Daikin 2MXM68A2V1B9 Manuel D'installation page 12

5 Piping installation
Outdoor unit
3MXM68, 4MXM68
4MXM80
5MXM90
INFORMATION
It is NOT possible to connect only 1 indoor unit. Connect at
least 2 indoor units.
Port Class
2MXM68
A (Ø9.5 mm) 15, 20, 25, 35, (42)
B (Ø12.7mm) 15, 20, 25, 35, (42)
42, 50, 60
3MXM40
A (Ø9.5 mm) 15, 20, 25, 35
B + C (Ø12.7mm) 15, 20, 25, 35
3MXM52
A (Ø9.5 mm) 15, 20, 25, 35, (42)
B + C (Ø12.7mm) 15, 20, 25, 35
42, 50
3MXM68
A (Ø9.5 mm) 15, 20, 25, 35, (42)
B + C (Ø12.7mm) 15, 20, 25, 35, 42
50, 60
4MXM68
A + B (Ø9.5 mm) 15, 20, 25, 35, (42)
C + D (Ø12.7mm) 15, 20, 25, 35, (42)
42, 50, 60
4MXM80
A (Ø9.5 mm) 15, 20, 25, 35, (42)
B (Ø12.7mm) 15, 20, 25, 35, (42)
42, 50, 60
C + D (Ø15.9 mm) 15, 20, 25, 35, (42)
42, 50, 60
71
5MXM90
A + B (Ø9.5 mm) 15, 20, 25, 35, (42)
C (Ø12.7mm) 15, 20, 25, 35, (42)
42, 50, 60
D + E (Ø15.9 mm) 15, 20, 25, 35, (42)
42, 50, 60
71
(a)
Only in case of connection with FTXM42R, FTXM42A, FTXA42C
1 2 3
Reducer type
1
2
3
4
Installation manual
12
Total indoor unit capacity
class
≤11.0 kW
≤14.5 kW
≤15.6 kW
Reducer
(a)
—
(a)
2+4
—
—
2+4
(a)
—
2+4
—
(a)
—
2+4
—
(a)
—
(a)
2+4
—
(a)
—
(a)
2+4
—
(a)
5+6
1+3
—
(a)
—
(a)
2+4
—
(a)
5+6
1+3
—
4 5 6
Connection
Ø15.9 mm → Ø12.7 mm
Ø12.7 mm → Ø9.5 mm
Ø15.9 mm → Ø12.7 mm
Ø12.7 mm → Ø9.5 mm
Reducer type
5
6
Connection examples:
▪ Connecting a Ø12.7 mm pipe to a Ø15.9 mm gas pipe connection
port
b
a
Ø15.9 mm
a Outdoor unit connection port
b Reducer no. 1
c Reducer no. 3
d Flare nut for Ø15.9 mm
e Inter-unit piping
▪ Connecting a Ø9.5 mm pipe to a Ø15.9 mm gas pipe connection
port
a b
Ø15.9 mm
a Outdoor unit connection port
b Reducer no. 6
c Reducer no. 5
d Flare nut for Ø9.5 mm
e Inter-unit piping
▪ Connecting a Ø9.5 mm pipe to a Ø12.7 mm gas pipe connection
port
a b
Ø12.7 mm
a Outdoor unit connection port
b Reducer no. 2
c Reducer no. 4
d Flare nut for Ø12.7 mm
e Inter-unit piping
NOTICE
To prevent gas leakage, apply refrigeration oil for R32
(FW68DA):
▪ Ø9.5 mm → Ø15.9 mm, to both sides of the Reducer 6
(b) AND to the inner surface of the flare.
▪ Ø12.7mm → Ø15.9 mm or Ø9.5 mm → Ø12.7 mm, to
both sides of Reducer 1 or 2 (b).
Flare nut for (mm)
Ø9.5
Ø12.7
Ø15.9
NOTICE
Use an appropriate wrench to avoid damaging the
connection thread by overtightening the flare nut. Be
careful NOT to overtighten the nut, or the smaller pipe may
be damaged (about 2/3~1× the normal torque).
5.2.2 To connect the refrigerant piping to the
outdoor unit
▪ Piping length. Keep field piping as short as possible.
▪ Piping protection. Protect the field piping against physical
damage.
2MXM-A9, 3MXM-A9, 4MXM-A9, 5MXM-A9
Connection
Ø15.9 mm → Ø9.5 mm
Ø15.9 mm → Ø9.5 mm
c e
d
Ø12.7 mm
c d e
Ø9.5 mm
c d e
Ø9.5 mm
Tightening torque (N•m)
33~39
50~60
62~75
R32 Split series
3P774208-3 – 2024.05