Mitsubishi KXZ Series - Page 353

-
351
-
'20 • KX-T-373
Indoor unit (Liquid)
Installation direction
Branching pipe from
outdoor unit (Liquid)
Indoor unit
Indoor unit
EEV-SET
(Type15-56) φ6.35
※Prepare different diameter pipe joint for Type15-56
Outdoor unit
φ9.52
φ9.52
Liquid piping size
(Type71, 90) φ9.52
◦ 
Use

phosphorus deoxidized copper alloy seamless pipe (C1220T specified in JIS H

3300) for
refrigeration pipe installation.
In addition, make sure there is no damage both inside and outside of the pipe, and no harmful substances such as
sulfur, oxide, dust or contaminant stuck on the pipes.
In the case of are connection,

Please check there is no burr or scratches on the are surface.
Please check D
dimension after matching.
◦ 
When fastening the flare nut, align the refrigeration pipe with the center of flare nut, screw the
nut for 3-4 times by hand and then tighten it by spanner with the specified torque mentioned
in the table above. Make sure to hold the pipe in the indoor unit securely by a spanner when
tightening the nut in order to avoid unexpected stress on the copper pipe.
◦ 
After they are checked for a gas leak, cover the insulation and tighten both ends firmly with
the band.
◦ 
Please reinforce the insulation of refrigerant pipes in use under high humidity condition
R410A
Conventional tool
6.35 0.8 8.7-9.1
14
-
18
9.52 0.8 12.8-13.2
34
-
32
12.7 0.8 16.2-16.6
49
-
61
15.88 1 19.3-19.7
68
-
82
19.05 1.2 23.6-24.0 100-120
Flare O.D.
Ｄ
mm
Flare nut
tightening
torque
Ｎ･m
0-0.5
0.7-1.3
Pipe
diameter
d
mm
Minimum pipe
wall thickness
mm
Protruding dimension for flare mm
Rigid
（
Clitch type
）
Temperature of piping between EEV-SET and indoor unit will be lower than the other liquid piping.
We highly recommend to use piping insulation with thickness of 20mm or more.
CAUTION
Refrigerating oil should not be applied to the threads of union or external surface of flare. It is because, even if the same
tightening torque is applied, the oil is likely to decrease the slide friction force on the threads and increase, in turn, the
axial component force so that it could crack the flare by the stress corrosion.
Refrigerating machine oil may be applied to the internal surface of flare only.