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SMMS Concealed Duct High Static Pressure Type
Heat insulating process
• After drain check, covering the heat insulator for drain connecting section, wrap the drain pipe with heat insulator
(Locally procured) without clearance from the end of the drain pipe connecting port of the indoor unit.
To cover the pipe and the indoor unit with
a heat insulator, do not make a space
between them.
PVC pipe
(locally procured)
Heat insulator
(locally procured)
Fix the insulator with adhesive tape
19-EN
Installation Manual
Heat insulator
(indoor unit side)
– 10 –
SMMS Concealed Duct High Static Pressure Type
7
Refrigerant Piping
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.
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 MMD-
Gas side
Liquid side
AP015 to AP018
Ø12.7
Ø6.4
AP024 to AP048
Ø15.9
Ø9.5
Connecting refrigerant piping
Flaring
1
Cut the pipe with 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.
Installation Manual
Projection margin in flaring: B (Unit: mm)
Outer dia. of
Conventional
R410A tool used
copper pipe
tool used
6.4, 9.5
0 to 0.5
1.0 to 1.5
12.7, 15.9
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
15.9
19.7
* 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
EN
20-EN
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