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Heat insulating process
• Using the attached drain hose heat insulator, lap the connecting section and the drain hose without clearance,
and then tighten with two handing band so that heat insulator does not open.
• Covering the attached drain hose heat insulator, lap the heat insulator (locally procured) to the drain pipe without
clearance.
Lap covering connecting section
Heat insulator
between drain pan and drain hose.
(locally procured)
Drain hose
Drain
pan
Hose band
Banding band
Hose band
Attached heat insulator
* Fasten the binding bands in such a manner as to not
squeeze the attached insulating material excessively.
Lap the attached
heat insulation so
that the one end is
put on the other end
at the upper side.
* Tighten the banding band so that attached
heat insulator is not pushed excessively.
– 13 –
6
Refrigerant piping
CAUTION
When the refrigerant pipe is long, provide support
brackets at intervals of 2.5 m to 3 m to clamp the
refrigerant pipe. Otherwise, abnormal sound may be
generated.
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Take out direction of
refrigerant pipe
• The refrigerant pipe connecting sections are located
as shown below. (Pipes can be taken out from one of
the three directions.)
• Make a pipe knockout hole, referring to the section
"Pipe knockout hole".
Upper
Back
Right
* When Drain Pump Kit (sold separately) is installed, a
refrigerant pipe can only be taken out from upper direction.
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Permissible piping length and
height difference
They vary depending on the outdoor unit. For details,
refer to the Installation Manual attached to the outdoor
unit.
CAUTION
IMPORTANT 4 POINTS FOR PIPING WORK
1. Reusable mechanical connectors and flared
joints are not allowed indoors. When mechanical
connectors are reused indoors, sealing parts shall
be renewed. When flared joints are reused indoors,
the flare part shall be refabricated.
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes by using
VACUUM PUMP.
4. Check the gas leakage. (Connected points)
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Pipe size
Pipe size (mm)
Model
Gas side
Liquid side
HM40, HM56
Ø12.7
Ø6.4
HM80, HM90, HM110,
Ø15.9
Ø9.5
HM140, HM160
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Connecting refrigerant piping
Flaring
• Cut the pipe with a pipe cutter.
Remove burrs completely.
Remaining burrs may cause gas leakage.
• Insert a flare nut into the pipe, and flare the pipe.
As the flaring sizes of R32 differ from those of
refrigerant R22, the flare tools newly manufactured for
R32 are recommended.
However, the conventional tools can be used by
adjusting projection margin of the copper pipe.
Projection margin in flaring: B (Unit: mm)
Outer dia. of
Conventional
Tool used
copper pipe
tool used
6.4, 9.5
0.5 to 1.1
1.0 to 1.5
12.7, 15.9
0.5 to 1.1
1.5 to 2.0
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