54-EN
53-EN
– 27 –
Do NOT turn on power to FS units and SV units until following work is completed.
If power turned off after turned it on, valves of the FS units and SV units will close and there is risk of air entering
the refrigerant piping.
• Connection of refrigerant pipe
• Airtightness test
• Vacuum drying
• Adding refrigerant
If power turned on before the work is completed, keep power on while working.
WARNING
•
If the refrigerant gas leaks during installation, ventilate the room.
If the leaked refrigerant gas comes into contact with
fi
re, noxious gas may be generated.
•
After installation, check that the refrigerant gas does not leak.
If the refrigerant gas leaks into the room and comes into contact with
fi
re such as a fan heater, stove, or
kitchen range, noxious gas may be generated.
Connection of refrigerant pipe
• The refrigerant pipe connecting section is set in the
outdoor unit. Remove the front panel and the piping/
wiring panel. (M5: 8 pcs.)
• As shown in the illustration on the right, the hooks
are at the right and left sides of the front panel. Lift
up and remove the front panel.
• Pipes can be drawn out forward or downward from
the outdoor unit.
• When drawing out the pipe forward, draw it out to
the outside via the piping/wiring panel, and leave
a space of 500 mm or more from the main pipe
connecting the outdoor unit with the indoor unit,
considering service work or other work on the unit.
(For replacing the compressor, 500 mm or more
space is required.)
• When drawing out the pipe downward, remove the
knockouts on the base plate of the outdoor unit,
draw the pipes out of the outdoor unit, and perform
piping on the right/left or rear side.
• Do not apply any load to the pipes.
Liquid pipe
Liquid pipe
Suction gas pipe
Gas pipe
HP/LP gas pipe
No use
(Keep closed)
For Heat Pump System Installation
For Heat Recovery System Installation
REQUIREMENT
• For a welding work of the refrigerant pipes, be sure to use nitrogen gas in order to prevent oxidation of the inside
of the pipes; otherwise clogging of the refrigerating cycle due to oxidized scale may occur.
• Use clean and new pipes for the refrigerant pipes and perform piping work so that water or dust does not
contaminate the refrigerant.
Pipe connection method of valve (Example)
•
Heat recovery system]
[(A)Valve side piping diameter
→
(B) Main piping diameter]
Model name
Liquid
HP/LP gas
Suction gas
(A)
(B)
MMY-SUG0801*
Ø12.7
→
Ø12.7
Ø19.1
→
Ø15.9
پ
)
Ø25.4
→
Ø19.1
پ
)
MMY-SUG1001*
Ø19.1
→
Ø19.1
Ø25.4
→
Ø22.2
پ
)
MMY-SUG1201*
MMY-SUG1401*
Ø19.1
→
Ø19.1
Ø25.4
→
Ø28.6
پ
)
MMY-SUG1601*
Ø15.9
→
Ø15.9
Ø19.1
→
Ø22.2
پ
)
MMY-SUG1801*
MMY-SUG2001*
MMY-SUG2201*
MMY-SUG2401*
•
Heat pump system
Model name
Liquid
Gas
No use
MMY-SUG0801*
Ø12.7
→
Ø12.7
Ø19.1
→
Ø19.1
-
MMY-SUG1001*
Ø19.1
→
Ø22.2
پ
)
-
MMY-SUG1201*
MMY-SUG1401*
Ø19.1
→
Ø28.6
پ
)
-
MMY-SUG1601*
Ø15.9
→
Ø15.9
Ø19.1
→
Ø28.6
پ
)
MMY-SUG1801*
MMY-SUG2001*
MMY-SUG2201*
MMY-SUG2401*
پ
)
Connect the piping procured locally different diameter sockets.
Hook
Front panel
Piping/wiring panel
(Rear piping)
(Right piping)
Drawing out
downward
(Right
piping)
(Left
piping)
Drawing out forward
500 mm or
more
(Left piping)
8
Refrigerant piping
