– 18 –
EN
Connecting method of the duct
Attach the air intake grille and the air filter (locally procured) to the air intake side of ceiling opening
CAUTION
CAUTION
Incomplete heat insulation of the supply air flange and sealing may occur dewing resulted in falling of water drop.
Connect a duct to the
outside of the flange. In
addition, the duct must be
covered with insulation
material so that the flange
will not be exposed
Duct: Insulation material
(locally procured)
Flange (locally procured)
Aluminum tape (locally procured)
Flange
Air discharge
side
Indoor unit
Air intake side
Under surface
Aluminum tape (locally procured)
7
Refrigerant piping
CAUTION
CAUTION
When the refrigerant pipe is long, provide support
brackets at intervals of 2.5 to 3 m to clamp the
refrigerant pipe. Otherwise, abnormal sound may be
generated. Use the flare nut attached with the indoor
unit or R410A flare nut.
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.
Pipe size
Connecting refrigerant piping
Flaring
1. Cut the pipe by a pipe cutter.
Remove burrs completely. (Remaining burrs may
cause gas leakage.)
2. Insert a flare nut into the pipe, and flare the pipe. Use
the flare nut provided with the unit or the one used for
the R410A refrigerant. The flaring dimensions for
R410A are different from the ones used for the
conventional R22 refrigerant. A new flare tool
manufactured for use with the R410A refrigerant is
recommended, but the conventional tool can still be
used if the projection margin of the copper pipe is
adjusted to be as shown in the following table.
Projection margin in flaring: B (Unit: mm)
Flaring diameter size: A (Unit: mm)
* In case of flaring for R410A with the conventional flare
tool, pull it out approx. 0.5 mm more than that for R22
to adjust to the specified flare size. The copper pipe
gauge is useful for adjusting projection margin size.
• The sealed gas was sealed at the atmospheric
pressure so when the flare nut is removed, there will
no “whooshing” sound: This is normal and is not
indicative of trouble.
• Use two wrenches to connect the indoor unit pipe.
Model type
Outside diameter size (mm)
Gas side
Liquid side
003-012
9.5
6.4
015-018
12.7
6.4
024-027
15.9
9.5
Outer dia. of
copper pipe
R410A tool used
Conventional tool
used
6.4, 9.5
0 to 0.5
1.0 to 1.5
12.7
Outer dia. of copper pipe
A
+0
–0.4
6.4
9.1
9.5
13.2
12.7
16.6
Work using two wrenches
35-EN
36-EN
