Mitsubishi Heavy Industries KXZ Series Service Manual page 148

Branching pipe set type
HEAD4-22-1G
HEAD6-180-1G
HEAD8-371-2
HEAD8-540-3
INSTALLATION PROCEDUCE
1. Please select an appropriate branching pipe set model and a pipe size by consulting with the installation manual of the indoor unit
or other relevant technical documents.
Attention
① Use a pipe conforming to a pipe size specified for indoor unit connection for the section between an indoor unit and a branching pipe.
② Use a pipe conforming to a pipe size specified for outdoor unit connection for the section between an outdoor branching pipe and an outdoor unit.
2. Cut a branching pipe set or a different diameter joint with a pipe cutter to make it fit for a selected pipe size before application.
Attention
① In cutting pipes, always use a pipe cutter. Remove burrs from a cut end when you cut a pipe. In doing so, keep a cut end downward so
that no chips or burrs may enter the pipe.
② Take utmost care so that no foreign matter such as dust or water may enter piping during installation work.
・ P lease cover all the open ends of piping until installation work is completed. Particularly, any openings in the section of piping laid
outdoors should be sealed stringently.
・ A s long as possible, avoid open ends left facing upward. Make them face either horizontally or downward.
③ A branching joint (for both gas and liquid) must always be positioned in such a way that it branches either horizontally or vertically.
・In the case of a branching pipe set (model type DIS)
Floor surface
・In the case of a outdoor unit's branching pipe set (model type DOS)
Horizontal
Floor surface
Tilt the branch pipe within ±15° to the floor surface.
Gas side
35
IDφ12.7
IDφ9.52
415
135
IDφ 15.88
IDφ9.52
545
90
IDφ15.88
IDφ12.7
IDφ9.52
710
90
IDφ15.88
IDφ12.7
IDφ9.52
710
Horizontal
Floor surface
±15°
Liquid side
375
540
665
745
Floor surface
Floor surface Floor surface
146
– –
'14 • KX-SM-221
Different diameter pipe joint
None
100 100
1 pc. 1 pc.
100
100
1 pc. 1 pc.
100 100
1 pc. 1 pc.
Use pipe cutter to cut pipes.
Cut in the middle
Floor surface
Floor surface
Vertical
Vertical