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Refrigerant piping
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)
Type
Pipe diameter
Draw-out forward
Draw-out downward
Liquid
Gas
MUP080
12.7
19.1
Cut the L-shaped pipe at the horizontal
straight section, then braze the socket and
pipe procured locally.
Liquid pipe
Gas pipe
Pipe
Section to
be cut
socket
Cut the L-shape pipe at the vertical straight
section, then braze the socket and pipe
procured locally.
Liquid pipe
Gas pipe
Pipe
15 mm
Section to
be cut
socket
MUP100
12.7
22.2
MUP120
12.7
28.6
Cut the L-shaped pipe at the horizontal
straight section, then braze the socket and
pipe procured locally.
Liquid pipe
Gas pipe
Pipe
Section to
be cut
socket
Cut the L-shape pipe at the vertical straight
section, then braze the socket and pipe
procured locally.
Liquid pipe
Gas pipe
Pipe
15 mm
Section to
be cut
socket
MUP140
15.9
28.6
MUP160
MUP180
MUP200
15.9
28.6
Cut the L-shaped pipe at the horizontal
straight section, then braze the socket and
pipe procured locally.
Liquid pipe
Gas pipe
Pipe
Section to
be cut
socket
Cut the L-shape pipe at the vertical straight
section, then braze the socket and pipe
procured locally.
Liquid pipe
Gas pipe
Pipe
15 mm
Section to
be cut
socket
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.
Packed
valve of
liquid
side
Ball valve of
gas side
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)
