20, 25, 35, (42)
15, 20, 25, 35, (42)
42, 50, 60
15, 20, 25, 35, (42)
42, 50, 60
71
Reducer
(a)
—
(a)
2+4
—
—
2+4
(a)
—
2+4
—
(a)
—
2+4
—
—
2+4
(a)
—
(a)
2+4
—
(a)
—
(a)
2+4
—
(a)
5+6
1+3
—
(a)
—
(a)
2+4
—
(a)
5+6
1+3
—
Installation manual
13