Refrigerant Piping - Toshiba MMC-AP0154H-E Installationsanleitung

Heat insulating process
• Using the attached drain hose heat insulator, lap the connecting section and the drain hose without clearance,
and then tighten with two handing band so that heat insulator does not open.
• Covering the attached drain hose heat insulator, lap the heat insulator (procured locally) to the drain pipe without
clearance.
Lap covering connecting section
between drain pan and drain hose.
Drain hose
Drain
pan
Hose band Banding band Hose band
Attached heat insulator
67-EN
Heat insulator
(procured locally)
Lap the attached
heat insulation so
that the one end is
put on the other end
at the upper side.
* Tighten the banding band so that attached
heat insulator is not pushed excessively.
6

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
Phosphor deoxidization joint-less
Piping material
pipe for air conditioner
AP015 type, AP024 type to
Model MMC-
AP018 type
Gas side Ø12.7
Pipe size
Liquid
(mm)
Ø6.4
side
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.
– 34 –
Projection margin in flaring: B (Unit: mm)
Outer diam. of
R410A tool used
copper pipe
6.4, 9.5
0 to 0.5
12.7, 15.9
Flaring diameter size: A (Unit: mm)
Outer diam. of copper pipe
6.4
9.5
12.7
15.9
AP048 type
Ø15.9
Ø9.5
* 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
+0
A
–0.4
9.1
13.2
16.6
19.7
68-EN