Refrigerant Piping - Toshiba MMD-AP0724H-E Installation Manual

SMMS Concealed Duct High Static Pressure Type
Check the draining
Check if the water can flow out properly during the test run. Also, check if no water leakage from the piping
connection port.
REQUIREMENT
• Do drain test even if installation of heating season.
• Pour water into the drain pan port of the air intake port gently using the kettle or hose when duct is not connected to the
drain pipe. When duct is connected to the drain pipe, remove the service plate and perform it.
Service plate
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.
Heat insulation (Locally procured)
Drain pipe connecting port
Thickness 10 mm or more
Indoor unit
19-EN
Installation Manual
Pour into the drain pan with a hose or
other materials.
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.
Use general copper pipes with a wall thickness of 0.8
mm for Ø12.7 mm, and with a wall thickness of 1.0
mm for Ø22.2 mm (half hard).
Do not use any copper pipes with a wall thickness
less than these thicknesses.
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)
Gas side Liquid side
Ø22.2 Ø12.7
• The pipe (Ø22.2 mm) at gas side is connected with
brazing.
Liquid side refrigerant pipe
connection
Flaring
1
Cut the pipe with a pipe cutter.
Remove burrs completely. (Remaining burrs may
cause gas leakage.)
– 10 –
Installation Manual
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)
Outer dia. of Conventional
R410A tool used
copper pipe tool used
12.7 0 to 0.5 1.0 to 1.5
Flaring diameter size: A (Unit: mm)
+0
Outer dia. of copper pipe A
–0.4
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.
• 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.
EN
20-EN