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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.
Liquid pipe
HP/LP gas pipe
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.
19-EN
Hook
Front panel
Piping/wiring panel
(Left
(Right
(Rear piping)
piping)
piping)
(Left piping)
(Right piping)
Drawing out
downward
Suction gas pipe
Pipe connection method of valve (Example)
[(A) Valve side piping diameter→(B)Main piping diameter]
Model name
Liquid side ([in.] mm)
HP/LP gas side ([in.] mm) Suction gas side ([in.] mm)
MMY-MUP0721F*
[1/2"]Ø12.7→[1/2"]Ø12.7
[3/4"]Ø19.1→[3/4"]Ø19.1
MMY-MUP0961F*
[1/2"]Ø12.7→[1/2"]Ø12.7
[3/4"]Ø19.1→[3/4"]Ø19.1
MMY-MUP1201F*
[5/8"]Ø15.9→[1/2"]Ø12.7* [3/4"]Ø19.1→[3/4"]Ø19.1
MMY-MUP1441F*
[5/8"]Ø15.9→[5/8"]Ø15.9
[3/4"]Ø19.1→[7/8"]Ø22.2*
MMY-MUP1681F*
[5/8"]Ø15.9→[5/8"]Ø15.9
[3/4"]Ø19.1→[7/8"]Ø22.2*
MMY-MUP1921F*
[5/8"]Ø15.9→[5/8"]Ø15.9
[3/4"]Ø19.1→[7/8"]Ø22.2*
MMY-MUP072H1F*
[1/2"]Ø12.7→[1/2"]Ø12.7
[3/4"]Ø19.1→[3/4"]Ø19.1
MMY-MUP096H1F*
[5/8"]Ø15.9→[1/2"]Ø12.7* [3/4"]Ø19.1→[3/4"]Ø19.1
MMY-MUP120H1F*
[5/8"]Ø15.9→[1/2"]Ø12.7* [3/4"]Ø19.1→[3/4"]Ø19.1
* Even when the piping connection diameter on the outdoor unit side differs from
the main piping diameter, prepare and use socket procured locally with a different
diameter.
Draw-out forward
Cut the L-shaped pipe, then braze the socket and piping
procured locally.
HP/LP gas
pipe
Suction
gas pipe
Liquid pipe
L-shaped
pipe
socket
Pipe
CAUTION
Wrap all the valves in wet cloth to keep them cool and prevent the
heat from the torch from damaging it when connecting the pipe to
all the valves.
– 10 –
[8/8"]Ø25.4→[3/4"]Ø19.1*
[8/8"]Ø25.4→[7/8"]Ø22.2*
[8/8"]Ø25.4→[1-1/8"]Ø28.6*
[8/8"]Ø25.4→[1-1/8"]Ø28.6*
[8/8"]Ø25.4→[1-1/8"]Ø28.6*
[8/8"]Ø25.4→[1-1/8"]Ø28.6*
[8/8"]Ø25.4→[3/4"]Ø19.1*
[8/8"]Ø25.4→[7/8"]Ø22.2*
[8/8"]Ø25.4→[1-1/8"]Ø28.6*
Draw-out downward
Cut the L-shaped pipe, then braze the socket and piping
procured locally.
HP/LP gas
pipe
Suction
gas pipe
Liquid pipe
L-shaped
pipe
Socket
pipe
Valve at the
Suction gas side
Valve at the HP/
LP gas side
Valve at the
liquid side
Cloth
Torch
(A)
(B)
EN
EN
ID
20-EN
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