5 Piping installation
Installation manual
16
2MXM-A9, 3MXM-A9, 4MXM-A9, 5MXM-A9
R32 Split series
3P600450-9T – 2022.09
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.
5.2.1
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 that can be connected to this
outdoor unit:
1
2
3
4
5
6
Reducer type
Connection
1
Ø15.9 mm → Ø12.7 mm
2
Ø12.7 mm → Ø9.5 mm
3
Ø15.9 mm → Ø12.7 mm
4
Ø12.7 mm → Ø9.5 mm
5
Ø15.9 mm → Ø9.5 mm
6
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
d
e
c
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
d
e
c
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
d
e
c
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)
Tightening torque (N•m)
Ø9.5
33~39
Ø12.7
50~60
Ø15.9
62~75
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.
1
Connect the liquid refrigerant connection from the indoor unit to
the liquid stop valve of the outdoor unit.
b
c
a
c
a
Liquid stop valve
b
Gas stop valve
c
Service port
2
Connect the gas refrigerant connection from the indoor unit to
the gas stop valve of the outdoor unit.
NOTICE
It is recommended that the refrigerant piping between
indoor and outdoor unit is installed in a ducting or the
refrigerant piping is wrapped with finishing tape.
5.3
Checking the refrigerant piping
5.3.1
To check for leaks
NOTICE
Do NOT exceed the unit's maximum working pressure (see
"PS High" on the unit name plate).
Summary of Contents for 2MXM68A2V1B9
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