– 18 –
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.
Check the following contents
To cover the pipe and the hot water module with
a heat insulator, do not make a space between
them.
Heat insulator
PVC pipe
Fix the insulator with adhesive tape
Heat insulator
(locally procured)
(locally procured)
(locally procured)
Unit
Water outlet
Water inlet
Drain
To avoid water leak, wrap
some sealing tape around
the screw part.
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
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.
Projection margin in flaring: B (Unit: mm)
Flaring diameter size: A (Unit: mm)
* 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.
Model MMW-
Pipe size (mm)
Gas side
Liquid side
AP027 to AP056
Ø15.9
Ø9.5
Outer dia. of
copper pipe
R410A tool used
Conventional
tool used
6.4, 9.5
0 to 0.5
1.0 to 1.5
12.7, 15.9
Outer dia. of copper pipe
A
+0
–0.4
6.4
9.1
9.5
13.2
12.7
16.6
15.9
19.7
Work using double spanner
35-EN
36-EN
Summary of Contents for MMW-AP0271LQ-E
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