– 13 –
■
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.
* 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.
Lap covering connecting section
between drain pan and drain hose.
Drain
pan
Drain hose
Hose band
Banding band
Heat insulator
(locally procured)
Hose band
Attached heat insulator
Right
Upper
Back
6 Refrigerant piping
■
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”.
* When Drain Pump Kit (sold separately) is installed, a
refrigerant pipe can only be taken out from upper direction.
■
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)
■
Pipe size
Model
Pipe size (mm)
Gas side Liquid side
HM40, HM56 Ø12.7 Ø6.4
HM80, HM90, HM110,
HM140, HM160
Ø15.9 Ø9.5
■
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
copper pipe
Tool used
Conventional
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
B
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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