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7
Refrigerant piping
WARNING
If the refrigerant gas leaks during installation, ventilate the room.
If the leaked refrigerant gas comes into contact with fire, 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 fire 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
19.7" (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, 19.7" (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.
17-EN
(Left
(Right
(Rear piping)
piping)
piping)
(Left piping)
Drawing out
downward
Packed
valve of
Ball valve of
liquid
gas side
side
– 9 –
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)
Pipe diameter
Type
Liquid
MUP0721H
MUP072H1
(12.7)
MUP0961H
(12.7)
Hook
Front panel
Piping/wiring panel
MUP1201H
MUP096H1
(12.7)
(Right piping)
MUP1441H
MUP1681H
(15.8)
MUP120H1
CAUTION
Wrap the valves at the gas and the liquid side in wet cloth to keep
it cool and prevent the heat from the torch from damaging it when
connecting the pipe to the valve on the gas and the liquid line.
D
a r
w
o -
u
f t
r o
w
a
d r
Gas
Cut the L-shaped pipe at the horizontal
straight section, then braze the socket and
1/2"
3/4"
pipe procured locally.
(19.1)
Liquid pipe
Gas pipe
1/2"
7/8"
Section to
be cut
(22.2)
Pipe
socket
Cut the L-shaped pipe at the horizontal
straight section, then braze the socket and
pipe procured locally.
1/2"
1-1/8"
(28.6)
Liquid pipe
Gas pipe
Section to
be cut
Pipe
5/8"
1-1/8"
(28.6)
socket
D
a r
w
o -
t u
d
o
w
n
w
a
d r
Cut the L-shape pipe at the vertical straight
section, then braze the socket and pipe
procured locally.
Liquid pipe
Gas pipe
Section to
be cut
Pipe
socket
Cut the L-shape pipe at the vertical straight
section, then braze the socket and pipe
procured locally.
Liquid pipe
Gas pipe
Section to
be cut
Pipe
socket
Valve at the gas side
Valve at the
liquid side
Cloth
Torch
18-EN
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