Refrigerant Piping - Toshiba MMW-AP0271LQ-TR Installation Manual

 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 hot water module.
To cover the pipe and the hot water module 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
 Check the following contents
To avoid water leak, wrap
some sealing tape around
the screw part.
35-EN
Unit
Heat insulator
(locally procured)
Water outlet
Water inlet
Drain
8

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, and this manual (Refer to "3. System control of
Hot Water Module").
 Pipe size
Pipe size (mm)
Model MMW-
Gas side Liquid side
AP027 to AP056 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.
– 18 –
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
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
EN
36-EN