Mitsubishi Electric CITY MULTI PUHY-P72-432TNU-A Data Book page 183

12. PIPING DESIGN
Procedures for installing the branched pipes
Refer to the instructions that came with the branched pipe kit (separately sold) for details.
[1] Branches on the indoor-unit side
■Joint
To outdoor unit or heat source unit
Horizontal installation
0° or more
Vertical installation
Upward vertical
Outdoor-unit or
heat-source-unit side (main pipe)
Restrictions described here apply to the joint in the gas line.
CMY-Y202S-G2 or CMY-Y302S-G2 in the gas line must be installed horizontally (see figure above) or with the branched
pipes facing up.
If the size of the refrigerant pipe that is selected by following the instructions under "Piping Design" section does not
match the size of the joint, use a reducer to connect them. A reducer is included in the kit.
■Header
To outdoor/heat source unit
No restrictions apply to the installation of the header.
If the size of the refrigerant pipe that is selected by following the instructions under "Piping Design" section does not
match the size of the header, cut the pipe to an appropriate size using a pipe cutter, or use a reducer to connect them.
If the number of header branches exceeds the number of pipes to be connected, cap the unused header branches.
Caps are included in the kit.
[2] Branches on the outdoor/heat source-unit side
Inclination of the twinning pipes
The inclination of the twinning pipes must be ±15° or less against the horizontal plane.
Excessive inclination of the twinning pipes may damage the unit.
Minimum length of the straight section of the pipe before the twinning pipes
Always use the pipes supplied in the twinning pipe kit, and make sure the straight section of the pipe immediately
before it connects to the twinning pipe is at least 500 mm (19-11/16 in.). Failure to do so may damage the unit.
MEES23K040
Outdoor-unit or
heat-source-unit side
(main pipe)
Outdoor-unit or
heat-source-unit side (main pipe)
Note. Refer to the figure below for the installation position of the twinning pipe.
Slope of the twinning pipes are at an angle within ±15° to the horizontal plane.
To indoor unit (branched pipe)
0° or more
Downward vertical
Outdoor-unit or
heat-source-unit side (main pipe)
To indoor unit
Twinning pipe
Y-Series
Be careful on return oil.
When installing the branched pipe,
do not tilt it with the indoor unit side
facing down.
0° or more
Pipe cutter
or
Reducer
180