Refrigerant Piping - Toshiba RAS-M07G3DV Series Installation Manual

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
Air discharge side
Attach the air intake grille and the air filter (locally procured) to the air intake side of ceiling opening
CAUTION
Incomplete heat insulation of the supply air flange and sealing may
occur dewing resulted in falling of water drop.
EN-27
Flange (locally procured)
Aluminum tape (locally procured)
Indoor unit
Air intake side
Aluminum tape (locally procured)
Under surface
7

Refrigerant piping

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
Pipe size (mm)
Model RAS-
Gas side
M07,10,13G3DV Ø9.5
M16G3DV Ø12.7
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.
– 14 –
Installation Manual
Projection margin in flaring: B (Unit: mm)
Outer dia. of R410A tool
copper pipe used
6.4, 9.5
0 to 0.5
12.7
Flaring diameter size: A (Unit: mm)
Outer dia. of copper
pipe
6.4
9.5
12.7
Liquid side
Ø6.4
Ø6.4
* 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.
Work using double spanner
Conventional
tool used
1.0 to 1.5
A +0
–0.4
9.1
13.2
16.6
EN-28