To Connect The Refrigerant Piping To The Outdoor Unit - Daikin 3MXM40A2V1B Installation Manual

5 Piping installation
Outdoor unit
4MXM80
5MXM90
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.
1 2 3
Reducer type
1
2
3
4
5
6
Installation manual
12
Total indoor unit capacity
class
≤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
Ø15.9 mm → Ø9.5 mm
Ø15.9 mm → Ø9.5 mm
Connection examples:
▪ Connecting a Ø12.7 mm pipe to a Ø15.9 mm gas pipe connection
port
a b
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
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
a Outdoor unit connection port
b Reducer no. 2
c Reducer no. 4
d Flare nut for Ø12.7 mm
e Inter-unit piping
Coat the threaded connection port of the outdoor unit where the flare
nut comes in with refrigeration oil.
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.
WARNING
Connect the refrigerant piping securely before running the
compressor. If the refrigerant piping is NOT connected and
the stop valve is open when the compressor is run, air will
be sucked in. This will cause abnormal pressure in the
refrigeration cycle, which may result in equipment damage
and even injury.
c d e
c d e
c d e
Tightening torque (N•m)
33~39
50~60
62~75
2MXM-A, 3MXM-A, 4MXM-A, 5MXM-A
R32 Split series
3P600450-6M – 2021.12