Refrigerant Piping - Toshiba MML-AP0074BH1-E Installationsanleitung

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
Pipe size (mm)
Model MML-
Gas side Liquid side
AP007 to AP012 Ø9.5
AP015, AP018 Ø12.7
AP024 Ø15.9
 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.
99-EN
Projection margin in flaring: B (Unit: mm)
Outer dia. 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 dia. of copper pipe
6.4
9.5
12.7
15.9
Ø6.4
Ø6.4
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
• Use the tightening torque levels as listed in the
following table.
Outer dia. of connecting
pipe (mm)
Conventional
6.4
tool used
9.5
1.0 to 1.5
12.7
15.9
• Tightening torque of flare pipe connections.
Pressure of R410A is higher than that of R22.
(Approx. 1.6 times) Therefore, using a torque
wrench, tighten the flare pipe connecting sections
which connect the indoor and outdoor units of the
specified tightening torque.
Incorrect connections may cause not only a gas leak,
but also a trouble of the refrigeration cycle.
CAUTION
+0
A
–0.4 Tightening with an excessive torque may crack the nut
depending on installation conditions.
9.1
13.2
16.6
 Airtight test / air purge, etc.
19.7
For air tightness test, adding refrigerant, refer to the
Installation Manual attached to the outdoor unit.
CAUTION
Do not supply power to the indoor unit until the airtight
test and vacuuming are completed. (If the indoor unit is
powered on, the pulse motor valve is fully closed, which
extends the time for vacuuming.)
 Open the valve fully
Open the valve of the outdoor unit fully.
– 50 –
 Heat insulation process
Apply heat insulation for the pipes separately at liquid
side and gas side.
Tightening torque (N•m)
• For the heat insulation to the pipes at gas side, use
14 to 18 (1.4 to 1.8 kgf•m)
the material with heat-resisting temperature 120 °C
33 to 42 (3.3 to 4.2 kgf•m)
or higher.
50 to 62 (5.0 to 6.2 kgf•m) • To use the attached heat insulation pipe, apply the
heat insulation to the pipe connecting section of the
63 to 77 (6.3 to 7.7 kgf•m)
indoor unit securely without gap.
REQUIREMENT
Apply the heat insulation to the pipe connecting section
of the indoor unit securely up to the root without
exposure of the pipe. (The pipe exposed to the outside
causes water leak.)
Indoor unit
Attached heat insulating pipe
Adhesive tape
Pipe side
(Locally procured)
100-EN