Toshiba MMD-AP0071SH-C Service Manual page 41

6
AIR DUCTING
6-1. Arranging the Duct connection port
Referring to the following dimensions, manufacture duct at the local site.
Be sure to mount an air filter to the air inlet side at the local site; otherwise decrease of capacity and etc. may be
caused.
<Under air inlet>
CAUTION
Take out this cover plate.
805
12.5
12.5
100 100 100 100 100 100 100 100
825
6-2. Connecting method of the duct
Heat insulator with sticking material
(100mm-width Local supply)
Connect a duct to the
Aluminum tape
inside of the flange
(Local supply)
Flange
Duct:Insulation material
(Local supply)
Indoor unit
Air outlet side
Aluminum tape
(Local supply)
Under surface
Cover a screw
Heat insulator with sticking material (100mm-width Local supply)
<Back air inlet>
Remove the cover plate and then fix
it to the bottom surface.
805
12.5
12.5
100 100 100 100 100 100 100 100
825
Flange (Local supply)
Aluminum tape
(Local supply)
Air inlet side
CAUTION
Incomplete heat insulation of
Aluminum tape
the supply air flange and
(Local supply)
sealing may occur dewing
resulted in falling of water drop.
7
REFRIGERANT PIPING
• If refrigerant gas has leaked during the installation work, ventilate the room immediately.
• If the leaked refrigerant gas comes in contact with fire, noxious gas may generate.
• After the installation work, confirm that refrigerant gas does not leak.
• If refrigerant gas leaks into the room and flows near a fire source, such as a cooking range, noxious gas may
generate.
REQUIREMENT
When the refrigerant pipe is long, set the support brackets to fix the pipe with 2.5 to 3m intervals. If the pipe is
not fixed, abnormal sound may generate.
Be sure to use the flare nuts attached to the indoor unit or those fro R410A.
Permissible pipe length and permissible height difference
They are different according to the used outdoor unit. For details, refer to the Installation Manual attached to the
outdoor unit.
Piping material and dimensions
Piping material Phosphor deoxidization joint-less pipe for air conditioner
Model MMD-
Gas side
Pipe size (mm)
Liquid side
• Use a clean and new pipe, and check that impurity such as dust, oil, moisture, etc. does not adhere in the pipe.
Pipe forming/End positioning
Flaring
1. Cut the pipe with a pipe cutter.
OK NO GOOD
90˚
Obliquity Roughness Warp
2. Insert a flare nut into the pipe, and flare the pipe.
As the flaring sizes of R410A differ from those of
refrigerant R22, the flare tools newly manufactured
for R410A are recommended.
However, the conventional tools can be used by
adjusting projection margin of the copper pipe.
WARNING
AP007 to AP012 AP015 to AP018
Ø9.5 Ø12.7
Ø6.4 Ø6.4
A
• Flaring diam. meter size :
A (Unit : mm)
+0
A
Outer diam. of - 0.4
copper pipe
R410A
6.4 9.1
9.5 13.2
12.7 16.6
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.