Refrigerant Piping - Toshiba RAV-HM301SDTY-E Installation Manual

IM_D0X7205001-01_EN.book Page 132 Friday, May 19, 2023 9:06 PM
 Connecting method of the duct
Connect a duct to the
outside of the flange. In
addition, the duct must be
covered with insulation
Duct: Insulation material
material so that the flange
(locally procured)
will not be exposed
Flange
Indoor unit
Air discharge
side
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.
47-EN
Flange (locally procured)
Aluminum tape (locally procured)
Air intake side
Aluminum tape (locally procured)
Under surface
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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 R32 flare nut.
 Permissible piping length and
height difference
They vary depending on the outdoor unit. For details,
refer to the Installation Manual R32 attached to the
outdoor unit.
 Pipe size
Outside diameter size (mm)
Model type
Gas side Liquid side
301 401 9.5 6.4
561 12.7 6.4
801 15.9 9.5
 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 R32 refrigerant. The flaring dimensions for R32
are different from the ones used for the conventional
R22 refrigerant. A new flare tool manufactured for
use with the R32 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)
Outer dia. of Conventional tool
R32 tool used
copper pipe used
6.4, 9.5
0 to 0.5 1.0 to 1.5
12.7
Flaring diameter size: A (Unit: mm)
+0
Outer dia. of copper pipe A
–0.4
6.4 9.1
9.5 13.2
12.7 16.6
* In case of flaring for R32 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.
Work using two wrenches
48-EN